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1 lt1962 series 300ma, low noise, micropower ldo regulators n low noise: 20 m v rms (10hz to 100khz) n output current: 300ma n low quiescent current: 30 m a n wide input voltage range: 1.8v to 20v n low dropout voltage: 270mv n very low shutdown current: < 1 m a n no protection diodes needed n fixed output voltages: 1.5v, 1.8v, 2.5v, 3v, 3.3v, 5v n adjustable output from 1.22v to 20v n stable with 3.3 m f output capacitor n stable with aluminum, tantalum or ceramic capacitors n reverse battery protection n no reverse current n overcurrent and overtemperature protected n 8-lead msop package the lt ? 1962 series are micropower, low noise, low dropout regulators. the devices are capable of supplying 300ma of output current with a dropout voltage of 270mv. designed for use in battery-powered systems, the low 30 m a quiescent current makes them an ideal choice. quiescent current is well controlled; it does not rise in dropout as it does with many other regulators. a key feature of the lt1962 regulators is low output noise. with the addition of an external 0.01 m f bypass capacitor, output noise drops to 20 m v rms over a 10hz to 100khz bandwidth. the lt1962 regulators are stable with output capacitors as low as 3.3 m f. small ceramic capacitors can be used without the series resistance required by other regulators. internal protection circuitry includes reverse battery pro- tection, current limiting, thermal limiting and reverse cur- rent protection. the parts come in fixed output voltages of 1.5v, 1.8v, 2.5v, 3v, 3.3v and 5v, and as an adjustable device with a 1.22v reference voltage. the lt1962 regu- lators are available in the 8-lead msop package. 3.3v low noise regulator n cellular phones n battery-powered systems n noise-sensitive instrumentation systems , ltc and lt are registered trademarks of linear technology corporation. load current (ma) 0 dropout voltage (mv) 400 350 300 250 200 150 100 50 0 1962 ta02 100 200 300 50 150 250 dropout voltage features descriptio u applicatio s u typical applicatio u in shdn 0.01 f 10 f 1962 ta01 out sense v in 3.7v to 20v byp gnd lt1962-3.3 3.3v at 300ma 20 v rms noise 1 f +
2 lt1962 series parameter conditions min typ max units minimum operating voltage (lt1962) i load = 300ma (notes 4, 12) l 1.8 2.3 v regulated output voltage lt1962-1.5 v in = 2v, i load = 1ma 1.485 1.500 1.515 v (notes 4, 5) 2.5v < v in < 20v, 1ma < i load < 300ma l 1.462 1.500 1.538 v lt1962-1.8 v in = 2.3v, i load = 1ma 1.782 1.800 1.818 v 2.8v < v in < 20v, 1ma < i load < 300ma l 1.755 1.800 1.845 v lt1962-2.5 v in = 3v, i load = 1ma 2.475 2.500 2.525 v 3.5v < v in < 20v, 1ma < i load < 300ma l 2.435 2.500 2.565 v lt1962-3 v in = 3.5v, i load = 1ma 2.970 3.000 3.030 v 4v < v in < 20v, 1ma < i load < 300ma l 2.925 3.000 3.075 v lt1962-3.3 v in = 3.8v, i load = 1ma 3.267 3.300 3.333 v 4.3v < v in < 20v, 1ma < i load < 300ma l 3.220 3.300 3.380 v lt1962-5 v in = 5.5v, i load = 1ma 4.950 5.000 5.050 v 6v < v in < 20v, 1ma < i load < 300ma l 4.875 5.000 5.125 v adj pin voltage lt1962 v in = 2v, i load = 1ma 1.208 1.220 1.232 v (notes 4, 5) 2.3v < v in < 20v, 1ma < i load < 300ma l 1.190 1.220 1.250 v line regulation lt1962-1.5 d v in = 2v to 20v, i load = 1ma l 15 mv lt1962-1.8 d v in = 2.3v to 20v, i load = 1ma l 15 mv lt1962-2.5 d v in = 3v to 20v, i load = 1ma l 15 mv lt1962-3 d v in = 3.5v to 20v, i load = 1ma l 15 mv lt1962-3.3 d v in = 3.8v to 20v, i load = 1ma l 15 mv lt1962-5 d v in = 5.5v to 20v, i load = 1ma l 15 mv lt1962 (note 4) d v in = 2v to 20v, i load = 1ma l 15 mv load regulation lt1962-1.5 v in = 2.5v, d i load = 1ma to 300ma 3 8 mv v in = 2.5v, d i load = 1ma to 300ma l 15 mv lt1962-1.8 v in = 2.8v, d i load = 1ma to 300ma 4 9 mv v in = 2.8v, d i load = 1ma to 300ma l 18 mv (note 1) in pin voltage ........................................................ 20v out pin voltage .................................................... 20v input to output differential voltage (note 2) ......... 20v sense pin voltage ............................................... 20v adj pin voltage ...................................................... 7v byp pin voltage .................................................... 0.6v shdn pin voltage ................................................. 20v output short-circuit duration ......................... indefinite operating junction temperature range (note 3) ............................................ C 40 c to 125 c storage temperature range ................. C 65 c to 150 c lead temperature (soldering, 10 sec).................. 300 c absolute axi u rati gs w ww u the l denotes specifications which apply over the full operating temperature range, otherwise specifications are t a = 25 c. (note 3) electrical characteristics order part number lt1962ems8 lt1962ems8-1.5 lt1962ems8-1.8 lt1962ems8-2.5 lt1962ems8-3 lt1962ems8-3.3 lt1962ems8-5 ms8 part marking ltml ltsz ltta ltpt t jmax = 150 c, q ja = 125 c/ w see the applications information section for additional information on thermal resistance *pin 2: sense for lt1962-1.5/lt1962-1.8/ lt1962-2.5/lt1962-3/lt1962-3.3/lt1962-5. adj for lt1962 1 2 3 4 out sense/adj* byp gnd 8 7 6 5 in nc nc shdn top view ms8 package 8-lead plastic msop package/order i for atio uu w ltpq ltps ltpr consult factory for parts specified with wider operating temperature ranges.
3 lt1962 series load regulation lt1962-2.5 v in = 3.5v, d i load = 1ma to 300ma 5 12 mv v in = 3.5v, d i load = 1ma to 300ma l 25 mv lt1962-3 v in = 4v, d i load = 1ma to 300ma 7 15 mv v in = 4v, d i load = 1ma to 300ma l 30 mv lt1962-3.3 v in = 4.3v, d i load = 1ma to 300ma 7 17 mv v in = 4.3v, d i load = 1ma to 300ma l 33 mv lt1962-5 v in = 6v, d i load = 1ma to 300ma 12 25 mv v in = 6v, d i load = 1ma to 300ma l 50 mv lt1962 (note 4) v in = 2.3v, d i load = 1ma to 300ma 2 6 mv v in = 2.3v, d i load = 1ma to 300ma l 12 mv dropout voltage i load = 10ma 0.10 0.15 v v in = v out(nominal) i load = 10ma l 0.21 v (notes 6, 7, 12) i load = 50ma 0.15 0.20 v i load = 50ma l 0.28 v i load = 100ma 0.18 0.24 v i load = 100ma l 0.33 v i load = 300ma 0.27 0.33 v i load = 300ma l 0.43 v gnd pin current i load = 0ma l 30 75 m a v in = v out(nominal) i load = 1ma l 65 120 m a (notes 6, 8) i load = 50ma l 1.1 1.6 ma i load = 100ma l 23 ma i load = 300ma l 812 ma output voltage noise c out = 10 m f, c byp = 0.01 m f, i load = 300ma, bw = 10hz to 100khz 20 m v rms adj pin bias current (notes 4, 9) 30 100 na shutdown threshold v out = off to on l 0.8 2 v v out = on to off l 0.25 0.65 v shdn pin current v shdn = 0v 0.01 0.5 m a (note 10) v shdn = 20v 1 5 m a quiescent current in shutdown v in = 6v, v shdn = 0v 0.1 1 m a ripple rejection v in C v out = 1.5v (avg), v ripple = 0.5v p-p , f ripple = 120hz, 55 65 db i load = 300ma current limit v in = 7v, v out = 0v 700 ma v in = v out(nominal) + 1v, d v out = C 0.1v l 320 ma input reverse leakage current v in = C 20v, v out = 0v l 1ma reverse output current lt1962-1.5 v out = 1.5v, v in < 1.5v 10 20 m a (note 11) lt1962-1.8 v out = 1.8v, v in < 1.8v 10 20 m a lt1962-2.5 v out = 2.5v, v in < 2.5v 10 20 m a lt1962-3 v out = 3v, v in < 3v 10 20 m a lt1962-3.3 v out = 3.3v, v in < 3.3v 10 20 m a lt1962-5 v out = 5v, v in < 5v 10 20 m a lt1962 (note 4) v out = 1.22v, v in < 1.22v 5 10 m a parameter conditions min typ max units the l denotes specifications which apply over the full operating temperature range, otherwise specifications are t a = 25 c. (note 3) electrical characteristics note 1: absolute maximum ratings are those values beyond which the life of a device may be impaired. note 2: absolute maximum input to output differential voltage cannot be achieved with all combinations of rated in pin and out pin voltages. with the in pin at 20v, the out pin may not be pulled below 0v. the total measured voltage from in to out can not exceed 20v. note 3: the lt1962 regulators are tested and specified under pulse load conditions such that t j ? t a . the lt1962 is 100% tested at t a = 25 c. performance at C 40 c and 125 c is assured by design, characterization and correlation with statistical process controls. note 4: the lt1962 (adjustable version) is tested and specified for these conditions with the adj pin connected to the out pin.
4 lt1962 series typical perfor a ce characteristics uw output current (ma) 0 dropout voltage (mv) 150 200 250 150 250 1962 g01 100 50 0 50 100 200 300 350 400 300 t j = 125 c t j = 25 c output current (ma) 0 0 guaranteed dropout voltage (mv) 100 200 300 50 100 150 200 1962 g02 250 400 500 50 150 250 350 450 300 = test points t j 125 c t j 25 c temperature ( c) ?0 dropout votlage (mv) 350 25 1962 g03 200 100 ?5 0 50 50 0 400 300 250 150 75 100 125 i l = 300ma i l = 100ma i l = 50ma i l = 10ma i l = 1ma typical dropout voltage guaranteed dropout voltage dropout voltage quiescent current temperature ( c) ?0 0 quiescent current ( a) 5 15 20 25 50 35 0 50 75 1962 g04 10 40 45 30 ?5 25 100 125 v in = 6v v shdn = v in r l = , i l = 0 (lt1962-1.5/-1.8 /2.5/-3/-3.3/-5) r l = 250k, i l = 5 a (lt1962) note 5: operating conditions are limited by maximum junction temperature. the regulated output voltage specification will not apply for all possible combinations of input voltage and output current. when operating at maximum input voltage, the output current range must be limited. when operating at maximum output current, the input voltage range must be limited. note 6: to satisfy requirements for minimum input voltage, the lt1962 (adjustable version) is tested and specified for these conditions with an external resistor divider (two 250k resistors) for an output voltage of 2.44v. the external resistor divider will add a 5 m a dc load on the output. note 7: dropout voltage is the minimum input to output voltage differential needed to maintain regulation at a specified output current. in dropout, the output voltage will be equal to: v in C v dropout . note 8: gnd pin current is tested with v in = v out(nominal) or v in = 2.3v (whichever is greater) and a current source load. this means the device is electrical characteristics tested while operating in its dropout region. this is the worst-case gnd pin current. the gnd pin current will decrease slightly at higher input voltages. note 9: adj pin bias current flows into the adj pin. note 10: shdn pin current flows into the shdn pin. this current is included in the specification for gnd pin current. note 11: reverse output current is tested with the in pin grounded and the out pin forced to the rated output voltage. this current flows into the out pin and out the gnd pin. note 12: for the lt1962, lt1962-1.5 and lt1962-1.8 dropout voltage will be limited by the minimum input voltage specification under some output voltage/load conditions. see the curve of minimum input voltage in the typical performance characteristics. for other fixed voltage versions of the lt1962, the minimum input voltage is limited by the dropout voltage. lt1962-1.5 output voltage lt1962-1.8 output voltage temperature ( c) ?0 output voltage (v) 125 1962 g05 0 50 100 ?5 25 75 1.532 1.524 1.516 1.508 1.500 1.492 1.484 1.476 1.468 i l = 1ma temperature ( c) ?0 output voltage (v) 125 1962 g06 0 50 100 ?5 25 75 1.836 1.827 1.818 1.809 1.800 1.791 1.782 1.773 1.764 i l = 1ma
5 lt1962 series typical perfor a ce characteristics uw lt1962-3 quiescent current lt1962-3.3 output voltage lt1962-5 output voltage lt1962 adj pin voltage lt1962-2.5 output voltage lt1962-3 output voltage temperature ( c) ?0 output votlage (v) 2.53 25 1962 g07 2.50 2.48 ?5 0 50 2.47 2.46 2.54 2.52 2.51 2.49 75 100 125 i l = 1ma temperature ( c) ?0 output votlage (v) 3.045 25 1962 g08 3.000 2.970 ?5 0 50 2.955 2.940 3.060 3.030 3.015 2.985 75 100 125 i l = 1ma temperature ( c) ?0 output votlage (v) 5.075 25 1962 g10 5.000 4.950 ?5 0 50 4.925 4.900 5.100 5.050 5.025 4.975 75 100 125 i l = 1ma temperature ( c) ?0 adj pin votlage (v) 1.235 25 1962 g11 1.220 1.210 ?5 0 50 1.205 1.200 1.240 1.230 1.225 1.215 75 100 125 i l = 1ma lt1962-1.5 quiescent current input voltage (v) 0 quiescent current ( a) 800 700 600 500 400 300 200 100 0 8 1962 g12 246 10 7 135 9 t j = 25 c r l = v shdn = v in v shdn = 0v lt1962-2.5 quiescent current lt1962-1.8 quiescent current input voltage (v) 0 quiescent current ( a) 800 700 600 500 400 300 200 100 0 8 1962 g13 246 10 7 135 9 t j = 25 c r l = v shdn = v in v shdn = 0v input voltage (v) 0 quiescent current ( a) 800 700 600 500 400 300 200 100 0 8 1962 g14 246 10 7 135 9 t j = 25 c r l = v shdn = v in v shdn = 0v input voltage (v) 0 quiescent current ( a) 800 700 600 500 400 300 200 100 0 8 1962 g15 246 10 7 135 9 t j = 25 c r l = v shdn = v in v shdn = 0v temperature ( c) ?0 output votlage (v) 3.345 25 1962 g09 3.300 3.270 ?5 0 50 3.255 3.240 3.360 3.330 3.315 3.285 75 100 125 i l = 1ma
6 lt1962 series typical perfor a ce characteristics uw lt1962-3.3 quiescent current lt1962-5 quiescent current lt1962 quiescent current lt1962-1.5 gnd pin current lt1962-1.8 gnd pin current input voltage (v) 0 quiescent current ( a) 800 700 600 500 400 300 200 100 0 8 1962 g16 246 10 7 135 9 t j = 25 c r l = v shdn = v in v shdn = 0v input voltage (v) 0 quiescent current ( a) 800 700 600 500 400 300 200 100 0 8 1962 g17 246 10 7 135 9 t j = 25 c r l = v shdn = v in v shdn = 0v input voltage (v) 0 quiescent current ( m a) 40 35 30 25 20 15 10 5 0 16 1962 g18 4 8 12 20 14 2 6 10 18 t j = 25 c r l = 250k v shdn = v in v shdn = 0v lt1962-3 gnd pin current lt1962-3.3 gnd pin current input voltage (v) 0 gnd pin current ( a) 500 1000 1500 250 750 1250 2468 1962 g19 10 1 03579 t j = 25 c v in = v shdn *for v out = 1.5v r l = 30 i l = 50ma* r l = 150 i l = 10ma* r l = 1.5k i l = 1ma* input voltage (v) 0 gnd pin current ( a) 500 1000 1500 250 750 1250 2468 1962 g20 10 1 03579 t j = 25 c v in = v shdn *for v out = 1.8v r l = 36 i l = 50ma* r l = 180 i l = 10ma* r l = 1.8k i l = 1ma* input voltage (v) 0 gnd pin current ( a) 500 1000 1500 250 750 1250 2468 1962 g21 10 1 03579 t j = 25 c v in = v shdn *for v out = 2.5v r l = 50 i l = 50ma* r l = 250 i l = 10ma* r l = 2.5k i l = 1ma* input voltage (v) 0 gnd pin current ( a) 500 1000 1500 250 750 1250 2468 1962 g22 10 1 03579 t j = 25 c v in = v shdn *for v out = 3v r l = 60 i l = 50ma* r l = 300 i l = 10ma* r l = 3k i l = 1ma* input voltage (v) 0 gnd pin current ( a) 500 1000 1500 250 750 1250 2468 1962 g23 10 1 03579 t j = 25 c v in = v shdn *for v out = 3.3v r l = 66 i l = 50ma* r l = 330 i l = 10ma* r l = 3.3k i l = 1ma* lt1962-2.5 gnd pin current lt1962-5 gnd pin current input voltage (v) 0 gnd pin current ( a) 500 1000 1500 250 750 1250 2468 1962 g24 10 1 03579 t j = 25 c v in = v shdn *for v out = 5v r l = 100 i l = 50ma* r l = 500 i l = 10ma* r l = 5k i l = 1ma*
7 lt1962 series typical perfor a ce characteristics uw lt1962-1.5 gnd pin current lt1962-3 gnd pin current lt1962-2.5 gnd pin current lt1962-1.8 gnd pin current input voltage (v) 0 gnd pin current (ma) 8 7 6 5 4 3 2 1 0 8 1962 g26 246 10 7 135 9 t j = 25 c v in = v shdn *for v out = 1.5v r l = 5 i l = 300ma* r l = 7.5 i l = 200ma* r l = 15 i l = 100ma* input voltage (v) 0 gnd pin current (ma) 8 7 6 5 4 3 2 1 0 8 1962 g27 246 10 7 135 9 t j = 25 c v in = v shdn *for v out = 1.8v r l = 6 i l = 300ma* r l = 9 i l = 200ma* r l = 18 i l = 100ma* gnd pin current vs i load lt1962 gnd pin current lt1962-3.3 gnd pin current lt1962-5 gnd pin current input voltage (v) 0 gnd pin current (ma) 8 7 6 5 4 3 2 1 0 8 1962 g28 246 10 7 135 9 t j = 25 c v in = v shdn *for v out = 2.5v r l = 8.33 i l = 300ma* r l = 12.5 i l = 200ma* r l = 25 i l = 100ma* input voltage (v) 0 gnd pin current (ma) 8 7 6 5 4 3 2 1 0 8 1962 g29 246 10 7 135 9 t j = 25 c v in = v shdn *for v out = 3v r l = 10 i l = 300ma* r l = 15 i l = 200ma* r l = 30 i l = 100ma* input voltage (v) 0 gnd pin current (ma) 8 7 6 5 4 3 2 1 0 8 1962 g30 246 10 7 135 9 t j = 25 c v in = v shdn *for v out = 3.3v r l = 11 i l = 300ma* r l = 16.5 i l = 200ma* r l = 33 i l = 100ma* input voltage (v) 0 gnd pin current (ma) 8 7 6 5 4 3 2 1 0 8 1962 g31 246 10 7 135 9 t j = 25 c v in = v shdn *for v out = 5v r l = 16.7 i l = 300ma* r l = 25 i l = 200ma* r l = 50 i l = 100ma* input voltage (v) 0 gnd pin current (ma) 8 7 6 5 4 3 2 1 0 8 1962 g32 246 10 7 135 9 t j = 25 c v in = v shdn *for v out = 1.22v r l = 4.07 i l = 300ma* r l = 6.1 i l = 200ma* r l = 12.2 i l = 100ma* output current (ma) 0 gnd pin current (ma) 3 4 5 150 250 1962 g33 2 1 0 50 100 200 6 7 8 300 v in = v out(nominal) + 1v lt1962 gnd pin current input voltage (v) 0 gnd pin current ( a) 500 1000 1500 250 750 1250 2468 1962 g25 10 1 03579 t j = 25 c v in = v shdn *for v out = 1.22v r l = 24.4 i l = 50ma* r l = 122 i l = 10ma* r l = 1.22k i l = 1ma*
8 lt1962 series shdn pin threshold (on-to-off) temperature ( c) ?0 0 shdn pin threshold (v) 0.1 0.3 0.4 0.5 1.0 0.7 0 50 75 1962 g34 0.2 0.8 0.9 0.6 ?5 25 100 125 i l = 1ma shdn pin input current adj pin bias current current limit shdn pin input current shdn pin threshold (off-to-on) current limit typical perfor a ce characteristics uw temperature ( c) ?0 0 shdn pin threshold (v) 0.1 0.3 0.4 0.5 1.0 0.7 0 50 75 1962 g35 0.2 0.8 0.9 0.6 ?5 25 100 125 i l = 1ma i l = 300ma shdn pin voltage (v) 0 0 shdn pin input current ( a) 0.2 0.6 0.8 1.0 1.4 1 5 7 1962 g36 0.4 1.2 4 9 10 2 3 68 temperature ( c) ?0 shdn pin input current ( a) 1.4 25 1962 g37 0.8 0.4 ?5 0 50 0.2 0 1.6 1.2 1.0 0.6 75 100 125 v shdn = 20v temperature ( c) ?0 20 25 35 25 75 1962 g38 15 10 ?5 0 50 100 125 5 0 30 adj pin bias current (na) input voltage (v) 0 0 current limit (a) 0.1 0.3 0.4 0.5 1.0 0.7 2 4 5 1962 g39 0.2 0.8 0.9 0.6 1 3 6 7 v out = 0v temperature ( c) ?0 current limit (a) 0.8 1.0 1.2 25 75 1962 g40 0.6 0.4 ?5 0 50 100 125 0.2 0 v in = 7v v out = 0v output voltage (v) 01 reverse output current ( a) 30 40 50 60 70 80 90 100 89 7 1962 f07 20 10 0 23 4 6 5 10 lt1962 lt1962-5 t j = 25 c v in = 0v current flows into output pin v out = v adj (lt1962) lt1962-1.5 lt1962-1.8 lt1962-2.5 lt1962-3 lt1962-3.3 reverse output current reverse output current temperature ( c) ?0 reverse output current ( a) 20 25 30 25 75 1962 g42 15 10 ?5 0 50 100 125 5 0 v in = 0v v out = 1.22v (lt1962) v out = 1.5v (lt1962-1.5) v out = 1.8v (lt1962-1.8) v out = 2.5v (lt1962-2.5) v out = 3v (lt1962-3) v out = 3.3v (lt1962-3.3) v out = 5v (lt1962-5) lt1962 lt1962-1.5/-1.8/-2.5/-3/-3.3/-5
9 lt1962 series typical perfor a ce characteristics uw ripple rejection load regulation output noise spectral density output noise spectral density rms output noise vs bypass capacitor lt1962 minimum input voltage input ripple rejection input ripple rejection frequency (hz) 20 ripple rejection (db) 30 50 70 80 10 1k 10k 1m 1962 g43 10 100 100k 60 40 0 i l = 300ma v in = v out(nominal) + 1v + 50mv rms ripple c byp = 0 c out = 10 f c out = 3.3 f frequency (hz) 20 ripple rejection (db) 30 50 70 80 10 1k 10k 1m 1962 g44 10 100 100k 60 40 0 i l = 300ma v in = v out(nominal) + 1v + 50mv rms ripple c out = 10 f c byp = 0.01 f c byp = 1000pf c byp = 100pf temperature ( c) ?0 ripple rejection (db) 66 25 1962 g45 60 56 ?5 0 50 54 52 68 64 62 58 75 100 125 i l = 300ma v in = v out(nominal) + 1v + 0.5v p-p ripple at f = 120hz temperature ( c) ?0 0 minimum input voltage (v) 0.25 0.75 1.00 1.25 2.50 1.75 0 50 75 1962 g46 0.50 2.00 2.25 1.50 ?5 25 100 125 v out = 1.22v i l = 300ma i l = 1ma temperature ( c) ?0 load regulation (mv) ? 0 5 25 75 1962 g47 ?0 ?5 ?5 0 50 100 125 ?0 ?5 lt1962 lt1962-2.5 lt1962-1.8 lt1962-1.5 v in = v out(nominal) + 1v ? i l = 1ma to 300ma lt1962-3 lt1962-3.3 lt1962-5 frequency (hz) 0.1 output noise spectrial density ( v/ hz) 1 10 1k 10k 100k 1962 g48 0.01 100 10 lt1962 lt1962-2.5 lt1962-1.5 lt1962-5 lt1962-3.3 i l = 300ma c out = 10 f c byp = 0 lt1962-3 lt1962-1.8 frequency (hz) 0.1 output noise spectral density ( v/ hz) 1 10 1k 10k 100k 1962 g49 0.01 100 10 lt1962-5 lt1962 i l = 300ma c out = 10 f c byp = 0.01 f c byp = 100pf c byp = 1000pf c byp (pf) 10 80 output noise ( v rms ) 120 160 100 1k 10k 1962 g50 40 60 100 140 20 0 i l = 300ma c out = 10 f f = 10hz to 100khz lt1962-5 lt1962-3.3 lt1962-3 lt1962 lt1962-2.5 lt1962-1.8 lt1962-1.5 rms output noise vs load current (10hz to 100khz) load current (ma) 40 output noise ( v rms ) 60 100 140 160 0.01 1 10 1000 1962 g51 20 0.1 100 120 80 0 c out = 10 f c byp = 0 f c byp = 0.01 f lt1962-5 lt1962-5 lt1962 lt1962
10 lt1962 series typical perfor a ce characteristics uw lt1962-5 10hz to 100khz output noise (c byp = 1000pf) v out 100 m v/div c out = 10 m f 1ms/div 1962 g54 i l = 300ma lt1962-5 10hz to 100khz output noise (c byp = 0.01 m f) v out 100 m v/div c out = 10 m f 1ms/div 1962 g55 i l = 300ma lt1962-5 transient response time (ms) 0 output voltage deviation (v) load current (ma) 0 0.2 0.4 1.6 1962 g56 0.2 0.4 0 100 200 300 0.4 0.2 0.6 0.8 1.2 1.8 1.4 1.0 2.0 v in = 6v c in = 10 f c out = 10 f c byp = 0 lt1962-5 transient response time ( s) 0 output voltage deviation (mv) load current (ma) 0 0.05 0.10 400 1962 g57 0.05 0.10 0 100 200 300 100 50 150 200 300 450 350 250 500 v in = 6v c in = 10 f c out = 10 f c byp = 0.01 f lt1962-5 10hz to 100khz output noise (c byp = 0) v out 100 m v/div c out = 10 m f 1ms/div 1962 g52 i l = 300ma lt1962-5 10hz to 100khz output noise (c byp = 100pf) v out 100 m v/div c out = 10 m f 1ms/div 1962 g53 i l = 300ma uu u pi fu ctio s out (pin 1): output. the output supplies power to the load. a minimum output capacitor of 3.3 m f is required to prevent oscillations. larger output capacitors will be required for applications with large transient loads to limit peak voltage transients. see the applications information section for more information on output capacitance and reverse output characteristics. sense (pin 2): sense. for fixed voltage versions of the lt1962 (lt1962-1.5/lt1962-1.8/lt1962-2.5/lt1962-3/ lt1962-3.3/lt1962-5), the sense pin is the input to the error amplifier. optimum regulation will be obtained at the point where the sense pin is connected to the out pin of the regulator. in critical applications, small voltage drops are caused by the resistance (r p ) of pc traces between the regulator and the load. these may be eliminated by con- necting the sense pin to the output at the load as shown in figure 1 (kelvin sense connection). note that the voltage drop across the external pc traces will add to the dropout voltage of the regulator. the sense pin bias current is 10 m a at the nominal rated output voltage. the sense pin can be pulled below ground (as in a dual supply system where the regulator load is returned to a negative supply) and still allow the device to start and operate. adj (pin 2): adjust. for the adjustable lt1962, this is the input to the error amplifier. this pin is internally clamped to 7v. it has a bias current of 30na which flows into the
11 lt1962 series figure 1. kelvin sense connection in shdn 1962 f01 r p out v in sense gnd lt1962 r p 4 2 1 5 8 + + load uu u pi fu ctio s pin. the adj pin voltage is 1.22v referenced to ground and the output voltage range is 1.22v to 20v. byp (pin 3): bypass. the byp pin is used to bypass the reference of the lt1962 to achieve low noise performance from the regulator. the byp pin is clamped internally to 0.6v (one v be ). a small capacitor from the output to this pin will bypass the reference to lower the output voltage noise. a maximum value of 0.01 m f can be used for reducing output voltage noise to a typical 20 m v rms over a 10hz to 100khz bandwidth. if not used, this pin must be left unconnected. gnd (pin 4): ground. shdn (pin 5): shutdown. the shdn pin is used to put the lt1962 regulators into a low power shutdown state. the output will be off when the shdn pin is pulled low. the shdn pin can be driven either by 5v logic or open- collector logic with a pull-up resistor. the pull-up resistor is required to supply the pull-up current of the open- collector gate, normally several microamperes, and the shdn pin current, typically 1 m a. if unused, the shdn pin must be connected to v in . the device will not function if the shdn pin is not connected. nc (pins 6, 7): no connect. these pins are not internally connected. for improved power handling capabilities, these pins can be connected to the pc board. in (pin 8): input. power is supplied to the device through the in pin. a bypass capacitor is required on this pin if the device is more than six inches away from the main input filter capacitor. in general, the output impedance of a battery rises with frequency, so it is advisable to include a bypass capacitor in battery-powered circuits. a bypass capacitor in the range of 1 m f to 10 m f is sufficient. the lt1962 regulators are designed to withstand reverse voltages on the in pin with respect to ground and the out pin. in the case of a reverse input, which can happen if a battery is plugged in backwards, the device will act as if there is a diode in series with its input. there will be no reverse current flow into the regulator and no reverse voltage will appear at the load. the device will protect both itself and the load. applicatio s i for atio wu uu the lt1962 series are 300ma low dropout regulators with micropower quiescent current and shutdown. the devices are capable of supplying 300ma at a dropout voltage of 300mv. output voltage noise can be lowered to 20 m v rms over a 10hz to 100khz bandwidth with the addition of a 0.01 m f reference bypass capacitor. additionally, the refer- ence bypass capacitor will improve transient response of the regulator, lowering the settling time for transient load conditions. the low operating quiescent current (30 m a) drops to less than 1 m a in shutdown. in addition to the low quiescent current, the lt1962 regulators incorporate sev- eral protection features which make them ideal for use in battery-powered systems. the devices are protected against both reverse input and reverse output voltages. in battery backup applications where the output can be held up by a backup battery when the input is pulled to ground, the lt1962-x acts like it has a diode in series with its output and prevents reverse current flow. additionally, in dual supply applications where the regulator load is re- turned to a negative supply, the output can be pulled below ground by as much as 20v and still allow the device to start and operate. adjustable operation the adjustable version of the lt1962 has an output voltage range of 1.22v to 20v. the output voltage is set by the ratio of two external resistors as shown in figure 2. the device servos the output to maintain the adj pin voltage at 1.22v referenced to ground. the current in r1 is then equal to 1.22v/r1 and the current in r2 is the current in r1
12 lt1962 series figure 2. adjustable operation (see lt1962-5 transient response in the typical perfor- mance characteristics). however, regulator start-up time is inversely proportional to the size of the bypass capaci- tor, slowing to 15ms with a 0.01 m f bypass capacitor and 10 m f output capacitor. output capacitance and transient response the lt1962 regulators are designed to be stable with a wide range of output capacitors. the esr of the output capacitor affects stability, most notably with small capaci- tors. a minimum output capacitor of 3.3 m f with an esr of 3 w or less is recommended to prevent oscillations. the lt1962-x is a micropower device and output transient response will be a function of output capacitance. larger values of output capacitance decrease the peak deviations and provide improved transient response for larger load current changes. bypass capacitors, used to decouple individual components powered by the lt1962, will in- crease the effective output capacitor value. with larger capacitors used to bypass the reference (for low noise operation), larger values of output capacitance are needed. for 100pf of bypass capacitance, 4.7 m f of output capaci- tor is recommended. with a 1000pf bypass capacitor or larger, a 6.8 m f output capacitor is recommended. the shaded region of figure 3 defines the range over which the lt1962 regulators are stable. the minimum esr needed is defined by the amount of bypass capacitance used, while the maximum esr is 3 w . extra consideration must be given to the use of ceramic capacitors. ceramic capacitors are manufactured with a variety of dielectrics, each with different behavior across in 1962 f02 r2 out v in v out adj gnd lt1962 r1 + vv r r ir vv ina out adj adj adj =+ ? ? ? ? + ()() = = 122 1 2 1 2 122 30 . . at 25 c output range = 1.22v to 20v applicatio s i for atio wu uu plus the adj pin bias current. the adj pin bias current, 30na at 25 c, flows through r2 into the adj pin. the output voltage can be calculated using the formula in figure 2. the value of r1 should be no greater than 250k to minimize errors in the output voltage caused by the adj pin bias current. note that in shutdown the output is turned off and the divider current will be zero. the adjustable device is tested and specified with the adj pin tied to the out pin for an output voltage of 1.22v. specifications for output voltages greater than 1.22v will be proportional to the ratio of the desired output voltage to 1.22v: v out /1.22v. for example, load regulation for an output current change of 1ma to 300ma is C 2mv typical at v out = 1.22v. at v out = 12v, load regulation is: (12v/1.22v)(C2mv) = C 19.7mv bypass capacitance and low noise performance the lt1962 regulators may be used with the addition of a bypass capacitor from v out to the byp pin to lower output voltage noise. a good quality low leakage capacitor is recommended. this capacitor will bypass the reference of the regulator, providing a low frequency noise pole. the noise pole provided by this bypass capacitor will lower the output voltage noise to as low as 20 m v rms with the addition of a 0.01 m f bypass capacitor. using a bypass capacitor has the added benefit of improving transient response. with no bypass capacitor and a 10 m f output capacitor, a 10ma to 300ma load step will settle to within 1% of its final value in less than 100 m s. with the addition of a 0.01 m f bypass capacitor, the output will settle to within 1% for a 10ma to 300ma load step in less than 10 m s, with total output voltage deviation of less than 2% output capacitance ( f) 1 esr ( ) 4.0 3.5 3.0 2.5 2.0 1.5 1.0 0.5 0 310 1962 f03 245 6 78 9 stable region c byp = 330pf c byp 3 1000pf c byp = 100pf c byp = 0 figure 3. stability
13 lt1962 series temperature and applied voltage. the most common dielectrics used are z5u, y5v, x5r and x7r. the z5u and y5v dielectrics are good for providing high capacitance in a small package, but exhibit strong voltage and tempera- ture coefficients as shown in figures 4 and 5. when used with a 5v regulator, a 10 m f y5v capacitor can exhibit an effective value as low as 1 m f to 2 m f over the operating temperature range. the x5r and x7r dielectrics result in more stable characteristics and are more suitable for use as the output capacitor. the x7r type has better stability across temperature, while the x5r is less expensive and is available in higher values. voltage and temperature coefficients are not the only sources of problems. some ceramic capacitors have a piezoelectric response. a piezoelectric device generates voltage across its terminals due to mechanical stress, similar to the way a piezoelectric accelerometer or micro- figure 5. ceramic capacitor temperature characteristics figure 4. ceramic capacitor dc bias characteristics dc bias voltage (v) change in value (%) 1962 f04 20 0 ?0 ?0 ?0 ?0 100 0 4 8 10 26 12 14 x5r y5v 16 both capacitors are 16v, 1210 case size, 10 f temperature ( c) ?0 40 20 0 ?0 ?0 ?0 ?0 100 25 75 1962 f05 ?5 0 50 100 125 y5v change in value (%) x5r both capacitors are 16v, 1210 case size, 10 f applicatio s i for atio wu uu phone works. for a ceramic capacitor the stress can be induced by vibrations in the system or thermal transients. the resulting voltages produced can cause appreciable amounts of noise, especially when a ceramic capacitor is used for noise bypassing. a ceramic capacitor produced figure 6s trace in response to light tapping from a pencil. similar vibration induced behavior can masquerade as increased output voltage noise. figure 6. noise resulting from tapping on a ceramic capacitor lt1962-5 c out = 10 m f c byp = 0.01 m f i load = 100ma v out 500 m v/div 100ms/div 1962 f06 thermal considerations the power handling capability of the device will be limited by the maximum rated junction temperature (125 c). the power dissipated by the device will be made up of two components: 1. output current multiplied by the input/output voltage differential: (i out )(v in C v out ), and 2. gnd pin current multiplied by the input voltage: (i gnd )(v in ). the gnd pin current can be found by examining the gnd pin current curves in the typical performance character- istics. power dissipation will be equal to the sum of the two components listed above. the lt1962 series regulators have internal thermal limit- ing designed to protect the device during overload condi- tions. for continuous normal conditions, the maximum junction temperature rating of 125 c must not be exceeded. it is important to give careful consideration to all sources of thermal resistance from junction to ambient. additional heat sources mounted nearby must also be considered.
14 lt1962 series t jmax = 50 c + 35.3 c = 85.3 c protection features the lt1962 regulators incorporate several protection features which make them ideal for use in battery-powered circuits. in addition to the normal protection features associated with monolithic regulators, such as current limiting and thermal limiting, the devices are protected against reverse input voltages, reverse output voltages and reverse voltages from output to input. current limit protection and thermal overload protection are intended to protect the device against current overload conditions at the output of the device. for normal opera- tion, the junction temperature should not exceed 125 c. the input of the device will withstand reverse voltages of 20v. current flow into the device will be limited to less than 1ma (typically less than 100 m a) and no negative voltage will appear at the output. the device will protect both itself and the load. this provides protection against batteries which can be plugged in backward. the output of the lt1962 can be pulled below ground without damaging the device. if the input is left open circuit or grounded, the output can be pulled below ground by 20v. for fixed voltage versions, the output will act like a large resistor, typically 500k or higher, limiting current flow to less than 40 m a. for adjustable versions, the output will act like an open circuit; no current will flow out of the pin. if the input is powered by a voltage source, the output will source the short-circuit current of the device and will protect itself by thermal limiting. in this case, grounding the shdn pin will turn off the device and stop the output from sourcing the short-circuit current. the adj pin of the adjustable device can be pulled above or below ground by as much as 7v without damaging the device. if the input is left open circuit or grounded, the adj pin will act like an open circuit when pulled below ground and like a large resistor (typically 100k) in series with a diode when pulled above ground. in situations where the adj pin is connected to a resistor divider that would pull the adj pin above its 7v clamp voltage if the output is pulled high, the adj pin input current must be limited to less than 5ma. for example, a resistor divider is used to provide a regulated 1.5v output for surface mount devices, heat sinking is accomplished by using the heat spreading capabilities of the pc board and its copper traces. copper board stiffeners and plated through-holes can also be used to spread the heat gener- ated by power devices. the following table lists thermal resistance for several different board sizes and copper areas. all measurements were taken in still air on 1/16" fr-4 board with one ounce copper. table 1. measured thermal resistance copper area thermal resistance topside* backside board area (junction-to-ambient) 2500mm 2 2500mm 2 2500mm 2 110 c/w 1000mm 2 2500mm 2 2500mm 2 115 c/w 225mm 2 2500mm 2 2500mm 2 120 c/w 100mm 2 2500mm 2 2500mm 2 130 c/w 50mm 2 2500mm 2 2500mm 2 140 c/w *device is mounted on topside. calculating junction temperature example: given an output voltage of 3.3v, an input voltage range of 4v to 6v, an output current range of 0ma to 100ma and a maximum ambient temperature of 50 c, what will the maximum junction temperature be? the power dissipated by the device will be equal to: i out(max) (v in(max) C v out ) + i gnd (v in(max) ) where, i out(max) = 100ma v in(max) = 6v i gnd at (i out = 100ma, v in = 6v) = 2ma so, p = 100ma(6v C 3.3v) + 2ma(6v) = 0.28w the thermal resistance will be in the range of 110 c/w to 140 c/w depending on the copper area. so the junction temperature rise above ambient will be approximately equal to: 0.28w(125 c/w) = 35.3 c the maximum junction temperature will then be equal to the maximum junction temperature rise above ambient plus the maximum ambient temperature or: applicatio s i for atio wu uu
15 lt1962 series applicatio s i for atio wu uu from the 1.22v reference when the output is forced to 20v. the top resistor of the resistor divider must be chosen to limit the current into the adj pin to less than 5ma when the adj pin is at 7v. the 13v difference between out and adj pin divided by the 5ma maximum current into the adj pin yields a minimum top resistor value of 2.6k. in circuits where a backup battery is required, several different input/output conditions can occur. the output voltage may be held up while the input is either pulled to ground, pulled to some intermediate voltage or is left open circuit. current flow back into the output will follow the curve shown in figure 7. when the in pin of the lt1962 is forced below the out pin or the out pin is pulled above the in pin, input current will typically drop to less than 2 m a. this can happen if the input of the device is connected to a discharged (low voltage) battery and the output is held up by either a backup battery output voltage (v) 01 reverse output current ( a) 30 40 50 60 70 80 90 100 89 7 1962 f07 20 10 0 23 4 6 5 10 lt1962 lt1962-5 t j = 25 c v in = 0v current flows into output pin v out = v adj (lt1962) lt1962-1.5 lt1962-1.8 lt1962-2.5 lt1962-3 lt1962-3.3 figure 7. reverse output current or a second regulator circuit. the state of the shdn pin will have no effect on the reverse output current when the output is pulled above the input. u package descriptio dimensions in inches (millimeters) unless otherwise noted. ms8 package 8-lead plastic msop (ltc dwg # 05-08-1660) msop (ms8) 1100 * dimension does not include mold flash, protrusions or gate burrs. mold flash, protrusions or gate burrs shall not exceed 0.006" (0.152mm) per side ** dimension does not include interlead flash or protrusions. interlead flash or protrusions shall not exceed 0.006" (0.152mm) per side 0.021 0.006 (0.53 0.015) 0 ?6 typ seating plane 0.007 (0.18) 0.043 (1.10) max 0.009 ?0.015 (0.22 ?0.38) 0.005 0.002 (0.13 0.05) 0.034 (0.86) ref 0.0256 (0.65) bsc 12 3 4 0.193 0.006 (4.90 0.15) 8 7 6 5 0.118 0.004* (3.00 0.102) 0.118 0.004** (3.00 0.102) information furnished by linear technology corporation is believed to be accurate and reliable. however, no responsibility is assumed for its use. linear technology corporation makes no represen- tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
16 lt1962 series sn1962 1962fas lt/tp 0101 2k rev a ? printed in usa ? linear technology corporation 2000 linear technology corporation 1630 mccarthy blvd., milpitas, ca 95035-7417 (408) 432-1900 l fax: (408) 434-0507 l www.linear-tech.com related parts part number description comments lt1120 125ma low dropout regulator with 20 m a i q includes 2.5v reference and comparator lt1121 150ma micropower low dropout regulator 30 m a i q , sot-223 package lt1129 700ma micropower low dropout regulator 50 m a quiescent current lt1175 500ma negative low dropout micropower regulator 45 m a i q , 0.26v dropout voltage, sot-223 package lt1521 300ma low dropout micropower regulator with shutdown 15 m a i q , reverse battery protection lt1529 3a low dropout regulator with 50 m a i q 500mv dropout voltage ltc1627 high efficiency synchronous step-down switching regulator burst mode tm operation, monolithic, 100% duty cycle lt1761 100ma, low noise, low dropout micropower regulator in sot-23 20 m a quiescent current, 20 m v rms noise lt1762 150ma, low noise, ldo micropower regulator 25 m a quiescent current, 20 m v rms noise lt1763 500ma, low noise, ldo micropower regulator 30 m a quiescent current, 20 m v rms noise lt1764 3a, fast transient response low dropout regulator 340mv dropout voltage, 40 m v rms noise lt1772 constant frequency current mode step-down dc/dc controller up to 94% efficiency, sot-23 package, 100% duty cycle lt1963 1.5a, fast transient response low dropout regulator so-8, sot-223 packages burst mode is a trademark of linear technology corporation. c4 0.01 f r1 0.1 r2 0.1 r5 10k r4 2.2k r7 1.21k c2 10 f 1962 ta03 v in > 3.7v 3.3v 300ma c5 0.01 f 8 1 3 2 4 c3 0.01 f in shdn out fb byp gnd lt1962-3.3 in shdn out byp adj gnd lt1962 shdn + c1 10 f + + 1/2 lt1490 r6 2k r3 2.2k paralleling of regulators for higher output current in shdn out v in >2.7v fb gnd lt1962-2.5 r7 100k c1 10 f *adjust r1 for 0ma to 300ma constant current + r6 2.2k lt1004-1.2 c3 0.33 f c2 1 f 1962 ta04 r5 0.1 r4 2.2k r3 2k r2 40.2k r1* 1k + load 1/2 lt1490 adjustable current source typical applicatio s u
linear regulators (ldo) home > products > power management > linear regulators (ldo) > positive linear regulators (ldo) > lt1962 positive linear regulators (ldo) negative linear regulators (ldo) discrete pass element linear regulators (ldo) site help site map site index send us feedback ? 2007 linear technology | terms of use | privacy policy search lt1962 - 300ma, low noise, micropower ldo regulators features low noise: 20v rms (10hz to 100khz) output current: 300ma low quiescent current: 30a wide input voltage range: 1.8v to 20v low dropout voltage: 270mv very low shutdown current: < 1a no protection diodes needed fixed output voltages: 1.5v, 1.8v, 2.5v, 3v, 3.3v, 5v adjustable output from 1.22v to 20v stable with 3.3f output capacitor stable with aluminum, tantalum or ceramic capacitors reverse battery protection no reverse current overcurrent and overtemperature protected 8-lead msop package typical application order now request samples documentation datasheet lt1962 - 300ma, l o micropower ldo r e application note an83 performance of low noise, low d regulators: lt chronicle nov 2002 wireless infrastructure oct 2002 power m a solutions for progr a logic ics reliability data r386 reliability da t reference design dc339a - lt1962 e (pdf) software and simulatio n lt1962 spice mo d lt1962_15 spice lt1962_18 spice lt1962_25 spice lt1962_3 spice m lt1962_33 spice lt1962_5 spice m pa g e 1 of 4 linear technolo gy - lt1962 - 300ma, low noise, micro p ower ldo re g ulators lt196... 18-se p -2008 htt p ://www.linear.com/ p c/ p roductdetail. j s p ?navid=h0,c1,c1003,c1040,c1055,p1378
description the lt?1962 series are micropower, low noise, low dropout regulators. the devices are capable of supplyi ng 300ma of output current with a dropout voltage of 270mv. designed for use in battery-powered systems, the low 30a quiescent current make s them an ideal choice. quiescent current is well controlled; it does not rise in dropout as it does with many other regulators. a key feature of the lt1962 regulator s is low output noise. with the addition of an external 0.01f bypa ss capacitor, output noise drops to 20v rms over a 10hz to 100khz bandwidth. the lt1962 regulators are stable with output capacitors as low as 3.3f. small ceramic capacitors can be used without the series resistanc e required by other regulators. internal protection circuitry includes reverse battery protection, current limiting, thermal limiting and reverse cu rrent protection. the parts come in fixed output voltages of 1.5v, 1.8v , 2.5v, 3v, 3.3v and 5v, and as an adjustable device with a 1.22v refe rence voltage. the lt1962 regulators are available in the 8-lead msop package. packaging ms-8 order info part numbers ending in pbf are lead free . please contact ltc marketing for information on lead based finish parts. part numbers containing tr or trm are shipped in tape and reel or 500 unit mini tape and reel , respectively please refer to our general ordering information or the product datasheet for more details package variations and pricing back to top back to top back to top part number package pins temp price (1-99) price (1k) * rohs data lt1962ems8 msop 8 e $2.00 $1.65 view lt1962ems8#pbf msop 8 e $2.00 $1.65 view lt1962ems8#tr msop 8 e $1.71 view pa g e 2 of 4 linear technolo gy - lt1962 - 300ma, low noise, micro p ower ldo re g ulators lt196... 18-se p -2008 htt p ://www.linear.com/ p c/ p roductdetail. j s p ?navid=h0,c1,c1003,c1040,c1055,p1378
* the usa list pricing shown is for budgetary use only, shown in united states dollars (fob usa per unit for the stated volume), and is subject to change. international prices may differ due to local duties, taxes, fees and exchange rates. for volume-specific price or delivery quotes, please contact your local linear technology sales office or authorized distributor . applications cellular phones battery-powered systems noise-sensitive instrumentation systems simulate to simulate selected linear technology products, please download ltspice / switchercad iii . this powerful schematic capture and simulation lt1962ems8#trpbf msop 8 e $1.71 view lt1962ems8-1.5 msop 8 e $2.00 $1.65 view lt1962ems8-1.5#pbf msop 8 e $2.00 $1.65 view lt1962ems8-1.5#tr msop 8 e $1.71 view lt1962ems8- 1.5#trpbf msop 8 e $1.71 view lt1962ems8-1.8 msop 8 e $2.00 $1.65 view lt1962ems8-1.8#pbf msop 8 e $2.00 $1.65 view lt1962ems8-1.8#tr msop 8 e $1.71 view lt1962ems8- 1.8#trpbf msop 8 e $1.71 view lt1962ems8-2.5 msop 8 e $2.00 $1.65 view lt1962ems8-2.5#pbf msop 8 e $2.00 $1.65 view lt1962ems8-2.5#tr msop 8 e $1.71 view lt1962ems8- 2.5#trpbf msop 8 e $1.71 view lt1962ems8-3 msop 8 e $2.00 $1.65 view lt1962ems8-3#pbf msop 8 e $2.00 $1.65 view lt1962ems8-3#tr msop 8 e $1.71 view lt1962ems8- 3#trpbf msop 8 e $1.71 view lt1962ems8-3.3 msop 8 e $2.00 $1.65 view lt1962ems8-3.3#pbf msop 8 e $2.00 $1.65 view lt1962ems8-3.3#tr msop 8 e $1.71 view lt1962ems8- 3.3#trpbf msop 8 e $1.71 view lt1962ems8-5 msop 8 e $2.00 $1.65 view lt1962ems8-5#pbf msop 8 e $2.00 $1.65 view lt1962ems8-5#tr msop 8 e $1.71 view lt1962ems8- 5#trpbf msop 8 e $1.71 view buy now request samples back to top back to top pa g e 3 of 4 linear technolo gy - lt1962 - 300ma, low noise, micro p ower ldo re g ulators lt196... 18-se p -2008 htt p ://www.linear.com/ p c/ p roductdetail. j s p ?navid=h0,c1,c1003,c1040,c1055,p1378
tool includes macro models for 80% of linear technology's switching regulators, over 200 op amp models, as well as resistors, transistors and mosfet models. for other simulation tools, visit our design simulation and device models page. back to top pa g e 4 of 4 linear technolo gy - lt1962 - 300ma, low noise, micro p ower ldo re g ulators lt196... 18-se p -2008 htt p ://www.linear.com/ p c/ p roductdetail. j s p ?navid=h0,c1,c1003,c1040,c1055,p1378

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