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1 ltc1550/ltc1551 low noise, switched capacitor regulated voltage inverters features n regulated negative voltage from a single positive supply n low output ripple: less than 1mv p-p typ n high charge pump frequency: 900khz typ n small charge pump capacitors: 0.1 m f n requires only four external capacitors n fixed C 4.1v or adjustable output n shutdown mode drops supply current to < 1 m a n high output current: up to 10ma, v cc = 5v n output regulation: 5% n available in so-8 and 16-lead ssop n gaas fet bias generators n negative supply generators n battery-powered systems n single supply applications applicatio n s u descriptio n u the ltc ? 1550/ltc1551 are switched capacitor charge pump voltage inverters which include internal linear post- regulators to minimize output ripple. output voltages are fixed at C 4.1v, with ripple voltages typically below 1mv p-p . the ltc1550 is also available in an adjustable output voltage version. the ltc1550/ltc1551 are ideal for use as bias voltage generators for gaas transmitter fets in portable rf and cellular telephone applications. the ltc1550/ltc1551 operate from single 4.5v to 6.5v supplies and draw typical quiescent currents of 4.25ma with a 5v supply. each device includes a ttl compatible shutdown pin which drops supply current to 0.2 m a typi- cally. the ltc1550 shutdown pin is active low (shdn), while the ltc1551 shutdown pin is active high (shdn). only four external components are required: an input bypass capacitor, two 0.1 m f charge pump capacitors and a filter capacitor at the linear regulator output. the adjustable ltc1550 requires two additional resistors to set the output voltage. the ltc1550/ltc1551 will supply up to 10ma output current with a 5v supply, while maintaining guaranteed output regulation of 5%. the fixed voltage ltc1550/ltc1551 are available in s0-8 plastic packages. the adjustable ltc1550 is available in a 16-pin ssop. , ltc and lt are registered trademarks of linear technology corporation. typical applicatio n u v out output noise and ripple 10 m s/div 1550/51 ta02 v out ac coupled 2mv/div C 4.1v generator with 1mv p-p noise 1 2 v cc 8 7 sense cp out shdn v cc c1 + v out ltc1551 ferrite bead gnd c1 c out 10 m f 1550/51 f01 v out = 4.1v i load = 5ma c cp 0.1 m f c1 0.1 m f 4.7 f c in 3 4 6 5 c l 0.1 m f + +
2 ltc1550/ltc1551 absolute m axi m u m ratings w ww u (note 1) supply voltage ......................................................... 7v output voltage ................................ 0.3v to (v cc C 14v) total voltage, v cc to cp out ............................................. 14v input voltage (shdn pin) ........... C 0.3v to (v cc + 0.3v) input voltage (reg pin)............................ C 0.3v to 12v output short-circuit duration .............................. 30 sec commercial temperature range ................. 0 c to 70 c extended commercial operating temperature range (note 3) .............. C 40 c to 85 c industrial temperature range ................ C 40 c to 85 c storage temperature range ................ C 65 c to 150 c lead temperature (soldering, 10 sec)................. 300 c package/order i n for m atio n w u u order part number ltc1550cs8-4.1 ltc1551cs8-4.1 consult factory for military grade parts. order part number ltc1550cgn ltc1550ign top view gn package 16-lead plastic ssop 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 nc c1 + nc v out c1 pgnd agnd nc v cc shdn reg sense adj cp out nc nc t jmax = 150 c, q ja = 150 c/ w gn part marking 1550 1 2 3 4 8 7 6 5 top view sense cp out gnd c1 shdn* v cc c1 + v out s8 package 8-lead plastic so t jmax = 150 c, q ja = 150 c/ w *shdn for ltc1550, shdn for ltc1551 symbol parameter conditions min typ max units v cc supply voltage (ltc1550cgn/ltc1550ign) l 2.7 6.5 v (ltc1550cs8-4.1/ltc1551cs8-4.1) l 4.5 6.5 v v ref reference voltage l 1.24 v i s supply current v cc = 5v, v shdn = v cc (ltc1550) or gnd (ltc1551) l 4.25 7 ma v cc = 5v, v shdn = gnd (ltc1550) or v cc (ltc1551) l 0.2 10 m a f osc internal oscillator frequency 900 khz v ol reg output low voltage i reg = 1ma, v cc = 5v l 0.1 0.8 v i reg reg sink current v reg = 0.8v, v cc = 5v l 715 ma v ih shdn input high voltage v cc = 5v l 2v v il shdn input low voltage v cc = 5v l 0.8 v i in shdn input current v shdn = v cc l 0.1 1 m a t on turn-on time i out = 10ma 1 ms v out output regulation 2.7v v cc 6.5v, 0 i out 5ma l C 1.575 C 1.5 C 1.425 v (ltc1550cgn/ltc1550ign) 2.8v v cc 6.5v, 0 i out 10ma l C 1.575 C 1.5 C 1.425 v 3.5v v cc 6.5v, 0 i out 20ma l C 1.575 C 1.5 C 1.425 v v out output regulation 2.7v v cc 6.5v, 0 i out 5ma l C 2.1 C 2.0 C 1.9 v (ltc1550cgn/ltc1550ign) 3.1v v cc 6.5v, 0 i out 10ma l C 2.1 C 2.0 C 1.9 v 3.75v v cc 6.5v, 0 i out 20ma l C 2.1 C 2.0 C 1.9 v v cc = 4.5v to 6.5v, c1 = c2 = 0.1 m f, c out = 10 m f, t a = 25 c unless otherwise specified. (note 3) electrical characteristics
3 ltc1550/ltc1551 v cc = 4.5v to 6.5v, c1 = c2 = 0.1 m f, c out = 10 m f, t a = 25 c unless otherwise specified. (note 3) electrical characteristics symbol parameter conditions min typ max units v out output regulation 3.05v v cc 6.5v, 0 i out 5ma l C 2.625 C 2.5 C 2.375 v (ltc1550cgn/ltc1550ign) 3.45v v cc 6.5v, 0 i out 10ma l C 2.625 C 2.5 C 2.375 v 4.1v v cc 6.5v, 0 i out 20ma l C 2.625 C 2.5 C 2.375 v v out output regulation 3.45v v cc 6.5v, 0 i out 5ma l C 3.15 C 3.0 C 2.85 v (ltc1550cgn/ltc1550ign) 3.85v v cc 6.5v, 0 i out 10ma l C 3.15 C 3.0 C 2.85 v 4.5v v cc 6.5v, 0 i out 20ma l C 3.15 C 3.0 C 2.85 v v out output regulation 3.9v v cc 6.5v, 0 i out 5ma l C 3.675 C 3.5 C 3.325 v (ltc1550cgn/ltc1550ign) 4.2v v cc 6.5v, 0 i out 10ma l C 3.675 C 3.5 C 3.325 v 4.85v v cc 6.5v, 0 i out 20ma l C 3.675 C 3.5 C 3.325 v v out output regulation 4.5v v cc 6.5v, 0 i out 5ma l C 4.3 C 4.1 C 3.9 v (ltc1550cgn/ltc1550ign) 4.75v v cc 6.5v, 0 i out 10ma l C 4.3 C 4.1 C 3.9 v 5.35v v cc 6.5v, 0 i out 20ma l C 4.3 C 4.1 C 3.9 v v out output regulation 4.8v v cc 6.5v, 0 i out 5ma l C 4.725 C 4.5 C 4.275 v (ltc1550cgn/ltc1550ign) 5.1v v cc 6.5v, 0 i out 10ma l C 4.725 C 4.5 C 4.275 v 5.7v v cc 6.5v, 0 i out 20ma l C 4.725 C 4.5 C 4.275 v v out output regulation 4.5v v cc 6.5v, 0 i out 5ma l C 4.3 C 4.1 C 3.9 v (ltc1550cs8-4.1/ltc1551cs8-4.1) 4.75v v cc 6.5v, 0 i out 10ma l C 4.3 C 4.1 C 3.9 v 5.35v v cc 6.5v, 0 i out 20ma l C 4.3 C 4.1 C 3.9 v i sc output short-circuit current v out = 0v, v cc = 5v l 50 150 ma v out = 0v, v cc = 6.5v l 80 200 ma v ripple output ripple voltage 1mv the l denotes specifications which apply over the specified temperature range. note 1: absolute maximum ratings are those values beyond which the life of a device may be impaired. note 2: all currents into device pins are positive; all currents out of device pins are negative. all voltages are referenced to ground unless otherwise specified. all typicals are given at t a = 25 c. note 3: c-grade device specifications are guaranteed over the 0 c to 70 c temperature range. in addition, c-grade device specifications are assured over the C 40 c to 85 c temperature range by design or correlation, but are not production tested. typical perfor m a n ce characteristics u w temperature (?c) ?5 oscillator frequency (khz) 875 925 975 15 55 ltc1550/51 g01 825 775 ?5 5 35 75 95 725 675 v out = 4.1v v cc = 5v output current (ma) 0 output voltage (v) 3.6 3.8 4.0 4.2 3.4 3.0 5 10 15 20 ltc1550/51 g03 25 30 3.2 t a = 25 c v cc = 4.5v v cc = 5v v cc = 6.5v supply current vs temperature temperature ( c) ?5 3.0 supply current (ma) 3.5 4.5 5.0 5.5 ?5 15 35 95 ltc1550/51 g02 4.0 ? 55 75 6.0 v out = 4.1v v cc = 5v oscillator frequency vs temperature output voltage vs output current (ltc1550cs8-4.1/ltc1551cs8-4.1)
4 ltc1550/ltc1551 typical perfor m a n ce characteristics u w 0ma 1ms/div ltc1550/51 ? g07 load transient response (see figure 2, v cc = 5v) 10ma ac coupled 5mv/div v out i out 5v 2ms/div ltc1550/51 ? g08 line transient response (see figure 2, i l = 10ma) ac coupled 5mv/div 5.5v v out v cc minimum required v cc vs v out and i out frequency (hz) 100k noise (db v) 90 80 70 60 50 40 30 20 10 0 ?0 1m 10m lt1550/51 ?g09 frequency (khz) 1 0.01 noise ( v/ ? hz) 1 0.1 10 10 100 ltc1550/51 ?g10 spot noise (*see typical application) output spectrum (see figure 2, c out = 10 m f) frequency (hz) 100k noise (db v) 90 80 70 60 50 40 30 20 10 0 ?0 1m 10m lt1550/51 ?g11 v cc = 5v i l = 5ma c in = 4.7 f c out = 10 f c l = 0.1 f start-up time vs supply voltage supply voltage (v) 4.50 start-up time (ms) 1.0 1.2 1.4 5.25 5.50 6.25 6.00 ltc1550/51 g05 0.8 0.6 0.4 4.75 5.00 5.75 1.6 1.8 2.0 6.50 t a = 25 c v out = 4.1v r l = 390 maximum output current vs supply voltage supply voltage (v) 4.50 maximum output current (ma) 50 45 40 35 30 25 20 15 10 5 0 5.00 5.50 5.75 ltc1550/51 ?tpc04 4.75 5.25 6.00 6.25 6.50 t a = 25 c 5v 0v 0v C 4.1v v out shdn 0.2ms/div ltc1550/51 ? g06 startup time (ltc1550 shown) output voltage (v) ? positive supply voltage (v) 6.0 5.6 5.2 4.8 4.4 4.0 3.6 3.2 2.8 2.4 2.0 ? ltc1550/51 ?g08.5 ? ? ? 0 i out = 20ma i out = 10ma i out = 5ma output spectrum (*see typical application) * on first page of data sheet.
5 ltc1550/ltc1551 typical perfor m a n ce characteristics u w spot noise (see figure 2, c out = 10 m f) frequency (khz) 1 0.01 noise ( v/ ? hz) 1 0.1 10 10 100 ltc1550/51 ?g12 v cc = 5v i l = 5ma c in = 4.7 f c out = 10 f c l = 0.1 f output spectrum (see figure 2, c out = 22 m f) frequency (hz) 100k noise (db v) 90 80 70 60 50 40 30 20 10 0 ?0 1m 10m lt1550/51 ?g13 v cc = 5v i l = 5ma c in 4.7 f c out = 22 f c l = 0.1 f spot noise (see figure 2, c out = 22 m f) frequency (khz) 1 0.01 noise ( v/ ? hz) 1 0.1 10 10 100 ltc1550/51 ?g14 v cc = 5v i l = 5ma c in = 4.7 f c out = 22 f c l = 0.1 f pi n fu n ctio n s uuu shdn: shutdown (ttl compatible). this pin is active low (shdn) for the ltc1550 and active high (shdn) for the ltc1551. when this pin is at v cc (gnd for ltc1551), the ltc1550 operates normally. when shdn is pulled low (high for ltc1551), the ltc1550 enters shutdown mode. in shutdown, the charge pump stops, the output collapses to 0v, and the quiescent current drops typically to 0.2 m a. v cc : power supply. v cc requires an input voltage between 4.5v and 6.5v for the fixed voltage ltc1550cs8-4.1/ ltc1551cs8-4.1. the adjustable voltage ltc1550cgn/ ltc1550ign operates with a vcc range of 2.7v to 6.5v. output voltage and output load current conditions depend on the vcc supply voltage. consult the electrical charac- teristics table and typical performance characteristics for guaranteed test points. the difference between the input voltage and output should never be set to exceed 14v or damage to the chip may occur. v cc must be bypassed to pgnd (gnd for 8-pin packages) with at least a 0.1 m f capacitor placed in close proximity to the chip. a 4.7 m f or larger bypass capacitor is recommended to minimize noise and ripple at the output. c1 + : c1 positive input. connect a 0.1 m f capacitor between c1 + and c1 C . v out : negative voltage output. this pin must be bypassed to ground with a 4.7 m f or larger capacitor to ensure regulator loop stability. at least 10 m f is recommended to provide specified output ripple. an additional 0.1 m f low esr capacitor is recommended to minimize high fre- quency spikes at the output. c1 C : c1 negative input. connect a 0.1 m f capacitor from c1 + to c1 C . gnd: ground. connect to a low impedance ground. a ground plane will help minimize regulation errors. cp out : negative charge pump output. this pin requires a 0.1 m f storage capacitor to ground. sense: connect to v out . the ltc1550/ltc1551 internal regulator uses this pin to sense the output voltage. for optimum regulation, sense should be connected close to the output load. ssop package only pgnd: power ground. connect to a low impedance ground. pgnd should be connected to the same potential as agnd. agnd: analog ground. connect to a low impedance ground. agnd should be connected to a ground plane to minimize regulation errors.
6 ltc1550/ltc1551 pi n fu n ctio n s uuu reg: this is an open-drain output that pulls low when the output voltage is within 5% of the set value. it will sink 7ma to ground with a 5v supply. the external circuitry must provide a pull-up or reg will not swing high. the voltage at reg may exceed v cc and can be pulled up to 12v above ground without damage. adj: for adjustable versions only, this is the feedback point for the external resistor divider string. connect a divider string from agnd to v out with the divided tap connected to adj. note that the resistor string needs to be connected upside-down from a traditional negative regu- lator. see the applications information section for hook- up details. nc: no internal connection. block diagra m w + + s2 s3 s1 s4 c cp v cc cp out c1 + c1 c1 clk 900khz sense charge pump linear regulator 1550/51 bd v out adj reg c out 60mv 1.18v *shdn *shdn for ltc1550, shdn for ltc1551 ** fixed output versions only comp2 ** ** + 1.24v applicatio n s i n for m atio n wu u u overview the ltc1550/ltc1551 are switched capacitor, inverting charge pumps with internal linear post-regulators. the ltc1550cs8/ltc1551cs8 provide a regulated, low ripple C 4.1v output at up to 10ma load current from a single 5v supply. the ltc1550cgn provides a regulated, low ripple adjustable output. output load current for the adjustable version depends on the input/output voltage combination. consult the graph provided in the typical performance characteristics section and the electrical characteristics table for guaranteed test points. the ltc1550/ltc1551 are ideal for use as bias voltage generators for gaas transmitter fets in portable rf and cellular telephone applications. the ltc1550 features an active-low shutdown pin (shdn) that drops quiescent current to below 1 m a. the ltc1551 is identical to the ltc1550,
7 ltc1550/ltc1551 except that the shutdown pin is active-high (shdn). all members of the ltc1550 family feature a 900khz charge pump frequency. the ltc1550/ ltc1551 come standard with fixed C 4.1v output voltages and the ltc1550 is available with an adjustable output voltage. both devices can be configured with other fixed output voltages; contact linear technology for more information. the ltc1550 consists of two major blocks (see block diagram): an inverting charge pump and a negative linear regulator. the charge pump uses two external capacitors, c1 and c cp to generate a negative voltage at cp out . it operates by charging and discharging c1 on alternate phases of the internal 900khz clock. c1 is initially charged to v cc through switches s1 and s3. when the internal clock changes phase, s1 and s3 open and s2 and s4 close, shorting the positive side of c1 to ground. this forces the negative side of c1 below ground, and charge is transferred to c cp through s4. as this cycle repeats, the magnitude of the negative voltage approaches v cc . the 900khz internal clock frequency helps keep noise out of 400khz to 600khz if bands commonly used by portable radio frequency systems and reduces the size of the external capacitors required. most applications can use standard 0.1 m f ceramic capacitors for c1 and c cp . increasing c1 and c cp beyond 0.1 m f has little effect on the output ripple or the output current capacity of the ltc1550/ltc1551. the negative voltage at cp out supplies the input to the negative regulator block. this block consists of an n-channel mosfet pass device and a feedback amplifier that monitors the output voltage and compares it to the internal reference. the regulated output appears at the v out pin. the regulation loop is optimized for fast tran- sient response, enabling it to remove most of the switch- ing artifacts present at the cp out pin. output ripple is typically below 1mv p-p with output loads between 0ma and 10ma. the output voltage is set to C 4.1v by a pair of internal divider resistors. the n-channel pass device mini- mizes dropout, allowing the output to remain in regulation with supply voltages as low as 4.5v. an output capacitor of at least 4.7 m f from v out to ground is required to keep the regulator loop stable; for optimum stability and mini- mum output ripple, at least 10 m f is recommended. applicatio n s i n for m atio n wu u u 6, 7 10 pgnd, agnd ltc1550 v out , sense 4, 11 adj r1 r2 v out = ?.24v r1 + r2 r2 () ltc1550/51 ?f02 figure 1. external resistor connections adjustable hook-up the ltc1550cgn is available in an adjustable output version in a 16-pin ssop package. the output voltage is set with a resistor divider from gnd to sense/v out (figure 1). note that the internal reference and the internal feedback amplifier are set up as a positive-output regula- tor referenced to the sense pin, not a negative regulator referenced to ground. the output resistor divider must be set to provide a 1.24v at the adj pin with respect to v out . for example, a C 3v output would require a 13k resistor from gnd to adj, and a 9.1k resistor to sense/v out . if, after connecting the divider resistors, the output voltage is not what you expected, try swapping them. capacitor selection the ltc1550/ltc1551 requires four external capacitors: an input bypass capacitor, two 0.1 m f charge pump capaci- tors and an output filter capacitor. the overall behavior of the ltc1550/ltc1551 is strongly affected by the capaci- tors used. in particular, the output capacitor has a signifi- cant effect on the output ripple and noise performance. proper capacitor selection is critical for optimum perfor- mance of the ltc1550/ltc1551. output ripple vs output capacitor figure 3 shows the effect of using different output capaci- tor values on ltc1550/ltc1551 output ripple. these curves are taken using the circuit in figure 2, with c in = 4.7 m f and i load = 5ma. the upper curve shows the performance with a standard tantalum capacitor alone and the lower curve shows the tantalum capacitor in parallel with a 0.1 m f ceramic capacitor. as a general rule, larger
8 ltc1550/ltc1551 applicatio n s i n for m atio n wu u u output capacitors provide lower output ripple. to keep ripple below 1mv p-p , 10 m f or greater, with a 0.1 m f ceramic capacitor in parallel, is required. at least 4.7 m f is required at the output under all conditions to guarantee loop stability. figure 3 shows a marked decrease in peak-to-peak output ripple when a 0.1 m f ceramic capacitor added in parallel with the tantalum output capacitor. the additional ripple with the tantalum output capacitor alone is mostly very high order harmonics of the 900khz clock, which appear as sharp "spikes" at the output. the energy in these spikes is very small and they do not contribute to the rms output voltage, but their peak-to-peak amplitude can be several figure 5. output ripple with 10 m f tantalum capacitor paralleled with 0.1 m f ceramic capacitor 10 m s/div ltc1550/51 ? f04 v out ac couple 2mv/div millivolts under some conditions. a garden variety 0.1 m f ceramic capacitor has significantly lower impedance at the spike frequency than even a large tantalum capacitor, and helps eliminate most of these left-over switching spikes that the tantalum capacitor leaves behind. figure 4 and 5 show scope photos of the output of figure 3 with and without the additional ceramic capacitor at the output. a series rc or lc filter can reduce high frequency output noise even further. due to the high 900khz switching frequency, not much r or l is required; a ferrite bead or a relatively long pc board trace in series with 0.1 m f ceramic capacitor will usually keep the output ripple well below 1mv p-p . the cover page shows an example of an ultralow 5 m s/div ltc1550/51 ? f03 figure 4. output ripple with 10 m f tantalum capacitor v out ac couple 5mv/div figure 2. output ripple test circuit 1 2 v cc 8 7 sense cp out shdn v cc c1 + v out ltc1551 gnd c1 c out 10 m f 1550/51 f03 v out 4.1v c cp 0.1 m f c1 0.1 m f c in 4.7 f 3 4 6 5 c l 0.1 m f* *c l is optional + + figure 3. output ripple vs output capacitance output capacitance ( f) 8 7 6 5 4 3 2 1 0 10 ltc1550/51 ?f04 output ripple (mv p-p ) 1 100 v cc = 6v t a = 25 c c in = 4.7 f without 0.1 f with 0.1 f
9 ltc1550/ltc1551 applicatio n s i n for m atio n wu u u noise C 4.1v generator which uses a ferrite bead output filter to achieve better than 1mv p-p noise and output ripple. the corresponding spectrum and spot noise plots for this circuit are shown in the typical performance characteristics section. output ripple vs input bypass capacitor the input bypass capacitor (c in ) can also have a fairly significant impact on the output ripple. c in provides most of the ltc1550/ltc1551s supply current while it is charging the flying capacitor (c1). inadequate input bypass can cause the v cc supply to dip when the charge pump switches, causing the output linear regulator to momentarily stop regulating. c in should be mounted as close to the ltc1550/ltc1551 as possible and its value should be significantly larger than c1. tantalum capacitors with low esr generally provide adequate performance. figure 6 shows the ltc1550/ltc1551 peak-to-peak output ripple vs c in , taken using the test circuit in figure 2 with i load set at 5ma. c out is a 10 m f in parallel with a 0.1 m f ceramic capacitor. a 4.7 m f tantalum capacitor at v cc generally provides adequate output ripple performance for most applica- tions. C 4.1v output gaas fet bias generator figure 6. output ripple vs input bypass capacitance input capacitance ( f) 0.1 output ripple (mv p-p ) 8 7 6 5 4 3 2 1 0 1 10 100 ltc1550/51 ?f07 v cc = 6v t a = 25 c c out = 10 f typical applicatio n u 1 2 4.5v v cc 6.5v 8 7 sense cp out shdn v cc c1 + v out ltc1550 4.1v bias gnd c1 c out 10 m f 1550/51 ta02 c cp 0.1 m f gaas transmitter c1 0.1 m f c in 4.7 m f 3 4 6 5 c l 0.1 m f + +
10 ltc1550/ltc1551 dimensions in inches (millimeters) unless otherwise noted. package descriptio n u gn package 16-lead plastic ssop (narrow 0.150) (ltc dwg # 05-08-1641) gn16 (ssop) 0895 * dimension does not include mold flash. mold flash shall not exceed 0.006" (0.152mm) per side ** dimension does not include interlead flash. interlead flash shall not exceed 0.010" (0.254mm) per side 12 3 4 5 6 7 8 0.229 ?0.244 (5.817 ?6.198) 0.150 ?0.157** (3.810 ?3.988) 16 15 14 13 0.189 ?0.196* (4.801 ?4.978) 12 11 10 9 0.016 ?0.050 (0.406 ?1.270) 0.015 0.004 (0.38 0.10) 45 0 ?8 typ 0.0075 ?0.0098 (0.191 ?0.249) 0.053 ?0.069 (1.351 ?1.748) 0.008 ?0.012 (0.203 ?0.305) 0.004 ?0.009 (0.102 ?0.249) 0.025 (0.635) bsc
11 ltc1550/ltc1551 dimensions in inches (millimeters) unless otherwise noted. package descriptio n u s8 package 8-lead plastic small outline (narrow 0.150) (ltc dwg # 05-08-1610) 1 2 3 4 0.150 ?0.157** (3.810 ?3.988) 8 7 6 5 0.189 ?0.197* (4.801 ?5.004) 0.228 ?0.244 (5.791 ?6.197) 0.016 ?0.050 0.406 ?1.270 0.010 ?0.020 (0.254 ?0.508) 45 0 ?8 typ 0.008 ?0.010 (0.203 ?0.254) so8 0996 0.053 ?0.069 (1.346 ?1.752) 0.014 ?0.019 (0.355 ?0.483) 0.004 ?0.010 (0.101 ?0.254) 0.050 (1.270) typ dimension does not include mold flash. mold flash shall not exceed 0.006" (0.152mm) per side dimension does not include interlead flash. interlead flash shall not exceed 0.010" (0.254mm) per side * ** 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.
12 ltc1550/ltc1551 15501fa lt/tp 0897 rev a 4k ? printed in usa ? linear technology corporation 1996 typical applicatio n u < 1mv p-p ripple, C 4.1v output gaas fet bias generator related parts part number description comments lt ? 1054 switched-capacitor voltage converter with regulator 100ma switched-capacitor converter ltc1261 switched-capacitor regulated voltage inverter selectable fixed output voltages ltc1429 clock-synchronized switched-capacitor voltage inverter synchronizable up to 2mhz system clock linear technology corporation 1630 mccarthy blvd., milpitas, ca 95035-7417 l (408) 432-1900 fax: (408) 434-0507 l telex: 499-3977 l www.linear-tech.com 1 2 4.5v v cc 6.5v 8 7 sense cp out shdn v cc c1 + v out ltc1550 4.1v gnd c1 c out 10 m f 1550/51 ta03 c cp 0.1 m f gaas transmitter c1 0.1 m f c in 4.7 m f 3 4 6 5 c l 0.1 m f ferrite bead + +

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