dual 150ma ultra low dropout, low noise regulator ? 2000 semtech corp. 652 mitchell road newbury park ca 91320 sc1456 preliminary - june 15, 2000 1 description the sc1456 contains two low dropout linear regulators that operate from a +2.5v to +6v input range and deliver up to 150ma. pmos pass transistors allow a low 110a supply current per device to remain independent of load, making these devices ideal for battery operated portable equipment such as cellular phones, cordless phones and personal digital assistants. each device can be powered from a separate supply voltage or the same supply voltage for maximum flexibility. the output voltage of each device can be preset or adjusted with an external resistor divider. other features include independant low powered shutdown, short circuit protection, thermal shutdown protection and reverse battery protection for each regulator. the sc1456 comes in the tiny 10 lead msop package. features ? two guaranteed 150 ma outputs ? designed to operate with ceramic capacitors ? fixed or adjustable outputs ? very small external components ? low 75v rms output noise ? very low supply currents ? thermal overload protection ? reverse battery protection ? individual low power shutdown ? surface mount packaging (10 pin msop) ? full industrial temperature range applications ? battery powered systems ? cellular telephones ? cordless telephones ? personal digital assistants ? portable instrumentation ? modems ? pcmcia cards tel:805-498-2111 fax:805-498-3804 web:http:// www.semtech.com part number package SC1456XIMSTR (1)(2) msop-10 ordering information notes: (1) where x denotes voltage options - see table on page 4. consult factory for other voltage options. (2) only available in tape and reel packaging. a reel contains 2500 devices. typical applications vout1 = preset vout2 = preset vin2 vin1 c1 1uf c4 1uf c2 1uf c3 1uf u1 sc1456 1 2 3 4 5 6 7 8 9 10 en1 gnd set1 out2 in2 en2 gnd set2 out1 in1 (or vin1) vout1 (see equation) vout2 = preset vin1 vin2 u1 sc1456 1 2 3 4 5 6 7 8 9 10 en1 gnd set1 out2 in2 en2 gnd set2 out1 in1 c1 1uf c3 2.2uf c4 1uf c2 1uf r1 r2 (or vin1) output voltages set internally output 1 set externally and output 2 set internally ? ? ? ? ? ? ? + ? = k 120 2 r 2 r 1 r 1 250 . 1 v 1 out
dual 150ma ultra low dropout, low noise regulator ? 2000 semtech corp. 652 mitchell road newbury park ca 91320 sc1456 preliminary - june 15, 2000 2 absolute maximum ratings parameter symbol maximum units input supply voltage v in -0.3 to +7 v thermal resistance junction to ambient ja 113 c/w operating ambient temperature range t a -40 to +85 c operating junction temperature range t j -40 to +125 c storage temperature range t stg -65 to +150 c lead temperature (soldering) 10 seconds t lead 300 c esd rating (human body model) esd 1.25 kv electrical characteristics (1) unless specified: v in = 3.6v, v set = gnd, v en = v in , t a = 25c. values in bold apply over full operating ambient temperature range. parameter symbol conditions min typ max units in1, in2 supply voltage range v in 2.5 6.0 v supply current i q i out = 0ma 90 130 a 160 50ma i out 150ma 110 160 a 200 v en = 0v 0.0001 1 a 2 out1, out2 output voltage (2) v out i out = 1ma -2.0% v out +2.0% v 1ma i out 150ma, v out +1v v in 5.5v -3.5% +3.5% line regulation (2) reg (line) 2.5v v in 5.5v, v set = v out , i out = 1ma 510mv 12 load regulation (2) reg (load) i out = 0ma to 50ma -10 -15 mv -20 i out = 0ma to 100ma -15 -20 mv -25 i out = 0ma to 50ma, v set = v out -2.5 -7.5 mv -15.0 i out = 0ma to 100ma, v set = v out -5 -15 mv -30
dual 150ma ultra low dropout, low noise regulator ? 2000 semtech corp. 652 mitchell road newbury park ca 91320 sc1456 preliminary - june 15, 2000 3 electrical characteristics (1) (cont.) unless specified: v in = 3.6v, v set = gnd, v en = v in , t a = 25c. values in bold apply over full operating ambient temperature range. parameter symbol conditions min typ max units out1, out2 (cont.) dropout voltage (2)(3) v d i out = 1ma 1.1 mv i out = 50ma 55 90 mv 120 i out = 100ma 110 180 mv 240 current limit i lim 150 240 350 ma output voltage noise e n 10hz to 99khz, i out = 50ma, c out = 1f 90 v rms c out = 100f 75 power supply rejection ratio psrr f = 120hz 55 db en1, en2 en input threshold v ih 1.8 v v il 0.4 en input bias current (4) i en v en = v in 0 100 na 200 set1, set2 sense/select threshold v th 20 55 80 mv set reference voltage (2) v set i out = 1ma 1.225 1.250 1.275 v 1ma i out 150ma, 2.5v v in 5.5v 1.206 1.294 set input leakage current (4) i set v set = 1.3v 0.015 2.500 na 5.000 over temperature protection high trip level t hi 170 c hysteresis t hyst 10 c note: (1) this device is esd sensitive. use of standard esd handling precautions is required. (2) low duty cycle pulse testing with kelvin connections required. (3) defined as the input to output differential at which the output voltage drops 100mv below the value measured at a differential of 2v. (4) guaranteed by design.
dual 150ma ultra low dropout, low noise regulator ? 2000 semtech corp. 652 mitchell road newbury park ca 91320 sc1456 preliminary - june 15, 2000 4 block diagram pin configuration top view msop-10 pin descriptions pin # pin name description 1 en1 active high enable pin for device 1. connect to vin1 if not being used. 2 gnd ground pin. can be used for heatsinking if needed. electrically connected to pin 7. 3 set1 connecting this pin to ground results in the internally preset value for v out1 . connecting to an external resistor divider changes v out1 to: 4 out2 regulator output for device 2, sourcing up to 150ma 5 in2 supply input pin for device 2. 6 en2 active high enable pin for device 2. connect to vin2 if not being used. 7 gnd ground pin. can be used for heatsinking if needed. electrically connected to pin 2. 8 set2 connecting this pin to ground results in the internally preset value for v out2 . connecting to an external resistor divider changes v out2 to: 9 out1 regulator output for device 1, sourcing up to 150ma 10 in1 supply input pin for device 1. ? ? ? ? ? ? + ? = 2 r 1 r 1 250 . 1 v 1 out ? ? ? ? ? ? + ? = 2 r 1 r 1 250 . 1 v 2 out voltage options replace x in the part number (sc1456xims) by the letter shown below for the corresponding voltage option: xv outa (v) v outb (v) a2.52.5 b2.82.8 c3.03.0 d3.33.3
dual 150ma ultra low dropout, low noise regulator ? 2000 semtech corp. 652 mitchell road newbury park ca 91320 sc1456 preliminary - june 15, 2000 5 device outline - msop-10 ecn 00-1167
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