1 gm6655 600ma low dropout cmos voltage regulator with enable function gm6655 v2.05 typical application circuits description the gm6655 series is a low-dropout linear regulator. this series is specially designed for battery-operated systems. the ground current is very low (50a typ), that significantly extending battery life. low power consumption and high accuracy is achieved through cmos and programmable fuse technologies with the output voltage range from 1.5v to 6.0v. the gm6655 consists of a high-precision voltage reference, an error correction circuit, and a current limited output driver. with good transient responses, output remains stable even during load changes. the shdn input enables the output to be turned off, resulting in reduced power consumption. also, the gm6655 having high ripple rejection ratios, the series can be used with power supply noise. a 470pf capacitor from the bypass input to ground reduces noise present on the internal reference, which in turn significantly reduces output noise. if output noise is not a concern, this input may be left unconnected. larger capacitor values c bp be used, but results in a longer time period to rated output voltage when power is initially applied. the gm6655 incorporates both over-temperature and over-current protection. features ? maximum output current up 600ma ? highly accurate output voltage: 1.5% ? low power consumption ? on-chip protections: thermal, and short circuit ? small input/output differential: 600mv at 600ma application battery operated systems portable computers portable caremas and video recorders reference voltage sources instruments pagers v in enable shutdown en c out = 1 f note: en (pin 3) maybe connected directly to v in (pin1) gm6655-x.x 1 2 3 4 c bp bp v in enable shutdown en c out = 1 f gm6655-adj 1 2 3 5 adj 4 v out = v ref (1+ r2/r1) r1 r2 5 v out figure 1 fixed output version figure 2. adjustable output version
2 gm6655 v 2.05 gm6655 600ma low dropout cmos voltage regulator with enable function marking information and pin configurations (top view) sot25 fe : device code, green product v: voltage code (see next page) y: year w: week code pin descriptions pin number pin name pin function 1 in supply input 2 gnd ground 3 en enable/shutdown (input): cmos compatible input. logic high = enable; logic low or open = shutdown fixed output byp reference bypass: connect external 470pf capacitor to gnd to reduce output noise. may be left open. 4 adjustable output adj adjust (input): adjustable regulat or feedback input. connect to resistor voltage divider 5 out regulator output ordering information ordering number output voltage voltage code package shipping gm6655-ast25rg adj a sot-25 3,000 units/tape and reel gm6655-1.8st25rg 1.8v e sot- 25 3,000 units/tape and reel gm6655-2.0st25rg 2.0v f sot- 25 3,000 units/tape and reel gm6655-2.5st25rg 2.5v g sot- 25 3,000 units/tape and reel gm6655-2.7st25rg 2.7v t sot- 25 3,000 units/tape and reel gm6655-2.8st25rg 2.8v h sot- 25 3,000 units/tape and reel gm6655-2.9st25rg 2.9v x sot- 25 3,000 units/tape and reel gm6655-3.0st25rg 3.0v j sot- 25 3,000 units/tape and reel gm6655-3.3st25rg 3.3v k sot- 25 3,000 units/tape and reel gm6655-3.6st25rg 3.6v l sot- 25 3,000 units/tape and reel gm6655-4.0st25rg 4.0v m sot- 25 3,000 units/tape and reel gm6655-4.2st25rg 4.2v y sot- 25 3,000 units/tape and reel gm6655-5.0st25rg 5.0v q sot- 25 3,000 units/tape and reel fe vyw out 5 3 en byp/adj 4 2 gnd 1 in
3 gm6655 600ma low dropout cmos voltage regulator with enable function gm6655 v2.05 absolute maximum ratings parameter symbol ratings units input voltage v in 7 v output current i out 600 ma output voltage v out v ss ? 0.3 to v in +0.3 v continuous total power dissipation sot-25 p d 300 mw operating ambient temperature t a - 40 to 125 j storage temperature t stg - 65 to 150 j lead temperature (soldering, 10 sec) + 260 j block diagram v in c byp (optional) v out c out in byp en out gnd v ref current limit ultra low noise fixed re g ulato r ultra low noise a d j ustable re g ulato r in en out gnd v ref current limit v in v out c out adj c byp (optional) r1 r2 v out = v ref (1+ r2/r1)
4 gm6655 v 2.05 gm6655 600ma low dropout cmos voltage regulator with enable function electrical characteristics (t a = 25 j , v in = v out + 1v unless otherwise noted) parameter symbol condition min typ max unit i out = 1ma, -1.5 +1.5 output voltage a ccuracy, note 2 i out = 1 to 600ma, -3.0 +3.0 % line regulation ? v oi i out = 1ma, v out + 0.1v < v in < 6.5v figure 3 -0.3 0.05 0.3 %/v load regulation, note 1 ? v ol 1ma < i out < 600ma c out = 1f figure 4 0.01 0.04 %/ma v out > 2.8v 0.6 1.0 2.0v < v out < 2.8v 0.9 1.4 dropout voltage v out < 2.0v ? v i out = 600ma 1.3 1.9 v maximum output current i outmax v out > 0.96xv rating 600 ma output current limit i cl 500 1,300 ma v en = v in, i out = 1 to 600ma, figure 5 50 85 a quiescent current i q2 v en =gnd (shutdwon) 0.001 1 a en exit delay t dly c bp = 0f, c out = 1f, i out = 100ma 600 sec en input bias current i bh v en =v in 100 na en input low current i bl v en =gnd -1 -3 a en input threshold low v thl 0.4 v en input threshold high v thh 2 v power supply rejection ration psrr 10khz 55 db note 1: load regulation is measured using pulse techniques with duty cycle < 5% note 2: the nominal value of reference voltage for adjustable version is 1.27v gm6655 v in v out en bp 1f 1ma i out 600ma pulse with duty cycle 5% gm6655 v in v out en bp i out = 600ma gm6655 (v out + 1v) v in 6.5v v out en bp 1f i out = 1ma fig 3. line regulation fig 4. loa d regulation fig 5. load regulation
5 gm6655 600ma low dropout cmos voltage regulator with enable function gm6655 v2.05 typical performance characteristics 0 10 20 30 40 50 60 70 80 90 0.01 0.1 1 10 100 50ma 30ma 1ma ripple rejection (db) frequency (khz) fig 6. psrr vs. frequency
6 gm6655 v 2.05 gm6655 600ma low dropout cmos voltage regulator with enable function pad layout 0.028 1.0 ( inches ) 0.039 0.094 2.4 0.037 0.95 0.037 0.95 0.074 1.9 0.7 mm 0.13 0~0.1 0.8 0.05 2.9 0.1 2.8 0.35 0.03 1.9 0.05 0.95 0.038 1.5 0.05 0.1 0.65 0.05 5 x 1.10 0.1 unit:mm 5 x package outline dimensions ? sot 25
7 gm6655 600ma low dropout cmos voltage regulator with enable function gm6655 v2.05 ordering number g m 6655 - 1.8 st25 r g apm gamma micro circuit type output voltage package type shipping type 1.8 = 1.8v 2.0 = 2.0v 2.5 = 2.5v 3.3 = 3.3v 5.0 = 5.0v a=adj st25: sot 25 r: t ape & reel blank: pb-free g:green note: pb-free products: ? rohs compliant and compatible with the cu rrent require-ments of ipc/jedec j-std-020. ? suitable for use in snpb or pb-free soldering processes with 100% matte tin (sn) plating. green products: ? lead-free (rohs compliant) ? halogen free(br or cl does not exceed 900ppm by weight in homogeneous material and total of br and cl does not exceed 1500ppm by weight)
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