1 gm6355 v2.04 gm6355 300ma low noise cmos ldo with enable function www.gammamicro.com.tw application battery operated systems portable computers portable cameras and video recorders reference voltage sources instruments pagers typical application circuits description the gm6355 series is a low-dropout linear regulator. it is designed specifically for battery- operated systems with the ground current as low as 50 a typical. this feature significantly extends the battery life. low power consumption and high accuracy is achieved through cmos and programmable fuse technologies. gm6355 offers adjustable output option with v ref = 0.9v as well fixed output voltages including from 0.9v to 6.0v with 0.1v increment. gm6355 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. with its high ripple rejection ratios, this series can be used with power supply noise. a 470pf capacitor from the bypass (by) input to ground reduces noise presenting on the internal reference, which in turn significantly reduces output noise. if output noise is not a concern, this input may be left unconnected. however, to use larger capacitor values c bp it will result in a longer time to rated output voltage when power is initially applied. gm6355 incorporates both over-temperature and over-current protection. sot23-5 (300mw) packages is available. ? maximum output current: 300ma ? minimum output voltage as low as 0.9v ? high output voltage accuracy: 1.5% ? low power consumption ? on chip thermal and short circuit protections ? low dropout voltage ? 300mv @ 300ma ? minimum input voltage 2.0v v in enable en 1 2 3 4 c bp bp shutdown c out = 1f 5 v out note: en (pin 3) maybe connected directly to v in (pin1) gm6355-x.x gm6355-adj figure 1 fixed output version figure 2. adjustable output version c out = 1f v in enable en 1 3 5 adj 4 v out = v ref (1+ r1/r2) r1 r2 2 shutdown
2 gm6355 v 2.04 gm6355 300ma low noise cmos ldo with enable function marking information and pin configurations (top view) sot25 ke: device code, green product v: voltage code (see next page) y: year w: week code week 1-26 : a ? z week 27-52 : a - z week 53 : a 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 kevyw out 5 3 en byp/adj 4 2 gnd 1 in
3 gm6355 v2.04 gm6355 300ma low noise cmos ldo with enable function ordering information ? green products ordering number output voltage voltage code package shipping gm6355-ast25rg adj a sot-25 3,000 units/tape and reel gm6355-1.2st25rg 1.2v c sot- 25 3,000 units/tape and reel gm6355-2.5st25rg 2.5v g sot- 25 3,000 units/tape and reel gm6355-3.3st25rg 3.3v k sot- 25 3,000 units/tape and reel absolute maximum ratings (note 1) parameter symbol ratings units input voltage v in 8 v enable voltage v en 8 v junction temperature t j - 40 to 125 c storage temperature t stg - 65 to 150 c lead temperature (soldering, 5 sec) 260 c .
4 gm6355 v 2.04 gm6355 300ma low noise cmos ldo with enable function electrical characteristics (v in = v out + 1v, t a = 25 ? c unless otherwise noted) parameter symbol condition min typ max unit i o = 1ma -1.5 1.5 output voltage accuracy (note 2) v o i o = 1ma to 300ma -3 +2 % line regulation v o / v i i o = 1ma, 2v < v in < 6v -0.3 0.05 0.3 %/v load regulation (note 1) v o / i l 1ma i o < 300ma, c out = 1 f 0.5 1.5 % v o > 2.8v 300 500 2.0v < v o < 2.8v 450 650 1.5v v o < 2.0v 900 1200 dropout voltage v o < 1.5v i o = 300ma 1300 1600 mv maximum output current i omin vo > 0.96xvraging 300 ma current limit c l 1300 ma en exit delay en delay c bp =0 f, c out =1 f i o =100ma 600 sec en input high bias current i bh v en = v in 100 na en input low bias current i bl v en = gnd -1 -0.3 a en input threshold low v tl v in =2.5v to 5.5v 0.4v v en input threshold high v th v in =2.5v to 5.5v 1.6v v ground pin current i q i o = 0ma to 300ma 50 85 a quiescent current i qs v en = gnd 0.01 1 a psrr i o = 100ma, c out = 2.2 f, f = 100hz 55 db note 1: load regulation is measured using pulse techniques with duty cycle < 5%. note 2: the nominal value of reference volt age for adjustable version is 0.9v
5 gm6355 v2.04 gm6355 300ma low noise cmos ldo 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 1.10 0.1 unit:mm 5 package outline dimensions ? sot 25
6 gm6355 v 2.04 gm6355 300ma low noise cmos ldo with enable function ordering number g m 6355 - 1.8 st25 r g apm gamma micro circuit type output voltage package type shipping type a = adj 1.8 = 1.8v 2.5 = 2.5v 3.3 = 3.3v 5.0 = 5.0v 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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