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www.globaltechsemi.com 1 gs2911 gs2911 300ma cmos positive ldo voltage regulator product description the gs2911 is a positive voltage output, three-pi n regulator that provides a high current even when the input/output voltage differential is small. low power consumption and high accuracy is achieved through cmos and laser trimming technologies. the gs2911 consists of a high-precision volt age reference, an error correction circuit, and a current limited output driver. transient response to load variations has improved in comparison to the existing series. to-92 and sot-89 packages are available. features applications maximum output current: 250ma (within the maximum power dissipation, v out =5.0v) output voltage: 2.0v to 6.0v in 0.1v increments (1.1v to 1.9v for custom products) highly accurate: output voltage 2% (1% for semi-custom products) low power consumption: typ. 2.0a at v out = 5.0v output voltage temperature coefficient 0.1%/v: typ. 100ppm/ input stability: typ. 2.0%/v small input/output differential: i out = 100ma at v out = 5.0v with a 0.12v differential. sot-89 and to-92 packages are available wireless communication systems battery powered systems palmtops portable cameras and video recorders voltage regulator for microprocessor voltage regulator for cd-rom drivers, lan cards, 56k modem
gs2911 globaltech semiconductor www.globaltechsemi.com 2 gs2911 block diagram vout vin vss current limiter + - voltage reference package and pin assignments gs2911yxx (sot-89) gs2911nxx (to-92) 123 pin1 = gnd pin2 = v in pin3 = v out 1 2 3 pin1 = gnd pin2 = v in pin3 = v out ordering information sot-89 to-92 output gs2911y15 gs2911n15 1.5v GS2911Y18 gs2911n18 1.8v gs2911y20 gs2911n20 2.0v gs2911y25 gs2911n25 2.5v gs2911y33 gs2911n33 3.3v gs2911y50 gs2911n50 5.0v *for additional available fixed voltages contact factory. *add ?f? means lead free part.
gs2911 globaltech semiconductor www.globaltechsemi.com 3 gs2911 absolute maximum ratings parameter symbol ratings input voltage v in 12v output current i out 500 ma output voltage v out vss-0.3 to v in+ 0.3 continuous total power dissipation to-92 sot-89 p d 500 mw 550 mw operating ambient temperature t opr 0 to 80 storage temperature range t stg -40 to 125 lead temperature (10 sec) t lead 260 electrical characteristics v out (t) =2.0 (note 1) parameter symbol conditions min typ. max unit output voltages v out (e) (note 2) i out = 40ma v in = 3.0v 1.960 2.000 2.040 v maximum output current i out max v in = 3.0v v out (e) R 1.8v 100 ma load stability v out v in = 3.0v 1ma Q i out Q 60ma 45 90 mv vdif i out =60ma 180 360 mv input-output voltage differential (note 3) i out =120ma 400 700 mv supply current i ss v in = 3.0v 1.0 100 a line regulation v out v in * v out i out = 40ma 3.0v Q v in Q 10.0v 0.2 0.3 %/v input voltage v in 10 v output voltage temperature characteristics v out topr * v out i out = 40ma -40 Q topr Q 85 100 ppm/
gs2911 globaltech semiconductor www.globaltechsemi.com 4 gs2911 electrical characteristics v out (t) =2.5v (note 1) parameter symbol conditions min typ. max unit output voltages v out (e) (note 2) i out = 40ma v in = 3.5v 2.450 2.500 2.550 v maximum output current i out max v in = 3.5v v out (e) R 2.25v 150 ma load stability v out v in = 3.5v 1ma Q i out Q 80ma 45 90 mv vdif i out =80ma 180 360 mv input-output voltage differential (note 3) i out =160ma 400 700 mv supply current iss v in = 3.5v 1.0 100 a line regulation v out v in * v out i out = 40ma 3.5v Q v in Q 10.0v 0.2 0.3 %/v input voltage v in 10 v output voltage temperature characteristics v out topr * v out i out = 40ma -40 Q topr Q 85 100 ppm/ electrical characteristics v out (t) =3.3 (note 1) parameter symbol conditions min typ. max unit output voltages v out (e) (note 2) i out = 40ma v in = 4.3v 3.234 3.3 3.366 v maximum output current i out max v in = 4.3v v out (e) R 2.97v 165 ma load stability v out v in = 4.3v 1ma Q i out Q 80ma 45 90 mv vdif vin = 4.3v input-output voltage differential (note 3) iout=160ma 400 700 mv supply current iss v in = 4.3v 1.0 100 a line regulation v out v in * v out i out = 40ma 4.3v Q v in Q 10.0v 0.2 0.3 %/v input voltage v in 10 v output voltage v out i out = 40ma 100 ppm/
gs2911 globaltech semiconductor www.globaltechsemi.com 5 gs2911 temperature characteristics topr * v out -40 Q topr Q 125 electrical characteristics v out (t) =5.0 (note 1) parameter symbol conditions min typ max unit output voltages v out (e) (note 2) i out = 40ma v in = 6.0v 4.900 5.000 5.100 v maximum output current i out max v in = 6.0v v out (e) 5.0v 165 ma load stability ? v out v in = 6.0v 1ma i out 80ma 45 90 mv vdif v in = 6.0v input-output voltage differential (note 3) vdif i out =200ma 380 600 mv supply current iss v in = 6.0v 1.0 100 a line regulation ? v out ? v in i ? v out i out = 40ma 4.3v v in 10.0v 0.2 0.3 %/v input voltage v in 10 v output voltage temperature characteristics ? v out ? topr i ? v out i out = 40ma -40 topr 125 100 ppm/ note1. v out (t) = specified output voltage. note2. v out (e) = effective output voltage (i.e. the output voltage when ? v out (t)+1.0v? is provided at the v in pin while maintaining a certain i out value.) note3. vdif = (v in 1 (note 4) ? v out (e)) note4. v in 1 = the input voltage at the time 98% of v out (e) is output (input voltage has been gradually reduced). typical performance characteristics output voltage vs. output current gs2911 (3.3v) gs2911 (5v) topr =25 85 -40 5. 1 4. 7 4. 8 4. 9 5. 0 0 20 40 60 80 100 120 140 160 180 output current: i out ( ma ) vin=6v cin=1 f(tantalum), cl=1 f(tantalum) output voltage:vout(v) 3. 4 3. 3 3. 2 3. 1 3. 0 0 20 40 60 80 100 120 140 160 180 topr =25 - 30 80 vin=4.3v cin=1 f(tantalum), cl=1 f(tantalum) output current iout (ma) output voltage:vout (v)
gs2911 globaltech semiconductor www.globaltechsemi.com 6 gs2911 output voltage vs. input voltage gs2911 (3.3v) gs2911 (5v) input/output voltage differential vs. output current gs2911 (3.3v) gs2911 (5v) 0 20 40 60 80 100 120 140 160 180 -0.2 0. 0 0. 2 0. 4 0. 6 0. 8 1. 0 topr =25 85 -40 c in =1 f( tant al um ), c l=1 f( tant al um ) output current : i out (ma) input/output voltage diff. :vdif (v) 0 20 40 60 80 100 120 140 160 180 -0.2 0. 0 0. 2 0. 4 0. 6 0. 8 1. 0 cin=1 f(tantalum), cl=1 f(tantalum) output current : i out (ma) input/output voltage diff. :vdif (v) topr =25 80 -30 10ma 40ma iout=1ma 2. 8 3. 3 3. 8 input voltage vin(v) o u t pu t v o lt age vout(v) 2. 5 2. 7 2. 9 3. 1 3. 3 3. 5 topr=25 cin=1 f(tantalum), cl=1 f(tantalum) 10ma 40ma iout=1ma 5. 2 5. 0 4. 8 4. 6 4. 4 4. 2 4. 5 5. 0 5. 5 topr=25 c in =1 f( tant al um ), c l=1 f( tant al um ) input voltage : v in (v) output voltage : v out (v) 10ma 40ma iout=1ma 56 7891 0 4. 85 4. 90 4. 95 5. 00 5. 05 5. 10 input voltage:v in ( v ) output voltage:v out (v) topr=25 f(tantalum), cl=1 f(tantalum ) 40ma iout=1ma,10ma 345678910 3. 15 3. 20 3. 25 3. 30 3. 35 3. 40 input voltage vin (v) topr=25 cin=1 f(tantalum), cl=1 f(tantalum) output voltage vout (v)
gs2911 globaltech semiconductor www.globaltechsemi.com 7 gs2911 supply current vs. input voltage gs2911 (3.3v) gs2911 (5v) load transient response gs2911 (3.3v) gs2911 (5v) 0246810 0 1 2 3 input voltage:v in (v) supply current:iss( a) topr =25 85 -40 topr =25 80 -30 345678910 1. 50 1. 75 2. 00 2. 25 2. 50 input voltage vin(v) supply current iss( a) time(2msec/div) 2 3 4 5 6 7 0 40 80 120 160 200 output voltage:v out (v) output current:i out (ma) vin=6v, cl=1 f(tantalum) output voltage output current 40ma 1ma ti me( 2msec/ di v) 0. 3 1. 3 2. 3 3. 3 4. 3 5. 3 0 40 80 120 160 200 output voltage:v out (v) output current:i out (ma) vin=4.3v, cl=1 f(tantalum) output voltage output current 40ma 1ma
gs2911 globaltech semiconductor www.globaltechsemi.com 8 gs2911 typical application circuits vin 1uf (trantalum) 1uf (trantalum ) vin vout vss v a vin vout vss vin a open notes on use 1. there is a possibility that oscillation may occur as a result of the impedance present between the power supply and the ic ?s input. where impedance is 10 ? or more, please use a capacitor (c in ) of at least 1f. with a large output current, operations can be stabilised by increasing capacitor size (c in ). if c in is small and capacitor size (cl) is increased, there is a possibility of oscillation due to input impedance. in such cases, either increasing the size of c in or decreasing the size of cl can stabilize operations. 2. please ensure that output current (i out ) is less than p d + (v in - v out ) and does not exceed the stipulated continuous total power dissipation value (p d ). 3. should you wish to increase output current (i out ) and/or have the capability to exceed the stipulated p d value, using a current boost circuit (sim ilar to the one shown below) is likely to lead to oscillation. with such applications, we recommend use of a boost type voltage regulator, such as the gs2911 series.
gs2911 globaltech semiconductor www.globaltechsemi.com 9 gs2911 package dimension sot-89 plastic package dimensions in millimeters dimensions in inches symbol min max min min a 1.450 1.550 0.570 0.061 b 0.440 0.480 0.017 0.019 c 0.360 0.400 0.014 0.016 e 4.450 4.550 0.175 0.179 e2 1.500 1.700 0.059 0.067 e3 1.400ref 0.055ref e 1.500bsc 0.059bsc e1 3.000bsc 0.118bsc h 4.150 4.250 0.163 0.167 d 2.450 2.550 0.096 0.100 l 0.900 1.100 0.035 0.043
gs2911 globaltech semiconductor www.globaltechsemi.com 10 gs2911 to-92 plastic package 0+1.0 0+1.0 21.0max 16 0.5 9.0+0.5 4.0 0.2 12.7 0.3 6.35 0.5 2.5+0.4 or 2.5-0.1 1.0max 6.0 0.5 18.0+1.6 or 18.0-0.5
gs2911 globaltech semiconductor www.globaltechsemi.com 11 gs2911 information furnished is believed to be accurate and reliable. however globaltech semiconductor assumes no responsibility for the consequences of us e of such information nor for any infringement of patents or other rights of third parties, which may result from its use. no license is granted by implication or otherwise under any patent or patent rights of gl obaltech semiconductor. specifications mentioned in this publication are subject to change without notice. this publication supersedes and replaces all information without express written approval of globaltech semiconductor.

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