utc LM2954 linear integrated circuit utc unisonic technologies co., ltd. 1 qw-r102-002,d 300 ma low-dropout voltage regulator description the utc LM2954 is a monolithic integrated voltage regulator with low dropout voltage, and low quiescent current. it includes many features that suitable for different applications. available in 3-pin to-92, dip-8, sop-8 and sot-223 packages. features *high accuracy 3.3, 5v fixed output for to-92, dip-8 and sop-8 package. *extremely low quiescent current and dropout voltage. *extremely tight load and line regulation. *current and thermal limiting. *very low temperature coefficient. *logic controlled shutdown and error flag available for dip and sop package. *output voltage programmable for dip and sop package. applications *battery powered equipment. *high efficient linear regulator down to 1.24v. *cellular phones. to-92 sop-8 dip-8 1 sot-223 1
utc LM2954 linear integrated circuit utc unisonic technologies co., ltd. 2 qw-r102-002,d pin configurations 2 1 3 output gnd input utc LM2954 to-92 plastic package bottom view 1 2 3 4 8 7 6 5 input feedback 5v tap shutdown sense output utc LM2954 gnd error sop-8 or dip-8 package utc LM2954 input gnd output sot-223 package fig. 1
utc LM2954 linear integrated circuit utc unisonic technologies co., ltd. 3 qw-r102-002,d block diagram 5 4 6 2 1 8 7 3 60mv 330k ? to cmos or ttl 5v 150ma max. feedback input output sense 5v tap gnd error detection comparator error amplifier from cmos or ttl 1.23 ref shut down unragulated dc error 182k ? 60k ? 1.5 f absolute maximum ratings parameter symbol value unit supply voltage vcc -0.3 ~ +30 v feedback voltage vfeedback -1.5 ~ +30 v shutdown voltage vshutdown -0.3 ~ +30 v comparator output voltage vco -0.3 ~ +30 v storage temperature tstr -65 ~ +150 c operating junction temperature tj -40 ~ +125 c
utc LM2954 linear integrated circuit utc unisonic technologies co., ltd. 4 qw-r102-002,d electrical characteristics (tested at tj=25 c, v in =6v, i l =100 a and c l =1f. unless otherwise specified) parameter part number test conditions min. typ. max. unit output voltage utc LM2954-3.3 utc LM2954-5.0 utc LM2954 t j =25 c (note 1) 3.23 4.90 3.3 5.0 3.37 5.10 v utc LM2954-3.3 utc LM2954-5.0 utc LM2954 -25 c<=t j <=+85 c (note 1) 3.23 4.90 3.3 5.0 3.37 5.10 v utc LM2954-3.3 utc LM2954-5.0 utc LM2954 100 a<=i l <=300 ma tj<=tj(max) (note 1) 3.23 4.90 3.3 5.0 3.37 5.10 v output voltage temperature coefficient 20 100 ppm/ c line regulation 6v<=v in <=30v 0.1 0.2 % load regulation 100 a<=i l <=300 ma 0.2 0.5 % dropout voltage i l =100ma i l =200ma (note 2) 380 450 400 600 mv ground current i l =100 a i l =200ma 0.075 8 0.12 12 0.14 14 ma dropout ground current v in =4.5v,i l =100 a 110 170 200 a current limit vout=0 300 ma output noise 10hz to 100khz c l =1 f c l =200 f c l =3.3 f (bypass=0.01 f) pins 7 to ( utc 2954 ) 430 160 100 v for 8-pin version only reference voltage 1.22 1.235 1.25 v reference voltage (note 4) 1.19 1.27 v feedback pin bias current 20 40 na reference voltage temperature coefficient 50 ppm/ c feedback bias current temperature coefficient 0.1 na/ c error comparator output leakage current v oh =30v 1 a output low voltage v in =4.5v i ol =400 a 250 mv upper threshold voltage (note 3) 3.2 %v o lower threshold voltage (note 3) 7.6 %v o hysteresis (note 3) 15 mv shutdown input
utc LM2954 linear integrated circuit utc unisonic technologies co., ltd. 5 qw-r102-002,d parameter part number test conditions min. typ. max. unit input logic voltage low (regulator on) high (regulator off) 2.0 1.3 0.70 v shutdown pin input current v shutdown =2.4v 30 50 a v shutdown =30v 450 600 a regulator output current shutdown vshutdown>=2v,v in <=30v, v out =0, feedback pin tied to 5v tap. 3 10 a note 1: additional conditions for 8-pin versions are feedback tied to 5v tap an output tied to output sense (v out =5v) and vshutdown<=0.8v. note 2: dropout voltage is defined as the input to output differential at which the output voltage drops 100mv below its nominal value measured at 1v differential. note 3: comparator thresholds are expressed in terms of percentage value of voltage output. note 4: vref vout (vin-1v), 2.3v vin 30v, 100 a i l 100ma, t j t jmax application circuit (10a low dropout regulator) +v in fb vout gnd sd error utc LM2954 8 5 7 1 4 3 current limit section +v in =v ou t+0.5v 0.05 ? 470 ? 680 ? 4.7m ? 20k ? 220 ? 0.033 f 47 ? r1 r2 4.7 f 100 f 1% 10k ? 2n3906 + v out 10 a vout=1.23v*(1+r1/r2) for 5v output use internal resistors.wire pin 6 to 7 and wire pin 2 to +v out utc d65h0 fig.2
utc LM2954 linear integrated circuit utc unisonic technologies co., ltd. 6 qw-r102-002,d utc LM2954-3.3 utc LM2954-5.0 vin vout 1 f 1 f fig. 3
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