?2001 fairchild semiconductor corporation www.fairchildsemi.com rev. 1.0.0 features ? limited input voltage and high efficiency. ? internal thermal over load protection. ? 60v load dump protection. ? output current up to 0.1a. description lm2931a is a fixed 3-terminal low dropout voltage regulator designed to need very low quiescent current. internally, implemented circuits include 60v load dump protection, -50v reverse transient short circuit and thermal over load protection. to-92 1: output 2: gnd 3: input 1 internal block diagram 0.6v max drop v o v i 3 2 1 gnd _ + thermal shutdown start over voltage protection current limit reference voltage pass element input output lm2931a low dropout voltage regulator
lm2931a 2 absolute maximum ratings electrical characteristics (v i =14v, i o =10ma, c o =100 f, t a = 25 o c) parameter symbol value unit input voltage vi 33 v over protection voltage v (op) 60 v operating temperature range t opr -40~+125 c maximum junction temperature t j 150 c storage temperature range t stg -65~+150 c parameter symbol conditions min. typ. max. unit output voltage (i) v o (i) v i = 14v, i o = 10ma 4.81 5.0 5.19 v output voltage (ii) v o (ii) v i = 6 ~ 26v, i o = 100ma t j = -40 ~ +125 o c 4.75 5.0 5.25 v line regulation (i) ? v o (i) v i = 9 ~ 16v, i o = 10ma - 2.0 10 mv line regulation (ii) ? v o (ii) v i = 6 ~ 26v, i o = 10ma - 4.0 30 mv load regulation ? v o (iii) v i = 14v, i o = 5 ~ 100ma - 10 50 mv output impedance z o v i = 14v, i o = 100ma - 100 600 m ? quiescent current (i) i q (i) v i = 6 ~ 26v, i o 10ma - 0.1 1.0 ma quiescent current (ii) i q (ii) v i = 14v, i o 100ma - 5.0 30 ma output noise voltage v n v i = 14v, i o = 10ma, f = 10hz ~ 100khz - 150 1000 vrms ripple rejection rr v i = 14v, i o = 10ma, f = 120hz 55 80 - db dropout voltage (i) v d (i) i o = 10ma, v d = v i - v o -0.030.2 v dropout voltage (ii) v d (ii) i o = 100ma, v d = v i - v o -0.10.6v max operational input voltage v in i o = 10ma 26 33 - v max line transient v lt(max) v i = 14v, i o =10ma, time =100ms 60 70 - v reverse polarity input voltage dc v i(dc) v i = 14v, i o = 10ma, v o -0.3v - 15 - 30 - v reverse polarity input voltage transient v i(tr) v i = 14v, i o = 10ma, time 10ms - 50 - 80 - v peak output current i pk v i = 14v 200 400 600 ma
lm2931a 3 typical perfomance characteristics figure 1. output voltage vs. input voltage figure 3. ripple rejection vs. output voltage figure 5. output voltage vs. temperature(tj) figure 2. quiescent current vs. input voltage figure 4. drop voltage vs. output current figure 6. quiescent current vs. temperature(tj) fig.1 output voltage vs. input voltage input voltage vin (v) 6 5 4 3 2 1 7 0 0 5 10 15 output voltage vo(v) fig.3 ripple rejection vs. output voltage output current ( ? ) 90 85 75 65 ripple rejection ratio( ? ) 0 20 40 60 80 100 v in = 14v v out = 5.0v f = 120 ? t j = 25 fig.5 output voltage vs. temperature(tj) temperature tj( ) 5.04 5.02 5.00 5.06 -25 outout voltage vo(v) 75 125 02550 100 4.96 4.94 4.92 4.98 fig.2 quiescent vs. input voltage input voltage vin (v) 10 8.0 6.0 4.0 2.0 0 quiescent current iq(ma) r l = 50 ? 0 10 20 30 40 50 r l = 500 ? output current ( ? ) fig.4 drop voltage vs. output current 120 240 200 160 120 0 dropout voltage vdrop( ? ) 80 40 80 20 40 60 100 0 vin = 14v v out = 100 ? t j = 25 fig.6 quiescent current vs. temperature(tj) junction temperature tj( ) 1 0.8 0.6 0.4 0.2 0 quiescent current iq(ma) 75 125 02550 100 -25
lm2931a 4 typical application figure 1. application circuit ? ci is required if regulator is located an appreciable distance from power supply filter. ? co improves stability . ka76l05 v i v o co 0.1 f 3 1 2 c i 100 f i q lm2931a
lm2931a 5 mechanical dimensions package dimensions in millimeters 0.46 0.10 1.27typ (r2.29) 3.86max [1.27 0.20 ] 1.27typ [1.27 0.20 ] 3.60 0.20 14.47 0.40 1.02 0.10 (0.25) 4.58 0.20 4.58 +0.25 ?.15 0.38 +0.10 ?.05 0.38 +0.10 ?.05 to-92
lm2931a 6 ordering information product number package operating temperature lm2931az5 to-92 -40 c to + 125 c
lm2931a 7
lm2931a 5/19/01 0.0m 001 stock#dsxxxxxxxx ? 2001 fairchild semiconductor corporation life support policy fairchild?s products are not authorized for use as critical components in life support devices or systems without the express written approval of the president of fairchild semiconductor corporation. as used herein: 1. life support devices or systems are devices or systems which, (a) are intended for surgical implant into the body, or (b) support or sustain life, and (c) whose failure to perform when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in a significant injury of the user. 2. a critical component in any component of a life support device or system whose failure to perform can be reasonably expected to cause the failure of the life support device or system, or to affect its safety or effectiveness. www.fairchildsemi.com disclaimer fairchild semiconductor reserves the right to make changes without further notice to any products herein to improve reliability, function or design. fairchild does not assume any liability arising out of the application or use of any product or circuit described herein; neither does it convey any license under its patent rights, nor the rights of others.
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