unisonic technologies co., ltd LM2937 linear integrated circuit www.unisonic.com.tw 1 of 10 copyright ? 2013 unisonic technologies co., ltd qw-r102-012.i 500m a lo w dropout voltage regulator ? description the utc LM2937 is a positive voltage regul ator capable of supplying up to 500ma of load current. the use of a pnp power transistor provides a low dropout voltage char acteristic. with a load current of 500ma the minimum input to output voltage differential required for the output to remain in regulation is typically 0.5v(1v guaranteed maximum over the full operating temperature range). special circuitry has been incorporated to minimize the quiescent current to typically only 10ma with a full 500ma load current wh en the input to output voltage differential is greater than 3v. the utc LM2937 requires an output bypass capacitor for stability. as with most low dropout regulators, the esr of this capacitor remains a critical design parameter, but the LM2937 includes special compensation circuitry that relaxes esr requirements. the utc LM2937 is stable for all esr below 3 ? .this allows the use of low esr chip capacitors. ideally suited for automotiv e applications, the utc LM2937 will protect itself and any load circuitr y from reverse battery connections, two-battery jumps and up to +60v/-50v load dump transients. familiar regulator features such as short ci rcuit and thermal shutdown protection are also built in. ? features * fully specified for operation over -40 ? c~ +125 ? c * output current in excess of 500ma * output trimmed for 5% toleranc e under all operating conditions * typical dropout voltage of 0.5v at full rated load current * wide output capacitor esr range, up to 3 ? * reverse battery protection * internal short circuit and thermal overload protection * 60v input transient protection * mirror image insertion protection * built-in on/off control function ? ordering information order number package packing lead free halogen free LM2937l-xx-aa3-r LM2937g-xx-aa3-r sot-223 tape reel LM2937l-xx-ta3-t LM2937g-xx-ta3-t to-220 tube LM2937l-xx-tq2-r LM2937g-xx-tq2-r to-263 tape reel LM2937l-xx-tq2-t LM2937g-xx-tq2-t to-263 tube LM2937l-xx-tq3-r LM2937g-xx-tq3-r to-263-3 tape reel LM2937l-xx-tq3-t LM2937g-xx-tq3-t to-263-3 tube LM2937l-xx-tq5-r LM2937g-xx-tq5-r to-263-5 tape reel LM2937l-xx-tq5-t LM2937g-xx-tq5-t to-263-5 tube
LM2937 linear integrated circuit unisonic technologies co., ltd 2 of 10 www.unisonic.com.tw qw-r102-012.i ? ordering information (cont.) ? pin configuration pin no. pin name sot-223/to-220 to-263/to-263-3 to-263-5 1 4 input 2 3 gnd 3 5 output - 1 n/c - 2 on/off ? marking information package voltage code marking to-220 to-263 to-263-3 33 :3.3v 50 :5.0v 80 :8.0v 10 :10v 12 :12v 15 :15v sot-223 to-263-5
LM2937 linear integrated circuit unisonic technologies co., ltd 3 of 10 www.unisonic.com.tw qw-r102-012.i ? absolute maximum ratings (note 1) parameter symbol ratings unit input voltage v in 26 v power dissipation(note 2) p d internally limited maximum junction temperature t j +150 ? c storage temperature t stg -40 ~ +150 ? c note 1 . absolute maximum ratings indicate limits beyond wh ich damage to the device may occur. electrical specifications do not apply when operating the device outside of it s rated operating conditions. 2 . the maximum allowable power dissipation at any ambient temperature is p max = (125-t a )/ ja , where 125 is the maximum junction temperature for operation, t a is the ambient temperature, and ja is the junction to ambient thermal resistance. if this dissipation is exceeded, the die temperature will rise above 125 ? c and the electrical specificati ons do not apply. if the die temperature rises above 150 ? c, the LM2937 will go into thermal shutdown. ? thermal data parameter symbol ratings unit junction to ambient sot-223 ja 174 ? c/w to-220 65 to-263/ to-263-5 73 junction to case sot-223 jc 15 to-220 3 to-263/ to-263-5 4 ? electrical characteristics (v in =v nom +5v, i out =500ma, c out =10 f, t j =ta=25 ? c, unless otherwise specified.) for LM2937-3.3v parameter symbol test conditions min typ max unit output voltage v out 5ma i out 500ma 3.21 3.30 3.39 v line regulation v out v out +2v v in 26v, i out =5ma 9 30 mv load regulation v out 5ma i out 500ma 3 30 mv quiescent current i q (v o +2v) v in 26v, i out =5ma 2 10 ma v in = v out +5v, i out =500ma 10 20 ma output noise voltage en 10hz-100khz, i out =5ma 100 vrms long term stability 1000hrs 12 mv dropout voltage v d i out =500ma 0.5 1.0 v i out =50ma 110 250 mv short circuit current i sc 0.6 1.0 a peak line transient voltage t in t f 100ms, r l =100 ? 60 75 v reverse dc input voltage v rin v out -0.6v, r l =100 ? -15 -30 v reverse transient input voltage v trri t f <1ms, r l =100 ? -50 -75 v
LM2937 linear integrated circuit unisonic technologies co., ltd 4 of 10 www.unisonic.com.tw qw-r102-012.i ? electrical characteristics (cont.) for LM2937 - 5.0v parameter symbol test conditions min typ max unit output voltage v out 5ma i out 500ma 4.85 5.00 5.15 v line regulation v out v out +2v v in 26v, i out =5ma 15 50 mv load regulation v out 5ma i out 500ma 5 50 mv quiescent current i q (v out +2v) v in 26v, i out =5ma 2 10 ma v in = v out +5v, i out =500ma 10 20 ma output noise voltage en 10hz-100khz, i out =5ma 150 vrms long term stability 1000hrs 20 mv dropout voltage v d i out =500ma 0.5 1.0 v i out =50ma 110 250 mv test conditions min typ max unit 0.6 1.0 a tf 100ms, rl=100 ? 60 75 v vout -0.6v, rl=100 ? -15 -30 v tf<1ms, rl=100 ? -50 -75 v for LM2937-8.0v parameter symbol test conditions min typ max unit output voltage v out 5ma i out 500ma 7.76 8.00 8.24 v line regulation v out v out +2v v in 26v, i out =5ma 24 80 mv load regulation v out 5ma i out 500ma 8 80 mv quiescent current i q (v out +2v) v in 26v,i out =5ma 2 10 ma v in = vo+5v, i out =500ma 10 20 ma output noise voltage en 10hz-100khz, i out =5ma 240 vrms long term stability 1000hrs 32 mv dropout voltage v d i out =500ma 0.5 1.0 v i out =50ma 110 250 mv short circuit current i sc 0.6 1.0 a peak line transient voltage t in t f 100ms, r l =100 ? 60 75 v reverse dc input voltage v rin v out -0.6v, r l =100 ? -15 -30 v reverse transient input voltage v trri t f <1ms, r l =100 ? -50 -75 v for LM2937-10.0v parameter symbol test conditions min typ max unit output voltage v out 5ma i out 500ma 9.70 10.00 10.30 v line regulation v out v out +2v v in 26v, i out =5ma 30 100 mv load regulation v out 5ma i out 500ma 10 100 mv quiescent current i q (v out +2v) v in 26v,i out =5ma 2 10 ma v in = v out +5v, i out =500ma 10 20 ma output noise voltage en 10hz-100khz, i out =5ma 300 vrms long term stability 1000hrs 40 mv dropout voltage v d i out =500ma 0.5 1.0 v i out =50ma 110 250 mv short circuit current i sc 0.6 1.0 a peak line transient voltage t in t f 100ms ,r l =100 ? 60 75 v reverse dc input voltage v rin v out -0.6v ,r l =100 ? -15 -30 v reverse transient input voltage v trri t f <1ms ,r l =100 ? -50 -75 v
LM2937 linear integrated circuit unisonic technologies co., ltd 5 of 10 www.unisonic.com.tw qw-r102-012.i ? electrical characteristics (cont.) for LM2937-12.0v parameter symbol test conditions min typ max unit output voltage v out 5ma i out 500ma 11.64 12.00 12.36 v line regulation v out v out +2v v in 26v, i out =5ma 36 120 mv load regulation v out 5ma i out 500ma 12 120 mv quiescent current i q (v out +2v) v in 26v,i out =5ma 2 10 ma v in = v out +5v, i out =500ma 10 20 ma output noise voltage en 10hz-100khz, i out =5ma 360 vrms long term stability 1000hrs 44 mv dropout voltage v d i out =500ma 0.5 1.0 v i out =50ma 110 250 mv short circuit current i sc 0.6 1.0 a peak line transient voltage t in t f 100ms, r l =100 ? 60 75 v reverse dc input voltage v rin v out -0.6v, r l =100 ? -15 -30 v reverse transient input voltage v trri t f <1ms, r l =100 ? -50 -75 v for LM2937-15.0v parameter symbol test conditions min typ max unit output voltage v out 5ma i out 500ma 14.55 15.00 15.45 v line regulation v out v out +2v v in 26v, i out =5ma 45 150 mv load regulation v out 5ma i out 500ma 15 150 mv quiescent current i q (v out +2v) v in 26v,i out =5ma 2 10 ma v in = v out +5v, i out =500ma 10 20 ma output noise voltage en 10hz-100khz, i out =5ma 450 vrms long term stability 1000hrs 56 mv dropout voltage v d i out =500ma 0.5 1.0 v i out =50ma 110 250 mv short circuit current i sc 0.6 1.0 a peak line transient voltage t in t f 100ms, r l =100 ? 60 75 v reverse dc input voltage v rin v out -0.6v, r l =100 ? -15 -30 v reverse transient input voltage v trri t f <1ms, r l =100 ? -50 -75 v ? on/off control (for 5 pins only) parameter symbol test conditions min typ max unit on/off threshold voltage on v on i out Q 0.5a 0.8 v on/off threshold voltage off v off i out Q 0.5a 2.0 v on/off threshold current i on/off v on/off =2.0v, i out =0.5a 50 100 a
LM2937 linear integrated circuit unisonic technologies co., ltd 6 of 10 www.unisonic.com.tw qw-r102-012.i ? typical application ? on/off control application * required if the regulator is located more than 3 inches from the power supply filter capacitors. **required for stability. c out must be at least 10 f (over the full expected operati ng temperature range) and located as close as possible to the regulator. the equivalent seri es resistance, esr, of this capacitor may be as high as 3 ? .
LM2937 linear integrated circuit unisonic technologies co., ltd 7 of 10 www.unisonic.com.tw qw-r102-012.i ? typical characteristics 0 200 0.4 output current (ma) dropout voltage vs output current dropout voltage ( v) 300 0.2 0.3 0.5 0.1 100 400 500 0 0.6 0.7 0.8 0.9 t j =25 -40 40 0.4 dropout voltage vs temperature dropout voltage (v) 80 0.2 0.3 0.5 0.1 0120 0 0.6 0.7 0.8 0.9 0.5a 1.0 temperature () 0.25a 0.05a -40 40 4.98 output voltage vs temperature output voltage (v) 80 4.94 4.96 5.00 4.92 0 120 4.90 5.02 5.04 5.06 5.08 5.10 temperature () -40 40 10 quiescent current vs temperature quiescent current (ma) 80 5 0120 0 15 20 temperature () 250ma 500ma 5ma r l =100 0 10 20 quiescent current vs input voltage quiescent current (ma) 15 10 5 20 25 0 30 40 50 input voltage (v) 0.25a 0.05a 30 35 60 70 80 90 100 0.5a 0200 4 quiescent current (ma) 300 1 100 400 500 0 6 8 10 output current (ma) v in =14v v out =5v t j =25 v out =5v t a =25 quiescent current vs input voltage 2 5 3 7 9
LM2937 linear integrated circuit unisonic technologies co., ltd 8 of 10 www.unisonic.com.tw qw-r102-012.i ? typical characteristics(cont.) -10 10 line transient response 20 -20 0 3v 03040 0v 20 40 100 ripple rejection ripple rejection (db) 1k 40 50 10 10k 100k 60 70 frequency (hz) 1.0 3.0 low voltage behavior output voltage (v) 4.0 2.0 2.0 5.0 6.0 1.0 3.0 4.0 5.0 input voltage (v) 0 4 6 2 2 8 10 0 4 6 input voltage (v) 12 14 8 10 12 14 50 60 load transient response load current (a) i out =50ma v out =5 v t a =25 time ( s) 1m i out =500ma v out =5 v t j =25 output voltage (v) low voltage behavior i out =500ma t j =25 0 6 3 3 9 12 0 6 input voltage (v) 15 18 9 12 15 18 output voltage (v) low voltage behavior v out =15 v t j =25 input voltage change (v) output voltage deviation (mv) time ( s) -1 1 2 -50 0 400 034 0 50 56 output voltage deviation (mv) v in =10v v out =5 v i out =50ma c out =10 f 0 0 v out =10v v out =8 v i out =500ma v out =12 v
LM2937 linear integrated circuit unisonic technologies co., ltd 9 of 10 www.unisonic.com.tw qw-r102-012.i ? typical characteristics(cont.) output impedance 0 200 100 300 0.01 0.1 1 output current (ma) 400 500 10 100 equivalent series resistance ( ) output capacitor esr v out =5v -30 -10 0 0 -20 10 20 -2 2 6 input voltage (v) 30 40 8 10 12 output voltage (v) output at voltage extremes r l =100 v out =10v -30 -10 0 0 -20 10 20 -4 4 8 input voltage (v) 30 40 12 16 20 output voltage (v) output at voltage extremes r l =100 v out =12v c out =10 f -40 0 40 80 0 0.5 temperature ( ) 120 1.0 1.5 output current (a) peak output current v in =14v output impedance ( ) 4 v out =8v v out =5v v out =15v 100 1k 0.01 0.1 10 10k 100k 1.0 10 frequency (hz) 1m v in =14v v out =5 v i out =25ma c out =10 f stable region
LM2937 linear integrated circuit unisonic technologies co., ltd 10 of 10 www.unisonic.com.tw qw-r102-012.i utc assumes no responsibility for equipment failures that result from using products at values that exceed, even momentarily, rated values (such as maximum ratings, oper ating condition ranges, or other parameters) listed in products specificati ons of any and all utc products described or contained herein. utc products are not designed for use in life support appliances, devices or systems where malfunction of these products can be reasonably expect ed to result in personal injury. reproduction in whole or in part is prohibited without the prior wr itten consent of the copyright owner. the information presented in this document does not form part of any quotation or contract, is believed to be accurate and reliable and may be changed without notice.
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