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LM2937

更新时间： 2024-01-28 02:34:53
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500mA LOW DROPOUT VOLTAGE REGULATOR

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LM2937 数据手册

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UNISONIC TECHNOLOGIES CO., LTD  
LM2937  
LINEAR INTEGRATED CIRCUIT  
500mA LOW DROPOUT  
VOLTAGE REGULATOR  
DESCRIPTION  
The UTC LM2937 is a positive voltage regulator capable of supplying  
up to 500mA of load current. The use of a PNP power transistor  
provides a low dropout voltage characteristic. 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 when 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 3Ω.This allows the use of low ESR  
chip capacitors.  
Ideally suited for automotive applications, the UTC LM2937 will  
protect itself and any load circuitry from reverse battery connections,  
two-battery jumps and up to +60V/-50V load dump transients. Familiar  
regulator features such as short circuit and thermal shutdown protection  
are also built in.  
FEATURES  
* Fully specified for operation over -40C~ +125C  
* Output current in excess of 500mA  
* Output trimmed for 5% tolerance under all operating conditions  
* Typical dropout voltage of 0.5V at full rated load current  
* Wide output capacitor ESR range, up to 3ꢀ  
* 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  
LM2937L-xx-TA3-T  
LM2937L-xx-TQ2-R  
LM2937L-xx-TQ2-T  
LM2937L-xx-TQ3-R  
LM2937L-xx-TQ3-T  
LM2937L-xx-TQ5-R  
LM2937L-xx-TQ5-T  
LM2937G-xx-AA3-R  
LM2937G-xx-TA3-T  
LM2937G-xx-TQ2-R  
LM2937G-xx-TQ2-T  
LM2937G-xx-TQ3-R  
LM2937G-xx-TQ3-T  
LM2937G-xx-TQ5-R  
LM2937G-xx-TQ5-T  
SOT-223  
TO-220  
Tape Reel  
Tube  
TO-263  
Tape Reel  
Tube  
TO-263  
TO-263-3  
TO-263-3  
TO-263-5  
TO-263-5  
Tape Reel  
Tube  
Tape Reel  
Tube  
www.unisonic.com.tw  
1 of 10  
Copyright © 2013 Unisonic Technologies Co., Ltd  
QW-R102-012.I  
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