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LM2937ES50NOPB 数据手册 - National Semiconductor（美国国家半导体）
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LM2937ES50NOPB数据手册
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LM2937
500 mA Low Dropout Regulator
General Description
The LM2937 is a positive voltage regulator capable of sup-
plying up to 500 mA of load current. The use of a PNP power
transistor provides a low dropout voltage characteristic. With
a load current of 500 mA 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 oper-
ating temperature range). Special circuitry has been incor-
porated to minimize the quiescent current to typically only
10 mA with a full 500 mA load current when the input to
output voltage differential is greater than 3V.
The LM2937 requires an output bypass capacitor for stabil-
ity. 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 LM2937 is stable for all ESR below
3Ω. This allows the use of low ESR chip capacitors.
Ideally suited for automotive applications, the 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
n Fully specified for operation over −40˚C to +125˚C
n Output current in excess of 500 mA
n Output trimmed for 5% tolerance under all operating
conditions
n Typical dropout voltage of 0.5V at full rated load current
n Wide output capacitor ESR range, up to 3Ω
n Internal short circuit and thermal overload protection
n Reverse battery protection
n 60V input transient protection
n Mirror image insertion protection
Connection Diagrams
TO-220 Plastic Package SOT-223 Plastic Package
01128002
Front View
01128026
Front View
TO-263 Surface-Mount Package
01128005
Top View
01128006
Side View
August 2005
LM2937 500 mA Low Dropout Regulator
© 2005 National Semiconductor Corporation DS011280 www.national.com
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