LM2937-25 National Semiconductor, LM2937-25 Datasheet

LM2937-25

Manufacturer Part Number

LM2937-25

Description

400mA and 500mA Voltage Regulators

Manufacturer

National Semiconductor

Datasheet

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LM2937-2.5, LM2937-3.3

400mA and 500mA Voltage Regulators

General Description

The LM2937-2.5 and LM2937-3.3 are positive voltage regu-

lators capable of supplying up to 500 mA of load current.

Both regulators are ideal for converting a common 5V logic

supply, or higher input supply voltage, to the lower 2.5V and

3.3V supplies to power VLSI ASIC’s and microcontrollers.

Special circuitry has been incorporated to minimize the qui-

escent current to typically only 10 mA with a full 500 mA load

current when the input to output voltage differential is greater

than 5V.

The LM2937 requires an output bypass capacitor for stabil-

ity. As with most regulators utilizing a PNP pass transistor,

the ESR of this capacitor remains a critical design param-

eter, but the LM2937-2.5 and LM2937-3.3 include special

compensation circuitry that relaxes ESR requirements. The

LM2937 is stable for all ESR ratings less than 5 . This al-

lows the use of low ESR chip capacitors.

The regulators are also suited for automotive applications,

with built in protection from reverse battery connections,

Connection Diagram and Ordering Information

Order Number LM2937ET-2.5, LM2937ET-3.3,

See NS Package Number T03B

TO-220 Plastic Package

Front View

Top View

DS100113

Order Number LM2937ES-2.5, LM2937ES-3.3,

DS100113-24

DS100113-26

TO-263 Surface-Mount Package

See NS Package Number TS3B

two-battery jumps and up to +60V/−50V load dump tran-

sients. 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 (400mA for

n Output trimmed for 5% tolerance under all operating

n Wide output capacitor ESR range, 0.01

n Internal short circuit and thermal overload protection

n Reverse battery protection

n 60V input transient protection

n Mirror image insertion protection

SOT-223 package)

conditions

Order Number LM2937IMP-2.5, LM2937IMP-3.3,

See NS Package Number MA04A

SOT-223 Plastic Package

Front View

Side View

DS100113-27

DS100113-25

up to 5

February 1998

www.national.com

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