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GM431

2.5V ADJUSTABLE SHUNT REGULATOR

Gamma Microelectronics Inc. 

AA

MICROELECTRONICS

Power Management

GM431

2.5V ADJUSTABLE SHUNT REGULATOR

Description

The GM431 is a three terminal adjustable shunt regulator

with thermal stability guaranteed over temperature. Output

voltage can be adjusted to any value between 2.5V (Vref)

and 36V by using two external resistors. The GM431 has a

typical dynamic output impedance of 0.2W. Active output

circuitry provides a very unique turn on characteristic, mak-

ing the GM431 an excellent replacement for zener diodes

in many applications such as onboard regulation and ad-

justable power supplies. The GM431 is an ideal voltage ref-

erence for 3.0 to 3.3V switching power supplies.

The GM431 shunt regulator is available with 3 voltage tol-

erances 0.5%, 1.0% and 2.0% over TA= 0°C to + 70°C,

and four package options (SOT-23, TO-92, SOT-89 and

SOP-8). Whatever your application is, the GM431 offers

the optimum combination of performance, reliability, and

economy.

Features

Sink Current Capability 1 mA to 100mA

Low dynamic output impedance, 0.2W typ.

Low output noise

0.5%, 1% or 2% reference voltage tolerance

Alternate for TL431, TL431, LM431 & AS431

Temperature range 0°C to+ 70 °C

Available in SOT-23, TO-92, SOT-89 and

SOP- 8 packages

Application

Switching power supplies

Linear regulators

Adjustable supplies

LOGIC SYMBOL

REFERENCE

ANODE

CATHODE

Battery-operated computers

Computer disk drives

Instrumentation

BLOCK DIAGRAM (POSITIVE LOGIC)

CATHODE

REFERENCE

+

_

V ref

ANODE

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