MICROELECTRONICS
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A
Power Management
GM431
2.5V ADJUSTABLE SHUNT REGULATOR
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
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 (V
ref
)
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 T
A
= 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.
Application
Switching power supplies
Linear regulators
Adjustable supplies
Battery-operated computers
Computer disk drives
Instrumentation
LOGIC SYMBOL
BLOCK DIAGRAM (POSITIVE LOGIC)
CATHODE
REFERENCE
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CATHODE
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www.gammamicro.com
GM431
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GAMMA [ GAMMA MICROELECTRONICS INC. ]
