ADJUSTABLE PRECISION
ZENER SHUNT REGULATOR
Issue 1 - NOVEMBER 1998
ZR431L
DEVICE DESCRIPTION
FEATURES
The ZR431L is a three terminal adjustable
shunt regulator offering excellent
temperature stability and output current
handling capability up to 25mA. The output
voltage may be set to any chosen voltage
between 1.24 and 10 volts by selection of
two external divider resistors.
Surface mount SOT23 package
TO92 package
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2.5% and 1% tolerance
Maximum temperature coefficient 50
ppm/°C
Temperature compensated for
operation over the full temperature
range
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The devices can be used as a replacement
for zener diodes in many applications
requiring an improvement in zener
performance.
Programmable output voltage
100µA to 25mA current sink capability
Low output noise
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The ZR431L is particularly used in the
feedback control loop of switch mode power
supplies. In this application the device 1.24
volt reference enables the generation of low
voltage supplies, typically 3.3 volts or 3volts.
APPLICATIONS
Shunt regulator
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Series regulator
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Voltage monitor
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Over voltage/ under voltage protection
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Switch mode power supplies
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SCHEMATIC DIAGRAM
VZ
Vref
Gnd
