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SC4431_03 Datasheet

  • SC4431_03

  • Shunt Regulator With Open Collector Output

  • 8頁

  • SEMTECH   SEMTECH

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Shunt Regulator With
Open Collector Output
POWER MANAGEMENT
Description
The SC4431 is a four terminal device for regulating an
isolated power supply with output voltages down to 1.5V.
It is intended to be used as a replacement for three
terminal shunt regulators such as SC431L where the
output voltage is too low for the device to function in
conjunction with an opto-isolator. SC4431 achieves this
by having seperate supply and output pins, allowing the
output to sink current at voltages as low as 0.1V, while
the supply pin still has sufficient voltage for the device to
function. In this way, allowing for a 1.4V drop through an
opto-isolator diode, regulation down to 1.5V out can be
achieved.
The SC4431 shunt regulator is available with three
initial reference voltage accuracies (0.5%, 1.0% and
2.0%) in the space saving 5-lead SOT-23 package. The
three voltage tolerances allow the designer the
opportunity to select the proper cost/tolerance for their
application.
SC4431
Features
Open Collector output drives Optoisolator with
as little as 1.5V input voltage
Trimmed bandgap design - initial accuracies
to + 0.5%
40mA drive capability
Regulates output as low as 50mV
Wide supply voltage range - 1.5V to 15V
Low supply current - typically 110碌A(chǔ)
Full industrial temperature range
SOT-23 5 lead package
Applications
Telecom Power Supplies
Opto driver for very low output voltage (1.5V)
isolated power supplies
Battery operated applications
Point of use power supplies
Typical Application Circuit
2V Output Isolated Power Supply
T1
VIN
Primary Side
Controller
Secondary Side
Rectification
and Filtering
R1
R2
5.1k
C1
2V OUT
U1
C3
SC4431
1
VCC
33nF
R3
6.34k
5
4N25
C2
22nF
OUT
4
REF
R4
10k
3
NC
2 GND
Revision September 9 ,2003
1
www.semtech.com

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