CAT102 Datasheet, PDF (1/9 Pages) Catalyst Semiconductor – Precision, Adjustable Shunt Regulator (600mV Reference)

CAT102
Precision, Adjustable Shunt Regulator (600mV Reference)
- +1% Initial Accuracy
- SOT23 Package
FEATURES
s Low voltage reference: 600mV
s Low temperature coefficient reference: 25ppm
s Accurate 600mV reference voltage:
+6mV at T_J=25°C
s High PSRR: 45dB at 300kHz
s High line rejection: +1mV (V from 2.2V to 18V)
CC
s Low supply current: 300µA
s Open collector output
s Directly drives optocouplers
s Compact 5-lead SOT23 package
s Industrial temperature range: -40°C to 85°C
APPLICATIONS
s SMPS control loop
s Low temperature coefficient voltage reference
s Power management
s Replaces zener diodes
s Isolated DC-to-DC converters
s Network, telecom and cellular base station
power supplies
s Adjustable voltage reference
DESCRIPTION
The CAT102 is a low-voltage reference and amplifier.
Designed for the control loop of low-voltage power
supplies, the reference voltage has been designed for
600mV. Over a junction temperature from -40°C to
105°C the reference voltage is within 8mV of the nominal
600mV. In addition, the error amplifier output and the
supply voltage pin are on separate pins.
Power supply rejection is a high 45dB at 300kHz. The
output, OUT, can sink 20mA at a maximum saturation
voltage of 250mV.
When combined with an optocoupler, the CAT102 can
be used as an error amplifier that controls the feedback
loop in isolated low-output voltage switching power
supplies.
FUNCTIONAL DIAGRAM
1
FB
Error
Amplifier
IN
5
+
VREF
–
+
–
600mV
OUT
3
PIN CONFIGURATION
SOT23-5
TOP VIEW
FB 1
5 IN
GND 2
OUT 3
4 NC
2
GND
© 2003 by Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
1
Doc. No. 4007, Rev. L