CAT102
Precision, Adjustable Shunt Regulator
(600mV Reference)
FEATURES
Low voltage reference: 600mV
Low temperature coefficient reference: 25ppm
Accurate 600mV reference voltage:
+6mV at T
J
= 25潞C
High PSRR: 45dB at 300kHz
High line rejection: 鹵1mV (V
CC
from 2.2V to 18V)
Low supply current: 300碌A(chǔ)
Open collector output
Directly drives optocouplers
Compact 5-lead SOT23 package
Industrial temperature range: -40潞C to 85潞C
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擄C to
105擄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.
APPLICATION
SMPS control loop
Low temperature coefficient voltage reference
Power management
Replaces zener diodes
Isolated DC-to-DC converters
Network, telecom and cellular base station
Adjustable voltage reference
For Ordering Information details, see page 8.
FUNCTIONAL DIAGRAM
IN
Error
Amplifier
+
PIN CONFIGURATION
OUT
3
5
SOT-23 5L
Top View
FB
GND
OUT
1
1
2
2
4
3
4
5
NC
5
8
IN
FB
1
V
REF
600mV
鈥?/div>
+
鈥?/div>
PIN DESCRIPTION
Pin Name
2
GND
Function
Inverting input to error amplifier
Ground
Output of error amplifier. Source & sink
current capability is 20mA.
No connection
Positive supply
FB
GND
OUT
NC
IN
漏 2007 Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
1
Doc. No. 4007 Rev. M
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