CAT102
Precision, Adjustable Shunt Regulator
(600mV Reference)
FEATURES
600mv low voltage reference
35ppm low temperature coefficient
±6mV initial accuracy
High PSRR: 45dB at 300kHz
Better line regulation: 1mV (V
IN
from 2.2V to 18V)
Low supply current: 90µA
Open drain output
Directly drives optocouplers
Industrial temperature range of -40ºC to 85ºC
RoHS-compliant 5-lead TSOT23 package
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 (IN) 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
FUNCTIONAL DIAGRAM
IN
Error
Amplifier
+
PIN CONFIGURATION
OUT
3
TSOT-23 5L
Top View
FB
GND
OUT
1
1
2
2
4
3
4
5
NC
5
8
IN
5
FB
1
V
REF
600mV
–
+
–
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
© Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
1
Doc. No. MD-4007 Rev. N
CATALYST [ CATALYST SEMICONDUCTOR ]
