CAT102 Datasheet, PDF (1/8 Pages) Catalyst Semiconductor – Precision, Adjustable Shunt Regulator (600mV Reference)

Precision, Adjustable Shunt Regulator
(600 mV Reference)
CAT102
FEATURES
„ 600 mV low voltage reference
„ ±6 mV initial accuracy
„ High PSRR: 45 dB at 300 kHz
„ Better line regulation: 1 mV (V_IN from 2.2 V to 18 V)
„ Low supply current: 90 µA
„ Open drain output
„ Directly drives optocouplers
„ Industrial temperature range of -40ºC to 85ºC
„ RoHS-compliant 5-lead TSOT23 package
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
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
600 mV. Over a temperature from -40°C to 85°C, the
reference voltage is within 8 mV 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 45 dB at 300 kHz.
The output, OUT, can sink 20 mA at a maximum
saturation voltage of 250 mV.
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.
For Ordering Information details, see page 7.
FUNCTIONAL DIAGRAM
1
FB
Error
Amplifier
V_{REF +}
–
600mV
IN
5
+
–
OUT
3
2
GND
PIN CONFIGURATION
TSOT-23 5L
Top View
FB 1 1
GND 2 2
OUT 4 3
5 8 IN
4 5 NC
PIN DESCRIPTION
Pin Name
FB
GND
OUT
NC
IN
Function
Inverting input to error amplifier
Ground
Output of error amplifier. Source & sink
current capability is 20 mA.
No connection
Positive supply
© 2009 SCILLC. All rights reserved.
1
Characteristics subject to change without notice
Doc. No. MD-4007 Rev. P