CAT102TBI

CAT102 Precision, Adjustable Shunt Regulator (600mV Reference) FEATURES Low voltage reference: 600mV Low temperature coefficient reference: 25ppm Accurate 600mV reference voltage: +6mV at TJ = 25ºC High PSRR: 45dB at 300kHz High line rejection: ±1mV (VCC from 2.2V to 18V) Low supply current: 300µA Open collector output Directly drives optocouplers Compact 5-lead SOT23 package Industrial temperature range: -40ºC to 85ºC 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. 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 11 22 43 4 5 NC 5 8 IN FB 1 VREF 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 © 2007 Catalyst Semiconductor, Inc. Characteristics subject to change without notice 1 Doc. No. 4007 Rev. M CAT102 ABSOLUTE MAXIMUM RATINGS(1) Parameters VIN Voltage OUT Voltage FB Voltage VIN, OUT, FB Current Operating Junction Temperature (10s) Lead Soldering Temperature (10s) Storage Temperature Range Ratings 20 20 20 50 150 260 -65 to +150 Units V V V mA ºC ºC ºC ELECTRICAL CHARACTERISTICS Electrical characteristics are guaranteed over the full operating temperature range of -40°C to +85°C with a junction temperature from -40°C to +105°C unless otherwise specified. Ambient temperature must be de-rated based upon power dissipation and package thermal characteristics.1 Unless otherwise stated, test conditions are VIN = 3V, FB = OUT, IOUT = 1mA. Symbol VIN IIN VFB Parameter Supply Voltage Range Quiescent Supply Current FB Threshold Reference Voltage Line Regulation Load Regulation TCREF IFB PSRR AV BW VOUT TRANSC ILEAK IOUT(MAX) Reference Temperature Deviation FB Input Current Reference Power Supply Rejection Error Amplifier Open Loop Gain Unity Gain Frequency Output Saturation voltage Output Transconductance Output Leakage Current Maximum Output Current Frequency = 300kHz IOUT = 2mA, VOUT = 1V IOUT = 2mA, VOUT = 1V IOUT = 20mA, VFB = HIGH IOUT = 1mA to 20mA VOUT = 16V, VFB = 0 VOUT = 0.3V 20 VOUT =1V TJ = 25˚ C -40ºC