CAT102 Precision, Adjustable Shunt Regulator (600 mV Reference) FEATURES DESCRIPTION 600 mV low voltage reference 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. ±6 mV initial accuracy High PSRR: 45 dB at 300 kHz Better line regulation: 1 mV (VIN from 2.2 V to 18 V) Low supply current: 90 µA Open drain output 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. Directly drives optocouplers Industrial temperature range of -40ºC to 85ºC RoHS-compliant 5-lead TSOT23 package 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 For Ordering Information details, see page 7. Network, telecom and cellular base station Adjustable voltage reference PIN CONFIGURATION FUNCTIONAL DIAGRAM IN FB 1 5 Error Amplifier TSOT-23 5L Top View OUT 3 + VREF 600mV FB 1 1 GND 2 2 OUT 4 3 5 8 IN 4 5 NC – + – PIN DESCRIPTION Pin Name FB 2 GND © 2009 SCILLC. All rights reserved. Characteristics subject to change without notice 1 Function Inverting input to error amplifier GND Ground OUT Output of error amplifier. Source & sink current capability is 20 mA. NC No connection IN Positive supply Doc. No. MD-4007 Rev. P CAT102 ABSOLUTE MAXIMUM RATINGS (1) Parameters Ratings Units VIN Voltage 20 V OUT Voltage 20 V FB Voltage 20 V VIN, OUT, FB Current 50 mA Operating Junction Temperature (10 seconds) 150 ºC Lead Soldering Temperature (10 seconds) 260 ºC -65 to +150 ºC Storage Temperature Range ELECTRICAL CHARACTERISTICS Electrical characteristics are guaranteed over the full operating temperature range of -40°C to +85°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 = 3 V, FB = OUT, IOUT = 1 mA. Symbol Parameter VIN Supply Voltage Range IIN Quiescent Supply Current VFB FB Threshold Reference Voltage Line Regulation Load Regulation IFB Conditions Min Typ Max Units 18 V 90 500 µA 600 606 2.2 VOUT =1 V TJ = 25ºC 594 -40ºC < TJ < 85ºC VIN = 2.2 V to VIN =18 V VOUT = 0.6 V IOUT = 1 mA to 10 mA VOUT = 0.6 V 592 608 mV 0.5 1 mV 3 8 mV 500 nA FB Input Current Reference Power Supply Rejection Error Amplifier Open Loop Gain Frequency = 300 kHz 35 65 dB IOUT = 2 mA, VOUT = 1 V 60 80 dB Unity Gain Frequency IOUT = 2 mA, VOUT = 1 V 1 2 MHz Output Saturation voltage IOUT = 20 mA, VFB = HIGH 130 Output Transconductance IOUT = 1 mA to 20 mA 2.5 ILEAK Output Leakage Current VOUT = 16 V, VFB = 0 0.5 IOUT(MAX) Maximum Output Current VOUT = 0.3 V PSRR (3) AV BW (3) VOUT TRANSC (3) -500 20 250 mV mA/mV 2 µA mA Notes: (1) These are stress ratings only and functional operation is not implied. Exposure to absolute maximum ratings for prolongued time periods may affect device reliability. All voltages are with respect to ground. (2) Thermal Characteristics (ΘJA) of TSOT-23 5-lead: 255°C/W (3) This parameter is controlled by design and verified during product evaluation. It is not production tested. Doc. No. MD-4007 Rev. P 2 © 2009 SCILLC. All rights reserved. Characteristics subject to change without notice CAT102 TYPICAL PERFORMANCE CHARACTERISTICS Line Regulation (at 1mA) Load Regulation 6 0.35 Output Voltage Change (mV) Output Voltage Change (mV) 0.4 0.3 0.25 0.2 0.15 0.1 0.05 0 2 6 10 14 5 4 3 2 1 0 18 1 5 Supply Voltage (V) 20 Power-Supply Rejection Ratio vs. Frequency -50 92 -55 90 -60 88 PSRR (dB) Supply Current (µA) 15 Load Current (mA) Supply current vs. Input Voltage 86 84 -65 -70 -75 -80 -85 82 -90 80 -95 -100 0.1 78 0 5 10 15 20 1 10 1000 10000 100000 Gain vs. Frequency Reference Voltage 620 90 610 70 Gain (dB) 630 110 600 590 50 30 10 580 570 -40 100 F r e q u e n c y (H z ) Input Voltage (V) Reference Voltage (mV) 10 -10 0 40 80 0.01 120 1 10 100 1000 10000 Frequency (kHz) Junction Temperature (ºC) © 2009 SCILLC. All rights reserved. Characteristics subject to change without notice 0.1 3 Doc. No. MD-4007 Rev. P CAT102 APPLICATIONS INFORMATION The CAT102 adjustable shunt regulator features isolated supply inputs and outputs, ideal for isolated power-supply applications using an optocoupler in the feedback path. The CAT102 sinks 20 mA with VOUT at 0.3 V. The wide input supply range allows the device to operate from 2.2 V to 18 V. The CAT102 compares the FB input to a precision 600mV reference. If the FB input is low, the OUT pin sinks no current. If FB rises above 600 mV, the OUT pin sinks up to 20 mA. The current limit can be adjusted by using a resistor R3 connected between the IN and OUT pins. For example, a 3.3 V supply VIN is associated with R3 = 135 Ω, and a 10 V supply works best with R3 = 470 Ω. The CAT102 shunt regulator is limited to low-current applications with the OUT pin capable of sinking up to 20 mA max. Figure 1 shows the CAT102 configured as a shunt regulator. To generate an output voltage of 0.6 V, the FB pin has to be directly connected to the OUT pin. A 1.0 µF capacitor from OUT to GND is recommended when the output voltage is 0.6 V. A resistor-divider connected from OUT to GND is used to produce a higher output voltage as set by the following equation: VOUT = (1 + R1/R2) x 0.6 V Figure 1. Application circuits for 0.6 V output and 1.2 V output voltages R3 VIN VOUT 3.3V 0.6V/20mA 5 OUT IN 3 C2 C1 0.1µF CAT102 2 GND FB 1µF 1 R3 VIN VOUT = (1 + R1/R2) x 0.6V 3.3V 1.2V/20mA 5 OUT IN 3 C1 0.1µF CAT102 2 GND FB 1 R1 C2 10kΩ 1µF R2 10kΩ Doc. No. MD-4007 Rev. P 4 © 2009 SCILLC. All rights reserved. Characteristics subject to change without notice CAT102 TYPICAL APPLICATION VIN VOUT Regulator with Isolation 1V regulated output Opto-isolator VCC > 2.2V R3 100Ω 5 OUT IN 3 C1 0.1µF R4 100kΩ R1 22kΩ C2 CAT102 2 GND FB 1 1µF R2 33kΩ Figure 2. Opto-Feedback Application Circuit In order to allow proper operation of the optocoupler and the CAT102, the supply voltage VCC must be greater than 2.2 V. © 2009 SCILLC. All rights reserved. Characteristics subject to change without notice 5 Doc. No. MD-4007 Rev. P CAT102 PACKAGE OUTLINE DRAWING TSOT-23 5-Lead (TD) (1) SYMBOL D MIN NOM A e E1 E MAX 1.00 A1 0.01 0.05 0.10 A2 0.80 0.87 0.90 b 0.30 c 0.12 0.45 0.15 D 2.90 BSC E 2.80 BSC E1 1.60 BSC e 0.20 0.95 TYP L 0.30 0.40 L1 0.60 REF L2 0.25 BSC θ 0º 0.50 8º TOP VIEW A2 A b θ L A1 c L2 L1 SIDE VIEW END VIEW Notes: (1) All dimensions in millimeters. Angles in degrees. (2) Complies with JEDEC standard MO-193. Doc. No. MD-4007 Rev. P 6 © 2009 SCILLC. All rights reserved. Characteristics subject to change without notice CAT102 EXAMPLE OF ORDERING INFORMATION Prefix Device # Suffix CAT 102 Company ID TD 1 I - Package TD: TSOT-23 Product Number 102 G Lead Finish G: NiPdAu (PPF) T3 Tape & Reel T: Tape & Reel 3: 3,000/Reel Temperature Range I = Industrial (-40°C to 85°C) ORDERING PART NUMBER CAT102TDI-G Notes: (1) All packages are RoHS-compliant (Lead-free, Halogen-free) (2) The device used in the above example is a CAT102TDI-GT3 (TSOT-23, Industrial Temperature, NiPdAu, Tape & Reel, 3,000/Reel) © 2009 SCILLC. All rights reserved. Characteristics subject to change without notice 7 Doc. No. MD-4007 Rev. P CAT102 REVISION HISTORY Date Rev. Description 29-Jan-07 M Added Ordering Information 16-Jun-07 N Changed package from SOT-23 to TSOT-23 Updated Features Updated Functional Diagram Updated Electrical Characteristics Updated Typical Performance Characteristics Changed termination from SnPb to NiPdAu Added MD- to document Number 19-Nov-08 O Change logo and fine print to ON Semiconductor 05-Feb-09 P Updated Electrical Characteristics Table ON Semiconductor and are registered trademarks of Semiconductor Components Industries, LLC (SCILLC). SCILLC reserves the right to make changes without further notice to any products herein. SCILLC makes no warranty, representation or guarantee regarding the suitability of its products for any particular purpose, nor does SCILLC assume any liability arising out of the application or use of any product or circuit, and specifically disclaims any and all liability, including without limitation special, consequential or incidental damages. “Typical” parameters which may be provided in SCILLC data sheets and/or specifications can and do vary in different applications and actual performance may vary over time. All operating parameters, including “Typicals” must be validated for each customer application by customer's technical experts. SCILLC does not convey any license under its patent rights nor the rights of others. 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This literature is subject to all applicable copyright laws and is not for resale in any manner. PUBLICATION ORDERING INFORMATION LITERATURE FULFILLMENT: Literature Distribution Center for ON Semiconductor P.O. Box 5163, Denver, Colorado 80217 USA Phone: 303-675-2175 or 800-344-3860 Toll Free USA/Canada Fax: 303-675-2176 or 800-344-3867 Toll Free USA/Canada Email: [email protected] Doc. No. MD-4007 Rev. P N. American Technical Support: 800-282-9855 Toll Free USA/Canada Europe, Middle East and Africa Technical Support: Phone: 421 33 790 2910 Japan Customer Focus Center: Phone: 81-3-5773-3850 8 ON Semiconductor Website: www.onsemi.com Order Literature: http://www.onsemi.com/orderlit For additional information, please contact your local Sales Representative © 2009 SCILLC. All rights reserved. Characteristics subject to change without notice