CAT102

CAT102 Precision, Adjustable Shunt Regulator (600 mV Reference) FEATURES 600 mV low voltage reference ±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 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 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. 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 7. FUNCTIONAL DIAGRAM IN Error Amplifier + PIN CONFIGURATION OUT 3 TSOT-23 5L Top View FB GND OUT 11 22 43 4 5 NC 5 8 IN 5 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 20 mA. No connection Positive supply FB GND OUT NC IN © 2009 SCILLC. All rights reserved. Characteristics subject to change without notice 1 Doc. No. MD-4007 Rev. P CAT102 ABSOLUTE MAXIMUM RATINGS Parameters VIN Voltage OUT Voltage FB Voltage VIN, OUT, FB Current Operating Junction Temperature (10 seconds) Lead Soldering Temperature (10 seconds) Storage Temperature Range (1) 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 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 VIN IIN VFB Parameter Supply Voltage Range Quiescent Supply Current FB Threshold Reference Voltage Line Regulation Load Regulation IFB PSRR (3) AV BW (3) Conditions VOUT =1 V TJ = 25ºC -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 Frequency = 300 kHz IOUT = 2 mA, VOUT = 1 V IOUT = 2 mA, VOUT = 1 V IOUT = 20 mA, VFB = HIGH IOUT = 1 mA to 20 mA VOUT = 16 V, VFB = 0 VOUT = 0.3 V Min 2.2 Typ 90 Max 18 500 606 608 Units V µA mV mV mV nA dB dB MHz 594 592 600 0.5 3 -500 35 60 1 65 80 2 130 2.5 0.5 20 1 8 500 FB Input Current Reference Power Supply Rejection Error Amplifier Open Loop Gain Unity Gain Frequency Output Saturation voltage VOUT TRANSC ILEAK IOUT(MAX) (3) 250 2 mV mA/mV µA mA Output Transconductance Output Leakage Current Maximum Output Current 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) 0.4 Output Voltage Change (mV) Output Voltage Change (mV) 6 5 4 3 2 1 0 Load Regulation 0.35 0.3 0.25 0.2 0.15 0.1 0.05 0 2 6 10 14 18 Supply Voltage (V) 1 5 10 15 20 Load Current (mA) Supply current vs. Input Voltage 92 90 Power-Supply Rejection Ratio vs. Frequency -50 -55 -60 PSRR (dB) Supply Current (µA) 88 86 84 82 80 78 0 5 10 Input Voltage (V) 15 20 -65 -70 -75 -80 -85 -90 -95 -100 0.1 1 10 100 1000 10000 100000 F r e q u e n c y (H z ) Reference Voltage 630 620 Gain vs. Frequency 110 90 Reference Voltage (mV) Gain (dB) 610 600 590 580 570 -40 70 50 30 10 -10 0 40 80 120 0.01 0.1 1 10 100 1000 10000 Junction Temperature (ºC) Frequency (kHz) © 2009 SCILLC. All rights reserved. Characteristics subject to change without notice 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. 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 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. Application circuits for 0.6 V output and 1.2 V output voltages VIN 3.3V R3 VOUT 0.6V/20mA 5 C1 0.1µF IN OUT 3 C2 CAT102 2 GND FB 1 1µF VIN 3.3V R3 VOUT = (1 + R1/R2) x 0.6V 1.2V/20mA 5 C1 0.1µF IN OUT 3 R1 C2 1µF CAT102 2 GND FB 1 10kΩ R2 10kΩ Doc. No. MD-4007 Rev. P 4 © 2009 SCILLC. All rights reserved. Characteristics subject to change without notice CAT102 TYPICAL APPLICATION 1V regulated output VIN VOUT Regulator with Isolation VCC > 2.2V Opto-isolator R3 100Ω R4 100kΩ 5 IN OUT 3 C1 0.1µF C2 CAT102 2 R1 22kΩ 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) D e SYMBOL A A1 A2 b c D E1 E MIN 0.01 0.80 0.30 0.12 NOM 0.05 0.87 0.15 2.90 BSC 2.80 BSC 1.60 BSC 0.95 TYP MAX 1.00 0.10 0.90 0.45 0.20 E E1 e L L1 L2 θ 0º 0.30 0.40 0.60 REF 0.25 BSC 0.50 8º TOP VIEW A2 A θ b A1 L1 L c L2 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 CAT Company ID 1 Device # Suffix 102 TD Package TD: TSOT-23 I - G T3 Tape & Reel T: Tape & Reel 3: 3,000/Reel Lead Finish G: NiPdAu (PPF) Product Number 102 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 29-Jan-07 Rev. M Description Added Ordering Information 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 Change logo and fine print to ON Semiconductor Updated Electrical Characteristics Table 16-Jun-07 N 19-Nov-08 05-Feb-09 O P 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: orderlit@onsemi.com 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 ON Semiconductor Website: www.onsemi.com Order Literature: http://www.onsemi.com/orderlit For additional information, please contact your local Sales Representative Doc. No. MD-4007 Rev. P 8 © 2009 SCILLC. All rights reserved. Characteristics subject to change without notice