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| CAT102 Precision, Adjustable Shunt Regulator (600mV Reference) FEATURES Low voltage reference: 600mV Low temperature coefficient reference: 25ppm Accurate 600mV reference voltage: +6mV at TJ = 25C High PSRR: 45dB at 300kHz High line rejection: 1mV (VCC from 2.2V to 18V) Low supply current: 300A Open collector output Directly drives optocouplers Compact 5-lead SOT23 package Industrial temperature range: -40C to 85C 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 -40C to 105C 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 (c) 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 C C C ELECTRICAL CHARACTERISTICS Electrical characteristics are guaranteed over the full operating temperature range of -40C to +85C with a junction temperature from -40C to +105C 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 -40C Doc. No. 4007 Rev. M 2 (c) 2007 Catalyst Semiconductor, Inc. Characteristics subject to change without notice CAT102 TYPICAL PERFORMANCE CHARACTERISTICS Line Regulation (at 1mA) 0.4 Output Voltage Change (mV) Load Regulation 6 Output Voltage Change (mV) 0.35 0.3 0.25 0.2 0.15 0.1 0.05 0 2.2 6 10 14 18 5 4 3 2 1 0 1 5 10 15 20 Supply Voltage (V) Load Current (mA) Supply Current vs. Load Current 300 280 260 Supply Current (A) Power-Supply Rejection Ratio vs. Frequency -50 -55 -60 PSRR (dB) 240 220 200 180 160 140 120 100 0 5 10 15 L o a d C u r re n t (m A ) 20 -65 -70 -75 -80 -85 -90 -95 -100 0.1 1 10 100 1000 10000 100000 F re q u e n c y (H z ) (c) 2007 Catalyst Semiconductor, Inc. Characteristics subject to change without notice 3 Doc. No. 4007 Rev. M CAT102 TYPICAL PERFORMANCE CHARACTERISTICS FB Bias Current vs. Temperature (V CC = 2.5V) 0 Reference Voltage (V) FB Bias Current (nA) 630 620 610 600 590 580 Reference Voltage 10mA -10 -20 -30 -40 -50 -60 -70 -40 0 40 80 120 570 -40 0 40 80 120 Junction Temperature (C) Junction Temperature (C) Gain vs. Frequency 110 90 Gain (dB) 70 50 30 10 -10 0.01 0.1 1 10 100 1000 10000 Frequency (kHz) Doc. No. 4007 Rev. M 4 (c) 2007 Catalyst Semiconductor, Inc. Characteristics subject to change without notice 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 20mA with VOUT at 0.3V. The wide input supply range allows the device to operate from 2.2V to 18V. 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 600mV, the OUT pin sinks up to 20mA. Figure 1 shows the CAT102 configured as a shunt regulator. To generate an output voltage of 0.6V, the FB pin has to be directly connected to the OUT pin. A 1.0F capacitor from OUT to GND is recommended when the output voltage is 0.6V. A resistordivider connected from OUT to GND is used to produce a higher output voltage as set by the following equation: VOUT = (1 + R1/R2) x 0.6V The current limit can be adjusted by using a resistor R3 connected between the IN and OUT pins. For example, a 3.3V supply VIN is associated with R3 = 135, and a 10V supply works best with R3 = 470. The CAT102 shunt regulator is limited to low-current applications with the OUT pin capable of sinking up to 20mA max. Figure 1. Application circuits for 0.6V output and 1.2V output voltages VIN 3.3V R3 VOUT 0.6V/20mA 5 C1 0.1F IN OUT 3 C2 CAT102 2 GND FB 1 1F VIN 3.3V R3 VOUT = (1 + R1/R2) x 0.6V 1.2V/20mA 5 C1 0.1F IN OUT 3 R1 C2 1F CAT102 2 GND FB 1 10k R2 10k (c) 2007 Catalyst Semiconductor, Inc. Characteristics subject to change without notice 5 Doc. No. 4007 Rev. M CAT102 TYPICAL APPLICATION 1V regulated output VIN VOUT Regulator with Isolation VCC > 2.2V Opto-isolator R3 100 R4 100k 5 IN OUT 3 C1 0.1F C2 CAT102 2 R1 22k GND FB 1 1F R2 33k 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 2.2V. Doc. No. 4007 Rev. M 6 (c) 2007 Catalyst Semiconductor, Inc. Characteristics subject to change without notice CAT102 PACKAGE OUTLINES SOT-23 5 LEAD SYMBOL A A1 A2 b C D E E1 e L L1 L2 TOP VIEW MIN 1.00 0.05 1.00 0.35 NOM 1.15 1.10 0.127 MAX 1.30 0.15 1.20 0.50 2.80 2.60 1.50 0.35 2.90 2.80 1.60 0.95 TYP 0.45 0.60 REF 0.20 BSC 3.00 3.00 1.70 0.55 1 2 0 10 10 8 SIDE VIEW END VIEW For current Tape and Reel information, download the PDF file from: http://www.catsemi.com/documents/tapeandreel.pdf. Notes: (1) All dimensions in millimeters. Angles in degrees. (2) Complies with ANSI Y14.5M. (c) 2007 Catalyst Semiconductor, Inc. Characteristics subject to change without notice 7 Doc. No. 4007 Rev. M CAT102 EXAMPLE OF ORDERING INFORMATION Prefix CAT Company ID Device # Suffix 102 TB Package TB: SOT-23 Temperature Range I = Industrial (-40C to 85C) I - T3 Tape & Reel T: Tape & Reel 3: 3000/Reel 10: 10000/Reel Product Number 102 Notes: (1) (2) All packages are RoHS-compliant (Lead-free, Halogen-free) The device used in the above example is a CAT102TBI-T3 (SOT-23, Industrial Temperature, Matte-Tin, Tape & Reel) ORDERING PART NUMBER CAT102TBI Doc. No. 4007 Rev. M 8 (c) 2007 Catalyst Semiconductor, Inc. Characteristics subject to change without notice REVISION HISTORY Date 01/29/2007 Rev. M Reason Added Ordering Information Copyrights, Trademarks and Patents Trademarks and registered trademarks of Catalyst Semiconductor include ech of the following: Beyond MemoryTM, DPPTM, EZDimTM, MiniPotTM, and Quad-ModeTM Catalyst Semiconductor has been issued U.S. and foreign patents and has patent applications pending that protect its products. CATALYST SEMICONDUCTOR MAKES NO WARRANTY, REPRESENTATION OR GUARANTEE, EXPRESS OR IMPLIED, REGARDING THE SUITABILITY OF ITS PRODUCTS FOR ANY PARTICULAR PURPOSE, NOR THAT THE USE OF ITS PRODUCTS WILL NOT INFRINGE ITS INTELLECTUAL PROPERTY RIGHTS OR THE RIGHTS OF THIRD PARTIES WITH RESPECT TO ANY PARTICULAR USE OR APPLICATION AND SPECIFICALLY DISCLAIMS ANY AND ALL LIABILITY ARISING OUT OF ANY SUCH USE OR APPLICATION, INCLUDING BUT NOT LIMITED TO, CONSEQUENTIAL OR INCIDENTAL DAMAGES. Catalyst Semiconductor products are not designed, intended, or authorized for use as components in systems intended for surgical implant into the body, or other applications intended to support or sustain life, or for any other application in which the failure of the Catalyst Semiconductor product could create a situation where personal injury or death may occur. Catalyst Semiconductor reserves the right to make changes to or discontinue any product or service described herein without notice. Products with data sheets labeled "Advance Information" or "Preliminary" and other products described herein may not be in production or offered for sale. Catalyst Semiconductor advises customers to obtain the current version of the relevant product information before placing orders. Circuit diagrams illustrate typical semiconductor applications and may not be complete. Catalyst Semiconductor, Inc. Corporate Headquarters 2975 Stender Way Santa Clara, CA 95054 Phone: 408.542.1000 Fax: 408.542.1200 1Hwww.catsemi.com Document No: 4007 Revision: M Issue date: 01/29/07 |
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