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CAT102
Precision, Adjustable Shunt Regulator (600mV Reference)
- +1% Initial Accuracy FEATURES
s Low voltage reference: 600mV s Low temperature coefficient reference: 25ppm s Accurate 600mV reference voltage: s Low supply current: 300A s Open collector output s Directly drives optocouplers s Compact 5-lead SOT23 package s Industrial temperature range: -40C to 85C
- SOT23 Package
+6mV at TJ=25C
s High PSRR: 45dB at 300kHz s High line rejection: +1mV (VCC from 2.2V to 18V)
APPLICATIONS
s SMPS control loop s Low temperature coefficient voltage reference s Power management s Replaces zener diodes s Isolated DC-to-DC converters s Network, telecom and cellular base station
power supplies
s 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 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.
FUNCTIONAL DIAGRAM
IN 5 1 Error Amplifier + VREF 600mV -
+ -
PIN CONFIGURATION
OUT 3
SOT23-5 TOP VIEW FB 1 GND 2 OUT 3 4 NC 5 IN
FB
2 GND
(c) 2003 by Catalyst Semiconductor, Inc. Characteristics subject to change without notice
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Doc. No. 4007, Rev. L
CAT102
PIN DESCRIPTIONS
Pin Number 1 2 3 4 5 Pin Name FB GND OUT NC IN Function Inverting input to error amplifier Ground Output of error amplifier. Source & sink current capability is 20mA. No connection Positive supply
ORDERING INFORMATION
Part Number Package Temperature Range
CAT102EUK-TE7
TE7 = 7" Reel, 3,000 parts per reel.
5-Pin SOT-23
-40 C to 85 C
Doc. No. 4007, Rev. L
2
CAT102
ABSOLUTE MAXIMUM RATINGS
VIN Voltage ........................................................... 20V OUT Voltage ........................................................ 20V FB Voltage ........................................................... 20V VIN, OUT, FB Current ........................................ 50mA Operating Junction Temperature ..................... 150C Lead Soldering Temperature (10 sec) ............. 260C Storage Temperature Range ........... -65C to +150C
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.
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
Conditions
Min 2.2
Typ
Max 18
Units V mA mV
VOUT=1V TJ = 25 C -40 C0.3 600
0.5 606 612
0.5 4
1 8 500
mV mV nA dB dB MHz
IFB PSRR AV BW VOUT
FB Input Current Reference Power Supply Rejection Error Amplifier Open Loop Gain Unity Gain Frequency Output Saturation voltage
45 80 2 100 2.5 200 400 250
mV mA/mV nA mA
TRANSC Output Transconductance ILEAK IOUT(MAX)
1.
Output Leakage Current Maximum Output Current
Thermal Characteristics (JA) 5-lead, SOT-23: 255C/W
3
Doc. No. 4007, Rev. L
CAT102
TYPICAL PERFORMANCE CHARACTERISTICS
Line Regulation (at 1mA)
0.4
6
Load Regulation
Output Voltage Change (mV)
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
Power-Supply Rejection Ratio vs. Frequency
-50 -55 -60 -65 -70 -75 -80 -85 -90 -95 -100
Supply Current (A)
260
220 200 180 160 140 120 100 0 5 10 15 20
PSRR (dB)
240
0.1
1
10
100
1000
10000 100000
Load Current (mA)
Frequency (Hz)
Doc. No. 4007, Rev. L
4
CAT102
TYPICAL PERFORMANCE CHARACTERISTICS
FB Bias Current vs. Temperature (VCC=2.5V)
0
630
Reference Voltage
Reference Voltage (V)
620 610 600 590 580 570 -40 0 40 80 120
10mA
FB Bias Current (nA)
-10 -20 -30 -40 -50 -60 -70 -40
0
40
80
120
Junction Temperature (C)
Junction Temperature (C)
Gain vs. Frequency
110 90 70 50 30 10 -10
Gain (dB)
0.01
0.1
1
10
100 1000 10000
Frequency (kHz)
5
Doc. No. 4007, Rev. L
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 V OUT 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 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 0.6V 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.
R3 VIN 3.3V 5 IN CAT102 2 GND FB 1 OUT 3 VOUT 0.6V/20mA
R3 VIN 3.3V 5 IN CAT102 2 GND FB 1 R2 10k OUT 3 R1 10k
VOUT = (1+R1/R2) x 0.6V 1.2V/20mA
Figure 1. Application circuits for 0.6V output and 1.2V output voltages
Doc. No. 4007, Rev. L
6
CAT102
TYPICAL APPLICATIONS
VOUT Regulator with Isolation 1V regulated output
VIN
Opto-isolator VCC > 2.2V
R3 100
R4 100k
5
IN
OUT
3
CAT102
2 GND FB 1
R1 22k
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.
7
Doc. No. 4007, Rev. L
CAT102
PACKAGE OUTLINES 5 LEAD SOT-23
1.900 0.950 PIN #5 PIN #4
PIN #1 PIN #3
0.350+0.150 -0.000
0.418+0.250
2.900+0.100
R 0. 0 02 0. 7+ 19
1.100+0.200
1.650+0.050 -0.150 BOTTOM PACKAGE
2.800+0.200
1.600 +0.050 -0.150 TOP PACKAGE
1.200+0.250
070
- 0 .1
30
0.200
0.100+0.050
0.575
R 0.
DATUM "A"
NOTES: 1. ALL DIMENSIONS ARE IN MM. 2. PACKAGE OUTLINE DIMENSIONS INCLUSIVE OF METAL BURR. 3. PACKAGE OUTLINE EXCLUSIVE OF MOLD FLASH. MOLD FLASH SHALL NOT EXCEED 0.076MM. 4. ALL PACKAGE SURFACE TO BE MIRROR FINISH. 5. MOLDING WITH DIE FACING UP, AND FORMING WITH DIE FACING DOWN. 6. FOOT LENGTH TO BE MEASURED AT THE INTERCEPT POINT OF EXTERNAL LEADS AND DATUM "A". 7. LEADFINISH PLATING: 0.00762MM - 0.0254MM. PACKAGE OUTLINE EXCLUSIVE OF LEADFINISH PLATING.
R0 .0 .0 -0 .1 30 (4 X)
0.152+0.008
0.400+0.150 -0.050
Doc. No. 4007, Rev. L
8
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Catalyst Semiconductor, Inc. Corporate Headquarters 1250 Borregas Avenue Sunnyvale, CA 94089 Phone: 408.542.1000 Fax: 408.542.1200 www.catalyst-semiconductor.com
Publication #: Revison: Issue date: Type:
4007 L 8/20/03 Final

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