CAT102 [CATALYST]
Precision, Adjustable Shunt Regulator (600mV Reference); 精密，可调并联稳压器（ 600mV的参考）
| 型号： | CAT102 |
| 厂家： | 
CATALYST SEMICONDUCTOR |
| 描述： | Precision, Adjustable Shunt Regulator (600mV Reference) |
| 文件： | 总9页 (文件大小：83K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
CAT102
Precision, Adjustable Shunt Regulator (600mV Reference)
- +1% Initial Accuracy
- SOT23 Package
FEATURES
■ Low voltage reference: 600mV
■ Low supply current: 300µA
■ Low temperature coefficient reference: 25ppm
■ Open collector output
■ Accurate 600mV reference voltage:
+6mV at TJ=25°C
■ Directly drives optocouplers
■ Compact 5-lead SOT23 package
■ Industrial temperature range: -40°C to 85°C
■ High PSRR: 45dB at 300kHz
■ High line rejection: +1mV (VCC from 2.2V to 18V)
APPLICATIONS
■ SMPS control loop
■ Isolated DC-to-DC converters
■ Low temperature coefficient voltage reference
■ Power management
■ Network, telecom and cellular base station
power supplies
■ Adjustable voltage reference
■ Replaces zener diodes
DESCRIPTION
Power supply rejection is a high 45dB at 300kHz. The
output, OUT, can sink 20mA at a maximum saturation
voltage of 250mV.
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°Cthereferencevoltageiswithin8mVofthenominal
600mV. In addition, the error amplifier output and the
supply voltage pin are on separate pins.
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
PIN CONFIGURATION
IN
OUT
3
5
SOT23-5
Error
Amplifier
TOP VIEW
1
FB
+
–
1
2
3
5
4
FB
GND
OUT
IN
V
REF
+
–
NC
600mV
2
GND
© 2003 by Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
Doc. No. 4007, Rev. L
1
CAT102
PIN DESCRIPTIONS
Pin Number
Pin Name
FB
Function
1
2
Inverting input to error amplifier
Ground
GND
Output of error amplifier. Source & sink current capability is
20mA.
3
OUT
4
5
NC
IN
No connection
Positive supply
ORDERING INFORMATION
Part Number
Package
Temperature Range
CAT102EUK-TE7
5-Pin SOT-23
-40˚ C to 85˚ C
TE7 = 7" Reel, 3,000 parts per reel.
Doc. No. 4007, Rev. L
2
CAT102
ABSOLUTE MAXIMUM RATINGS
These are stress ratings only and functional operation is not
VIN Voltage ........................................................... 20V
OUT Voltage ........................................................ 20V
FB Voltage ........................................................... 20V
VIN, OUT, FB Current........................................ 50mA
Operating Junction Temperature ..................... 150°C
Lead Soldering Temperature (10 sec)............. 260°C
Storage Temperature Range ...........-65°C to +150°C
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 -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 Parameter
Conditions
Min
Typ
Max
18
Units
V
VIN
IIN
Supply Voltage Range
2.2
Quiescent Supply Current
VOUT=1V
0.3
0.5
606
612
1
mA
TJ = 25˚ C
594
588
600
FB Threshold
Reference Voltage
VFB
mV
-40˚ C<TJ<105˚ C
VIN = 2.2V to VIN=18V
IOUT = 1mA to 10mA
Line Regulation
Load Regulation
FB Input Current
0.5
4
mV
mV
8
IFB
-500
35
60
1
500
nA
PSRR Reference Power Supply Rejection Frequency = 300kHz
45
80
dB
AV
Error Amplifier Open Loop Gain
Unity Gain Frequency
IOUT = 2mA, VOUT = 1V
IOUT = 2mA, VOUT = 1V
IOUT = 20mA, VFB = HIGH
IOUT = 1mA to 20mA
VOUT = 16V, VFB = 0
VOUT = 0.3V
dB
BW
VOUT
2
MHz
mV
Output Saturation voltage
100
2.5
200
250
400
TRANSC Output Transconductance
ILEAK Output Leakage Current
IOUT(MAX) Maximum Output Current
mA/mV
nA
20
mA
1. Thermal Characteristics (Θ
5-lead, SOT-23: 255°C/W
)
JA
Doc. No. 4007, Rev. L
3
CAT102
TYPICAL PERFORMANCE CHARACTERISTICS
Line Regulation (at 1mA)
Load Regulation
0.4
0.35
0.3
6
5
4
3
2
1
0
0.25
0.2
0.15
0.1
0.05
0
2.2
6
10
14
18
1
5
10
15
20
Supply Voltage (V)
Load Current (mA)
Power-Supply Rejection Ratio vs. Frequency
Supply Current vs. Load Current
300
280
260
240
220
200
180
160
140
120
100
-50
-55
-60
-65
-70
-75
-80
-85
-90
-95
-100
0.1
1
10
100
1000 10000 100000
0
5
10
15
20
Load Current (mA)
Frequency (Hz)
Doc. No. 4007, Rev. L
4
CAT102
TYPICAL PERFORMANCE CHARACTERISTICS
FB Bias Current vs. Temperature (VCC=2.5V)
Reference Voltage
630
620
610
600
590
580
570
0
-10
-20
-30
-40
-50
-60
-70
10mA
-40
0
40
80
120
-40
0
40
80
120
Junction Temperature (°C)
Junction Temperature (°C)
Gain vs. Frequency
110
90
70
50
30
10
-10
0.01 0.1
1
10 100 1000 1000
0
Frequency (kHz)
Doc. No. 4007, Rev. L
5
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.
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 =
135Ω, and a 10V supply works best with R3 = 470Ω.
The CAT102 shunt regulator is limited to low-current
applications with the OUT pin capable of sinking up to
20mA max.
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
1.0µF 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
R3
V
V
IN
3.3V
OUT
0.6V/20mA
3
1
5
IN
OUT
FB
CAT102
2
GND
R3
V
= (1+R1/R2) x 0.6V
1.2V/20mA
OUT
V
IN
3.3V
3
1
5
IN
OUT
FB
R1
10k
CAT102
2
GND
R2
10k
Figure 1. Application circuits for 0.6V output and 1.2V output voltages
Doc. No. 4007, Rev. L
6
CAT102
TYPICAL APPLICATIONS
1V regulated
output
VOUT
VIN
Regulator
with
Isolation
Opto-isolator
VCC > 2.2V
R3
R4
100Ω
100kΩ
3
1
5
IN
OUT
FB
R1
22kΩ
CAT102
2
GND
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
2.2V.
Doc. No. 4007, Rev. L
7
CAT102
PACKAGE OUTLINES
5 LEAD SOT-23
1.900
0.950
PIN #4
PIN #5
PIN #1
+0.150
0.350
-0.000
PIN #3
+0.050
1.600
-0.150
TOP PACKAGE
2.900+0.100
DATUM "A"
0.575
+0.150
0.400
-0.050
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.
Doc. No. 4007, Rev. L
8
Copyrights, Trademarks and Patents
Trademarks and registered trademarks of Catalyst Semiconductor include each of the following:
DPP ™
AE2 ™
Catalyst Semiconductor has been issued U.S. and foreign patents and has patent applications pending that protect its products. For a complete list of patents
issued to Catalyst Semiconductor contact the Company’s corporate office at 408.542.1000.
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
1250 Borregas Avenue
Sunnyvale, CA 94089
Phone: 408.542.1000
Publication #: 4007
Revison:
Issue date:
Type:
L
8/20/03
Final
Fax: 408.542.1200
www.catalyst-semiconductor.com
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