View CAT102TDI-G_4158290.PDF datasheet online --- IC-ON-LINE

Datasheet File OCR Text:

CAT102
Precision, Adjustable Shunt Regulator (600mV Reference)
FEATURES
600mv low voltage reference 35ppm low temperature coefficient 6mV initial accuracy High PSRR: 45dB at 300kHz Better line regulation: 1mV (VIN from 2.2V to 18V) Low supply current: 90A Open drain output Directly drives optocouplers Industrial temperature range of -40C to 85C 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 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 (IN) 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 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 20mA. No connection Positive supply
FB GND OUT NC IN
(c) Catalyst Semiconductor, Inc. Characteristics subject to change without notice
1
Doc. No. MD-4007 Rev. N
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 < TJ < 105C VIN = 2.2V to VIN =18V IOUT = 1mA to 10mA -40C < TJ < 105C -500 35 60 1 65 80 2 130 2.5 20 400 250 594 592 0.5 3 35 Conditions Min 2.2 90 600 Typ Max 18 500 606 608 1 8 50 500 Units V A mV mV mV ppm/C nA dB dB MHz mV mA/mV nA 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 (JA) of TSOT-23 5-lead: 255C/W
Doc. No. MD-4007 Rev. N
2
(c) Catalyst Semiconductor, Inc. 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 (A)
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 (C)
Frequency (kHz)
(c) Catalyst Semiconductor, Inc. Characteristics subject to change without notice
3
Doc. No. MD-4007 Rev. N
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
Doc. No. MD-4007 Rev. N
4
(c) Catalyst Semiconductor, Inc. Characteristics subject to change without notice
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.
(c) Catalyst Semiconductor, Inc. Characteristics subject to change without notice
5
Doc. No. MD-4007 Rev. N
CAT102 PACKAGE OUTLINES
TSOT-23 5-Lead (TD)
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 0 0.30
0.40 0.60 REF 0.25 BSC
0.50
8
TOP VIEW
A2 A
b
A1 L1
L
c
L2
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 JEDEC MO-193.
Doc. No. MD-4007 Rev. N
6
(c) Catalyst Semiconductor, Inc. Characteristics subject to change without notice
CAT102 EXAMPLE OF ORDERING INFORMATION
Prefix CAT
Company ID
Device # Suffix 102 TD
Package TD: TSOT-23
I
-
G
T3
Tape & Reel T: Tape & Reel 3: 3000/Reel
Lead Finish G: NiPdAu (PPF)
Product Number 102
Temperature Range I = Industrial (-40C to 85C)
Notes: (1) (2) All packages are RoHS-compliant (Lead-free, Halogen-free) The device used in the above example is a CAT102TDI-GT3 (TSOT-23, Industrial Temperature, NiPdAu, Tape & Reel)
ORDERING PART NUMBER
CAT102TDI-G
(c) Catalyst Semiconductor, Inc. Characteristics subject to change without notice
7
Doc. No. MD-4007 Rev. N
REVISION HISTORY
Date 01/29/2007 Rev. M Reason 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
06/16/2007
N
Copyrights, Trademarks and Patents (c) Catalyst Semiconductor, Inc. Trademarks and registered trademarks of Catalyst Semiconductor include each of the following: Beyond MemoryTM, DPPTM, EZDimTM, LDDTM, 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 www.catsemi.com
Document No: MD-4007 Revision: N Issue date: 07/16/07

▲Up To Search▲

Price & Availability of CAT102TDI-G

	To Download CAT102TDI-G Datasheet File
If you can't view the Datasheet, Please click here to try to view without PDF Reader .