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TS4431
1.224V Open Collector Shunt Voltage Reference

Internal 1.224V 0.5% precision Low output saturation voltage 75 mV max between SINK and GND Low current consumption: 250A Industrial temperature range: -40 to +85C 100ppm/C temperature coefficient Pin connections (top view) SOT23-5L (Plastic Micropackage)
Description
The TS4431 is a four-terminal device dedicated to low voltage Switch Mode Power Supplies (SMPS). It integrates a 1.224V voltage reference, an amplifier, and an open collector output transistor in a single package. The TS4431's operating mode is similar to the well-known standard voltage reference, the TL431. It maintains the desired feedback voltage at the REF pin in a closed loop configuration by sinking a current proportional to the error voltage at the REF pin. TS4431 features an open collector transistor with an ultra-low saturation voltage, allowing it to be used in series with the optocoupler in an SMPS architecture to regulate low voltage SMPS.
1 Vc c 2 Gnd 3 Nc
Sink
5
Ref
4
Applications

Low voltage switch mode power supplies Isolated DC/DC converter Computers Low voltage discrete regulator
Order Codes
Part Number TS4431AILT TS4431ILT Accuracy 0.5% -40, +85C 1% SOT23-5 Tape & Reel L275 Temperature Range Package Packing Marking L288
November 2005
Rev 2 1/8
www.st.com
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Absolute Maximum Ratings
TS4431
1
Absolute Maximum Ratings
Table 1.
Symbol ISINK VCC VSINK PD TSTD ESD Machine Model (MM) TLEAD Lead Temperature (soldering, 10 seconds) 200 250 V C Output sink current Supply voltage Output voltage Power Dissipation (1)SOT23-5 Storage Temperature Human Body Model (HBM)
Key parameters and their absolute maximum ratings
Parameter Value 30 12 12 500 -65 to +150 2 Unit mA V V mW C kV
1. PD has been calculated with TAMB = 25C, TJunction=150C and RthJA = 250C/W for the SOT23-5 package RthJC = 81C/W for the SOT23-5 package
Table 2.
Symbol TOPER VCC ISINK
Operating conditions
Parameter Operating temperature range Supply voltage Output sink current Value -40 to +85 1.5 to 10 20 Unit C V mA
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Typical Application Schematic
TS4431
2
Typical Application Schematic
Figure 1. SMPS power supply: secondary side
D1 D2
L1 C1
Vout
R1
1 Cd1 100nF 2
Vcc
U1 TS4431
Sink
5
R2
Gnd
Vref R3
3
Nc
Ref
4
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Electrical Characteristics
TS4431
3
Electrical Characteristics
Table 3.
Symbol VREF
Electrical characteristics for Tamb = 25C, VCC = 1.8V, ISINK = 2mA unless otherwise specified
Parameter Reference voltage TS4431A 0.5% -40C < T < +85C Reference voltage TS4431 1% -40C < T < +85C Temperature coefficient Change in VREF due to change in VCC Change in VREF due to change in ISINK Supply current VCC =1.5 to 10V -40C < T < +85C ISINK=0.5 to 20mA -40C < T < +85C ISINK=2mA -40C < T < +85C 250 1 2 7 1.203 1.245 100 2 mV 3 10 mV 15 300 350 15 20 A -40C < T < +85C Reference input current 0.1< ISINK < 10mA -40C < T < +85C ISINK=5mA 30 0.4 30 1 A 2 50 60 mV ISINK=20mA -40C < T < +85C 90 100 120 0.05 A 0.1 A ppm/C 1.209 1.212 1.224 1.239 1.236 V Test Condition Min. 1.218 Typ. 1.224 Max. 1.230 V Unit
VREF TC VREF ---------------VCC V REF ---------------ISIN K ICC
IOFF
Ref < 0.6V OFF-State supply current
IREF
VSAT
Output transistor saturation voltage
-40C < T < +85C
IOH
Output leakage current
VSINK=VCC -40C < T < +85C
Note:
Limits are 100% production tested at 25C. Limits over temperature are guaranteed through correlation and by design.
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Electrical Characteristics
Figure 2.
1.225 1.224 1.223 Vref (V) 1.222 1.221 1.22 1.219 1.218 -40C -20C 0C 25C 50C 85C Te m perature (C) Vcc=1.8V
Vref (V)
TS4431
Figure 3.
1.228 1.226 1.224 1.222 1.22 1.218 1.216 -40C -20C 0C 25C 50C 85C Tem perature (C) Vcc=10V Vcc=1.5V
Vref vs. temp. Isink=2mA
Vref vs. temp. Isink=2mA
Figure 4.
1.6 1.4 1.2 1 0.8 0.6 0.4 0.2 0
dVref/dVcc vs. temp. Isink=2mA
Figure 5.
350 300 250 Icc (A) 200 150 100 50 0
Icc vs. temp. Isink=2mA
dVref/dVcc (mV)
-40C
-20C
0C
25C
50C
85C
-40C -20C
0C
25C
50C
85C
Tem perature (C) Vcc=1.5V to 10V
Tem perature (C) Vcc=1.8V
Figure 6.
400 350 300 250 200 150 100 50 0
Icc vs. temp. Isink=2mA
Figure 7.
1.235 1.23 Vref (V) 1.225 1.22 1.215
Vref vs. temp. Vcc=1.8V
Icc (A)
-40C -20C
0C
25C
50C
85C
-40C -20C
0C
25C
50C
85C
Tem perature (C) Vcc=1.5V Vcc=10V
Tem perature (C) Isink=20mA Isink=0.5mA
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Electrical Characteristics
Figure 8.
8 7 6 5 4 3 2 1 0 -40C -20C 0C 25C 50C 85C Tem perature (C) Isink 0.5 to 20mA
TS4431
Figure 9.
0.8 0.7 0.6 0.5 0.4 0.3 0.2 0.1 0 -40C -20C 0C 25C 50C 85C Tem perature (C) Isink 0.1 to 10mA
dVref/dIsink vs. temp. Vcc=1.8V
Iref vs. temp. Vcc=1.8V
dVref/DIsink (mV)
Figure 10. Vsat vs. temp. Vcc=1.8V
100 80 Vsat (mV) 60 40 20 0 -40C -20C 0C 25C 50C 85C Tem perature (C) Isink=20mA Isink=5mA
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Iref (A)
TS4431
Package Mechanical Data
4
Package Mechanical Data
In order to meet environmental requirements, ST offers these devices in ECOPACK(R) packages. These packages have a Lead-free second level interconnect. The category of second level interconnect is marked on the package and on the inner box label, in compliance with JEDEC Standard JESD97. The maximum ratings related to soldering conditions are also marked on the inner box label. ECOPACK is an ST trademark. ECOPACK specifications are available at: www.st.com.
SOT23-5L Package
SOT23-5L MECHANICAL DATA
mm. DIM. MIN. A A1 A2 b C D E E1 e e1 L 0.35 0.90 0.00 0.90 0.35 0.09 2.80 2.60 1.50 0 .95 1.9 0.55 13.7 TYP MAX. 1.45 0.15 1.30 0.50 0.20 3.00 3.00 1.75 MIN. 35.4 0.0 35.4 13.7 3.5 110.2 102.3 59.0 37.4 74.8 21.6 TYP. MAX. 57.1 5.9 51.2 19.7 7.8 118.1 118.1 68.8 mils
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Revision History
TS4431
5
Revision History
Date March 2005 Nov. 2005 Revision 1 2 Changes First release corresponding to Preliminary Data version of datasheet. First release of fully mature product data sheet.
Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of STMicroelectronics. Specifications mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information previously supplied. STMicroelectronics products are not authorized for use as critical components in life support devices or systems without express written approval of STMicroelectronics. The ST logo is a registered trademark of STMicroelectronics. All other names are the property of their respective owners (c) 2005 STMicroelectronics - All rights reserved STMicroelectronics group of companies Australia - Belgium - Brazil - Canada - China - Czech Republic - Finland - France - Germany - Hong Kong - India - Israel - Italy - Japan Malaysia - Malta - Morocco - Singapore - Spain - Sweden - Switzerland - United Kingdom - United States of America www.st.com
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