March 2006 Revision 1 1/8
8
TS4436
Adjustable 0.6V Open Collector Shunt Voltage Reference
■Internal 0.6V ±0.5% precision
■Low output saturation voltage
75mV max. between SINK and GND
■Low current consumption: 150µA
■Low supply voltage 1.7V
■Industrial temperature range: -40 to +85°C
■150ppm/°C temperature coefficient
■Lead free available
Description
The TS4436 is a four-terminal device dedicated to
low voltage Switch Mode Power Supplies
(SMPS).
It integrates a 0.6V voltage reference, an
amplifier, and an open collector output transistor
in a single package. The TS4436’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.
TS4436 features an open collector transistor with
an ultra-low saturation voltage. This feature allows
it to be used in series with the optocoupler in an
SMPS for regulation up to a 1.8V output voltage.
Applications
■Low voltage switch mode power supplies
■Isolated DC/DC converter
■Computers
■Low voltage discrete regulators
Order Codes
SC70
(Plastic Micropackage)
Pin connections (top view)
1
2
34
5
PGND
GND
REF
VSINK CC
1
2
34
5
PGND
GND
REF
VSINK CC
Part Number Accuracy Temperature Range Package Packing Marking
TS4436AICT 0.5% -40, +85°C SC70 Tape & Reel L22
TS4436ICT 1% L21
www.st.com
Absolute Maximum Ratings and Operating Conditions TS4436
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1 Absolute Maximum Ratings and Operating
Conditions
Table 1. Key parameters and their absolute maximum ratings
Symbol Parameter Value Unit
ISINK Output sink current 30 mA
VCC Supply voltage 12 V
VSINK Output voltage 12 V
Pdiss Power Dissipation (1)SOT23-5
1. Pdiss has been calculated with TAMB = 25°C, TJunction=150°C and
RthJA = 250°C/W for the SOT23-5 package
RthJC = 81°C/W for the SOT23-5 package
mW
Pdiss Power Dissipation (2)SC70
2. Pdiss has been calculated with TAMB = 25°C, TJunction=150°C and
RthJA = 250°C/W for the SOT23-5 package
RthJC = 81°C/W for the SOT23-5 package
310 mW
TSTD Storage Temperature -65 to +150 °C
ESD Human Body Model (HBM) 2 kV
Machine Model (MM) 200 V
TLEAD Lead Temperature (soldering, 10 seconds) 250 °C
Table 2. Operating conditions
Symbol Parameter Value Unit
TOPER Operating temperature range -40 to +85 °C
VCC Supply voltage 1.7 to 10 V
ISINK Output sink current up to 20 mA
Typical Application Schematic TS4436
3/8
2 Typical Application Schematic
Figure 1. SMPS power supply: secondary side
D1
D2 C1
L1
R1
R2
R3
Vout
Cd1
100nF
Pgnd
Gnd
Ref
Vcc Sink
1
2
34
5
Vref
TS4436
Electrical Characteristics TS4436
4/8
3 Electrical Characteristics
Note: Limits are 100% production tested at 25°C. Limits over temperature are guaranteed through
correlation and by design.
Table 3. Electrical characteristics for Tamb = 25°C, VCC = 1.8V, ISINK = 2mA unless
otherwise specified
Symbol Parameter Test Conditions Min. Typ. Max. Unit
Vref
Reference voltage
TS4436A 0.5%
0.597 0.6 0.603
V
-40°C < T < +85°C 0.589 0.611
Vref
Reference voltage
TS4436 1%
0.594 0.6 0.606 V
-40°C < T < +85°C 0.589 0.6 0.611
TCTemperature coefficient 150 ppm/°C
RegLine Change in Vref due to
change in VCC
VCC=1.7 to 10V 1 2.5
mV
-40°C < T < +85°C 2 3
RegLoad Change in Vref due to
change in ISINK
ISINK=0.1 to 20mA 3.5 7 mV
-40°C < T < +85°C 10
ICC Supply current ISINK=2mA 150 200
µA
-40°C < T < +85°C 250
IREF
Change in Iref Reference
input current due to
change in ISINK
0.1< ISINK < 10mA 20 50
nA
-40°C < T < +85°C 65
VSAT
Output transistor
saturation voltage
ISINK=5mA 30 50
mV
-40°C < T < +85°C 60
ISINK=20mA 90 120
-40°C < T < +85°C 140
IOH Output leakage current
VSINK=VCC 0.05
µA
-40°C < T < +85°C 0.1
Electrical Characteristics TS4436
5/8
Figure 2. Vref vs. temperature Figure 3. Vref vs. temperature
Figure 4. ICC vs. temperature Figure 5. ICC at 25°C
Figure 6. VSAT vs. temperature Figure 7. Vref vs. temperature
0.5995
0.6
0.6005
0.601
0.6015
0.602
-40 -20 0 25 50 85
Temperature (°C)
Vref (V)
Vcc=1.8V Isink=2mA
0.5995
0.6
0.6005
0.601
0.6015
0.602
-40 -20 0 25 50 85
Temperature (°C)
Vref (V)
Vcc=10V Isink=2mA Vcc=1.7V Isink=2mA
0
50
100
150
200
250
-40-20 0 255085
Temperature (°C)
Icc (µA)
Vcc=1.8V Isink=2mA
0
10
20
30
40
50
60
Icc < 160 Icc < 165 Icc < 170 Icc < 175
Icc range (µA)
Number of produc
t
Vcc=1.8V Isink=2mA
0
10
20
30
40
50
60
70
80
-40 -20 0 25 50 85
Temperature (°C)
Vsat (mV)
Vcc=1.8V Isink=20mA Vcc=1.8V Isink=5mA
0.594
0.596
0.598
0.6
0.602
0.604
0.606
0.608
0.61
0.612
-40 -20 0 25 50 85
Temperature (°C)
Vref (V)
Vcc=1.8V Isink 0.1mA Vcc=1.8V Isink 20mA
Package Mechanical Data TS4436
6/8
4 Package Mechanical Data
In order to meet environmental requirements, ST offers these devices in ECOPACK®
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.
SC70 Package
DIM.
mm. mils
MIN. TYP MAX. MIN. TYP. MAX.
A 0.80 1.10 31.5 43.3
A1 0.00 0.10 0.0 3.9
A2 0.80 1.00 31.5 39.4
b 0.15 0.30 5.9 11.8
C 0.10 0.18 3.9 7.1
D 1.80 2.20 70.9 86.6
E 1.80 2.40 70.9 94.5
E1 1.15 1.35 45.3 53.1
e.65 25.6
e1 1.3 51.2
L 0.10 0.30 3.9 11.8
SOT323-5L MECHANICAL DATA
0
TS4436 Revision History
7/8
5 Revision History
Table 4. Document revision history
Date Revision Changes
Feb. 2006 1First release of datasheet.
TS4436
8/8
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