ST TS4436 User Manual

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

TS4436

SC70

(Plastic Micropackage)

Pin connections (top view)

Description

The TS4436 is a four-terminal device dedicated to
low voltage Switch Mode Power Supplies

1

1

2

2

PGND

PGND

GND

GND

REF

REF

5

5

(SMPS).

It integrates a 0.6V voltage reference, an

34

VSINK

VSINK

CC

CC

34

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

Applications

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

■ Low voltage switch mode power supplies

■ Isolated DC/DC converter

■ Computers

■ Low voltage discrete regulators

it to be used in series with the optocoupler in an
SMPS for regulation up to a 1.8V output voltage.

Order Codes

Part Number Accuracy Temperature Range Package Packing Marking

TS4436AICT 0.5%

-40, +85°C SC70 Tape & Reel

TS4436ICT 1% L21

L22

March 2006 Revision 1 1/8

www.st.com

8

Absolute Maximum Ratings and Operating Conditions TS4436

1 Absolute Maximum Ratings and Operating

Conditions

Table 1. Key parameters and their absolute maximum ratings

Symbol Parameter Value Unit

I

SINK

V

V

P

P

T

SINK

diss

diss

STD

Output sink current 30 mA

Supply voltage 12 V

CC

Output voltage 12 V

Power Dissipation

Power Dissipation

(1)

SOT23-5

(2)

SC70

310 mW

Storage Temperature -65 to +150 °C

Human Body Model (HBM) 2 kV

ESD

Machine Model (MM) 200 V

Lead Temperature (soldering, 10 seconds) 250 °C

has been calculated with T

= 250°C/W for the SOT23-5 package
= 81°C/W for the SOT23-5 package

has been calculated with T

= 250°C/W for the SOT23-5 package
= 81°C/W for the SOT23-5 package

= 25°C, T

AMB

= 25°C, T

AMB

Junction

Junction

=150°C and

=150°C and

1. P

2. P

T

LEAD

R
R

R
R

diss
thJA
thJC

diss
thJA
thJC

Table 2. Operating conditions

Symbol Parameter Value Unit

T

OPER

V

I

SINK

Operating temperature range -40 to +85 °C

Supply voltage 1.7 to 10 V

CC

Output sink current up to 20 mA

mW

2/8

Typical Application Schematic TS4436

2 Typical Application Schematic

Figure 1. SMPS power supply: secondary side

R1

Cd1
100nF

D1

L1

D2

Vcc

Vref

Gnd

2

TS4436

C1

Sink

Pgnd

Ref

34

1

5

Vout

R2

R3

3/8

Electrical Characteristics TS4436

3 Electrical Characteristics

Table 3. Electrical characteristics for T

otherwise specified

Symbol Parameter Test Conditions Min. Typ. Max. Unit

= 25°C, V

amb

= 1.8V, I

CC

= 2mA unless

SINK

V

ref

V

ref

T

C

RegLine

RegLoad

I

CC

I

REF

V

SAT

Reference voltage
TS4436A 0.5%

Reference voltage
TS4436 1%

-40°C < T < +85°C 0.589 0.611

-40°C < T < +85°C 0.589 0.6 0.611

0.597 0.6 0.603
V

0.594 0.6 0.606
V

Temperature coefficient 150 ppm/°C

Change in V
change in V

Change in V
change in I

ref

CC

ref

SINK

Supply current

due to

due to

VCC=1.7 to 10V 1 2.5

-40°C < T < +85°C 2 3

I

=0.1 to 20mA 3.5 7

SINK

-40°C < T < +85°C 10

=2mA 150 200

I

SINK

mV

mV

µA

-40°C < T < +85°C 250

Change in I
input current due to
change in I

Output transistor
saturation voltage

Reference

ref

SINK

0.1< I

< 10mA 20 50

SINK

-40°C < T < +85°C 65

I

=5mA 30 50

SINK

-40°C < T < +85°C 60

=20mA 90 120

I

SINK

nA

mV

-40°C < T < +85°C 140

I

OH

Output leakage current

V

SINK=VCC

-40°C < T < +85°C 0.1

0.05
µA

Note: Limits are 100% production tested at 25°C. Limits over temperature are guaranteed through

correlation and by design.

4/8

Electrical Characteristics TS4436

t

Figure 2. V

0.602

0.6015

0.601

0.6005

Vref (V)

0.6

0.5995

Figure 4. I

250

200

150

100

Icc (µA)

50

0

vs. temperature Figure 3. V

ref

0.602

0.6015

0.601

0.6005

Vref (V)

0.6

0.5995

-40 -20 0 25 50 85

Temperature (°C)

Vcc=1.8V Isink=2mA

vs. temperature Figure 5. ICC at 25°C

CC

-40-20 0 255085

Temperature (°C)

Vcc=1.8V Isink=2mA

Vcc=10V Isink=2mA Vcc=1.7V Isink=2mA

60

50

40

30

20

Number of produc

10

0

vs. temperature

ref

-40 -20 0 25 50 85

Icc < 160 Icc < 165 Icc < 170 Icc < 175

Temperature (°C)

Icc range (µA)

Vcc=1.8V Isink=2mA

Figure 6. V

80

70

60

50

40

30

Vsat (mV)

20

10

0

Vcc=1.8V Isink=20mA Vcc=1.8V Isink=5mA

vs. temperature Figure 7. V

SAT

-40 -20 0 25 50 85

Temperature (°C)

5/8

vs. temperature

ref

0.612

0.61

0.608

0.606

0.604

0.602

Vref (V)

0.6

0.598

0.596

0.594

-40 -20 0 25 50 85

Temperature (°C)

Vcc=1.8V Isink 0.1mA Vcc=1.8V Isink 20mA

Package Mechanical Data TS4436

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

SOT323-5L MECHANICAL DATA

.

DIM.

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

e1 1.3 51.2

L 0.10 0.30 3.9 11.8

MIN. TYP MAX. MIN. TYP. MAX.

mm. mils

.65

0

25.6

6/8

TS4436 Revision History

5 Revision History

Table 4. Document revision history

Date Revision Changes

Feb. 2006 1 First release of datasheet.

7/8

TS4436

y

y

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