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

2

PGND

GND

REF

5

(SMPS).

It integrates a 0.6V voltage reference, an

34

VSINK

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

P

T

SINK

diss

STD

Output sink current 30 mA

Supply voltage 12 V

CC

Output voltage 12 V

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

=150°C and

1. P

2. P

T

LEAD

R R

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