Microsemi

Integrated Products Division

11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570

Page 1

Copyright

© 2000

Rev. 1.3, 2005-02-24

LX432

Low Voltage Adjustable Precision Shunt Regulator

TM

®

DESCRI PTI O N

The LX432 series are low-voltage

precision adjustable shunt regulators with

a reference voltage of 1.24V. The output

voltage may be set to any value between

1.24V and 20V by two external resistors.

These

devices

offer

low

output

impedance for improved load regulation –

typical output impedance is 200m

Ω. The

LX432 series operates with an operating

current as low as 80µA, making these

devices

suitable

for

portable

and

micropower applications.

Low voltage operation enables the

LX432 to be used in the feedback loop of

isolated low voltage power supplies. The

minimum output voltage is determined by

the LX432 output voltage plus the forward

voltage drop of the opto-coupler LED

(typically 1.24 + 1.4 = 2.64V minimum).

See figure 12.

The LX432 is offered in 3 lead SOT-23

or TO-92 packages, and is a drop-in

replacement for the TLV431 and SC431L

devices.

IMPORTANT: For the most current data, consult MICROSEMI’s website: http://www.microsemi.com

KEY FEATUR ES

Low Voltage Operation:

1.24V Reference

Initial Voltage Reference

Accuracy 1%

Adjustable Output Voltage

From VREF to 20V

Typical Output Dynamic

Impedance Less Than

250mΩ

Sink Current Capability

80µA To 20mA

Direct Alternative To

TLV431

APPLI CATI ONS

Low Voltage Adjustable

Power Supplies

Instrumentation

Computers

Portable Equipment

PRODUCT H I GHLIGHT

R2

R1

GND

V

KA

V

IN

LX432

Reference

Cathode

Anode

PACKAGE ORDER I N FO

SC

Plastic SOT-23

3-Pin

LP

Plastic TO-92

3-Pin

SC

Package

Marking

RoHS Compliant / Pb-free

Transition DC: 0503

RoHS Compliant / Pb-free

Transition DC: 0509

0 to 70

432C

LX432CSC

LX432CLP

-40 to 85

432I

LX432ISC

LX432ILP

Note: Available in Tape & Reel. Append the letters “TR” to the part number. (i.e. LX432CSC-TR)

TO-92 (LP) package also available in ammo-pack.