Microsemi

Linfinity Microelectronics Division

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

Page 1

Copyright

2000

Rev. 1.2c, 2001-04-11

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

. The

LX432 series operates with an operating

current as low as 80A, 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 and 5-Pin

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