
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
W
M
.
LX432
Low Voltage Adjustable Precision Shunt
Regulator
P
RODUCTION
D
ATA
S
HEET
A M I C R O S E M I C O M P A N Y
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 80μA, making these
devices
suitable
for
micropower applications.
portable
and
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
MICROSEMI
’s website:
http://www.microsemi.com
Low Voltage Operation:
1.24V Reference
Initial Voltage Reference
Accuracy 1%
Adjustable Output Voltage
From VREF to 20V
Typical Output Dynamic
Impedance Less Than
250m
Sink Current Capability
80μA To 20mA
Direct Alternative To
TLV431
Low Voltage Adjustable
Power Supplies
Instrumentation
Computers
Portable Equipment
R2
R1
GND
V
KA
V
IN
LX432
Reference
Cathode
Anode
T
A
(
°
C)
SC / SE
Package Marking
SC
Plastic SOT-23
3-Pin
SE
Plastic SOT-23
5-Pin
LP
Plastic TO-92
3-Pin
0 to 70
-40 to 85
432C
432I
LX432CSC
LX432ISC
Note: Available in Tape & Reel.
Append the letter “T” to the part number. (i.e. LX432CSET)
TO-92 (LP) package also available in ammo-pack.
LX432CSE
LX432ISE
LX432CLP
LX432ILP
L
X
4
3
2