LX432
L
OW
V
OLTAGE
A
DJUSTABLE
P
RECISION
S
HUNT
R
EGULATORS
T
H E
I
N F I N I T E
P
O W E R
O F
I
N N O VA T I O N
P
R O D U C T I O N
D
A T A
S
H E E T
DESCRIPTION
The LX432 series are low-voltage pre-
cision 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 im-
pedance for improved load regula-
tion
鈥?typical output impedance is
250m鈩? The LX432 series operates with
an operating current as low as 80碌A,
making these devices suitable for por-
table and micropower applications.
Low voltage operation enables the
LX432 to be used in the feedback loop
of isolated low voltage power sup-
plies.
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 10.
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.
s
s
s
s
K E Y F E AT U R E S
Low Voltage Operation: 1.24V Reference
Initial Voltage Reference Accuracy 1%
Adjustable Output Voltage From V
REF
To 20V
Typical Output Dynamic Impedance Less
Than 250m鈩?/div>
s
Sink Current Capability 80碌A To 20mA
s
Direct Alternative To TLV431
A P P L I C AT I O N S
s
s
s
s
Low Voltage Adjustable Power Supplies
Instrumentation
Computers
Portable Equipment
IMPORTANT:
For the most current data, consult LinFinity's web site:
http://www.linfinity.com.
PRODUCT HIGHLIGHT
T
Y P I C A L
P
R O G R A M M A B L E
V
O LTA G E
R
EFERENCE
C
IRCUIT
V
IN
Cathode
V
KA
R1
Reference
LX432
Anode
R2
GND
PA C K A G E O R D E R I N F O R M AT I O N
T
A
(掳C)
0 to 70
-40 to 85
SC
Plastic SOT-23
3-pin
LX432CSC
LX432ISC
SE
Plastic SOT-23
5-pin
LX432CSE
LX432ISE
LP
Plastic TO-92
3-pin
LX432CLP
LX432ILP
Note: All surface-mount packages are available in Tape & Reel.
Append the letter "T" to part number. (i.e. LX432CSET)
TO-92 (LP) package also available in ammo-pack.
Copyright 漏 1999
Rev. 1.0 9/99
L
IN
F
INITY
M
ICROELECTRONICS
I
NC
.
11861 W
ESTERN
A
VENUE
, G
ARDEN
G
ROVE
, CA. 92841, 714-898-8121, F
AX
: 714-893-2570
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