OF

1

Copyright

© 1999

Rev. 1.4a,2005-04-04

LX6431 / 6431A / 6431B

DESCRI PTI O N

The LX6431 series precision adjustable three

terminal shunt voltage regulators are pin-to-pin

compatible with the industry standard TL431, but

with significant improvements.

The LX6431

design has eliminated regions of instability

common to older generation shunt regulator

products like the TL431. Designs are made simpler

by eliminating the task of insuring capacitive loads,

and output voltage and cathode currents don’t

combine for unstable operation.

The capacitor

value is chose simply to give the best load transient

response without the possibility of instability. A

lower reference input current allows the use of

higher value reference divider resistors, reducing

the current drain from batteries in portable

equipment as well as reducing the voltage

programming errors due to the impedance of the

divider network (See product Highlight)

In addition, the LX6431B has an improved

initial accuracy of 0.4%, and the output voltage is

programmable by using two external resistors

from 2.5V to 36V.

These devices offer low output impedance for

improved load regulation.

The typical output

impedance of these devices is 100mΩ.

The

reduced reference input bias current and minimum

operating currents make these devices suitable for

portable and micro power applications.

IMPORTANT:

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

KEY FEATUR ES

Unconditionally Stable for All

Cathode To Anode Capacitance

Values

Reduced Reference Input

Current Allowing The Use of

Higher Value Divider Resistors

(0.5µA)

Initial Voltage Reference

Accuracy of 0.4% (LX6431B)

Sink Current Capability 0.6mA to

100mA

Typical Output Dynamic

Impedance Less Than 100mΩ

Adjustable Output Voltage From

2.5V to 36V

PRODUCT H I GHLIGHT

PACKAGE ORDER INFO

PK

Plastic TO-89

3-Pin

DM

Plastic SOIC

8-Pin

LP

Plastic TO-92

3-Pin

°C)

Initial

Transition D/C: 0518

RoHS Compliant / Pb-free

Transition D/C: 0440

RoHS Compliant / Pb-free

Transition D/C: 0509

2%

LX6431CPK

LX6431CDM

LX6431CLP

1%

LX6431ACPK

LX6431ACDM

LX6431ACLP

0 to 70

0.4%

LX6431BCPK

LX6431BCDM

LX6431BCLP

2%

LX6431IPK

LX6431IDM

LX6431ILP

1%

LX6431AIPK

LX6431AIDM

LX6431AILP

-40 to 85

0.4%

LX6431BIPK

LX6431BIDM

LX6431BILP

Note: Available in Tape & Reel. Append the letters “TR” to the part number. (i.e. LX6431CDM-TR)