LX6431BIDM Datasheet LX6431ACDM, LX6431ACLP, LX6431AIDM | P1-P3

P

RODUCTION

D

ATA

S

HEET

T

HE

I

NFINITE

P

OWER OF

I

NNOVATION

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

1

Rev. 1.4a,2005-04-04

LX6431 / 6431A / 6431B

P

RECISION

P

ROGRAMMABLE

R

EFERENCES

DESCRIPTION

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 FEATURES



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 HIGHLIGHT

Output Voltage Error Due to I

REF

PACKAGE ORDER INFO

PK

Plastic TO-89

3-Pin

DM

Plastic SOIC

8-Pin

LP

Plastic TO-92

3-Pin

T

A

(°C)

Initial

Tolerance

RoHS Compliant / Pb-free

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)

P

RODUCTION

D

ATA

S

HEET

T

HE

I

NFINITE

P

OWER OF

I

NNOVATION

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

2

Rev. 1.4a,2005-04-04

LX6431 / 6431A / 6431B

P

RECISION

P

ROGRAMMABLE

R

EFERENCES

ABSOLUTE MAXIMUM RATINGS

Cathode to Anode Voltage (V

KA

).................................................................... -0.3V to 37V

Reference Input Current (I

REF

) .....................................................................-50µA to 10µA

Continuous Cathode Current (I

K

)........................................................... -100mA to 150mA

Operating Temperature Range ................................................................................... 150°C

Maximum Operating Junction Temperature

Plastic (DM & LP Packages) ..................................................................................... 150°C

Storage Temperature Range.........................................................................-65°C to 150°C

Package Peak Temp. for Solder Reflow (40 seconds maximum exposure) ... 260°C (+0 -5)

Note: Exceeding these ratings could cause damage to the device. All voltages are with respect to

Ground. Currents are positive into, negative out of specified terminal

.

Pin numbers refer to DIL packages only.

THERMAL DATA

DM

Plastic SOIC 8-Pin

THERMAL RESISTANCE

-

JUNCTION TO

A

MBIENT

,

θ

JA

165°C/W

LP

Plastic TO-92 3-Pin

THERMAL RESISTANCE

-

JUNCTION TO

A

MBIENT

,

θ

JA

156°C/W

PK

Plastic TO-89 3-Pin

THERMALRESISTANCE

-

JUNCTION TO TAB

,

θ

JT

35°C/W

THERMAL RESISTANCE

-

JUNCTION TO

A

MBIENT

,

θ

JA

71°C/W

Junction Temperature Calculation: T

J

= T

A

+ (P

D

x θ

JA

).

The θ

JA

numbers are guidelines for the thermal performance of the device/pc-board system. All of the

above assume no ambient airflow.

PACKAGE PIN OUT

CATHODE

N.C.

ANODE

N.C. N.C.

ANODE

REF

1

2

3

4

5

6

7

8

DM

P

ACKAGE

(Top View)

1

CATHODE

2

3

ANODE

REF

LP

P

ACKAGE

(Top View)

REF

ANODE

CATHODE

1

2

3

PK

P

ACKAGE

(Top View)

N.C. – No Connection

RoHS / Pb-free 100% Matte Tin Lead Finish

SIMPLIFIED BLOCK DIAGRAM

+

-

V

REF

REF(R)

Cathode (K)

Anode (A)

P

RECISION

P

ROGRAMMABLE

R

EFERENCES

LX6431/LX6431A/LX6431B

PRODUCT DATABOOK 1996/1997

3

Rev. 1.4a

P RODUCTION DATA SHEET

ELECTRICAL CHARACTERISTICS (Note 2)

(Unless otherwise specified, these specifications apply over the operating ambient temperatures for LX6431C/LX6431AC/LX6431BC with 0°C ≤ T

A

≤

70°C, LX6431I/LX6431AI/LX6431BI with -40°C ≤ T

A

≤ 85°C.)

Parameter

Symbol

Test Conditions

LX6431

Units

Min. Typ. Max.

2440 2550 mV

2470 2520 mV

2490 2510 mV

15 mV

25 mV

15 mV

25 mV

15 mV

20 mV

0.3 1 mV/V

0.1 0.5 µA

0.4 0.6 mA

0.3 1 µA

30 100 mΩ

Reference Input Voltage LX6431 V

REF

I

K

= 10mA, V

KA

= V

REF

, T

A

= 25°C,

LX6431A I

K

= 10mA, V

KA

= V

REF

, T

A

= 25°C

LX6431B I

K

= 10mA, V

KA

= V

REF

, T

A

= 25°C

Reference Drift LX6431 I

K

= 10mA, V

KA

= V

REF

, 0°C ≤ T

A

≤ 70°C

I

K

= 10mA, V

KA

= V

REF

, -40°C ≤ T

A

≤ 85°C

LX6431A I

K

= 10mA, V

KA

= V

REF

, 0°C ≤ T

A

≤ 70°C

I

K

= 10mA, V

KA

= V

REF

, -40°C ≤ T

A

≤ 85°C

LX6431B I

K

= 10mA, V

KA

= V

REF

, 0°C ≤ T

A

≤ 70°C

I

K

= 10mA, V

KA

= V

REF

, -40°C ≤ T

A

≤ 85°C

Voltage Ratio, Reference to Cathode I

K

= 10mA, V

KA

= 2.5V to 36V, T

A

= 25°C

(Note 3) I

K

= 10mA, V

KA

= 2.5V to 36V, T

A

= Operating Range

Reference Input Current I

REF

V

KA

= V

REF

, T

A

= 25°C

V

KA

= V

REF

, T

A

= Operating Range

Minimum Operating Current I

MIN

V

KA

= V

REF

to 36V, T

A

= 25°C

V

KA

= V

REF

to 36V, T

A

= Operating Range

Off-State Cathode Current I

OFF

V

KA

= 36V, V

REF

= 0V, T

A

= 25°C

Dynamic Impedance Z

KA

V

KA

= V

REF

, I

K

= 0.6mA to 100mA, f ≤ 1kHz, T

A

= 25°C

Note 2. These parameters are guaranteed by design.

Note 3. Ratio of change in reference input voltage

to the change in cathode voltage.

∆V

REF

∆V

KA

LX6431BIDM

LX6431BIDM

Products related to this Datasheet