DESCRIPTION

KEY FEA TURES

s THREE-TERMINAL ADJUSTABLE OR FIXED

OUTPUT VOLTAGE

s GUARANTEED < 1.3V HEADROOM AT

7.5A (LX8383A/8383B)

s GUARANTEED < 1.5V HEADROOM AT

7.5A (LX8383)

s OUTPUT CURRENT OF 7.5A MINIMUM

p 0.015% LINE REGULATION

p 0.15% LOAD REGULATION

s EVALUATION BOARD AVAILABLE:

REQUEST LXE9001 EVALUATION KIT

The LX8383/8383A/8383B series ICs are

positive regulators designed to provide

7.5A output current. All internal circuitry

is designed to operate down to a 1V in-

put-to-output differential, so the LX8383/

83A/83B can operate with greater effi-

ciency than previously available devices.

The dropout voltage for each product is

fully specified as a function of load cur-

rent. Dropout is guaranteed at a maxi-

mum of 1.3V for the LX8383A/83B and

1.5V for the LX8383, at maximum output

current, decreasing at lower load currents.

Fixed versions are also available and speci-

fied in the Available Options table below.

The LX8383B offers a tighter voltage ref-

erence tolerance: 0.8% initial accuracy and

1% over line, load and temperature. The

LX8383/83A have 1% initial accuracy and

2% over line, load and temperature.

The LX8383/83A/83B series devices are

pin-compatible with earlier 3-terminal

regulators, such as the 117 series prod-

ucts. While a 10µF output capacitor is

required on both input and output of these

new devices, this capacitor is generally

included in most regulator designs.

The LX8383/83A/83B series quiescent

current flows into the load, thereby

increasing efficiency.

This feature

contrasts with PNP regulators, where up

to 10% of the output current is wasted as

quiescent current. The LX8383I/8383AI is

specified over the industrial temperature

range of -25°C to +125°C and the

LX8383C/8383AC/8383BC is specified

over the commercial range of 0°C to

+125°C.

OF

Copyright © 1996

Rev. 1.0

12/96

LX8383-xx/8383A-xx/8383B-xx

1

APPLICA TIONS

s HIGH EFFICIENCY LINEAR REGULATORS

s POST REGULATORS FOR SWITCHING

POWER SUPPLIES

s BATTERY CHARGERS

s CONSTANT CURRENT REGULATORS

P ACKAGE ORDER INFORMA TION

T

Plastic TO-220

3-pin

P

Plastic TO-247

3-terminal

V

1.5V

LX8383-xxCP

LX8383-xxCV

0 to 125

1.3V

LX8383A-xxCP

LX8383A-xxCV

1.3V

LX8383B-xxCP

LX8383B-xxCV

-25 to 125

1.5V

LX8383-xxIP

LX8383-xxIV

1.3V

LX8383A-xxIP

LX8383A-xxIV

Application of the LX8383A for the standard voltage (non VRE) Pentium Processor motherboard

with less than 130mV dynamic response to a 7.5A load transient.

PRODUCT HIGHLIGHT

LX8383A

205

Ω

1%

1%

3.38V at 7.5A

V

OUT

IN

ADJ

1500µF

6.3V

6MV1500GX

from Sanyo

2x 330µF, 6.3V

Oscon SA type

from Sanyo

-or-

3x 1500µF, 6.3V

6MV1500GX

from Sanyo

121

Ω

Dropout

Voltage

FOR FUR THER INFORMA TION CALL (714) 898-8121

LX8383/83A/83B-00

Adjustable

LX8383/83A/83B-33

3.3V

Part #

Output

Voltage

Other voltage options may be available —

Please contact factory for details.

"xx" refers to output voltage, please see table above.