DESCRIPTION

KEY FEA TURES

s

s

s

s

s Three-Terminal Adjustable Or Fixed

Output Voltage

s

s

s

s

s Guaranteed 1% Voltage Reference

Accuracy Over Line, Load And

Temperature (LX8385B)

s

s

s

s

s Guaranteed < 1.5V Headroom At 3A

(LX8385)

s

s

s

s

s Guaranteed < 1.3V Headroom At 3A

(LX8385A/8385B)

s

s

s

s

s Output Current Of 3A Minimum

p 0.015% Line Regulation

p 0.1% Load Regulation

The LX8385/8385A/8385B series ICs are

positive regulators designed to provide

3A output current. Each regulator yields

higher efficiency than currently available

devices with all internal circuitry designed

to operate down to a 1V input-to-output-

differential. In these products, the drop-

out voltage is fully specified as a function

of load current. The LX8385's dropout is

guaranteed at a maximum of 1.5V at maxi-

mum output current, decreasing at lower

load currents. The LX8385A/85B have a

maximum dropout voltage of 1.3V.

The LX8385B offers a tighter voltage

reference tolerance: ±1.0% over line, load

and temperature, with 0.8% initial accu-

racy. The LX8385/85A have 1.0% initial

accuracy, with 2% over line, load and tem-

perature.

The LX8385/85A/85B series devices are

pin-compatible with earlier 3-terminal

regulators, such as 117 series products.

While a 10µF output capacitor is required

on both input and output of these new

devices, this is generally included in most

regulator designs.

The quiescent current of the LX8385/

85A/85B series products flows into the

load, increasing efficiency. This feature

contrasts with PNP regulator designs,

where up to 10% of the output current is

wasted as quiescent current.

The LX8385-xxI is rated for -25°C to

+125°C applications, and the LX8385-xxC

/8385B-xxC is rated for 0°C to +125°C

applications.

PRODUCT HIGHLIGHT

APPLICA TIONS

s High Efficiency Linear Regulators

s Post Regulators For Switching

Power Supplies

s Battery Chargers

s Constant Current Regulators

s Graphics & Standard Supplies

s Processor I/O Supply

s Low Voltage Memory & Chipset Supplies

OF

LX8385-xx/8385A-xx/8385B-xx

LX8385

200

Ω

1%

1%

3.3V at 3A

5V

OUT

IN

ADJ

1500µF, 6.3V

6MV1500GX

2x 1500µF, 6.3V

6MV1500GX

from Sanyo

121

Ω

Note: All surface-mount packages are available in Tape & Reel. Append the letter "T" to part number

(i.e. LX8385-00CDDT).

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

* Consult factory for availability of TO-3 Metal Can.

LX8385/85A/85B-00

Adjustable

LX8385/85A/85B-33

3.3V

LX8385/85A/85B-05

5.0V

Part #

Output

Voltage

Other voltage options may be available —

Please contact factory for details.

P ACKAGE ORDER INFORMA TION *

T

P

1.5V

LX8385-xxCP

LX8385-xxCD

0 to 125

1.3V

LX8385A-xxCP

LX8385A-xxCD

1.3V

LX8385B-xxCP

LX8385B-xxCD

-25 to 125

1.5V

LX8385-xxIP

LX8385-xxID

Dropout

Voltage

Plastic TO-220

3-pin

Plastic TO-263

3-pin

DD

Copyright © 1999

Rev. 2.0a 10/00

1

NOTE: For current data & package dimensions, visit our web site: http://www.linfinity.com.