Microsemi Inc.

Integrated Products Division

11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570

Page 1

Copyright

© 2000

Rev. 2.1f, 2006-01-20

LX8384x-xx

5A Low Dropout Positive Regulators

TM

®

DESCRIPTION

The LX8384/84A/84B Series ICs are

positive regulators designed to provide 5A

output current. These regulators yield

higher efficiency than currently available

devices with all internal circuitry designed

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

differential. In each of these products, the

dropout voltage is fully specified as a

function of load current. Dropout is

guaranteed at a maximum of 1.3V (8384A)

and 1.5V (8384) at maximum output

current, decreasing at lower load currents.

In addition, on-chip trimming adjusts the

reference voltage tolerance to 1% maximum

at room temperature and 2% maximum over

the 0 to 125°C range for the LX8384A,

making this ideal for the Pentium P54C-

VRE specification. The LX8384B offers

0.8% tolerance at room temperature and

1.0% maximum over line, load and

temperature.

Fixed versions are also

available and specified in the Available

Options table below.

The LX8384/84A/84B Series devices are

pin-compatible

with

earlier

3-terminal

regulators, such as the 117 series products,

but they do require input and output

capacitors. A minimum 10µF capacitor is

required on the input and a 15µF or greater

on the output of these new devices for

stability. Although, these capacitors are

generally

included

in

most

regulator

designs.

The LX8384/84A/84B 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 LX8384-xxI is specified over

the industrial temperature range of -25°C to

125°C,

while

the

LX8384-xxC/84A-

xxC/84B-xxC

is

specified

over

the

commercial range of 0°C to 125°C.

IMPORTANT:

PRODUCT H I GHLIGHT

*1500µF

6MV1500GX

Sanyo

121

Ω

0.1%

218

Ω

0.1%

IN

ADJ

OUT

5V

3.5V

at 5A

1500µF

5x 6MV1500GX

Sanyo

+

+

* Capacitors must have < 20m

Ω

Total ESR for the VRE Specification

LX8384A

An Application of the LX8384A for the Pentium P54C Processors Meeting VRE Specification.

KEY FEATUR ES

Three-Terminal Adjustable Or

Fixed Output

Guaranteed < 1.3V Headroom a

5A (LX8384A)

Guaranteed 2.0% Max.

Reference Tolerance (LX8384A)

Guaranteed 1.0% Max.

Reference Tolerance (LX8384B)

0.015% Line Regulation

0.15% Load Regulation

APPLICATIONS

Pentium

Application

High Efficiency Linear

Regulators

Power Regulators For Switching

Power Supplies

Battery Chargers

Constant Current Regulators

Cyrix

AMD-K5™

PART #

OUTPUT

VOLTAGE

LX8384/84A/84B-00

Adjustable

LX8384/84A/84B-15

1.5V

LX8384/84A/84B-33

3.3V

Table 1

- Available Options

PACKAGE ORDER INFO

DT

Plastic TO-252

(D-Pak) 3-Pin

P

Plastic TO-220

3-Pin

DD

Plastic TO-263

3-Pin

Max Ref

Accuracy

Max Dropout

Voltage

RoHS Compliant

Transition DC: 0532

RoHS Compliant

Transition DC: 0543

RoHS Compliant

Transition DC: 0535

2.0%

1.5V

LX8384-xxCDT

LX8384-xxCP

LX8384-xxCDD

2.0%

1.3V

LX8384A-xxCDT

LX8384A-xxCP

LX8384A-xxCDD

0 to 125

1.0%

1.3V

LX8384B-xxCDT

LX8384B-xxCP

LX8384B-xxCDD

-25 to 125

2.0%

1.5V

LX8384-xxIDT

LX8384-xxIP

LX8384-xxIDD

Note: Available in Tape & Reel. Append the letters “TR” to the part number. (i.e. LX8384-xxCP-TR)