DESCRIPTION

KEY FEA TURES

s THREE-TERMINAL ADJUSTABLE OR FIXED

OUTPUT

s GUARANTEED < 1.3V HEADROOM AT 5A

(LX8384A-xx)

s GUARANTEED 2.0% MAX. REFERENCE

TOLERANCE (LX8384A-xx)

s GUARANTEED 1.0% MAX. REFERENCE

TOLERANCE (LX8384B-xx)

s OUTPUT CURRENT OF 5A MINIMUM

p 0.015% LINE REGULATION

p 0.15% LOAD REGULATION

The LX8384/84A/84B Series ICs are posi-

tive 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. 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 LX8384/84A/84B Series quiescent

current flows into the load, thereby

increasing efficiency.

This feature

constrasts 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.

APPLICA TIONS

s HIGH EFFICIENCY LINEAR REGULATORS

s POST REGULATORS FOR SWITCHING POWER

SUPPLIES

s BATTERY CHARGERS

s CONSTANT CURRENT REGULATORS

OF

LX8384-xx/8384A-xx/8384B-xx

PRODUCT HIGHLIGHT

LX8384A

218

Ω

0.1%

0.1%

3.5V at 5A

have < 20m

Ω Total ESR.

5V

OUT

IN

ADJ

6MV1500GX

Sanyo

1500µF

*

5x 6MV1500GX

Sanyo

121

Ω

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

(i.e. LX8384A-xxCDDT)

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

An application of the LX8384A for the Pentium P54C processors meeting VRE specfication.

P ACKAGE ORDER INFORMA TION

T

Plastic TO-220

3-pin

P

Plastic TO-263

3-pin

DD

2.0%

1.5V

LX8384-xxCP

LX8384-xxCDD

0 to 125

2.0%

1.3V

LX8384A-xxCP

LX8384A-xxCDD

1.0%

1.3V

LX8384B-xxCP

LX8384B-xxCDD

-25 to 125

2.0%

1.5V

LX8384-xxIP

LX8384-xxIDD

Max. Dropout

Voltage

Max. Ref.

Accuracy

LX8384/84A/84B-00

Adjustable

LX8384/84A/84B-15

1.5V

LX8384/84A/84B-33

3.3V

Part #

Output

Voltage

Other voltage options may be available —

Please contact factory for details.

Copyright © 1997

Rev. 1.9

12/97

1

IMPORTANT: For the most current data, consult LinFinity's web site: http://www.linfinity.com.