Copyright

 ANPEC Electronics Corp.

Rev. A.8 - Oct., 2003

APL5331

www.anpec.com.tw

2

P a ckage C o d e

K : SO P-8

KA : SO P-8 -P

U 5 : T O -252-5

G 5 : T O -263-5

T e m p . R ang e

H andling C o d e

T R : T ape & R e el

Lead F ree C ode

L : Lead F ree D e v ice

B lank : O rginal D e v ice

A P L5 33 1

H andling C o d e

T e m p . R ang e

P a ckage C o d e

A P L5331

XX XXX

A P L 5331K C -T R :

A P L5331 K A C -T R :

XX XXX - D a te C o d e

A P L5331

XX XXX

A P L5331 U 5 C -T R :

A P L5331 G 5 C -T R :

XX XXX - D a te C o d e

Lead F ree C ode

Ordering and Marking Information

Pin Description

PIN NAME

I/O

DESCRIPTION

VIN

I

Main power input pin. Connect this pin to a voltage source and an input

capacitor. The APL5331 sources current to VOUT pin by controlling the upper

NPN pass transistor, providing a current path from VIN pin.

GND

O

Power and signal ground. Connect this pin to system ground plane with shortest

traces. The APL5331 sinks current from VOUT pin by controlling the lower NPN

pass transistor, providing a current path to GND pin. This pin is also the ground

path for internal control circuitry.

VCNTL

I

Power input pin for internal control circuitry. Connect this pin to a voltage source,

providing a bias for the internal control circuitry. A bypass capacitor is usually

connected near this pin.

VREF

I

Reference voltage input and active-low shutdown control pin. Apply a voltage to

this pin as a reference voltage for the APL5331. Connect this pin to a resistor

divider, between VIN and GND, and a capacitor for soft-start and filtering noise

purposes. Applying and holding this pin low by an open-drain transistor to shut

down the output.

VOUT

O

Output pin of the regulator. Connect this pin to load. Output capacitors

connected this pin improves stability and transient response. The output voltage

tracks the reference voltage and is capable of sourcing or sinking current up to

3A.



Block Diagram

GN D

VO U T

VI N

VC N TL

VR EF

Cu rre n t

Lim it

Th e rm a l

Lim it

V o lt age

Re g u la t io n

Sh u t d o w n