Diodes AP131 User Manual

AP131

300mA LOW DROPOUT LINEAR REGULATOR WITH

SHUTDOWN

Features

• Input Voltage Range is from 2.7 to 5.5V

• Dropout Voltage 400mV at 300mA Output Current

• Guaranteed 300mA Output Current

• Internal Ron = 1.5Ω PMOS draws no Base Current

• Low Quiescent Current 50µA

• Output Voltage: 1.5V/1.8V/2.0V/2.5V/2.8V/

• 2.9V/3.0V/3.3V/ 3.5V; Accuracy 2%

• Active Low Shutdown Function (EN pin)

• Fast Transient Response

• Good Load Regulation

• Current Limit and Thermal Shutdown Protection

• Short Circuit Current Fold-Back

• Lead Free package: SOT25

• SOT25: Available in “Green” Molding Compound

(No Br, Sb)

• Lead Free Finish/RoHS Compliant (Note 1)

Applications

• Battery Powered Device

• Wireless Communication

• CD-ROM, DVD, and LAN Card

• PC Peripheral

Ordering Information

AP131 - XX W X - 7

General Description

The AP131 is a 300mA, fixed output voltage, low dr opout linear
regulator. The Device included pass element, error amplifier,
band-gap, current limit and thermal shutdown circuitry. The
device is ON when the EN pin is set to logic high level.

The characteristics of low dropout voltage and less quiescent
current make it good for some critical current applications, for
example, some battery powered devices. The typical quiescent
current is approximately 50µA from zero to maximum load. Due
to the internal flexible design, it results in extensively fixed output
voltage versions and makes it convenient to use for applications.
Built-in current-limit and thermal-shutdown functions prevent any
fault condition from IC damage. An external capacitor can be
connected to the BP pin and reduce the output noise.

Output Voltage

15 :1.5V
18 :1.8V

Package Packing

W : SOT25

Lead Free

L : Lead Free

G : Green

7 : Tape & Reel

20 :2.0V
25 :2.5V

28 :2.8V
29 :2.9V
30 :3.0V
33 :3.3V
35 :3.5V

Device

AP131-XXWL-7

Lead-free

AP131-XXWG-7

Notes: 1. EU Directive 2002/95/EC (RoHS). All applicable RoHS exemptions applied. Please visit our website at
http://www.diodes.com/products/lead_free.html

2. Pad layout as shown on Diodes Inc. suggested pad layout document AP02001, which can be found on our website at

http://www.diodes.com/datasheets/ap02001.pdf

Package

Code

W SOT25
W SOT25

Packaging

(Note 2)

.

.

Quantity Part Number Suffix

3000/Tape & Reel -7
3000/Tape & Reel -7

7” Tape and Reel

AP131 Rev. 7 1 of 7 FEBRUARY 2009

www.diodes.com © Diodes Incorporated

Pin Assignment

AP131

300mA LOW DROPOUT LINEAR REGULATOR WITH

SHUTDOWN

( Top View )

Pin Description

Pin Name Description

IN Input Voltage

GND Ground

EN Enable Pin
BP Band-gap

OUT Output Voltage

Block Diagram

1IN

OUT

5
2
3

EN BP

4

SOT25

IN

EN

Current

Limit

Enable

-

+

Bandgap

Error

Amp

1.08V

OUT

Thermal

Shutdown

BP

AP131 Rev. 7 2 of 7 FEBRUARY 2009

www.diodes.com © Diodes Incorporated

GND

AP131

300mA LOW DROPOUT LINEAR REGULATOR WITH

SHUTDOWN

Absolute Maximum Ratings

Symbol Parameter Rating Unit

VCC Input Voltage +6 V

TOP Operating Junction Temperature Range -40 to +125 ºC
TST Storage Temperature Range -65 to +150 ºC

PD Power Dissipation, PD @ TA = 25ºC SOT25 250 mW

Recommended Operating Conditions

Symbol Parameter Min Max Unit

V

IN

I

OUT

T

A

AP131 Rev. 7 3 of 7 FEBRUARY 2009

Input Voltage 2.7 5.5 V
Output Current 0 300 mA
Operating Ambient Temperature -40 85

www.diodes.com © Diodes Incorporated

°C