AP1534

PWM CONTROL 2A STEP-DOWN CONVERTER

AP1534 Rev. 2

1 of 8

DECEMBER 2007

www.diodes.com

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Input voltage: 4.4V to 18V

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Duty ratio: 0% to 99% PWM control

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Oscillation frequency: 300KHz typ.

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Current limit, Enable function

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Thermal Shutdown function

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Built-in internal SW P-channel MOS

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SOP-8L: Available in “Green” Molding Compound

(no Br, Sb)

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Lead Free Finish/RoHS Compliant (Note 1)

AP1534 consists of step-down switching regulator with PWM

control. These devices include a reference voltage source,

oscillation circuit, error amplifier, internal PMOS.

AP1534 provides low-ripple power, high efficiency, and excellent

transient characteristics. The PWM control circuit is able to vary

the duty ratio linearly from 0 up to 99%.

This converter also

contains an error amplifier circuit as well as a soft-start circuit that

prevents overshoot at startup.

An enable function, an over

current protect function and a short circuit protect function are built

inside, and when OCP or SCP happens, the operation frequency

will be reduced from 300KHz to 50KHz. Also, an internal

compensation block is built in to minimize external component

count.

With the addition of an internal P-channel Power MOS, a coil,

capacitors, and a diode connected externally, these ICs can

function as step-down switching regulators. They serve as ideal

power supply units for portable devices when coupled with the

SOP-8L mini-packages, providing such outstanding features as

low current consumption. Since this converter can accommodate

an input voltage up to 18V, it is also suitable for the operation via

an AC adapter.

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PC Motherboard

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LCD Monitor

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Graphic Card

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DVD-Video Player

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Telecom Equipment

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ADSL Modem

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Printer and other Peripheral Equipment

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Microprocessor Core Supply

A P 1 5 3 4 X X X

Package

Packing

S : SOP-8L

Lead Free

-U : Tube

-13 : Tape & Reel

G : Green

Note:

1. RoHS revision 13.2.2003. Glass and High Temperature Solder Exemptions Applied, see EU Directive Annex Notes 5 and 7.

Tube

13” Tape and Reel

Device

Package

Code

Packaging

(Note 2)

Quantity

Part Number

Suffix

Quantity

Part Number

Suffix

AP1534S

S

SOP-8L

100

-U

2500/Tape & Reel

-13

Note:

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

Features

General Description

Applications

Ordering Information