AP1513

Document number: DS31053 Rev. 5 - 2

1 of 9

www.diodes.com

December 2017

© Diodes Incorporated

AP1513

PWM CONTROL 2A STEP-DOWN CONVERTER

Description

AP1513 consists of step-down switching regulator with PWM control.

These devices include a reference voltage source, oscillation circuit,

error amplifier, and internal PMOS.

AP1513 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 100%. 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 30kHz. Also, an internal compensation block is built in to

minimum 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 SO-8 mini-package,

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.

Features



Input Voltage: 3.6V to 18V



Output Voltage: 0.8V to VCC



Duty Ratio: 0% to 100% PWM Control



Oscillation Frequency: 300kHz Typ



Soft-start, Current Limit, Enable Function



Thermal Shutdown Function



Built-in Internal SW P-channel MOS



Totally Lead-Free & Fully RoHS Compliant (Notes 1 & 2)



Halogen and Antimony Free.“Green” Device (Note 3)

Pin Assignments

(Top View)

1

2

3

4

8

7

6

5

FB

Output

OCSET

AP1513

Output

EN

VSS

VSS

VCC

SO-8

Applications



PC Motherboard



LCD Monitor



Graphic Card



DVD-Video Player



Telecom Equipment



ADSL Modem



Printer and Other Peripheral Equipment



Microprocessor Core Supply



Networking Power Supply

Notes:

1.

No purposely added lead. Fully EU Directive 2002/95/EC (RoHS) & 2011/65/EU (RoHS 2) compliant.

2.

See http://www.diodes.com/quality/lead_free.html for more information about Diodes Incorporated’s definitions of Halogen- and Antimony-free,"Green"

and Lead-free.

3.

Halogen- and Antimony-free "Gr

een” products are defined as those which contain <900ppm bromine, <900ppm chlorine (<1500ppm total Br + Cl) and

<1000ppm antimony compounds.

Typical Applications Circuit

AP1513

+

-

V

SS

EN

C

C

R

A

R

B

D1

SBR2U30P1

FB

Vcc

Output

CVcc

V

OUT= 5V/2A

V

IN

R

OCSET

OCSET

C

OUT

C

IN

Optional

C

OCSET

C

EN

R

EN

Option

100K

L1

33µH

6.8K

1.3K

3K

0.1µF

+

-

C

0.1µF

470µF

470µF

0.1µF

VIN = 12V, IMAX = 2A

VOUT

2.5V

3.3V

5V

L1 Value

22µH

27µH

33µH

Note: VOUT=VFB x (1+RA/RB)

RB=0.7kΩ to 5kΩ