Diodes AP1513 User Manual

V

V

AP1513

PWM CONTROL 2A STEP-DOWN CONVERTER

Features

• Input voltage: 3.6V to 18V

• Output voltage: 0.8V to V

• 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

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

(No Br, Sb)

• Lead Free Finish/ RoHS Compliant (Note 1)

CC

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

Typical Application Circuit

V

IN

R

C

OCSET

OCSET

Option

R

EN

100K

C

EN

0.1uF

C

IN

470uF

3K

CVcc

0.1uF

Vcc

OCSET

EN

AP1513

General 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
SOP–8L 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.

V

C

0.1uF

OUT

+

-

= 5V/2A

C

OUT

470uF

Output

FB

V

SS

L1

33uH

C

C

Optional

D1

SBR2U30P1

R

A

6.8K

R

B

1.3K

+

-

Note: V
R

OUT

L1 Value

22uH 27uH 33uH

= VFB x (1+RA/RB)

OUT

=0.7K~5K ohm

B

=12V, I

IN

=2A

MAX

2.5V 3.3V 5V

AP1513 Rev. 4 1 of 9 JULY 2009
DS31053 www.diodes.com © Diodes Incorporated

Ordering Information

PWM CONTROL 2A STEP-DOWN CONVERTER

AP1513 S X - 13

AP1513

Package Packing

Device

AP1513SL-13 S SOP-8L 2500/Tape & Reel -13

Lead-free

AP1513SG-13 S SOP-8L 2500/Tape & Reel -13

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

Packaging

(Note 2)

Lead Free

L : Lead Free

G : Green

13 : Tape & ReelS : SOP-8L

13” Tape and Reel

Quantity Part Number Suffix

Pin Descriptions

FB

EN

OCSET

V

CC

( Top View )

1

2

AP1513

3

4

8

7

6

5

Vss

Vss

Output

Output

SOP-8L

Pin Descriptions

Pin Name

Pin No.

FB 1 Feedback pin

Power-off pin
H: Normal operation

EN 2

(Step-down operation)
L: Step-down operation stopped
(All circuits deactivated)

OCSET 3 Add an external resistor to set max output current

VCC 4 IC power supply pin

Output 5, 6

Switch Pin. Connect external inductor/diode here. Minimize trace area at this pin
to reduce EMI

VSS 7, 8 GND Pin

AP1513 Rev. 4 2 of 9 JULY 2009
DS31053 www.diodes.com © Diodes Incorporated

Description

Block Diagram

AP1513

PWM CONTROL 2A STEP-DOWN CONVERTER

Output

Oscillation

Circuit

Reference Voltage Source

Vcc

PWM-Switched
Control Circuit

+

FB

-

Thermal

Shutdown

EN

EN

100uA

OCSET

VssV

Absolute Maximum Ratings

Symbol Parameter Rating Unit

V

VCC Pin Voltage V

CC

V

Feedback Pin Voltage V

FB

V

EN Pin Voltage V

EN

V

Switch Pin Voltage VSS - 0.3 to VIN + 0.3 V

OUT

P

Power Dissipation Internally limited mW

D

T

Operating Junction Temperature Range -40 to +125

J

T

Storage Temperature Range -40 to +150

ST

Caution: The absolute maximum ratings are rated values exceeding which the product could suffer physical damage. These values must therefore not be

exceeded under any conditions.

- 0.3 to VSS + 20 V

SS

- 0.3 to VCC V

SS

- 0.3 to VIN + 0.3 V

SS

o

C

o

C

Recommended Operating Conditions

Symbol Parameter Min Max Unit

VIN Input Voltage 3.6 18 V

I

Output Current 0 2 A

OUT

TA Operating Ambient Temperature -20 85

o

C

AP1513 Rev. 4 3 of 9 JULY 2009
DS31053 www.diodes.com © Diodes Incorporated