Diodes AP1530 User Manual

AP1530

18V 3A 300KHz BUCK 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.

• Current Limit, Enable function

• Thermal Shutdown function

• Built-in internal SW P-channel MOS

• Lead Free package: SOP-8L

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

(No Br, Sb) (Note 1)

• Lead Free Finish/ RoHS Compliant (Note 2)

CC

.

Applications

• PCD 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

OCSET

3K

C

IN

470uF

CVcc

0.1uF

R

100K

C

0.1uF

C

OCSET

Option

EN

Vcc

OCSET

AP 1530

EN

General Description

AP1530 consists of step-down switching regulator with PWM control. These devices include a reference voltage source, oscillation circuit, error amplifier and internal PMOS.

AP1530 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. An enable function, an over current protection and a short circuit protection 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 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 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

= 5V/3A

Output

FB

V

SS

L1

22uH

Cc

Option

D1*

R

A

6.8K

R

B

1.3K

OUT

+

C

0.1uF 470uF

-

C

OUT

V

OUT

* Suggested DIODES Power Schottky P/N: B340 series or PDS340.

x (

V

FB

=

= 0.7K~5K ohm

R

B

1+

R

/R

)

B

A

AP1530 Rev. 7 1 of 12 NOVEMBER 2009 DS31092 www.diodes.com © Diodes Incorporated

Ordering Information

AP1530

18V 3A 300KHz BUCK CONVERTER

AP 1 5 3 0 S X - 13

Package Packing

S : SOP-8L

Device

AP1530SL-13 S SOP-8L 2500/Tape & Reel -13 AP1530SG-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

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.

http://www.diodes.com/products/lead_free.html.

Package

Code

Packaging

(Note 2)

Lead Free

L : Lead Free

G : Green

13 : Tape & Reel

13” Tape and Reel

Quantity Part Number Suffix

Pin Assignments

(1) SOP-8L

( Top View )

FB

EN

1

2

Vss

8

Vss

7

OCSET

AP1530 Rev. 7 2 of 12 NOVEMBER 2009 DS31092 www.diodes.com © Diodes Incorporated

3

4

V

CC

6

5

Output

18V 3A 300KHz BUCK CONVERTER

Pin Descriptions

Pin Name Pin No. Description

FB 1 Feedback pin

Power-off pin H: Normal operation

EN 2

OCSET 3 Add an external resistor to set max output current

VCC 4 IC power supply pin

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

AP1530

Output 5, 6

VSS 7, 8 GND Pin

Block Diagram

Vcc

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

Output

Oscillation

Circuit

PWM-Switched Control Circuit

Thermal

Shutdown

EN

Reference Voltage Source

+

-

100uA

OCSET

FB

VssV

AP1530

18V 3A 300KHz BUCK CONVERTER

Absolute Maximum Ratings

Symbol Parameter Rating Unit

ESD HBM Human Body Model ESD Protection 5 KV

ESD MM Machine Model ESD Protection 500 V

VCC VCC Pin Voltage VSS - 0.3 to VSS + 20 V VFB Feedback Pin Voltage VSS - 0.3 to VCC V VEN EN Pin Voltage VSS - 0.3 to VIN + 0.3 V

V

Switch Pin Voltage VSS - 0.3 to VIN + 0.3 V

OUTPUT

PD Power Dissipation Internally limited mW

TJ Operating Junction Temperature Range -40 to +125

T

Storage Temperature Range -65 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.

Recommended Operating Conditions

Symbol Parameter Min Max Unit

VIN Input Voltage 3.6 18 V I

Output Current 0 3 A

OUT

TA Operating Ambient Temperature -20 85

o

C

o

C

o

C