AP6503

Document number: DS35077 Rev. 7 - 2

1 of 16

www.diodes.com

May 2017

© Diodes Incorporated

AP6503

340kHz 23V 3A SYNCHRONOUS DC/DC BUCK CONVERTER

Description

The AP6503 is a 340kHz switching frequency external compensated

and low side MOSFETs.

The AP6503 enables continuous load current of up to 3A with

efficiency as high as 95%.

The AP6503 features current mode control operation, which enables

fast transient response times and easy loop stabilization.

The AP6503 simplifies board layout and reduces space requirements

with its high level of integration and minimal need for external

components, making it ideal for distributed power architectures.

The AP6503 is available in a standard Green SO-8EP package with

exposed PAD for improved thermal performance and is RoHS

compliant.

Features





3A Continuous Output Current at 12Vin and 3.3Vout, 5.5A Peak





340kHz Switching Frequency



Programmable Soft-Start



Enable Pin



Protection



OCP



Thermal Shutdown



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



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

Pin Assignments

COMP

SW

GND

BST

EN

FB

SS

( Top View )

1

2

3

4

8

7

6

5

IN

SO-8EP

Applications



Gaming Consoles



Flat Screen TV Sets and Monitors



Set Top Boxes



Distributed Power Systems



Home Audio



Consumer Electronics



Network Systems



FPGA, DSP and ASIC Supplies



Green Electronics

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

<1000ppm antimony compounds.

Typical Applications Circuit

AP6503

L1

10µH

R1

26.1k

Ω

R2

10k

Ω

C5

10nF

C2

47μF

C1

22μF

C4

0.1μF

ON

OFF

2

IN

8

SS

7

EN

6

COMP

3

SW

1

BST

5

FB

C3

6.8nF

R3

6.8k

Ω

4

GND

INPUT

OUTPUT

3.3V

Figure 1 Typical Application Circuit

LOAD CURRENT (A)

Efficiency vs. Load Current

E

F

F

I

C

I

E

N

C

Y

(

%

)

0

1

2

3

V

= 12V

IN

V

= 5V

IN

V

= 3.3V

L = 10µH

OUT

40

50

60

70

80

90

100