AP3598A

Document number: DS37261 Rev. 2 - 2

1 of 28

www.diodes.com

November 2014

© Diodes Incorporated

AP3598A

A Product Line of

Diodes Incorporated

COMPACT DUAL-PHASE SYNCHRONOUS-RECTIFIED BUCK CONTROLLER

Description

The AP3598A is a dual-phase synchronous buck PWM controller with

integrated drivers which are optimized for high performance graphic

card and computer applications. The IC is capable of delivering up to

60A output current capability, supporting 12V MOSFET drivers with

internal bootstrap diodes.

The dynamic output voltage could be implemented by analog method

with a switching device and a resistor network. The adjustable current

The AP3598A provides over current protection, input/output under

voltage protection, over voltage protection and over temperature

protection.

Other features include adjustable soft start, adjustable operation

frequency and so on. With aforementioned functions, the IC adopts U-

QFN4040-24 package.

Features



Operate with Single Supply Voltage



Reference Voltage Output with 1% Accuracy



Simple Single Loop Voltage Mode Control



12V Bootstrapped Drivers with Internal Boot-strap Diodes





Phase



External Compensation



Dynamic Output Voltage Adjustment



Adjustable Soft Start



Built-in UV and OV Protection Function



Built-in Over Current Protection



Built-in Thermal Shutdown Function



U-QFN4040-24 Package



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



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

Pin Assignments

(Top View)

U-QFN4040-24

Applications



Middle-High End Graphic Card



Generic Desktop and Consumer 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.

REFADJ

VID

PSI

EN

HGATE1

BOOT1

BOOT2

HGATE2

PGOOD

VCC

TALERT#

TSNS

Pin 1 Mark

THERM/

GND

1

10

2

3

4

5

6

7

8

9

11 12

13

14

15

16

17

18

19

20

21

22

23

24

25