AP65352

Document number: DS38482 Rev. 2 - 3

1 of 15

www.diodes.com

December 2017

© Diodes Incorporated

AP65352

3A, 18V, 650kHz ADAPTIVE COT STEP-DOWN CONVERTER

Description

The AP65352 is an adaptive, constant on-time mode synchronous

buck converter providing high efficiency, excellent transient response

and high DC output accuracy for low-voltage regulation in digital

TVs and monitors.

The constant-on-time control scheme handles wide input/output

voltage ratios and provides low external component count. The

internal proprietary circuit enables the device to adopt both low

equivalent series resistance (ESR) output capacitors, such as

SP-CAP or POSCAP and ultra-low ESR ceramic capacitors.

The AP65352 also features programmable soft-start, UVLO, OTP,

OVP and OCP to protect the circuit.

AP65352 operates in continuous conduction mode (CCM) in light load

conditions for better EMI performance. AP65353 and AP65355 are

the options for light-load efficiency enhancement.

This IC is available in SO-8EP package.

Features



Fixed Frequency Emulated Constant On-Time Control



Good Stability Independent of the Output Capacitor ESR



Fast Load Transient Response



Synchronous Rectification: 90

mΩ Internal High-Side Switch and

57

mΩ Internal Low-Side Switch



Wide Input Voltage Range: 4.5V to 18V



Output Voltage Range: 0.76V to 6V



3A Continuous Output Current



650kHz Switching Frequency



Built-in Overcurrent Limit



Built-in Overvoltage Protection



Built-in Thermal Shutdown Protection



Programmable Soft-Start



Pre-Biased Start-Up



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



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

Pin Assignments

SW

VREG5

SS

EN

BST

PGND

VIN

( Top View )

1

2

3

4

8

7

6

5

FB

SO-8EP

Exposed

Pad

9

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.

NOT RECOMMENDED FOR NEW DESIGN

USE AP65353