AP65355

Document number: DS37875 Rev. 2 - 2

1 of 15

www.diodes.com

May 2017

© Diodes Incorporated

AP65355

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

Description

The AP65355 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

TV and monitor.

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 adaptive on-time control supports seamless transition between

continuous conduction mode (CCM) at higher load conditions and

discontinuous conduction mode (DCM) at lighter load conditions.

DCM allows AP65355 to maintain high efficiency at light load

conditions. The AP65355 also features power good, programmable

soft-start, UVLO, OTP, OVP and OCP to protect the circuit.

This IC is available in U-DFN3030-10 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



Power Good Indicator



3A Continuous Output Current



650kHz Switching Frequency



Built-in Over Current Limit



Built-in Over Voltage 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

Applications



Gaming Consoles



Flat Screen TV Sets and Monitors



Set-Top Boxes



Home Audio



Consumer Electronics



Network Systems



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.

EN

PG

FB

VREG5

SS

SW

SW

BST

VIN

VIN

1

2

3

4

5

6

7

8

9

10

Exposed

Pad

11

PGND

( Top View )

U-DFN3030-10