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AP65550

Document number: DS36336 Rev. 2 - 2

1 of 14

www.diodes.com

April 2014

AP65550

5A, 18V, 650kHz ADAPTIVE COT STEP-DOWN CONVERTER

Description

The AP65550 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 AP65550 maintain high efficiency at light load conditions.

The AP65550 also features programmable soft-start, UVLO, OTP and

OCP to protect the circuit.

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: 65mΩ Internal High-side Switch and

36mΩ Internal Low-side Switch

 Wide Input Voltage Range: 4.5V to 18V

 Output Voltage Range: 0.76V to 6V

 5A Continuous Output Current

 650kHz Switching Frequency

 Built-in Over Current Limit

 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

VREG5

GND

VIN

( Top View )

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

AP65550

1.5μH

8.25kΩ

22.1kΩ

0.1µF

44μF

20μF

8.2nF

OFF

VREG5

BST

1µF

GND

INPUT

OUTPUT

OUT

1.05V

12V

Figure 1. Typical Application Circuit

1 2 3 4 5 6 ... 13 14

Indice de contenidos

Pagina 1 - AP65550

AP65550 Document number: DS36336 Rev. 2 - 2 1 of 14 www.diodes.com April 2014 © Diodes Incorporated AP65550 5A, 18V, 650kHz ADAPTIVE COT STEP-DOWN

Pagina 2 - Pin Descriptions

AP65550 Document number: DS36336 Rev. 2 - 2 10 of 14 www.diodes.com April 2014 © Diodes Incorporated AP65550 Application Information (cont.) Sof

Pagina 3

AP65550 Document number: DS36336 Rev. 2 - 2 11 of 14 www.diodes.com April 2014 © Diodes Incorporated AP65550 Application Information (cont.) Ind

Pagina 4

AP65550 Document number: DS36336 Rev. 2 - 2 12 of 14 www.diodes.com April 2014 © Diodes Incorporated AP65550 Application Information (cont.) Out

Pagina 5

AP65550 Document number: DS36336 Rev. 2 - 2 13 of 14 www.diodes.com April 2014 © Diodes Incorporated AP65550 Ordering Information AP65550 XX -

Pagina 6

AP65550 Document number: DS36336 Rev. 2 - 2 14 of 14 www.diodes.com April 2014 © Diodes Incorporated AP65550 Suggested Pad Layout Please see AP02

Pagina 7

AP65550 Document number: DS36336 Rev. 2 - 2 2 of 14 www.diodes.com April 2014 © Diodes Incorporated AP65550 Pin Descriptions Pin Name Pin Num

Pagina 8

AP65550 Document number: DS36336 Rev. 2 - 2 3 of 14 www.diodes.com April 2014 © Diodes Incorporated AP65550 Absolute Maximum Ratings (Note 4) (@

Pagina 9

AP65550 Document number: DS36336 Rev. 2 - 2 4 of 14 www.diodes.com April 2014 © Diodes Incorporated AP65550 Electrical Characteristics (@TA = +2

AP65550 Document number: DS36336 Rev. 2 - 2 5 of 14 www.diodes.com April 2014 © Diodes Incorporated AP65550 Typical Performance Characteristics

Pagina 11 - Output Capacitor

AP65550 Document number: DS36336 Rev. 2 - 2 6 of 14 www.diodes.com April 2014 © Diodes Incorporated AP65550 Typical Performance Characteristics

Pagina 12 - ESR*ΔIVout

AP65550 Document number: DS36336 Rev. 2 - 2 7 of 14 www.diodes.com April 2014 © Diodes Incorporated AP65550 Typical Performance Characteristics

Pagina 13 - ( Top View )

AP65550 Document number: DS36336 Rev. 2 - 2 8 of 14 www.diodes.com April 2014 © Diodes Incorporated AP65550 Typical Performance Characteristics

Pagina 14 - Suggested Pad Layout

AP65550 Document number: DS36336 Rev. 2 - 2 9 of 14 www.diodes.com April 2014 © Diodes Incorporated AP65550 Application Information ENFBVREG5SSEP

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