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AP3440

Document number: DS36691 Rev. 2 - 2

1 of 15

www.diodes.com

March 2014

AP3440

A Product Line of

Diodes Incorporated

NEW PRODUC T

4A, 2MHZ HIGH PERFORMANCE SYNCHRONOUS BUCK CONVERTER

Description

The AP3440 is a current mode, PWM synchronous buck (step-down)

DC-DC converter, capable of driving a 4A load with high efficiency,

excellent line and load regulation.

The device integrates two N-channel power MOSFETs with low on-

resistance. Current mode control provides fast transient response and

cycle-by-cycle current limit.

The switching frequency of AP3440 can be programmable from

200kHz to 2MHz, which allows small-sized components, such as

capacitors and inductors. A standard series of inductors from several

different manufacturers are available. This feature greatly simplifies

the design of switch-mode power supplies.

Under voltage lockout is internally set at 2.6V, but can be increased

by programming the threshold with a resistor network on the enable

pin. The output voltage startup ramp is controlled by the soft-start pin.

An open drain power good signal indicates the output is within 93% to

107% of its nominal voltage.

The AP3440 is available in U-QFN3030-16 package.

Applications

 Low-voltage, High-density Power Systems

 Point of Load Regulation for High Performance DSPs, FPGAs,

ASICs and Microprocessors

 Broadband, Networking and Optical Communications

Infrastructure

Pin Assignments

(Top View)

VIN

GND

AGND

COMP

RT/CLK

BOOT

PGD

VIN

E P

5 6 7 8

4 9

Pin 1 Mark

13141516

U-QFN3030-16

Features

 Input Voltage Range: 2.95V to 5.5V

 0.8V Reference Voltage with ±3% Precision

 Two 30m(Typical) MOSFETs for High Efficiency at 4A Load

 High Efficiency: Up to 94%

 Output Current: 4A

 Programmable Frequency:200kHz to 2MHz

 Current Mode Control

 Synchronizes to External Clock

 Adjustable Soft-start

 Soft Start-up into Pre-biased Output

 UV and OV Power Good Output

 Built-in Over Current Protection

 Built-in Thermal Shutdown Function

 Programmable UVLO Function

 Built-in Over Voltage Protection

 Thermally Enhanced 3mm×3mm 16-pin U-QFN3030-16

 Totally Lead-free & Fully RoHS Compliant (Note1 & 2)

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

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.

1 2 3 4 5 6 ... 14 15

Inhaltsverzeichnis

Seite 1 - Pin 1 Mark

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Seite 3

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Seite 4

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Seite 5

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Seite 6 - Switching Frequency (kHz)

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Seite 7

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Seite 8

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Seite 9

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Seite 10 - Diodes Incorporated

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Seite 11

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Seite 12 - COMPEAOUT

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Seite 13 -

AP3440 Document number: DS36691 Rev. 2 - 2 7 of 15 www.diodes.com March 2014 © Diodes Incorporated AP3440 A Product Line of Diodes Incorporated

Seite 14 - Bottom View

AP3440 Document number: DS36691 Rev. 2 - 2 8 of 15 www.diodes.com March 2014 © Diodes Incorporated AP3440 A Product Line of Diodes Incorporated

Seite 15 - NEW P RODUC T

AP3440 Document number: DS36691 Rev. 2 - 2 9 of 15 www.diodes.com March 2014 © Diodes Incorporated AP3440 A Product Line of Diodes Incorporated

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