www.diodes.com

Announcement

New Product

diodes.com

June 2025

The AP61402Q is an automotive-compliant,

4A, synchronous buck converter with a wide

input voltage range of 2.3V to 5.5V. It fully

integrates a 75mΩ high-side power

MOSFET and a 33mΩ low-side power

MOSFET to provide high-efficiency step-

down DC-DC conversion.

The device minimizes the external

component count through its adoption of

constant on-time (COT) control to achieve

fast transient response, easy loop

stabilization, and low output voltage ripple.

The AP61402Q features a small form factor

and utilizes a 2MHz switching frequency,

which enables the use of smaller, cheaper

inductors.

Its proprietary gate driver resists switching-

node ringing without sacrificing MOSFET

turn-on and turn-off times. This reduces

high-frequency radiated EMI noise caused

by MOSFET switching.

The device is available in a

V-DFN1515-6/SWP (Type UX) package.

A standard-compliance version, AP61402, is

available and suitable for industrial and

commercial applications.

Automotive-compliant - AEC qualified, manufactured in

sites certified to IATF 16949 supporting PPAP

documents.

The Diodes logo is a registered trademark of Diodes

Incorporated in the United States and other countries.

All other trademarks are the property of their respective

owners.

© 2025 Copyright Diodes Incorporated. All Rights

Reserved.

5.5V, 4A, Low IQ, Automotive-Compliant, Synchronous

Buck Converters in the Tiny V-DFN1515-6/SWP (Type UX)

Applications

Automotive 5V and 3.3V Point of Load in:

▪ Infotainment

▪ Instrument clusters

▪ Telematics

▪ Advanced driver assistance

systems (ADAS)

The DIODES Advantage

The AP61402Q provides a high-efficiency, small footprint,

DC-DC buck converter solution for automotive point-of-

load (POL).

▪ High Operating Frequency of 2MHz

Reduces external LC size & outside MW frequency band,

easing EMI

▪ 4A Maximum Output Current in the Tiny Wettable

DFN1515-6

Provides high power density for high ambient temperatures in

automotive POL applications

▪ Wide 2.3V to 5.5V Input Voltage with LDO Mode

Operates from 5V, 3.3V and core-voltage-to-core-voltage

POL applications with brown-out support

▪ Multi-Function EN Controls PFM/PWM Mode of Operation

Provides flexibility for low Iq high-light-load efficiency or equal

ripple across load conditions in fixed PWM

▪ Both High-Side and Low-Side Current Sense Protection

Increases robustness in automotive POL applications

AP61402Q