36V, 2.5A/3.5A, Fully Integrated Synchronous

Silent Switcher Buck Converters

MAX26402/MAX26403

19-101815; Rev 0; 03/24

© 2024 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners.

General Description

The

MAX26402/MAX26403

ICs

are

tiny,

low-

electromagnetic

interference

(EMI)

emission,

synchronous Silent Switcher® buck converters with

integrated high-side and low-side switches. The

MAX26402/MAX26403 deliver up to 2.5A/3.5A over a

wide 3V to 36V input voltage range. Voltage quality can

be monitored by observing the power-good (PGOOD)

signal. These ICs can operate in dropout by running at

99% duty cycle, making them ideal for industrial

applications.

The

MAX26402/MAX26403

offer

externally

programmable or internally fixed output voltages of 5V

and 3.3V. Fixed internal frequency options of

3MHz/2.1MHz/400kHz are available, which allow for

small external components and reduced output ripple,

and also guarantee no amplitude modulation (AM)

interference.

When SYNC is low, the MAX26402/MAX26403

automatically enter skip mode at light loads with an ultra-

low quiescent current of 10μA at no load. A pin-

selectable, forced-pulse-width-modulation (PWM) mode

is also available, which helps improve EMI performance.

The devices have a spread-spectrum frequency

modulation option designed to minimize EMI-radiated

emissions due to the modulation frequency.

The devices feature the MAXQ® power architecture,

which provides precision transient performance and

phase margin. This allows obtaining the maximum

power, powerformance, and precision while minimizing

system cost for any specific application.

The MAX26402/MAX26403 are available in a small,

3mm x 3mm FC2QFN package and use very few

external components.

Applications

• Point-of-Load Power Supplies

• 12V/24V Industrial Applications

• Telecom, Servers, and Networking Equipment

Benefits and Features

• Silent Switcher

• Enables Compact, Efficient, Low-EMI Solution

• Spread-Spectrum Frequency Modulation

• Symmetrical Package Offers Superior EMI

Performance

• Multiple Functions for Small Size

• Operating Input Voltage Range: 3V to 36V

• Synchronous DC-DC Converter with Integrated

Field-Effect Transistors (FETs) up to 2.5A/3.5A

• 10μA Quiescent Current in Skip Mode

• 3MHz/2.1MHz/400kHz Switching Frequency

• Spread-Spectrum Option

• Fixed 2.5ms Internal Soft-Start

• Programmable 0.8V to 12V Output Voltage

Range or Fixed 5V/3.3V Options Available

• 99% Duty Cycle Operation with Low Dropout

• High Precision for Safety Critical Applications

• MAXQ Power Architecture

• ±1.5% Output Voltage Accuracy in Forced-PWM

• Precision Enable Thresholds for Fully

Programmable Undervoltage Lockout (UVLO)

Thresholds

• Accurate Windowed PGOOD

• Robust for the Environment

• Average Current-Mode, Forced-PWM, and Skip

Operation

• Overtemperature, Overvoltage (OV), and Short-

Circuit Protection

• 3mm x 3mm FC2QFN

• -40°C to +125°C Operating Temperature Range

Ordering Information appears at end of data sheet.

Silent Switcher is a registered trademark of Analog Devices, Inc.

MAXQ is a registered trademark of Analog Devices, Inc.