General Description

The MAX25254/MAX25255 are small, synchronous dual buck converters with integrated high-side and low-side switches. The ICs are designed to deliver up to 8A per channel with input voltages from 3V to 36V while using only 12μA quiescent current at no load. Voltage quality can be monitored by observing the PGOOD signals. The MAX25254/MAX25255 can regulate the output voltage in the dropout region by running at 99 of the duty cycle, making them ideal for automotive and industrial applications.

The MAX25254/MAX25255 offer two fixed output voltages of 5V and 3.3V. Four fixed frequency options allow for small external components and reduced output ripple, and also guarantee no AM interference. The MAX25254/MAX25255 can enter skip mode at light loads with ultra-low quiescent current of 12μA at no load. The MAX25254/MAX25255 can be ordered with spread spectrum enabled for optimum EMI performance.

Two buck converters within the MAX25254D and MAX25255D can be configured for dual-phase operation with up to 16A output load capability. Furthermore, the MAX25254D/MAX25255D and the MAX25254Q/MAX25255Q can be used in parallel to provide 4-phase operation that supports up to 32A (max) output current.

The MAX25254/MAX25255 are available in a small, 4.50mm x 5.75mm, 23-pin FC2QFN package and use very few external components.

Benefits and Features

Dual Buck Converter

•Wide Input Range from 3.0V to 36V (42V, max)

•Low Shutdown Supply Current (6.5μA, max)

•Low Operating Quiescent Current with OneChannel ON (12μA, typ)

•Programmable VOUT from 0.8V to 14V

•Up to 8A per Channel

•180° Out-of-Phase Operation between TwoConverters

•24ns (typ) Minimum On-Time

Dual/Quad Phase Operation

•Ability to Operate Two ICs in Parallel for Quad-PhaseOperation

•±10 Current Sharing Accuracy

•Supports up to 16A in Dual-Phase and 32A in Quad-Phase

Diagnostics and Redundant Circuits (MAX25255)

•ASIL B Compliant

•Redundant Reference

•Die Temperature Monitor

•Precision Overvoltage and Undervoltage Protection

General

•23-Pin, 4.50mm x 5.75mm FC2QFN Package

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

•AEC-Q100 Rating

•200kHz, 400kHz, 1MHz, or 2MHz SwitchingFrequency Options

•Spread Spectrum

Applications

•Front-End Power Supply for Head Units

•ASIL Applications

•General-Purpose Dual Buck Converters

•Telematics Modules

•Front Camera Power