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Maxim Integrated

Maxim Integrated MAX25431 Automotive H-Bridge Buck-Boost Controller

Featuring Best in Class Transient Response

The Maxim Integrated MAX25431 is a current-mode buck-boost controller with best-in-class transient response. Operating with input voltages from 6V to 36V, the controller’s switching frequency is resistor programmable from 220kHz to 2.2MHz. The MAX25431 can be synchronized to an external clock.

The Maxim Integrated MAX25431 buck-boost controller’s output voltage is available as 5V fixed or adjustable from 4V to 25V. The wide input voltage range, along with the controller’s ability to maintain constant output voltage during battery transients, makes the MAX25431 ideal for automotive applications. In light load applications, a logic input (FSYNC) allows the devices to operate in fixed-frequency, forced-PWM mode to eliminate frequency variation and help minimize EMI.


Protection Features

The MAX25431 protection features include cycle-by-cycle current limit followed by hiccup during sustained overloads, input under-voltage lockout (UVLO), out- put overvoltage protection and thermal shut- down with automatic recovery.

Package Size

The MAX25431 is available in a small 4mm x 4mm 24-pin TQFN-EP SW package.

MAX25431 Features

  • Meets Stringent Automotive Quality and Reliability Requirements (AEC-Q100 Qualified)
  • Efficient Solution in a Small Solutions Size (4mm x 4mm 24-Pin SWTQFN Package)
  • Low Quiescent Current Helps Designers Meet Stringent OEM Current Requirements
  • EMI Mitigation to meet CISPR25 Class 5 Requirements

MAX25431 Applications

  • Dedicated Charging Modules
  • Rear-Seat Entertainment Modules
  • USB Hubs, Breakout Boxes and Multimedia Hubs


Maxim Integrated MAX25431