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Maxim Integrated

Maxim Integrated MAX25431 Current-Mode Buck-Boost Power Controller IC

Automotive H-bridge buck-boost power controller offers best-in-class transient response

The Maxim Integrated MAX25431 is a current-mode buck-boost power controller IC for automotive applications which maintains a stable output voltage in the presence of transient voltages from the battery power supply.

In normal conditions, the MAX25431 operates from an input voltage ranging between 6V and 36V, producing an output which is fixed at 5V, or adjustable in a range from 4V to 25V. The controller is also able to withstand input transients of up to 40V.

The switching frequency is programmable via a resistor between 220kHz and 2.2MHz, and can be synchronized to an external clock. Support for high-frequency operation enables the use of small external passive components.

In light-load conditions, a logic input allows the MAX25431 to operate in fixed-frequency, forced PWM mode to eliminate frequency variation: this helps to minimize the need for EMI counter-measures and facilitates compliance with the requirements of the CISPR25 Class 5 standard.

Protection features integrated into the power controller include:

  • Cycle-by-cycle current limit followed by hiccup mode during sustained overloads
  • Input under-voltage lock-out
  • Output over-voltage protection
  • Thermal shut- down with automatic recovery

The MAX25431 is supplied in a 4mm x 4mm, 24-pin TQFN package.

MAX25431 Features

  • 10µA maximum quiescent current in shut-down mode
  • AEC-Q100 qualified
  • Operating-temperature range: -40°C to 125°C

MAX25431 Applications

  • Dedicated charging modules
  • Rear-seat entertainment modules
  • USB hubs, breakout boxes and multimedia hubs


Development Kit

Kit part number: MAX25431EVKIT#

The Maxim Integrated MAX25431 evaluation kit is a fully assembled and tested application circuit for the MAX25431 buck-boost controller IC. The quality of the output voltage can be monitored by observing the PGOOD signal.

Maxim Integrated MAX25431EVKIT