Automotive 40V, 2.2MHz, H-Bridge Buck-Boost Controller

The MAX25431 is a current-mode buck-boost controller. The device operates with input voltages from 6V to 36V. The switching frequency is resistor programmable from 220kHz to 2.2MHz and can be synchronized to an external clock..

The device output voltage is available as 5V fixed or adjustable from 4V to 25V. The wide input voltage range, along with its ability to maintain constant output voltage during battery transients, makes the device 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 variaion and help minimize EMI. 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.

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

Applications

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

* Meets Stringent Automotive Quality and Reliability Requirements

* Operating VIN Range: 2V to 36V Allows Operation in Cold-Crank Conditions

* Tolerates Input Transients to 40V

* EN Pin Compatible from +3.3V to +40V

* -40°C to +125°C Automotive Temperature Range

* AEC-Q100 Qualified

* Efficient Solution in a Small Solutions Size

* Fixed 5V Output Voltage and Adjustable 3V to 25V

* High Switching Frequency Allows Use of Small External Components

* Small 4mm x 4mm 24-Pin SWTQFN Package

* Low Quiescent Current Helps Designers Meet Stringent OEM Current Requirements

* 10µA (max) Quiescent Current in Shutdown

* EMI Mitigation to meet CISPR25 Class 5 Requirements

* 220kHz to 2.2MHz Operating Frequency

* Fixed-Frequency PWM Mode

* External Frequency Synchronization or SYNC OUT Capability