Analog Devices MAX25203 automotive boost controller

Analog Devices introduces an efficient, multiphase synchronous boost controller that regulates high-power Class-D amplifiers in automotive infotainment systems. The MAX25203 features both programmable gate drive voltage and current limit blanking time, as well as current balancing, and operates at a high switching frequency designed to reduce the bill of materials cost and shrink PCB space by 36%.

The controller starts with a battery input voltage from 4.5 to 42 V and operates down to 1.8 V after start-up. It sustains an absolute maximum output voltage of up to 70 V and features a low shutdown supply current of 5 µA. Useful for generating backlight and Class-D audio amplifier voltages, the product offers I²C bus diagnostics including die temperature, phase current monitoring and optional true shutdown. Output voltage is scalable via the PWM input or I²C interface and a sync-out feature supports additional phases for higher power systems.

Factory-programmable gate drive voltage from 5.5 to 10 V increases power density by reducing MOSFET Rdson loss for higher efficiency. Programmable current limit blanking time supports short peak current events without power supply overdesign. The resistor-programmable switching frequency up to 2.1 MHz is designed to improve EMI and reduce external components’ size and count, while the ±5% current share accuracy from phase to phase reduces inductor size.