Boost controller reduces audio amplifier size

Boost controller reduces audio amplifier size

New Products |
By Peter Clarke

The MAX25203 features both programmable gate drive voltage and current limit blanking time, as well as accurate current balancing. By operating at a 2.1MHz frequency it helps reduce the bill of materials cost and shrink PCB space by 36 percent.

The MAX25203 controller starts with a battery input voltage from 4.5V to 42V and operates down to 1.8V after start-up. It sustains an absolute maximum output voltage of up to 70V and features a low shutdown supply current of 5µA. Useful to generate backlight and Class-D audio amplifier voltages, the MAX25203 offers I2C bus diagnostics including die temperature, phase current monitoring and optional true shutdown to improve system reliability. 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 5.5V to 10V increases power density by reducing MOSFET Rds(on) loss for higher efficiency and lower cost.

Programmable current limit blanking time supports short peak current events without power supply overdesign for lower solution cost. Resistor programmable switching frequency up to 2.1MHz improves EMI and reduces external components’ size and count.

The MAX25203 is available as of now in a 32-Lead TQFN-CU packaging together with an evalutation board.

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