Analog Devices automotive boost controller shrinks Class-D audio amplifier space by 36%

Article By : Analog Devices Inc.

Analog Devices' multi-phase synchronous boost controller regulates high-power Class-D amplifiers in automotive infotainment systems.

Analog Devices Inc. (ADI) has launched a highly efficient multi-phase 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 accurate current balancing, and operates at a high switching frequency to reduce the bill of materials cost and shrink PCB space by 36 percent. The MAX25203 joins ADI’s family of automotive boost controllers that include the MAX25201 and MAX25202 single/dual boost controllers, both designed for lower power applications.

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.

Key features include factory programmable gate drive voltage from 5.5V to 10V, which increases power density by reducing MOSFET Rdson loss for higher efficiency and lower cost; programmable current limit blanking time that supports short peak current events without power supply overdesign for lower solution cost; ±5% current share accuracy from phase-to-phase, which reduces inductor size; and resistor programmable switching frequency up to 2.1MHz, which improves EMI and reduces external components’ size and count.


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