Automotive boost controller shrinks Class-D audio amplifiers

Automotive boost controller shrinks Class-D audio amplifiers

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By Jean-Pierre Joosting

Analog Devices (ADI) has introduced 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 the company’s family of automotive boost controllers that include the MAX25201 and MAX25202 single/dual boost controllers, both designed for lower power applications.

The factory programmable gate drive voltage ranges from 5.5 V to 10 V and 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 over design for lower system cost. A ±5 percent current share accuracy from phase-to-phase reduces inductor size. Further, resistor programmable switching frequency up to 2.1 MHz improves EMI and reduces external components’ size and count.

The MAX25203 controller starts with a battery input voltage from 4.5 V 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 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.

The MAX25203 is available as of now in a 32-Lead TQFN-CU packaging. The MAX25203EVKIT Evaluation Board is also available as of now.

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