New Multi-Phase Synchronous Boost Controller Regulates High-Power Class-D Amplifiers in Automotive Infotainment Systems

Published  December 21, 2021   0
S Staff
MAX25203 Synchronous Boost Controller

Analog Devices, Inc. has introduced a highly efficient multi-phase synchronous boost controller that regulates high-power Class-D amplifiers in automotive infotainment systems. The new MAX25203 controller features both programmable gate drive voltage and current limit blanking time, along with accurate current balancing. This controller operates at a high switching frequency to reduce the bill of materials cost and shrink PCB space by 36 percent.

MAX25203 Circuit Diagram

The MAX25203 controller starts with a battery input voltage from 4.5V to 42V and operates down to 1.8V after start-up. Useful to generate backlight and Class-D audio amplifier voltages, this device offers I2C bus diagnostics including die temperature, phase current monitoring, and optional true shutdown to improve system reliability. Moreover, it sustains an absolute maximum output voltage of up to 70V and features a low shutdown supply current of 5µA.

MAX25203 Synchronous Boost Controller Key Features

  • Factory programmable gate drive voltage from 5.5V to 10V increases power density by reducing MOSFET Rdson 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.
  • +/- 5 percent current share accuracy from phase-to-phase reduces inductor size.
  • Resistor programmable switching frequency up to 2.1 MHz improves EMI and reduces external components’ size and count.

In addition, the output voltage is scalable via the PWM input or I2C interface and a sync-out feature supports additional phases for higher power systems.