Analog Devices / Maxim Integrated MAX25432 Automotive Port Controller & Protector

Analog Devices MAX25432 Automotive Buck-Boost Port Controller and Protector is designed for an automotive USB host or downstream-facing (DFP) applications. The MAX25432 combines an automotive-grade buck-boost controller capable of full-range 3.3V to 21V programmable power supply (PPS) at up to 6.35A, a USB Power Delivery (USB PD) analog front-end (AFE), legacy USB charging support, and USB Type-C® protection switches. The protection switches deliver automotive system-level ESD protection and 24V short-circuit protection for D+, D-, CC1, CC2, and VCONN. The MAX25432 device optionally supports legacy charging modes for older passenger phones, including BC1.2, Apple® Charge, Apple CarPlay®, Apple MFi, and USB On-The-Go (OTG).

The Analog Devices MAX25432B integrates a USB PD AFE, which supports the USB-IF Type-C Port Controller Interface (TCPCI) specification and can interface with any I2C master in the application. Meanwhile, the MAX25432A provides configuration channel (CC) signal pass-through protection for an external USB PD controller. G-suffix devices include intelligent detection and protection to avoid high short-circuit currents flowing from the car battery through the cable shield to ground during fault events, thus preventing car module damage.

The MAX25432 is housed in a small, 6mm x 6mm, 40-pin TQFN-EP package and requires very few external components. The MAX25432 evaluation (EV) kit and collateral provide a convenient platform to the design engineer for rapid evaluation with reduced test and firmware development time.


  • USB PD PHY that is TCPCI-standard for use with any low-cost I2C master (Hub IC, MCU, SoC)
    • Ground offset adjusted BMC PHY for maximum signal-to-noise ratio
  • Non-TCPC versions available for protecting external USB PD controller (MAX25432A)
  • Integrated buck-boost controller for external H-bridge
    • 4.5V to 36V Input operating range
    • 220kHz, 300kHz, and 400kHz switching frequency
    • External frequency synchronization and spread spectrum for reduced EMI
  • USB PD PPS APDO support – TID 5821
    • 10mV Programmable voltage step size
    • 25mA Programmable current step size
  • Integrated cable compensation up to 516mΩ
  • AEC-Q100 and AEC-Q006 qualified
  • Highest performance, safest, and lowest cost passenger cable-shield short-to-battery protection
    • Minimizes short-circuit currents with a small, single-FET solution
  • Integrated high-side current-sense amplifiers, ADC and DAC
  • Integrated 3.3V to 5.0V, 1.5W, Smart, reliable VCONN switches and protection
    • 50mA Programmable overcurrent step size
  • Integrated 24V DC protection on protected HVD+, HVD-, HVCC1, HVCC2 outputs
  • Integrated legacy USB 2.0 charging support including BC1.2, Apple carplay, OTG, and Apple MFi Rev 3x
  • Integrated ±15kV Air-Gap/±8kV contact discharge ISO 10605 and IEC 61000-4-2 ESD protection
  • -40°C to +125°C Operating temperature range
  • 40-Pin, 6mm x 6mm, TQFN package with EP


  • USB hubs, breakout boxes, and multimedia hubs
  • Dedicated charging modules
  • Rear-seat entertainment modules
  • Head unit, radio, navigation

Simplified Block Diagram

Block Diagram - Analog Devices / Maxim Integrated MAX25432 Automotive Port Controller & Protector

Functional Block Diagram

Block Diagram - Analog Devices / Maxim Integrated MAX25432 Automotive Port Controller & Protector
Published: 2021-10-12 | Updated: 2023-04-17