Automotive High-Current Step-Down Converter with USB-C Protection/Host Charger

Industry's First Automotive Single Chip USB Type-C Charge Enumerator with Buck Converter

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The MAX20461 combines a 3A high-efficiency, automotive-grade, step-down converter, a USB Type-C/BC1.2 host charger-adapter emulator, and high-bandwidth USB protection switches for automotive USB 2.0 host applications. The device also includes a USB load current-sense amplifier and a configurable feedback-adjustment circuit that provides automatic USB voltage compensation for voltage drops in captive cables often found in automotive applications. The device limits the USB load current using both a fixed internal peak-current threshold and a user-configurable external current-sense USB load threshold.

The MAX20461 is optimized for high-frequency operation and includes programmable frequency selection from 310kHz to 2.2MHz, allowing optimization of efficiency, noise, and board space based on the application requirements. The fully synchronous DC-DC converter integrates high-side and low-side MOSFETs with an external SYNC input/output, and can be configured for spread-spectrum operation.

The MAX20461 allows flexible configuration and advanced diagnostic options for both stand-alone and supervised applications. The device can be programmed using either external programming resistors and/or internal I²C registers through the I²C bus.

The MAX20461 is available in a small, 5mm x 5mm 32-pin TQFN package. It is designed to minimize required external components and layout area.

Key Features

  • One-Chip Type-C Solution Directly from Car Battery to Portable Device
    • USB Type-C Compliant DFP Controller with VCONN Protection
    • 1GHz Bandwidth USB 2.0 Data Switches
    • 4.5V to 28V Input (40V Load Dump), Synchronous Buck Converter
    • 5V to 7V, 3A Output Capability
  • Optimal USB Charging and Communication for Portable Devices
    • User-Programmable Voltage Gain Adjusts Output for Up to 500mΩ Cable Resistance
    • User-Programmable USB Current Limit
    • Type-C Cable Orientation Indicator for USB3 Applications
    • Integrated Apple® and Samsung® Dedicated Charger Termination Resistors
    • Supports USB BC1.2 CDP and DCP Modes
    • Supports China YD/T 1591-2009
    • Compatible with USB On-the-Go Specification and Apple CarPlay®
  • Low-Noise Features Prevent Interference with AM Band and Portable Devices
    • Fixed-Frequency 275kHz to 2.2MHz Operation
    • Fixed-PWM Option at No Load
    • Spread Spectrum for EMI Reduction
    • SYNC Input/Output for Frequency Parking
  • Robust Design Keeps Vehicle System and Portable Device Safe in an Automotive Environment
    • Short-to-Battery Protection on VBUS, HVD± Pins
    • CC1 and CC2 Tolerant to 20V Transients
    • Advanced Diagnostics Through I²C Bus
    • ±25kV Air/±8kV Contact ISO 10605 (330pF, 2kΩ)*
    • ±15kV Air/±8kV Contact IEC 61000-4-2 (150pF, 330Ω)*
    • ±15kV Air/±8kV Contact (330pF, 330Ω)*
    • Overtemperature Protection, Warning, and Intelligent Current Foldback
    • -40°C to +125°C Operating Temperature Range


  • Automotive Connectivity/Telematics
  • Automotive Radio and Navigation
  • Dedicated USB Charging Port (DCP)
  • USB Port for Host and Hub Applications
Part NumberSupported Charging ConfigurationsSupported USB Battery Charging SpecificationCharging ModesCDP EmulationRemote Wake-Up SupportVBUS Reset Time
Apple 0.5A
Apple 1.0A
Apple 2.1A
China YD/T 1591-2009
Samsung Galaxy Tablet 2A
USB Dedicated Charger
Auto Detection
Auto Detection with Apple 1A
Auto Detection with Apple 2A
CDP Emulation Pass-Through
Forced Dedicated Charger
Samsung Galaxy Tablet 2A
See All USB Host Adapter Emulator (21)
Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.

MAX20461EVKIT: Evaluation Kit for the MAX20461

Quality and Environmental Data

Request Reliability Report for: MAX20461 
Lead-Free Package Tin (Sn) Whisker Reports

CAD Symbols and Footprints

  • MAX20461ATJA/V+
  • MAX20461ATJB/V+
  • MAX20461ATJD/V+
  • Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C  

    Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

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