Automotive High-Current Step-Down Converter with USB-C Dedicated Charging Port

Industry's Highest Integrated Automotive USB Type-C Charge Enumerator with Buck Converter

Please check latest availability status for a specific part variant.


The MAX20459 combines a 3A high-efficiency, automo- tive-grade, step-down converter, a USB Type-C DFP con- troller, and automatic BC1.2 DCP, Apple®, and Samsung® dedicated charger-detection circuitry. The device also includes a USB load current-sense amplifier and configurable feedback-adjustment circuit designed to provide automatic USB voltage compensation. The device limits the USB load current using both a fixed internal peak-cur- rent threshold and a user-configurable external current- sense USB load threshold.

The MAX20459 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 application require- ments. The fully synchronous DC-DC converter integrates high-side and low-side MOSFETs along with an external SYNC input/output, and can be configured for spread- spectrum operation. Additionally, thermal foldback is im- plemented to avoid excessive heating of the module while charging at high ambient temperature.

TThe MAX20459 allows flexible configuration and ad- vanced diagnostic options for both standalone and super- vised applications. The device can operate as a true one- chip solution that offers advanced fault autorecovery and can be programmed using external programming resistors and/or internal I2C registers.

The MAX20459 is available in a small 5mm x 5mm 32-pin TQFN package and is designed to minimize required ex- ternal components and layout area..

MAX20459: Typical Application Circuits MAX20459: Typical Application Circuits Enlarge+

Key Features

  • One-Chip Type-C Solution Directly from Car Battery to Portable Device
    • USB Type-C-Compliant DFP Controller
    • Integrated iPhone®/iPad®, Samsung® and BC1.2 DCP Charger Detection
    • 4.5V to 28V Input (40V Load Dump), Synchronous Buck Converter
    • 5V to 7V, 3A Output Capability
    • Standalone Device or I2C Configuration Options and Fault Autorecovery
  • Optimal USB Charging and Communication for Portable Devices
    • User-Programmable Voltage Gain Adjusts Output for up to 474mΩ Cable Resistance
    • User-Programmable USB Current Limit
  • Low-Noise Features Prevent Interference with AM Band and Portable Devices
    • Fixed-Frequency 310kHz 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
    • ±15kV Air/±8kV Contact ISO 10605 (330pF, 330Ω)*
    • ±15kV Air/±8kV Contact ISO 10605 (330pF, 2kΩ)*
    • ±15kV Air/±8kV Contact IEC 61000-4-2 (150pF, 330Ω)*
    • Overtemperature Protection, Warning, and Intelligent Current Foldback
    • AEC-Q100 Qualified
    • -40°C to +125°C Operating Temperature Range


  • Dedicated Charging Modules
  • Dedicated USB Charging Port (DCP)
  • Host and Hub Module Dedicated Charging Ports

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.

MAX20459EVKIT: Evaluation Kit for the MAX20459
Request Reliability Report for: MAX20459 
Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C   Material Composition  

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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    Automotive High-Current Step-Down Converter with USB-C Dedicated Charging Port

    • One-Chip Type-C Solution Directly from Car Battery to Portable Device
    • Optimal USB Charging and Communication for Portable Devices
    • Low-Noise Features Prevent Interference with AM Band and Portable Devices

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