Top

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

Product Details

The MAX20461 combines a 3A high-efficiency, automotive-grade, step-down converter, a USB Type-C/BC1.2 host charger 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
    • MAX20461: USB Type-C Compliant DFP Controller with VCONN Protection
    • MAX20461A: USB Type-C Compliant DFP Controller
    • 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 474mΩ Cable Resistance
    • User-Programmable USB Current Limit
    • Type-C Cable Orientation Indicator for USB3 Applications
    • Supports USB BC1.2 CDP and SDP Modes
    • Compatible with USB On-the-Go Specification and Apple CarPlay®
  • 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
    • 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

Applications/Uses

  • Automotive Connectivity/Telematics
  • Automotive Radio and Navigation
  • USB Port for Host and Hub Applications
Parametric specs for USB Host Adapter Emulator
Charging Modes Auto Detection
Auto Detection with Apple 1A
Auto Detection with Apple 2A
CDP Emulation Pass-Through
Forced Dedicated Charger
Pass-Through
Samsung Galaxy Tablet 2A
Supported Charging Configurations Apple 0.5A
Apple 1.0A
Apple 2.1A
China YD/T 1591-2009
Samsung Galaxy Tablet 2A
USB CDP
USB Dedicated Charger
USB SDP
Supported USB Battery Charging Specification 1.2
CDP Emulation Yes
Remote Wake-Up Support Yes
VBUS Reset Time (sec) (typ) 0.016
Package/Pins TQFN-CU/32
View More

Technical Docs

Design & Development

Click any title below to view the detail page where available.

Description

The MAX20461 evaluation kit (EV kit) demonstrates the MAX20461 automotive high-current, high-efficiency, step-down DC-DC converter with integrated USB Type-C DFP controller and 1GHz bandwidth USB 2.0 D+/D- protection switches, which provide ESD and short-to-battery protection for low-voltage transceivers.

The MAX20461 features integrated host-charger port-detection circuitry that adheres to the USB Type-C specification, the USB-IF BC1.2 battery-charging specification, Apple iPod/iPhone/iPad® and Samsung® charge-detection termination resistors, and Chinese Telecommunication Industry Standard YD/T 1591-2009.

The MAX20461 integrates high-side current sensing and voltage adjustment circuitry, which provides automatic USB voltage adjustment to compensate for voltage drops in captive cables associated with automotive applications.

The MAX20461 step-down, synchronous, DC-DC converter operates from a voltage of up to 28V continuous and protects against load-dump transients up to 40V. The converter is programmable for frequencies from 275kHz to 2.2MHz and can deliver 3A continuously.

The EV kit contains an I2C-enabled MAX20461. The I2C interface allows for flexible configuration, detailed fault diagnostics, and access to the on-chip ADC that reports die temperature, output voltage, and output current. The I2C features are easily accessed using the Maxim MINIQUSB module and the provided example GUI.

The EV kit is configured for 2.2MHz operation. The data switches of the MAX20461 generally do not require far-eye tuning; the EV kit is populated with shorts.

View Details

Features

  • Configurable Charge-Detection Modes
    • USB-C 3.0A, 1.5A, 0.5A
    • USB-IF BC1.2 CDP, DCP
    • Apple 2.4A, 1.0A
    • China YD/T1591-2009 Charging Specification
  • Automatic USB Voltage Adjustment by Integrated DC-DC Converter (275kHz to 2.2MHz)
  • Proven PCB Layout
  • Fully Assembled and Tested

/en/design/design-tools/ee-sim.html?

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal

Parameters

Parametric specs for USB Host Adapter Emulator
Charging Modes Auto Detection
Auto Detection with Apple 1A
Auto Detection with Apple 2A
CDP Emulation Pass-Through
Forced Dedicated Charger
Pass-Through
Samsung Galaxy Tablet 2A
Supported Charging Configurations Apple 0.5A
Apple 1.0A
Apple 2.1A
China YD/T 1591-2009
Samsung Galaxy Tablet 2A
USB CDP
USB Dedicated Charger
USB SDP
Supported USB Battery Charging Specification 1.2
CDP Emulation Yes
Remote Wake-Up Support Yes
VBUS Reset Time (sec) (typ) 0.016
Package/Pins TQFN-CU/32

Key Features

  • One-Chip Type-C Solution Directly from Car Battery to Portable Device
    • MAX20461: USB Type-C Compliant DFP Controller with VCONN Protection
    • MAX20461A: USB Type-C Compliant DFP Controller
    • 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 474mΩ Cable Resistance
    • User-Programmable USB Current Limit
    • Type-C Cable Orientation Indicator for USB3 Applications
    • Supports USB BC1.2 CDP and SDP Modes
    • Compatible with USB On-the-Go Specification and Apple CarPlay®
  • 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
    • 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

Applications/Uses

  • Automotive Connectivity/Telematics
  • Automotive Radio and Navigation
  • USB Port for Host and Hub Applications

Description

The MAX20461 combines a 3A high-efficiency, automotive-grade, step-down converter, a USB Type-C/BC1.2 host charger 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.

Technical Docs

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal