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

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.

Applications

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

* 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