Automotive 3.5A Buck Converter with I²C, USB Protection/Host Charge Emulator


  • 3.5A Synchronous buck converter
  • 2.2MHz switching frequency
  • I2C for cable compensation and diagnostics
  • Spread spectrum

Synchronous USB Buck Converter with I2C, Short to VBAT and Protection/Host Charge Emulator

The MAX20037/MAX20038 ICs combine a 3.5A automotive-grade step-down converter, USB host charger adapter emulator, and USB protection switches for automotive USB host applications. The device family also includes an USB load current-sense amplifier and configurable feedback-adjustment circuit, designed to provide automatic USB voltage compensation for voltage drops in captive cables often found in automotive applications. 

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  • One-Chip Solution Directly from Car Battery to Portable Device
    • 4.5V to 28V (40V Load Dump) Input Voltage
    • 5V, 3.5A Output Current Capability
    • Device-Attach Detection Output
    • Low-Q Current Skip and Shutdown Modes
  • 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
  • Optimal USB Power and Communication for Portable Devices
    • User-Programmable Voltage Gain Adjusts Output for Up to 600mΩ Cable Resistance
    • User-Programmable USB Current Limit
    • USB 480Mbps/12Mbps/1.5Mbps Data Switches
    • Integrated iPod®/iPhone®/iPad® and Samsung® Charge-Detection Termination Resistors
    • Supports USB BC1.2 CDP and DCP Modes
    • Supports China YD/T 1591-2009
    • Compatible with USB On-the-Go Specification
  • Robust Design Keeps Vehicle System and Portable Devices Safe in Automotive Environment
    • Short-to-Battery Protection on DC-DC Converter Pins
    • Short-to-VBUS Protection on USB Pins (MAX20037)
    • Short-to-Battery Protection on USB Pins (MAX20038)
    • ± 15kV Air/±8kV Contact ISO 10605
    • ± 15kV Air/±8kV Contact IEC 61000-4-2
    • Reduced Inrush Current with Soft-Start
    • Overtemperature Protection
    • -40°C to +125°C Operating Temperature Range