MAX20038

Description

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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 a 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. The ICs limit the USB load current using both a fixed internal peak-current threshold of the DC-DC converter and a user-configurable external USB load current-sense amplifier threshold.

The ICs allow flexible configuration options for both stand-alone and supervised applications, and can be programmed for desired operation using both external programming resistors and/or internal I²C registers through the I²C bus.

The ICs are optimized for high-frequency operation and include programmable frequency selection from 310kHz to 2.2MHz, allowing optimization of efficiency, noise, and board space based on application requirements. The fully synchronous DC-DC converters feature integrated high-side and low-side MOSFETs, an external SYNC input/output, and can be configured for spread-spectrum operation.

The MAX20037/MAX20038 are available in a small (5mm x 5mm) 28-pin TQFN package (side-wettable available) designed to minimize required components and layout area.

Design Solution: Add Even More USB Ports to Your Car—In Less Space ›

Key Features

• 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

Applications/Uses

• Automotive Connectivity/Telematics
• Automotive Radio and Navigation
• Dedicated USB Charging Port (DCP)
• USB Port for Host and Hub Applications