MAX20037
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MAX20037

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

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Industry's First Synchronous USB Buck Converter with I2C and Protection/Host Charge Emulator

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Part Models 10
1ku List Price Starting From $1.71
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
    • 5V, 1.5A Output Current Capability (MAX20038A)
    • 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
Additional Details
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The MAX20037/MAX20038 ICs combine a 3.5A (or 1.5A for MAX20038A) 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 can be configured to be a 2.4A Apple® R30+ compliant solution.

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 ›

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MAX20037

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UPDATED 09/30/2021
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MAX20037: Automotive High-Current Step-Down Converter with USB Protection/Host Charger Adapter Emulation Data Sheet (Rev.10)

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ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.

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

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

Evaluation Kit

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MAX20037EVKIT

Evaluation Kit for the MAX20037

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MAX20037EVKIT

Evaluation Kit for the MAX20037

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MAX20037EVKIT
Evaluation Kit for the MAX20037

Features and Benefits

  • Configurable Charge-Detection Modes
    • 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
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Product Detail

The MAX20037 evaluation kit (EV kit) demonstrates the MAX20037 automotive high-current step-down DC-DC converter with USB protection/host charger adapter emulation.

The IC features integrated host-charger port detection circuitry adhering to 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 IC integrates high-side current-sensing and voltage adjustment circuitry that provides automatic USB voltage adjustment to compensate for voltage drops in captive cables associated with automotive applications.

The high-efficiency, step-down, synchronous, DC-DC converter operates from a voltage up to 28V and is protected from load-dump transients up to 40V. The converter is programmable for frequencies from 275kHz to 2.2MHz and can deliver 3A of continuous current at 105°C.

The EV kit is populated with an I2C-enabled MAX20037. The I2C interface allows for flexible configuration, detailed fault diagnostics, and access to the on-chip ADC that reports output voltage and current. The I2C features are easily accessed by using the Maxim command module (MINIQUSB) along with the provided example GUI.

The EV kit is configured for 2.2MHz operation, and the included 3m USB cable allows for demonstration of the cable-compensation capability of the IC. The EV kit comes with data-line tuning component pads populated with short circuits. Tuning components are usually not necessary for the low voltage, high-bandwidth data switches in MAX20037. Refer to Figure 17 in the MAX20037/MAX20038 IC data sheet for the MAX20037 untuned near-eye diagram.

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MAX20037EVKIT, MAX20038EVKIT Gerber File Download

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