MAX20037

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

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


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Description

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
Part NumberSupported Charging ConfigurationsSupported USB Battery Charging SpecificationCharging ModesCurrent Limit Switch ControlCDP EmulationRemote Wake-Up SupportVBUS Reset Time
(sec)
Package/PinsBudgetary
Price
typSee Notes
MAX20037 
Apple 1.0A
Apple 2.1A
China YD/T 1591-2009
Samsung Galaxy Tablet 2A
USB CDP
USB Dedicated Charger
USB SDP
1.2
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
CENYesNo0.016
TQFN-CU/28
$3.80 @1k
See All USB Host Adapter Emulator (21)
Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.


MAX20037EVKIT: Evaluation Kit for the MAX20037

Quality and Environmental Data

Request Reliability Report for: MAX20037 
Lead-Free Package Tin (Sn) Whisker Reports

Additional Resources

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


Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C  

Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

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