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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

Product Details

Key Features

Parametric specs for USB Host Adapter Emulator
Charging Modes 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
Supported Charging Configurations Apple 1.0A
Apple 2.1A
China YD/T 1591-2009
Samsung Galaxy Tablet 2A
USB CDP
USB Dedicated Charger
USB SDP
Supported USB Battery Charging Specification 1.2
Current Limit Switch Control CEN
CDP Emulation Yes
Remote Wake-Up Support No
VBUS Reset Time (sec) (typ) 0.016
Package/Pins TQFN-CU/28
Budgetary
Price (See Notes)
1.45
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Simplified Block Diagram

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Parameters

Parametric specs for USB Host Adapter Emulator
Charging Modes 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
Supported Charging Configurations Apple 1.0A
Apple 2.1A
China YD/T 1591-2009
Samsung Galaxy Tablet 2A
USB CDP
USB Dedicated Charger
USB SDP
Supported USB Battery Charging Specification 1.2
Current Limit Switch Control CEN
CDP Emulation Yes
Remote Wake-Up Support No
VBUS Reset Time (sec) (typ) 0.016
Package/Pins TQFN-CU/28
Budgetary
Price (See Notes)
1.45

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
    • 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

Applications/Uses

Description

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 ›

Simplified Block Diagram

MAX20037: Simplified Typical Operating Circuit MAX20037: Simplified Typical Operating Circuit Zoom icon

Technical Docs

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .