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Automotive High-Current Step-Down Converter with
USB Protection/Host Charger Adapter Emulation
MAX20037/MAX20038
General Description
Benefits and Features
● One-Chip Solution Directly from Car Battery to
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 applica-
tions. 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
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
®
Apple R30+ compliant solution.
The ICs allow flexible configuration options for both
stand-alone and supervised applications, and can be pro-
grammed for desired operation using both external pro-
● Optimal USB Power and Communication for Portable
Devices
2
• User-Programmable Voltage Gain Adjusts Output
for Up to 600mΩ Cable Resistance
gramming resistors and/or internal I C registers through
2
the I C bus.
• 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
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.
®
®
®
®
• 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
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.
• 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
Applications
● Automotive Radio and Navigation
● USB Port for Host and Hub Applications
● Automotive Connectivity/Telematics
● Dedicated USB Charging Port (DCP)
• -40°C to +125°C Operating Temperature Range
Ordering Information and Typical Operating Circuit appear
at the end of data sheet.
Simplified Typical Operating Circuit
VBAT
*Tested in Typical Operating Circuit, as used on the
MAX20037/MAX20038 Evaluation Kit.
MAX20037
MAX20038
DC-DC + USB
CAPTIVE
USB
CABLE
RADIO
HEAD
+5V
HVD-
Apple, iPod, iPhone, and iPad are registered trademarks of
Apple Inc.
USB HOST
CONNECTOR
PORTABLE
DEVICE
D-
USB
PHY
HVD+
D+
Samsung is a registered trademark of Samsung Electronics
Co., Ltd.
19-100104; Rev 10; 8/21
©
2021 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners.
One Analog Way, Wilmington, MA 01887 U.S.A. Tel: 781.329.4700 © 2021 Analog Devices, Inc. All rights reserved.
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