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Automotive High-Current Step-Down Converter with
USB Protection/Host Charger Adapter Emulator
MAX16984
General Description
Benefits and Features
● Integrated DC-DC and USB Host Charge Emulator
Enables 1-Chip Solution Directly from Car Battery to
Portable Device
The MAX16984 combines a 5V automotive-grade step-
down converter capable of driving up to 2.5A, a USB host
charger adapter emulator, and USB protection switches
for automotive USB host applications. The USB protection
switches provide high-ESD, short-circuit protection and
feature integrated host-charger port-detection circuitry
adhering to the USB 2.0 Battery Charging Specifica-
tion BC1.2 battery charging specification and Chinese
Telecommunication Industry Standard YD/T 1591-2009.
• 4.5V to 28V (42V Load Dump) Operating Voltage
• 5V, 2.5A Output Current Capability
• Low-Q Current Skip and Shutdown Modes
• Soft-Start Reduces Inrush Current
● Low-Noise Features Prevent Interference with AM
Band and Portable Devices
®
®
• Fixed-Frequency 220kHz to 2.2MHz Operation
• Forced-PWM Option at No Load
They also include circuitry for iPod /iPhone 1.0A and
®
iPad 2.1A dedicated charging modes. The HVD+ and
• Spread Spectrum for EMI Reduction
• SYNC Input for Frequency Parking
HVD- ESD protection features include protection to ±15kV
Air/±8kV Contact on the HVD+ and HVD- outputs to the
IEC 61000-4-2 model and 330Ω, 330pF ESD model.
● Optimal USB Power and Communication for
Portable Devices
The high-efficiency step-down DC-DC converter
operates from a voltage up to 28V and is protected
from load dump transients up to 42V. The device is opti-
mized for high-frequency operation and includes resistor-
programmable frequency selection from 220kHz to 2.2MHz
to allow optimization of efficiency, noise, and board space
based on application requirements. The converter has
an internal high-side n-channel switch and uses a low
forward-drop freewheeling Schottky diode for rectification.
There is a small low-side n-channel switch to maintain fixed
frequency under light loads. For lower quiescent current
operation requirements, the low side n-channel switch can
be disabled to allow skip mode operation under light loads.
The converter can deliver up to 2.1A of continuous current
at 105°C. The MAX16984S has an integrated spread-
spectrum oscillator to improve EMI performance.
• User-Adjustable Voltage Gain Adjusts Output
Between 5V and 6.15V for Cable Compensation
• ±3% Accuracy User-Adjustable USB Current Limit
• 4Ω USB 2.0 480Mbps/12Mbps Data Switches
• Integrated iPod/iPhone/iPad Charge-Detection
Termination Resistors
• Supports USB BC1.2 Charging Downstream Port
(CDP) and Dedicated Charging Port (DCP) Modes
• Supports Chinese Telecommunication Industry
Standard YD/T 1591-2009
• Compatible with USB On-the-Go Specification
• High-Speed Pass-Through Mode
● Robust Design Keeps Vehicle System and
Portable Devices Safe in Automotive Environment
• Short-to-Battery Protection on DC-DC Converter
• Short-to-Battery Protection on USB Pins
• ±25kV Air/±8kV Contact ISO 10605
• ±15kV Air/±8kV Contact IEC 61000-4-2
• ±15kV Air/±8kV Contact (330Ω, 330pF)
• Fault-Indication Active-Low, Open-Drain Output
• Reduced Inrush Current with Soft-Start
• Overtemperature Protection
The MAX16984 also includes a USB load current-sense
amplifier and configurable feedback adjustment circuit
designed to provide automatic USB voltage adjustment to
compensate for voltage drops in captive cables associated
with automotive applications. The MAX16984 limits 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.
• -40°C to +125°C Operating Temperature Range
• 28-Pin, 5mm x 5mm, TQFN and Side-Wettable
QFND Packages
• 4mm x 4mm, 28-Pin CPQFN and Side-Wettable
version available
Applications
● Automotive Radio and Navigation
● USB Port for Host and Hub Applications
● Automotive Connectivity
Ordering Information and Typical Operating Circuit appear at
end of data sheet.
● Telematics
● Dedicated USB Power Charger
iPod, iPhone, and iPad are registered trademarks of Apple, Inc.
19-6627; Rev 8; 3/21
©
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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