ABRIDGED DATA SHEET
EVALUATION KIT AVAILABLE
MAX16984
Automotive High-Current Step-Down Converter with
USB Protection/Host Charger Adapter Emulator
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 Mode and Shutdown Modes
• Soft-Start Reduces Inrush Current
● Low-Noise Features Prevent Interferene with AM
Band and Portable Devices
®
®
They also include circuitry for iPod /iPhone 1.0A and
• Fixed-Frequency 220kHz to 2.2MHz Operation
• Forced-PWM Option at No Load
• Spread Spectrum for EMI Reduction
• SYNC Input for Frequency Parking
®
iPad 2.1A dedicated charging modes. The HVD+ and
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 optimized
for high-frequency operation and includes resistor-pro-
grammable 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 lowside 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 Be-
tween 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
• 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 (330I, 330pF)
• Fault-Indication Active-Low, Open-Drain Output
• Reduced Inrush Current with Soft-Start
• Overtemperature Protection
• -40NC to +125NC Operating Temperature Range
• 28-Pin, 5mm x 5mm, TQFN and Side-Wettable
QFND Packages
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 associat-
ed 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.
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.
iPod, iPhone, and iPad are registered trademarks of Apple, Inc.
● Telematics
● Dedicated USB Power Charger
19-6627; Rev 6; 5/18
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