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MAX16984A
Automotive High-Current Step-Down Converter
with USB Protection/Host Charger Adapter
Emulator
General Description
Benefits and Features
The MAX16984A combines a 5V automotive-grade step-
down converter capable of driving up to 3.0A, 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 ad-
hering to the USB 2.0 BC 1.2 Battery Charging Specifica-
tion, Samsung® and Chinese Telecommunication Indus-
try Standard YD/T 1591-2009. They also include circuit-
ry for Samsung 2.0A, iPod®/iPhone®/iPad® 2.4A dedicat-
ed 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 ISO model.
● Integrated DC-DC and USB Host Charge Emulator
Enables 1-Chip Solution Directly from Car Battery to
Portable Device
• 4.5V to 28V (40V Load Dump) Operating Voltage
• 5V, 3.0A 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 310kHz to 2.2MHz Operation
• Forced-PWM Option at No Load
• Spread Spectrum for EMI Reduction
• SYNC Input/Output for Frequency Parking
● 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 40V. The device is optimized for
high-frequency operation and includes resistor-program-
mable frequency selection from 310kHz to 2.2MHz to al-
low optimization of efficiency, noise, and board space
based on application requirements. The fully synchronous
DC-DC converter integrates high-side and low-side MOS-
FETs with an external SYNC input/output, and can be con-
figured for spread-spectrum operation. Skip mode is avail-
able in light/no-load conditions to minimize quiescent cur-
rent. The converter can deliver up to 3A of continuous cur-
rent at 105°C. The MAX16984A has an integrated spread-
spectrum oscillator to improve EMI performance.
• User-Adjustable Voltage Gain Adjusts Output
Between 5V and 7V for Cable Compensation
• ±5% Accuracy User-Adjustable USB Current Limit
• 4Ω USB 2.0 1GHz Data Switches
• Integrated Samsung/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 (SDP)
● 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
• ±15kV Air/±8kV Contact ISO 10605*
The MAX16984A also includes a USB load current-sense
amplifier and configurable feedback adjustment circuit de-
signed to provide automatic USB voltage adjustment to
compensate for voltage drops in captive cables associat-
ed with automotive applications. The MAX16984A limits
the USB load current using both a fixed internal peak cur-
rent threshold of the DC-DC converter and a user-config-
urable external USB load current-sense amplifier thresh-
old.
• ±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
• -40°C to +125°C Operating Temperature Range
• 32-Pin, 5mm x 5mm, TQFN Package
Applications
● Automotive Radio and Navigation
● USB Port for Host and Hub Applications
● Automotive Connectivity
*Tested in Typical Application Circuit as used on the
MAX16984A Evaluation Kit
● Telematics
● Dedicated USB Power Charger
Ordering Information and Typical Application Circuit
appear at end of data sheet.
iPod, iPhone, and iPad are registered trademarks of Apple, Inc. Samsung is a registered trademark of Samsung Electronics Co., Ltd.
19-100762; Rev 2; 12/20
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