MAX16984

RECOMMENDED FOR NEW DESIGNS

Automotive High-Current Step-Down Converter with USB Protection/Host Charger Adapter Emulator Industry's First USB Data Protection Switch that Integrates a High-Voltage, Feedback-Adjustable DC-DC Converter

Analog Devices MAX16984 Product Info

10 February 2026 6

Features

Integrated DC-DC and USB Host Charge Emulator Enables 1-Chip Solution Directly from Car Battery to Portable Device
- 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
- Spread Spectrum for EMI Reduction
- SYNC Input for Frequency Parking
Optimal USB Power and Communication for Portable Devices
- 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

Part details & applications

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 Specification BC1.2 battery charging specification and Chinese Telecommunication Industry Standard YD/T 1591-2009. They also include circuitry for iPod^®/iPhone^® 1.0A and 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.

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-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.

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

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