MAX16984

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


Description

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 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.

Key Features

  • High-Efficiency DC-DC Controller
    • 4.5V to 28V (42V Load Dump) Operating Voltage
    • 5V, 2.5A Output Current Capability
    • User-Adjustable USB Current Limit
    • Fixed-Frequency 220kHz to 2.2MHz Operation
    • Forced-PWM Option at No Load
    • Spread Spectrum for EMI Reduction
    • SYNC Input for Frequency Parking
    • Low Q Current Skip Mode and Low Q Shutdown
    • Reduced Inrush Current by Soft-Start
  • Integrated Output Adjustment for Cable Voltage Drop
    • User-Adjustable Voltage Gain
    • Up to 3 Meter Cable/Up to 600mΩ
  • USB D+/D- Protection and Host Charger Emulator
    • 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
    • Chinese Telecommunication Industry Standard YD/T 1591-2009
    • High-Speed Pass-Through Mode
    • Short to Battery and Short to VBUS Protection
    • Compatible with USB On-the-Go Specification
  • Split Supplies SUP and SUPSW Minimize Power Consumption
  • Fault Indication Active-Low Open-Drain Output
  • Automotive Grade ESD Protection (HVD±)
    • ±25kV Air/±8kV Contact ISO 10605
    • ±15kV Air/±8kV Contact IEC 61000-4-2
    • ±15kV Air/±8kV Contact (330Ω, 330pF)
  • Overtemperature and Short-Circuit Protection
  • 5mm × 5mm, 28-Pin TQFN and Side-Wettable QFND Packages
  • -40°C to +125°C Operating Temperature Range

Applications/Uses

  • Automotive Connectivity
  • Automotive Radio and Navigation
  • Dedicated USB Power Charger
  • Telematics
  • USB Port for Host and Hub Applications
Part Number VIN
(V)
VIN
(V)
VOUT1
(V)
VOUT1
(V)
Preset VOUT
(V)
Output Adjust. Method IOUT1
(A)
Switch Type Synchronous Switching DC-DC Outputs Oper. Freq.
(kHz)
min max min max max
MAX16984  4.5 28 5.05 6.3 5.05
Preset
Resistor
2.5 Internal Yes 1 2200
See All Step-Down Switching Regulators (317)
Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.

 

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