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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

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Overview

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.

MAX16984: Typical Operating Circuit

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Key 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 61000-4-2
- ±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
- 28-Pin, 5mm x 5mm, TQFN and Side-Wettable QFND Packages

Applications/Uses

Automotive Connectivity
Automotive Radio and Navigation
Dedicated USB Power Charger
Telematics
USB Port for Host and Hub Applications

Parametric Specs

Part Number

V_IN
(V)

V_OUT1
(V)

Preset V_OUT
(V)

Output Adjust. Method

I_OUT1
(A)

Switch Type

Synchronous Switching

DC-DC Outputs

Oper. Freq.
(kHz)

Package/Pins

Budgetary
Price

min

max

min

max

See Notes

MAX16984

4.5

5.05

6.3

5.05

Preset

Resistor

2.5

Internal

Yes

2200

QFN/28

QFND/28

TQFN/28

$3.39 @1k

See All Step-Down Switching Regulators (380)

Part Number

Supported Charging Configurations

Supported USB Battery Charging Specification

Charging Modes

Current Limit Switch Control

CDP Emulation

Remote Wake-Up Support

V_BUS Reset Time
(sec)

Package/Pins

typ

MAX16984

Apple 1.0A

Apple 2.1A

China YD/T 1591-2009

USB CDP

USB Dedicated Charger

USB SDP

1.2

Auto Detection

Auto Detection with Apple 1A

Auto Detection with Apple 2A

CDP Emulation Pass-Through

Forced Dedicated Charger

Pass-Through

CEN

Yes

0.016

See Data Sheet

See All USB Host Adapter Emulator (21)

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.

Design Resources

MAX16984EVKIT: Evaluation Kit for the MAX16984

Quality And Environmental

Device	Fab Process	Technology	Sample size	Rejects	FIT at 25°C	FIT at 55°C

Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

Quality Management System >
Environmental Management System >

Order

Status:

Package:

Temperature:

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Technical Docs

Type	ID	Title
App Note	5810	Auto Infotainment - Driving the Course for Connectivity
Tutorial	5801	Overview of USB Battery Charging Revision 1.2 and the Important Role of Adapter Emulators
App Note	5709	Enable Automotive USB Power: Managing the Increasing Currents, Longer Cables, and Tight Portable-Device Specifications