Product Details
Key Features
Applications/Uses
Charging Modes | Auto Detection Auto Detection with Apple 1A Auto Detection with Apple 2A CDP Emulation Pass-Through Forced Dedicated Charger Pass-Through |
Supported Charging Configurations | Apple 1.0A Apple 2.1A China YD/T 1591-2009 USB CDP USB Dedicated Charger USB SDP |
Supported USB Battery Charging Specification | 1.2 |
Current Limit Switch Control | CEN |
CDP Emulation | Yes |
Remote Wake-Up Support | No |
VBUS Reset Time (sec) (typ) | 0.016 |
Package/Pins | QFND/28 TQFN/28 |
VIN (V) (min) | 4.5 |
VIN (V) (max) | 28 |
VOUT1 (V) (min) | 5.05 |
VOUT1 (V) (max) | 6.3 |
IOUT1 (A) (max) | 2.5 |
Switch Type | Internal |
Preset VOUT (V) | 5.05 |
Output Adjust. Method | Preset Resistor |
Synchronous Switching? | Yes |
# DC-DC Outputs | 1 |
Switching Frequency (kHz) | 2200 |
Package/Pins | QFND/28 TQFN/28 |
Budgetary Price (See Notes) | $3.56 @1k |
Simplified Block Diagram
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Parameters
Charging Modes | Auto Detection Auto Detection with Apple 1A Auto Detection with Apple 2A CDP Emulation Pass-Through Forced Dedicated Charger Pass-Through |
Supported Charging Configurations | Apple 1.0A Apple 2.1A China YD/T 1591-2009 USB CDP USB Dedicated Charger USB SDP |
Supported USB Battery Charging Specification | 1.2 |
Current Limit Switch Control | CEN |
CDP Emulation | Yes |
Remote Wake-Up Support | No |
VBUS Reset Time (sec) (typ) | 0.016 |
Package/Pins | QFND/28 TQFN/28 |
VIN (V) (min) | 4.5 |
VIN (V) (max) | 28 |
VOUT1 (V) (min) | 5.05 |
VOUT1 (V) (max) | 6.3 |
IOUT1 (A) (max) | 2.5 |
Switch Type | Internal |
Preset VOUT (V) | 5.05 |
Output Adjust. Method | Preset Resistor |
Synchronous Switching? | Yes |
# DC-DC Outputs | 1 |
Switching Frequency (kHz) | 2200 |
Package/Pins | QFND/28 TQFN/28 |
Budgetary Price (See Notes) | $3.56 @1k |
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
Description
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.
Technical Docs
Support & Training
Search our knowledge base for answers to your technical questions.
Filtered SearchOur dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .