Dual 3A USB DCP Charger

The MAX20047 is an automotive-grade, low-cost, small-footprint dual-port charger IC designed for automotive charging applications. It combines a fully synchronous 6A step-down buck converter with integrated high-side and low-side FETs capable of operating with input voltages from 3.5V to 36V and delivering 5.2V output voltage. The IC features integrated iPod®/iPhone®1.0A and iPad® 2.1A dedicated charging modes.

The IC delivers up to 3A of charging current with 93% efficiency per port through integrated switches with programmable current limit and thermal foldback control. The buck converter switching frequency is programmable from 0.4MHz to 2.2MHz. Short-to-ground protection and overcurrent protection are also provided on the protected HVBUS outputs to protect the internal BUS power rail from an overcurrent fault. The MAX20047 offers short-to-battery up to +18V and can also be ordered with spread-spectrum operation to reduce EMI.

iPod, iPhone, and iPad are registered trademarks of Apple Inc..

Design Solution: Beat the Heat: Build a Compact, Multi-Standard Dual USB Charger ›

Applications

* Automotive Cigarette Lighter Adapters * Power Supply for Linear Chargers * USB Dedicated Charging Ports (DCP)

* Operating VIN Range of 3.5V to 36V

* 40V Load-Dump Protection

* Synchronous DC-DC Converter with Integrated FETs

* 93% Charge Efficiency at 3A Charging

* 0.4MHz to 2.2MHz Programmable Switching Frequency by External Pin Settings

* Spread-Spectrum Operation

* Fixed 8ms Internal Soft-Start

* 5.20V Output

* 99% Duty-Cycle Operation with Low Dropout

* ±2% Output-Voltage Accuracy

* Input System Overvoltage and Short-Circuit Protection

* Accurate SRCDMOS Current Limiting with Minimal Voltage Drop

* Low RON 15mΩ Dual USB Power Switches

* Adjustable SRCDMOS Current Limit by External Pin Settings

* Integrated Current Sensing

* Thermal Regulation and Thermal Shutdown

* Dual Autonomous Battery-Charging Ports with Portable Device Detection

* Integrated Apple® 2.4A, 2.1A, 1.0A Detection

* Integrated Samsung® Detection

* Integrated DCP Detection

* Robust for the Automotive Environment

* Short-to-Battery and Short-to-Ground Protection on Protected SRCDMOS Output

* Short-to-Battery and Short-to-PV Protection on Protected HVDP1, HVDM1, HVDP2, and HVDM2 Inputs

* Tested to ISO 10605 and IEC 61000-4-2 ESD Standards

* 20-Pin (5.0mm x 3.5mm) FC2-QFN Package

* -40°C to +125°C Operating Temperature Range

* AEC-Q100 Qualified