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[原创] Maxim MAX14748 USB Type-C锂电池充电解决方案

关键词:电源管理,USB Type-C充电器,锂电池, MAX14748

来源:中电网    2017-11-15

Maxim公司的MAX14748是USB Type-C充电器,集成了充电检测器,升压/降压转换器和带智能功率选择器的锂电池充电器,支持USB Type-C 1.1标准的UFP/DRP功能,JEITA 充电保护,±15kV ESD保护,主要用在数字图像(DSC,DVC),无线扬声器和手持条码扫描器.本文介绍了MAX14748主要优势和特性,框图,系统框图以及评估板MAX14748 EVK主要特性.电路图,材料清单和PCB设计图.

The MAX14748 USB battery charger integrates a charger detector, boost/buck converter, and Li+ battery charger with smart power selector to provide fast and safe charging of 2s Li+ battery packs.

The MAX14748 provides support for devices functioning as a UFP/DRP per the USB Type-C 1.1 standard, while also providing detection of legacy USB Battery Charging Specification, Revision 1.2 (BC1.2) compliant chargers in addition to other nonstandard chargers. The programmable Automatic Input Current Limiting (AICL) feature ensures that maximum safe current is drawn from the charging adapter.

The Li+ charger includes an automatic Smart Power Selector™ to simultaneously charge the battery and provide power to the system load. The Smart Power Selector function will supplement the system power with the battery if power from the charging adapter is insufficient. The Li+ charger features JEITA thermal monitoring and charger voltage/current reduction or charger disable.

The MAX14748 is available in a 54-bump, 0.4mm pitch, 3.97mm x 2.77mm x 0.64mm wafer-level package (WLP) and operates over the -40 ℃ to +85℃ extended temperature range

MAX14748主要优势和特性:

Minimize Power Management Footprint Through High Integration 13mΩ (typ) Integrated Battery To System Switch
Thermal Current Limiting
DC-DC Converter with Boost and Reverse Buck
High Efficiency92% in Boost Mode at 1A Output Current and 7.4V Battery Voltage
94% in Reverse Buck Mode at 500mA Output
Internal USB Switch for USB D+/D- Data Lines
Easy-to-Implement Li+ Battery ChargingCharges 2s Li-Ion Batteries from Legacy 5V USB Adapters15W Input Power with 3A Type-C Adapter
7.5W Input Power with DCP Adapter
1A System/Charge Current From DCP Adapter
2A System/Charge Current From 3A Type-C Adapter
USB Type-C Specification, Rev 1.1 Support
UFP/DRP Operation
VCONN and Super-Speed Multiplexer Logic Controls
Non-Standard DCP Detection
USB Battery Charging Specification, Rev 1.2 Compliant
Automatic Input Current Limit (AICL) Power Management
Support Weak/Dead Batteries DetectionSmart Power Selector
Thermistor Monitor
Various Protection Features28V Integrated Overvoltage Protection
JEITA Charge Protection
±15kV ESD Protection on USB Adapter Pins

MAX14748应用:

Digital Imaging (DSC, DVC)
Wireless Speakers
Handheld Barcode Readers

图1.MAX14748框图

图2.MAX14748应用框图

评估板MAX14748 EVK

The MAX14748 evaluation kit (EV kit) is a fully assembled and tested circuit for evaluating the MAX14748 USB Type-C charger. Refer to the MAX14748 IC data sheet for detailed information regarding the operation and features of the devices. For additional information, please refer to the MAX14748 user guide.
评估板MAX14748 EVK主要特性:

RoHS Compliant
Proven PCB Layout
Full Assembled and Tested
I2C Serial Interface

图3.评估板MAX14748 EVK电路图(1)

图4.评估板MAX14748 EVK电路图(2)
评估板MAX14748 EVK材料清单:



图5.评估板MAX14748 EVK PCB设计图(1):左:顶层模板;右:顶层走线

图6.评估板MAX14748 EVK PCB设计图(2):左:层2 GND地;右:层3 SIGS

图7.评估板MAX14748 EVK PCB设计图(3):左:底层;右:底层模板

图8.评估板MAX14748 EVK PCB设计图(4):左:顶阻焊层;右:底阻焊层

图9.评估板MAX14748 EVK PCB设计图(5):左:顶层丝印;右:底层丝印
详情请见:
https://datasheets.maximintegrated.com/en/ds/MAX14748.pdf
https://datasheets.maximintegrated.com/en/ds/MAX14748EVKIT.pdf
MAX14748.pdf
MAX14748EVKIT.pdf

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