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| MAX77818双路输入3A开关模式充电方案 |
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| 文章来源： 更新时间：2016/4/29 10:16:00 |
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Maxim公司的MAX77818是用于最新智能手机和平板电脑的高性能PMIC,百货公司双输入,带反向升压能力的智能功率通路3A开关模式充电器和适配输入保护高达16VDC以及有所有全的ModelGauge™ (m5)电量计量(FG)技术,支持USB OTG,无线充电输入高达5.9V.本文介绍了MAX77818主要特性和优势,框图,主电池充电器功能框图和应用电路,以及MAX77818评估系统优势和特性,电路图,材料清单和PCB设计图.
The MAX77818 is a high-performance companion PMIC for the latest smartphones and tablet computers. The PMIC includes a dual input, smart power path 3.0A switch mode charger with reverse boost capability and adapter input protection up to 16VDC withstand, proprietary ModelGauge™ (m5) fuel gauge technology.
The switch mode battery charger’s operating frequency is 4MHz and includes integrated, low-loss switches to provide the industry’s smallest L/C size, lowest heat, and fastest battery charging programmable up to 3.0A. The charger has two inputs that accept adapter/USB (CHIN) and/or wireless type inputs (WCIN). The wireless input can simultaneously charge the battery while powering USB-OTG type accessories. The USB-OTG output provides true-load disconnect and is protected by an adjustable output current limit.
The battery charger includes smart power path and I2C adjustable settings to accommodate a wide range of battery sizes and system loads. When external power is applied from either input, battery charging is enabled. With a valid input power source (adapter or wireless charger), the BYP pin voltage is equal to the input voltage minus resistive voltage drop. During battery-only reverse boost operation, the BYP output can be regulated with the reverse boost feature and provides up to 5V at 1.5A and requires no additional inductor, allowing the MAX77818 to power USB OTG accessories.
The switching charger is designed with a special CC, CV, and die temperature regulation algorithm. ModelGauge (m5) provides accurate battery fuel gauging without calibration and operates with extremely low battery current.
The safeout LDO drive system USB interface devices.The MAX77818 features a I2C revision 3.0-compatible serial interface that comprises a bidirectional serial data line(SDA) and a serial clock line (SCL).
MAX77818主要特性和优势:
Dual Input Switchmode Battery ChargerAdapter/USB InputUp to 13.4V Adapter Charging
Up to 4.0A rated, Input Current Protection(Programmable)
Wireless Charging InputUp to 5.9V Wireless Charging
Up to 1.26A, Input Current Protection(Programmable)
Support USB-OTG Accessories
Battery Charge Current, Up to 3.0ANo Sense Resistor
CC, CV, and Die Temperature Control
Integrated Battery True-Disconnect FET
RDS(ON) = 12.8mΩ
Rated Up to 4.5ARMS, Discharge Current Limit (Programmable)
Reverse Boost CapabilitySupports USB-OTG Accessories
Up to 5.1V/1.5A
Adjustable OCP
ModelGauge (m5) Battery Fuel Gauge±1% SOC Accuracy, No Calibration Cycles, Very Low IQ
Time-to-Empty and Time-to-Full Prediction
Two Safeout LDOs
I2C Serial Interface
72-Bump. 3.867mm x 3.608mm WLP with 0.4mm Pitch
MAX77818应用:
Smartphones and Tablets
Other Handheld Devices
图1.MAX77818框图
图2.MAX77818主电池充电器功能框图
图3.MAX77818典型应用电路图
MAX77818评估系统
The MAX77818 evaluation system (EV system) consists of a MAX77818 evaluation kit (EV kit) and a companion Maxim MINIQUSB interface board.
The MAX77818 EV kit is an assembled and tested PC board that demonstrates the MAX77818. The IC contains 12V input and 3A output switching mode charger.
The Maxim MINIQUSB interface board allows an IBM-compatible PC to use its USB port to emulate an I2C 2-wire interface. Windows XP®/Windows® 7 software provides a user-friendly interface to exercise the features of the MAX77818. The menu-driven program offers a graphical user interface with control buttons.
MAX77818评估系统优势和特性:
Demonstrates 12VCHGIN, 3A Charge
Demonstrates MG5 Fuel Gauge Performance
Demonstrates Dual Input Charge
Demonstrates OTG Mode
Evaluates MAX77818 Detail Performances
图4.MAX77818评估系统电路图
MAX77818评估系统材料清单:
图5. MAX77818评估系统PCB布局图
图6. MAX77818评估系统PCB布局图:顶层
图7. MAX77818评估系统PCB布局图:内部层2
图8. MAX77818评估系统PCB布局图:内部层3
图9. MAX77818评估系统PCB布局图:底层
图10. MAX77818评估系统PCB布局图:顶层装配图
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