原标题：Maxim MAX77650锂电池超低功耗充电解决方案

　　Maxim公司的MAX77650/MAX77651是具有三输出单电感多输出(SIMO)和充电器的超低功耗PMIC,为低功耗可穿戴应用提供高度集成的电池充电和电源解决方案.可编程快速充电电流7.5mA-300mA,可编程电池电压33.6V-4.6V,可编程端电流0.375mA-45mA,主要用在蓝牙耳机,健美健康和蔼活动监视器,物联网(IoT)和手持设备.本文介绍了MAX77650主要特性,框图,应用电路以及评估板MAX77650 EV主要特性,电路图,材料清单和PCB设计图.

　　The MAX77650/MAX77651 provide highly-integrated battery charging and power supply solutions for low-power wearable applications where size and efficiency are critical. Both devices feature a SIMO buck-boost regulator that provides three independently programmable power rails from a single inductor to minimize total solution size. A 150mA LDO provides ripple rejection for audio and other noise-sensitive applications. A highly configurable linear charger supports a wide range of Li+ battery capacities and includes battery temperature monitoring for additional safety (JEITA).

　　The devices include other features such as current sinks for driving LED indicators and an analog multiplexer that switches several internal voltage and current signals to an external node for monitoring with an external ADC. A bidirectional I2C interface allows for configuring and checking the status of the devices. An internal on/off controller provides a controlled startup sequence for the regulators and provides supervisory functionality when the devices are on. Numerous factory programmable options allow the device to be tailored for many applications, enabling faster time to market.

　　MAX77650主要特性:

　　Highly Integrated

　　Smart Power Selector™ Li+/Li-Poly Charger

　　3 Output,Single-Inductor Multiple-Output(SIMO)Buck-Boost Regulator 150mA LDO

　　3-Channel Current Sink Driver

　　Analog MUX Output for Power Monitoring

　　Low Power

　　0.3µA Standby Current

　　5.6µA Operating Current (3 SIMO Channels + LDO)

　　Charger Optimized for Small Battery Size

　　Programmable Fast-Charge Current from 7.5mA to 300mA

　　Programmable Battery Regulation Voltage from 3.6V to 4.6V

　　Programmable Termination Current from 0.375mA to 45mA

　　JEITA Battery Temperature Monitors Adjust Charge Current and Battery Regulation Voltage for Safe Charging

　　Flexible and Configurable

　　I2C Compatible Interface and GPIO

　　Factory OTP Options Available

　　Small Size

　　2.75mm × 2.15mm × 0.7mm

　　30-Pin, 0.4mm-Pitch WLP

　　Small Total Solution Size (28mm2)

　　MAX77650应用:

　　Bluetooth Headphones/Hearables

　　Fitness, Health, and Activity Monitors

　　Internet of Things (IoT)

　　Portable Devices

　　图1.MAX77650简化框图

　　图2.MAX77650典型应用电路图

　　评估板MAX77650 EV

　　The MAX77650 evaluation kit (EV kit) is a fully assembled and tested printed circuit board (PCB) that demonstrates the MAX77650. The EV kit allows for easy evaluation of the various MAX77650 features, including the SIMO buck-boost regulator, linear regulator, analog multiplexer, smart battery charger, on/off controller, and I2C interface.

　　Windows-based software provides a user-friendly graphical interface as well as a detailed register-based interface to exercise the features of the MAX77650.

　　评估板MAX77650 EV主要特性:

　　Easy to Use

　　GUI Drives I2C Interface

　　On-Board Ammeter

　　On-Board Thermistor

　　On-Key Options

　　RGB LED Cluster

　　Assembled and Fully Tested

　　Emulates System Loading

　　On-Board Electronic Loads

　　Electronic Loads have steady-state, transient, and random modes

　　Demonstrates End-to-End Analog Multiplexer Implementation

　　On-Board ADC

　　Evaluates Both Push-Button and Slider-Switch On-Key Options

　　评估板MAX77650 EV应用:

　　Bluetooth Headphones/Hearables

　　Fitness, Health, and Activity Monitors

　　Internet of Things (IoT)

　　Portable Devices

　　图3.评估板MAX77650 EV外形图

　　图4.评估板MAX77650 EV顶层元件布局图

　　图5.评估板MAX77650 EV底层元件布局图

　　图6.评估板MAX77650 EV电路图(1)

　　评估板MAX77650 EV材料清单: