原标题：基于Maxim公司的MAX77650/MAX77651用于低功耗可穿戴设备充电电源解决方案

　　Maxim公司的MAX77650/MAX77651是用于低功耗可穿戴的高度集成电池充电和电源解决方案,两种器件具有单个电感多个输出(SIMO)降压/升压稳压器,150mA LDO以及高度可配置线性充电器,0.3μA待机电流,主要用在蓝牙耳机/智能耳戴式设备,健身,保健和运动监测,手持设备和物联网(IoT).本文介绍了MAX77650/MAX77651主要优势和特性,框图,应用电路,以及评估板MAX77650/MAX77651 EVK主要特性,框图,电路图,材料清单和PCB设计图.

　　The MAX77650/MAX77651 provides 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/MAX77651主要优势和特性:

　　Highly IntegratedSmart 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 Power0.3μA Standby Current

　　5.6μA Operating Current (3 SIMO Channels + LDO)

　　Charger Optimized for Small Battery SizeProgrammable 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 ConfigurableI2C Compatible Interface and GPIO

　　Factory OTP Options Available

　　Small Size2.75mm x 2.15mm x 0.7mm WLP Package

　　30-Bump, 0.4mm-Pitch WLP, 6x5 Array

　　Small Total Solution Size (19.2mm2)

　　MAX77650/MAX77651应用:

　　Bluetooth Headphones/Hearables

　　Fitness, Health, and Activity Monitors

　　Portable Devices

　　Internet of Things (IoT)

　　图1.MAX77650简化系统框图

　　图2.MAX77650/MAX77651框图

　　图3.MAX77650/MAX77651典型应用电路图

　　评估板MAX77650/MAX77651 EVK

　　The MAX77650/MAX77651 evaluation kit (EV kit) is a fully assembled and tested printed circuit board (PCB) that demonstrates the MAX77650/MAX77651. The EV kit allows for easy evaluation of the various MAX77650/ MAX77651 features, including the SIMO buck-boost regu­lator, linear regulator, analog multiplexer, smart battery charger, on/off controller, and I2C interface.

　　The MAX77650 and MAX77651 EV kits are identical aside from the device (U1), silkscreen, and two resis­tive dividers at the SIMO outputs. The MAX77650/ MAX77651 devices themselves have different output volt­age ranges for the SIMO buck-boost regulator. Consult the device data sheet for more information.

　　Windows®-based software provides a user-friendly graph­ical interface as well as a detailed register-based interface to exercise the features of the MAX77650/MAX77651.

　　评估板MAX77650/MAX77651 EVK主要特性:

　　Easy to Use

　　GUI Drives I2C Interface

　　On-Board Battery 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

　　图4.评估板MAX77650/MAX77651 EVK外形图(正面)

　　图5.评估板MAX77650/MAX77651 EVK外形图(背面)

　　图6.评估板MAX77650/MAX77651 EVK框图

　　图7.评估板MAX77650/MAX77651 EVK 电路图(1)

　　图8.评估板MAX77650/MAX77651 EVK 电路图(2)

　　图9.评估板MAX77650/MAX77651 EVK 电路图(3)

　　图10.评估板MAX77650/MAX77651 EVK 电路图(4)

　　图11.评估板MAX77650/MAX77651 EVK 电路图(5)

　　评估板MAX77650/MAX77651 EVK材料清单:

　　图12.评估板MAX77650/MAX77651 EVK PCB设计图(1):左:顶层丝印右:顶层布局

　　图13.评估板MAX77650/MAX77651 EVK PCB设计图(2):左:内层2右:内层3

　　图14.评估板MAX77650/MAX77651 EVK PCB设计图(3):左:底层布局右:底层丝印

　　详情请见:

si3406x-datasheet.pdf

ug333-si34061isoc4evb.pdf