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)

图7.评估板MAX77650 EV电路图(2)

图8.评估板MAX77650 EV电路图(3)

图9.评估板MAX77650 EV电路图(4)

图10.评估板MAX77650 EV电路图(5)

图11.评估板MAX77650 EV电路图(6)


图12.评估板MAX77650 EV PCB设计图(1)

图13.评估板MAX77650 EV PCB设计图(2)