Maxim公司的MAX77650/MAX77651是用于低功耗可穿戴的高度集成電池充電和電源解決方案,具有SIMO降壓-升壓穩壓器,有三個輸出,可編電壓穩壓從3.6-4.6V,可編端電流0.375-45mA,主要用在藍牙耳機,健身和活動監視器,可提設備和物聯網(IoT).本文介紹了MAX7765優勢和主要特性,功能框圖和應用電路,以及MAX77650/MAX77651評估板EVK主要特性,元件分布圖,電路圖,材料清單和PCB設計圖.

The MAX77650/MAX77651 provide highly-integrated bat-tery 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 configu-rable 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 bidi-rectional I2C interface allows for configuring and check-ing 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.

MAX7765優勢和主要特性:

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)

MAX7765應用:

Bluetooth Headphones/Hearables
Fitness, Health, and Activity Monitors
Portable Devices
Internet of Things (IoT)

圖1.MAX7765簡化功能框圖

圖2.MAX7765典型應用電路圖

MAX77650/MAX77651評估板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 regu-lator, 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 resis-tive dividers at the SIMO outputs. The MAX77650/ MAX77651 devices themselves have different output volt-age ranges for the SIMO buck-boost regulator. Consult the device data sheet for more information.

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

MAX77650/MAX77651評估板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

圖3.MAX77650評估板EVK外形圖

圖4.MAX77650評估板EVK頂層元件分布圖

圖5.MAX77650評估板EVK底層元件分布圖

圖6.MAX77650評估板EVK電路圖(1)

圖7.MAX77650評估板EVK電路圖(2)

圖8.MAX77650評估板EVK電路圖(3)

圖9.MAX77650評估板EVK電路圖(4)

圖10.MAX77650評估板EVK電路圖(5)
MAX77650評估板EVK材料清單(BOM):

圖11.MAX77650評估板EVK PCB設計圖(1)

圖12.MAX77650評估板EVK PCB設計圖(2)

圖13.MAX77650評估板EVK PCB設計圖(3)

圖14.MAX77650評估板EVK PCB設計圖(4)

圖15.MAX77650評估板EVK PCB設計圖(5)

圖16.MAX77650評估板EVK PCB設計圖(6)