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基于TI公司的bq25120可穿戴和IoT电池充电器解决方案

来源: 中电网
2019-01-24
类别:电源管理
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文章创建人 拍明

原标题:TI bq25120可穿戴和IoT电池充电器解决方案

  TI公司的bq25120是高度集成电池充电管理集成电路,包括用于可穿戴设备的线性充电器,稳压输出,负载开关,带定时器的人工重置以及电池电压监视器,工作电压高达4.65 V,主要用在智能手表和其它可穿戴设备,健身设备附件,健康监测附件以及可充电玩具.本文介绍了bq25120主要特性,框图和应用电路,以及评估板bq25120EVM-731主要特性,电路图,材料清单和PCB设计文件图.

  The bq25120 is a highly integrated battery charge management IC that integrates the most common functions for wearable devices: Linear charger, regulated output, load switch, manual reset with timer, and battery voltage monitor. The integrated buck converter is a high efficiency, low IQ switcher using DCS control that extends light load efficiency down to 10-µA load currents.The low quiescent current during operation and shutdown enables maximum battery life. The device supports charge currents from 5 mA to 300 mA. The input current limit, charge current, buck converter output voltage, LDO output voltage, and other parameters are programmable through the I2C interface.

  The battery is charged using a standard Li-Ion charge profile with three phases: precharge, constant current and constant voltage. A voltage-based JEITA compatible battery pack thermistor monitoring input (TS) is included that monitors battery temperature and automatically changes charge parameters to prevent the battery from charging outside of its safe temperature range. The charger is optimized for 5-V USB input, with 20-V tolerance to withstand line transients. The buck converter is run from the input or battery. When in battery only mode, the device can run from a battery up to 4.65 V.

  A configurable load switch allows system optimization by disconnecting infrequently used devices. The manual reset with timer allows mutliple different configuration options for wake are reset optimization. A simple voltage based monitor provides battery level information to the host in 2% increments from 60% to 100% of the programmed V(BATREG).

  bq25120主要特性:

  Increases System Operation Time Between Charges

  Configurable 300-mA Buck Regulator (1.8-V Default)

  700 nA (typical) Iq with Buck Converter Enabled (No Load)

  Configurable Load Switch or 100mA LDO Output (Load Switch by Default)

  Up to 300-mA Charge Current for Fast Charging

  0.5% Accurate Battery Voltage Regulation (Configurable from 3.6 V to 4.65 V in 10-mV Steps)

  Configurable Termination Current Down to 500 µA

  Simple Voltage Based Battery Monitor

  Highly Integrated Solution with Small Footprint

  2.5 mm × 2.5 mm WCSP Package and 6 External Components for Minimal Solution

  Push-Button Wake-Up and Reset with Adjustable Timers

  Power Path Management for Powering the

  System and Charging the Battery

  Power Path Management enables <50 nA Ship Mode Battery Quiescent Current for Longest Shelf Life

  Battery Charger Operates from 3.4 V – 5.5 VIN (5.5-V OVP / 20-V Tolerant)

  Dedicated Pins for Input Current Limit, Charge Current, Termination Current, and Status Output

  I2C Communication Control

  Charge Voltage and Current

  Termination Threshold

  Input Current Limit

  VINDPM Threshold

  Timer Options

  Load Switch Control

  Controls for Interrupts for Faults and Status

  System Output Voltage Adjustment

  LDO Output Voltage Adjustment

  bq25120应用:

  Smart Watches and other Wearable Devices

  Fitness Accessories

  Health Monitoring Medical Accessories

  Rechargeable Toys

  图1.bq25120功能框图

  图2.bq25120应用电路图

  评估板bq25120EVM-731

  The bq25120EVM-731 evaluation module is a highly integrated battery charge management IC that integrates the most common functions for wearables devices: Linear charger, regulated output, load switch, manual reset with timer, and battery voltage monitor. The low quiescent current during operation and shutdown enables amaximum battery life. The device supports charge currents from 5 mA to 300 mA. The input current limit, charge current, PWM output voltage, LDO output voltage, and other parameters are programmable through the I2C interface. The battery is charged using a standard Li-Ion charge profile with three phases: precharge, constant current and constant voltage.

  The bq25120 EVM on PWR731 PCB is a complete battery power management module for evaluatingcompact, highly-integrated, flexible, high efficiency, linear charging solution for single cell, Li-Ion and Li-Polymer battery-powered systems used in wearables and low-power portable applications.

  评估板bq25120EVM-731主要特性:

  • Configurable 300-mA buck regulator (1.8-V default)

  • 700-nA typical IQ with PWM enabled

  • 0.5% accurate battery voltage regulation (configurable from 3.6 V to 4.65 V in 10-mV steps)

  • Configurable termination current down to 500 μA

  • 2.5 mm × 2.5 mm WCSP package and 6 external components for minimum solution

  • Power path management for powering the system and charging the battery

  • Power path management enables < 150 nA ship mode battery quiescent current for longest shelf life

  • Push-button wake-up and reset with adjustable timers

  • Battery charger operates from 3.4 V – 5.5 V VIN (5.5-V OVP / 20-V tolerant)

  • I2C control of key parameters

  图3.评估板bq25120EVM-731外形图

  评估板bq25120EVM-731材料清单:



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