原标题：TI bq25703A I2C多种化学电池升压-降压充电控制方案

　　TI公司的bq25703A是带有系统电源监视器和处理器热监视器的I2C多种化学电池升压-降压充电控制器,具有低元件数量和高效率的优势,可从各种输入源对1-4颗电池充电,输入电压3.5V-24V,支持USB2.0, USB 3.0, USB 3.1 (Type C)和USB_PD输入电流设定,降压和升压工作无缝转换.输出电流高达6.35A,可编程开关频率800kHz或1.2MHz,充电电压±0.5%,输入/充电电流±2%,输入/充电电流监视±2%,电源监视±5%.主要用在无人机,蓝牙扬声器, IP照相机,可拆电源,平板电脑和电源组,工业和医疗设备和带可充电电池的手持设备.本文介绍了bq25703A主要特性,功能框图,典型应用电路图以及评估模块bq2570x EVM (bq25700AEVM-732和bq25703AEVM-732)主要特性,电路图,材料清单和PCB装配图.

　　The bq25703A is a synchronous NVDC battery buck-boost charge controller, offering low component count, high efficiency solution for space-constraint, multi-chemistry battery charging applications.

　　The NVDC-1 configuration allows the system to be regulated at battery voltage, but not drop below system minimum voltage. The system keeps operating even when the battery is completely discharged or removed. When load power exceeds input source rating, the battery goes into supplement mode and prevents the input source from being overloaded.

　　The bq25703A charges battery from a wide range of input sources including USB adapter, high voltage USB PD sources and traditional adapters.During power up, the charger sets converter to buck, boost or buck-boost configuration based on input source and battery conditions. The charger automatically transits among buck, boost and buck-boost configuration without host control.

　　In the absence of an input source, the bq25703A supports On-the-Go (OTG) function from 1- to 4-cell battery to generate 4.48 V to 20.8 V on VBUS. During OTG mode, the charger regulates output voltage and output current.

　　The bq25703A monitors adapter current, battery current and system power. The flexibly programmed PROCHOT output goes directly to CPU for throttle back when needed.

　　描述

　　bq25703A 是一种同步 NVDC 电池降压/升压充电控制器，为空间受限的多化合物电池充电应用提供了组件数量少的高效 解决方案。

　　NVDC-1 配置可将系统电压稳定在电池电压范围内，但不会低于系统最小电压。即便在电池完全放电或被取出时，系统也仍会继续工作。当负载功率超过输入源额定值时，电池会进入补电模式并防止系统崩溃。

　　The bq25703A 从 USB 适配器、高电压 USB PD 源和传统适配器等各种输入源为电池充电。

　　在加电期间，充电器基于输入源和电池状况，将转换器设置为降压、升压或降压/升压配置。充电器自动在降压、升压、降压/升压配置间转换，无需主机控制。

　　在无输入源的情况下，bq25703A 可通过 1 到 4 节电池支持 On-the-Go (OTG) 功能，从而在 VBUS 上生成 4.48V 至 20.8V 电压。在 OTG 模式下，充电器调节输出电压和输出电流。

　　bq25703A 可监控适配器电流、电池电流和系统功率。灵活编程的 PROCHOT 输出直达 CPU，可根据需要降低其频率。

　　特性

　　从各种输入源为 1 至 4 节电池充电

　　3.5V 至 24V 输入工作电压

　　支持 USB 2.0、USB 3.0、USB 3.1 (Type-C) 和 USB_PD 输入电流设置

　　在降压和升压操作之间进行无缝转换

　　提供输入电流和电压调节(IDPM 和 VDPM)以防电源过载

　　用于 CPU 节流的功率/电流监控器

　　综合 PROCHOT 设置，符合 IMVP8

　　输入和电池电流监控器

　　系统功率监控器，符合 IMVP8

　　窄 VDC (NVDC) 电源路径管理

　　无需电池或使用深度放电的电池亦可瞬时启动

　　适配器满载时，电池可为系统补充电量

　　从电池给 USB 端口加电 (USB OTG)

　　输出 4.48V 至 20.8V 与 USB PD 兼容

　　输出电流限制高达 6.35A

　　用于 1µH 至 3.3µH 电感器的 800kHz 或 1.2MHz 可编程开关频率

　　可通过主机控制接口实现灵活系统配置

　　I2C (bq25703A) 端口用于优化系统性能和状态报告

　　硬件引脚可用于设置输入电流限制，无需 EC 控制

　　集成型 ADC 可监控电压、电流和功率

　　高精度调节和监控

　　±0.5% 充电电压调节

　　±2% 输入/充电电流调节

　　±2% 输入/充电电流监控

　　±5% 功率监控器

　　安全性

　　热关断

　　输入、系统、电池过电压保护

　　MOSFET 电感过流保护

　　低电池静态电流

　　输入电流优化器 (ICO) 可获取最大输入功率

　　为任意化学电池充电：Li+、LiFePO4、镍镉、镍氢、铅酸

　　封装：32 引脚 4 x 4 WQFN

　　bq25703A主要特性:

　　Charge 1- to 4-Cell Battery From Wide Range of Input Sources

　　3.5-V to 24-V Input Operating Voltage

　　Supports USB2.0, USB 3.0, USB 3.1 (Type C), and USB_PD Input Current Settings

　　Seamless Transition Between Buck and Boost Operation

　　Input Current and Voltage Regulation (IDPM and VDPM) Against Source Overload

　　Power/Current Monitor for CPU Throttling

　　Comprehensive PROCHOT Profile, IMVP8 Compliant

　　Input and Battery Current Monitor

　　System Power Monitor, IMVP8 Compliant

　　Narrow-VDC (NVDC) Power Path Management

　　Instant-On With No Battery or Deeply Discharged Battery

　　Battery Supplements System When Adapter is Fully-Loaded

　　Ideal Diode Operation in Supplement Mode

　　Power Up USB Port From Battery (USB OTG)

　　Output 4.48-V to 20.8-V Compatible With USB PD

　　Output Current Limit up to 6.35 A

　　800-kHz or 1.2-MHz Programmable Switching frequency for 1-µH to 2.2-µH Low Profile Inductor

　　Host Control Interface for Flexible System Configuration

　　I2C (bq25703A) Port for Optimal System Performance and Status Reporting

　　Hardware Pin to Set Input Current Limit Without EC Control

　　High Accuracy Regulation and Monitor

　　±0.5% Charge Voltage Regulation

　　±2% Input/Charge Current Regulation

　　±2% Input/Charge Current Monitor

　　±5% Power Monitor

　　Safety

　　Thermal Shutdown

　　Input, System, Battery Overvoltage Protection

　　MOSFET Inductor Overcurrent Protection

　　Low Battery Quiescent Current

　　Input Current Optimizer (ICO) to Extract Max Input Power

　　Charge Any Battery Chemistry: Li+, LiFePO4, NiCd, NiMH, Lead Acid

　　Package: 32-Pin 4 × 4 WQFN

　　bq25703A应用:

　　• Drones, Bluetooth Speakers, IP Cameras,Detachable, and Tablet PCs and Power Bank

　　• Industrial and Medical Equipment

　　• Portable Equipment With Rechargeable Batteries

　　评估模块bq2570x EVM(bq25700AEVM-732和bq25703AEVM-732)

　　The bq25700AEVM-732 and bq25703AEVM-732 evaluation modules (EVM) are SMBus or I2C-controlledNVDC-1 buck boost charger. The input voltage range is between 3.5 V and 24 V, with a programmableoutput of 1–4 cells and a charge output current range of 64 mA to 8.128 A. This EVM does not include theEV2400 interface device; the EV2400 must be ordered separately to evaluate the bq2570x EVM.

　　The bq2570x evaluation modules are complete charger modules for evaluating an SMBUS or I2Ccontrolledbuck boost charge using the bq2570x devices.The bq2570x EVM does not include the EV2400 interface board. To evaluate the bq2570x EVM, order anEV2400 interface board separately.

　　The bq2570x is a synchronous NVDC-1 battery buck boost charge controller, offering a low componentcount, high efficiency solution for space-constrained, multi-chemistry battery charging applications.

　　The NVDC-1 configuration allows the system to be regulated at the battery voltage, but not drop below thesystem minimum voltage. The system keeps operating even when the battery is completely discharged orremoved. When load power exceeds the input source rating, the battery supplement mode prevents theinput source from being overloaded.The bq2570x charges the battery from a wide range of input sources including a 5-V USB adapter to ahigh-voltage USB PD source and traditional adapters.

　　During power up, the charger sets the converter to buck, boost, or buck-boost configuration based on theinput source and battery conditions. During the charging cycle, the charger automatically transits amongbuck, boost, and buck-boost configuration without host control.

　　The bq2570x monitors adapter current, battery current, and system power. The flexibly programmedPROCHOT output goes directly to the CPU for throttle back, when needed.

　　图.评估模块bq2570x EVM外形图

　　评估模块bq2570x EVM主要特性:

　　• Evaluation module for the bq2570x devices

　　• Supports 3.5- to 24-V input source

　　– 3.5- to 24-V, 0- to 6-A input operating range and 1–4 cell battery configuration

　　– Supports USB2.0, USB 3.0, USB 3.1 (USB Type-C™) and USB_PD

　　– Supports USB OTG with 4.48- to 20.8-V adjustable output

　　– Maximum Power Tracking by Input Voltage and Current Regulation

　　• Narrow VDC (NVDC) power path management

　　– Instant-on works with no battery or deeply discharged battery (PG1.0 needs charge-enablecommand)

　　– Battery supplements system when adapter is fully-loaded

　　• 800-kHz or 1.2-MHz switching frequency for low profile inductor

　　• SMBus (bq25700A) or I2C (bq25703A) port for optimal system performance and status reporting

　　• Power and Current Monitor for CPU Throttling

　　• Safety

　　– Thermal shutdown

　　– Input and system overvoltage protection

　　– MOSFET overcurrent protection

　　• Accelerate charge time by battery path impedance compensation

　　• Charge status outputs for LED or host processor

　　• Maximum power tracking capability by input voltage regulation

　　• Test points for key signals available for testing purposes. Easy probe hook-up.

　　• Jumpers available. Easy-to-change connections.

　　评估模块bq2570x EVM材料清单:

　　详情请见:

sluubg6.pdf

bq25703a.pdf