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1、TI bq25703A I2C多种化学电池升压降压充电控制器解决方案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
2、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 chargi
3、ng 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 supplemen
4、t 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
5、 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, th
6、e 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.bq25703A主要特性:Charge 1- to 4-Cell Battery From Wide Range of Input Sources3.5-V to 2
7、4-V Input Operating VoltageSupports USB2.0, USB 3.0, USB 3.1 (Type C), and USB_PD Input Current SettingsSeamless Transition Between Buck and Boost OperationInput Current and Voltage Regulation (IDPM and VDPM) Against Source OverloadPower/Current Monitor for CPU ThrottlingComprehensive PROCHOT Profil
8、e, IMVP8 CompliantInput and Battery Current MonitorSystem Power Monitor, IMVP8 CompliantNarrow-VDC (NVDC) Power Path ManagementInstant-On With No Battery or Deeply Discharged BatteryBattery Supplements System When Adapter is Fully-LoadedIdeal Diode Operation in Supplement ModePower Up USB Port From
9、Battery (USB OTG)Output 4.48-V to 20.8-V Compatible With USB PDOutput Current Limit up to 6.35 A800-kHz or 1.2-MHz Programmable Switching frequency for 1-H to 2.2-H Low Profile InductorHost Control Interface for Flexible System ConfigurationI2C (bq25703A) Port for Optimal System Performance and Stat
10、us ReportingHardware Pin to Set Input Current Limit Without EC ControlHigh Accuracy Regulation and Monitor0.5% Charge Voltage Regulation2% Input/Charge Current Regulation2% Input/Charge Current Monitor5% Power MonitorSafetyThermal ShutdownInput, System, Battery Overvoltage ProtectionMOSFET Inductor
11、Overcurrent ProtectionLow Battery Quiescent CurrentInput Current Optimizer (ICO) to Extract Max Input PowerCharge Any Battery Chemistry: Li+, LiFePO4, NiCd, NiMH, Lead AcidPackage: 32-Pin 4 4 WQFNbq25703A应用: Drones, Bluetooth Speakers, IP Cameras,Detachable, and Tablet PCs and Power Bank Industrial
12、and Medical Equipment Portable Equipment With Rechargeable Batteries图1.bq25703A功能框图图2. bq25703A典型应用电路图评估模块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 betw
13、een 3.5 V and 24 V, with a programmableoutput of 14 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 eva
14、luating 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 co
15、mponentcount, 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
16、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.Dur
17、ing 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.