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[原创] TI bq25703A I2C多种化学电池升压-降压充电控制方案

关键词:电源管理 电池充电器 bq25703A

时间:2017-08-02 09:49:38       作者:TI       来源:中电网

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.

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

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 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3.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.

图4.评估模块bq2570x EVM电路图
评估模块bq2570x EVM材料清单:




图5.评估模块bq2570x EVM PCB装配图(顶层)

图6.评估模块bq2570x EVM PCB装配图(底层)
详情请见:
http://www.ti.com/lit/ds/symlink/bq25703a.pdf
http://www.ti.com/lit/ug/sluubg6/sluubg6.pdf
bq25703a.pdf
sluubg6.pdf

 

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