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)

TI (德州仪器)

德州仪器(Texas Instruments)，简称TI，是全球领先的半导体公司，为现实世界的信号处理提供创新的数字信号处理(DSP)及模拟器件技术。除半导体业务外，还提供包括传感与控制、教育产品和数字光源处理解决方案。TI总部位于美国德克萨斯州的达拉斯，并在25多个国家设有制造、设计或销售机构。

TI产品分类

1.数据转换器(Data Converter) IC -

①模数转换ICA/D - ADS、TLV、TLC、THS;

②数模转换ICD/A - DAC、TLV、TLC、THS;

③触摸屏控制器IC- TSC;

④ 音频编解码IC - PCM、TPA、TLV、TAS、DSD;

⑤ CCD控制器IC - VSP;

⑥模拟前端控制IC(超声波、x射线)- AFE;

⑦视频编解码器IC -TVP;

⑧ V/F和F/V转换器IC - VFC;

2.电源管理(Power Management) IC -

① 精密串联电压参考IC - REF;

② 并联电压参考IC - LM4040;

③ 电池管理IC、实时时钟IC、无线电源IC、非易失性RAM IC - BQ;

④ 电源模块 - DCx、PTx;

⑤ 功率Mosfet IC　- CSD;

⑥ PWM控制器 - UCC;

⑦ 数字功率IC PWM、MosFet控制器IC - UCD;

⑧ 马达PWM驱动器IC - DVR;

⑨ 一般电源管理IC - TPS;

3. 放大器(Amplifier)IC -

① 运算放大器IC - OPA、TLC、TLE、TLV ;

② 仪表/差分放大器IC - INA;

③ 对数放大器IC - LOG;

④ 可编程增益放大器IC - PGA;

4. 接口 (Interface) IC　-

① USB接口IC - TUSB;

② 1394接口IC - TSB;

③ CAN接口IC - SN65HVD23;

④ RS232接口IC - MAX232、GD232等;

⑤ RS485接口IC - SN65HVD;

⑥ SCSI接口IC - UCC56;

⑦ PCI接口IC - PCI、XIO;

⑧ RF、IF接口IC - CC、GC、TRF ;

⑨显示接口IC –TFP ;

⑩ 隔离器IC - ISO;

①① 串行解串IC - SLK、TLK;

①② UART接口IC - TL16;

5. 逻辑器件 (Logic)IC -触发器IC锁存器IC寄存器IC 缓冲器IC 驱动器IC 收发器IC - SN74/54系列IC、CD74系列IC等;

6. 处理器 (Processor)IC -

① DSP IC　- TMX320、TMS320;

② 超低耗微控制器IC - MSP430[2] 、LMxS;

③数据转换器片上系统IC – MSC等;

④ Arm Cortex A8/A9 - OMAP/AM35x/AM18x/AM17x;