Texas Instruments bq24157S 开关模式单节锂离子电池充电器集成电路

德州仪器 bq24157S 开关模式单节锂离子电池充电器集成电路是一款紧凑、灵活、高效、支持 USB 开关模式充电管理的器件，用于各种便携式应用中所用的单节锂离子和锂聚合物电池。充电参数的编程是通过一个 I²C 接口实现。该集成电路在一个小型 DSBGA 封装内集成了同步 PWM 控制器、功率 MOSFET、输入电流感应、高准确电流和电压调节器、及充电终止功能。该集成电路的电池充电分为三个阶段：调节、恒流、恒压。输入电流自动限制在主机设定的值。根据电池电压和用户可选择的最低电流来终止充电。一个带有复位控制的安全定时器为 I²C 接口。

特性

Integrated Power FETs for up to 1.55A Charge Rate
Spread Spectrum Frequency Control for Improved EMI Performance
High-Accuracy Voltage and Current Regulation
- Input Current Regulation Accuracy: ±5% (100mA and 500mA)
- Charge Voltage Regulation Accuracy: ±0.5% (25°C), ±1% (0°C to 125°)
- Charge Current Regulation Accuracy: °5%
Factory Test-Mode for GSM Calibration Without a Battery
Input Voltage Based Dynamic Power Management (V_IN DPM)
Bad Adaptor Detection and Rejection
Safety Limit Register for Maximum Charge Voltage and Current Limiting
Programmable Charge Parameters through I²C Compatible Interface (up to 3.4Mbps)
- Input Current Limit
- V_IN DPM Threshold
- Fast-Charge/Termination Current
- Charge Regulation Voltage (3.5 to 4.44V)
- Low Charge Current Mode Enable/Disable
- Safety Timer with Reset Control
- Termination Enable/Disable

High-Efficiency Mini-USB/AC Battery Charger for Single-Cell Li-Ion and Li-Polymer Battery Packs
20V Absolute Maximum Input Voltage Rating
6.5V Maximum Operating Input Voltage
Synchronous Fixed-Frequency PWM Controller Operating at 3MHz With 0% to 99.5% Duty Cycle
Automatic High Impedance Mode for Low Power Consumption
Robust Protection
- Reverse Leakage Protection Prevents Battery Drainage
- Thermal Regulation and Protection
- Input/Output Overvoltage Protection
Status Output for Charging and Faults
USB Friendly Boot-Up Sequence
Automatic Charging
Power Up System Without Battery
Boost Mode Operation for USB OTG
- Input Voltage Range (from Battery): 3.2 to 4.5V
- Output for V_BUS: 5.05 , 350mA
2.25 × 2.65mm, 20-Pin DSBGA Package
Pin-to-Pin Compatible With bq24157 and bq24158