TI bq24150x单电池充电解决方案

TI 公司的bq24150x是紧凑的灵活高效USB友好的单电池开关模式充电管理器件,它的充电参数可通过I2C接口进行编程. bq24150/1集成了同步PWM控制器,功率MOSFET,输入电流检测,高精度电流和电压调节,以及充电终止. bq24150/1的充电模式有三种:连续充电,恒流充电和恒压充电.输入电压最大为6V,充电电压为3.5 V 到4.44 V,广泛用在手机和智能手机,MP3播放器和手持设备.本文介绍了bq24150x的主要特性, 充电模式功能方框图和升压模式方框图, 典型应用电路以及单颗电池充电器应用电路, bq2415x评估模块电路图和材料清单(B)M).

The bq24150/1 is a compact, flexible, high-efficiency, USB-friendly switch-mode charge management device for single-cell Li-ion and Li-polymer batteries used in a wide range of portable applications. The charge parameters can be programmed through an I2C interface. The bq24150/1 integrates a synchronous PWM controller, power MOSFETs, input current sensing, high-accuracy current and voltage regulation, and charge termination, into a small WCSP package.

The bq24150/1 charges the battery in three phases: conditioning, constant current and constant voltage. The input current is automatically limited to the value set by the host. Charge is terminated based on user-selectable minimum current level. A safety timer with reset control provides a safety backup for I2C interface. During normal operation, bq24150/1 automatically restarts the charge cycle if the battery voltage falls below an internal threshold and automatically enters sleep mode or high impedance mode when the input supply is removed. The charge status is reported to the host using the I2C interface.

During the charging process, the bq24150/1 monitors its junction temperature (TJ) and reduces the charge current once TJ increases to approximately 125°C. To support USB OTG device, bq24150/1 provides VBUS (approximately 5.05 V) by boosting the battery voltage. The bq24150/1 is available in 20-pin WCSP package.

主要特性:
Charge Faster than Linear Chargers
High-Accuracy Voltage and Current Regulation
Input Current Regulation Accuracy: ±5% (100 mA and 500 mA)
Charge Voltage Regulation Accuracy: ±0.5% (25°C), ±1% (0°C to 125°C)
Charge Current Regulation Accuracy: ±5%
High-Efficiency Mini-USB/AC Battery Charger for Single-Cell Li-Ion and Li-Polymer Battery Packs
20-V Absolute Maximum Input Voltage Rating
6-V Maximum Operating Input Voltage
Built-In Input Current Sensing and Limiting
Integrated Power FETs for Up To 1.25-A Charge Rate
Programmable Charge Parameters through I2C Interface (up to 3.4 Mbps):
Input Current
Fast-Charge/Termination Current
Charge Voltage (3.5 V to 4.44 V)
Safety Timer
Termination Enable
Synchronous Fixed-Frequency PWM Controller Operating at 3 MHz With 0% to 99.5% Duty Cycle
Automatic High Impedance Mode for Low Power Consumption
Safety Timer with Reset Control
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 — bq24150
Automatic High Impedance Mode — bq24151
Boost Mode Operation for USB OTG:
Input Voltage Range (from Battery): 2.5 V to 4.5 V
Output Voltage for VBUS: 5.05 V
1.976 x 1.924mm 20-Pin WCSP Package

应用:
Mobile and Smart Phones
MP3 Players
Handheld Devices



图1.bq24150/1功能方框图(充电模式)



图2.bq24150/1功能方框图(升压模式)



图3. bq24150/1典型应用电路



图4.I2C控制单颗电池充电器应用电路



图5.I2C控制单颗电池预稳压应用电路
bq2415x评估模块
The bq2415x evaluation module is a complete charger module for evaluating compact, flexible, high-efficiency, USB-friendly switch-mode charge management solution for single-cell Li-ion and Li-polymer batteries used in a wide range of portable applications.

The bq2415x integrates a synchronous PWM controller, power MOSFETs, input current sensing, high-accuracy current and voltage regulation, and charge termination, into a small WCSP package.

The charge parameters can be programmed through an I2C interface.

评估模块EVM特性:
Evaluation Module For BQ2415x
High Efficiency Fully Integrated NMOS-NMOS Synchronous Buck Charger With 3MHz Frequency
Integrated Power FETs for Up To 1.25-A Charge Rate
Programmable Battery Voltage, Charge Current, and Input Current via I2C Interface
Input Operating Range 4 V–6 V
Boost Mode Operation for USB OTG
LED Indication for Status Signals
Test Points for Key Signals Available for Testing Purpose. Easy Probe Hook-up
Jumpers Available. Easy to Change Connections.



图6. bq2415x评估模块电路图
bq2415x评估模块材料清单(BOM):