TI的bq24610锂离子电池开关模式充电控制原理及解决方案

TI 公司的bq24610/7是高度集成锂离子或离聚合体电池开关模式充电控制器,有固定频率的同步开关PWM控制器,高精度充电电流(±3%)和电压调整(±0.5%),充电预设置,充电终止,适配器电流调整和充电状态监视.输入电压从5V-28V/24V,充电电流高达10A.本文介绍bq24610/7主要特性,功能方框图,典型应用电路,输入滤波器以及评估板EVM主要特性,电路图和材料清单.

The bq24610/7 is highly integrated Li-ion or Li-polymer switch-mode battery charge controller. It offers a constant-frequency synchronous switching PWM controller with high accuracy charge current and voltage regulaTIon, charge precondiTIoning, termination, adapter current regulation and charge status monitoring.

The bq24610/7 charges the battery in three phases: preconditioning, constant current, and constant voltage. Charge is terminated when the current reaches a minimum user-selectable level. A programmable charge timer provides a safety backup. The bq24610/7 automatically restarts the charge cycle if the battery voltage falls below an internal threshold, and enters a low-quiescent current sleep mode when the input voltage falls below the battery voltage.

bq24610/7主要特性:

600 kHz NMOS-NMOS Synchronous Buck Converter

Stand-alone Charger Support for Li-Ion or Li-Polymer

5V–28V VCC Input Operating Range and Support 1-6 Battery Cells (bq24610)

5V–24V VCC Input Operating Range and Support 1-5 Battery Cells (bq24617)

Up to 10A Charge Current and Adapter Current

High-Accuracy Voltage and Current Regulation

±0.5% Charge Voltage Accuracy

±3% Charge Current Accuracy

±3% Adapter Current Accuracy

Automatic System Power Selection from Adapter or Battery

Internal Loop Compensation

Internal Soft Start

Dynamic Power Management

Safety Protection

Input Over-Voltage Protection

Battery Thermistor Sense Hot/Cold Charge Suspend

Battery Detection

Reverse Protection Input FET

Programmable Safety Timer

图1.bq24610/7功能方框图


图2.bq24610/7典型应用电路图

图3.bq24610/7输入滤波器

评估板EVM主要特性:

• Evaluation Module For bq2461x/bq2463x

• High Efficiency Synchronous Buck Charger

• User-programmable up to 26V Battery Voltage

• AC Adapter Operating Range 5 V–28 V

• LED Indication for Control and Status Signals.

• Test Points for Key Signals Available for Testing Purpose. Easy Probe Hook-up.

• Jumpers Available. Easy to Change Connections.


图4.bq2461x/bq2463x EVM电路图

评估板EVM材料清单(BOM):