IntersilISL78693单颗锂电池充电完整解决方案

Intersil公司的ISL78693是输入电压低至2.65V的单颗锂电池充电器,能和各种的AC适配器或USB端口配合工作.器件集成了功率晶体管和电流传感器,反向漏电流700nA,1%初始电压精度,可编CC电流高达1A, AEC-Q100 认证,主要用在汽车系统,eCall系统和电池备份系统.本文介绍了ISL78693主要特性,框图和应用电路,以及评估板ISL78693EVAL1Z特性和指标,电路图,材料清单和PCB设计图.
The ISL78693 is an integrated single-cell Li-ion or Li-polymer battery charger capable of operating with an input voltage as low as 2.65V (cold crank case). This charger is designed to work with various types of AC adapters or a USB port.
The ISL78693 operates as a linear charger when the AC adapter is a voltage source. The battery is charged in a Constant Current/Constant Voltage (CC/CV) profile. The charge current is programmable with an external resistor up to 1A.
The ISL78693 can also work with a current-limited adapter to minimize the thermal dissipation.
The ISL78693 features charge current thermal foldback to ensure safe operation when the printed circuit board’s thermal dissipation is limited due to space constraints. Additional features include preconditioning of an over-discharged battery, an NTC thermistor interface for charging the battery in a safe temperature range, and automatic recharge. The device is specified for operation in ambient temperatures from -40°C to
+85°C and is offered in a 3x3mm thermally enhanced DFN package.
ISL78693主要特性:

• Complete charger for single-cell Lithium chemistry batteries
• Integrated power transistor and current sensor
• Reverse battery leakage 700nA
• 1% initial voltage accuracy
• Programmable CC current up to 1A
• Charge current thermal foldback
• NTC thermistor interface for battery temperature alert
• Accepts CV and CC types of adapters or USB bus power
• Preconditioning trick...