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[原创] IntersilISL78693单颗锂电池充电完整解决方案

关键词:电源管理 电池充电器 SL78693

时间:2017-02-15 09:27:08       来源:中电网

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 trickle charge
• Guaranteed to operate down to 2.65V after start-up
• Ambient temperature range: -40°C to +85°C
• AEC-Q100 qualified

ISL78693应用:

• Automotive systems
• eCall systems
• Backup battery systems

图1. ISL78693框图

图2. ISL78693典型应用电路

评估板ISL78693EVAL1Z

The ISL78693EVAL1Z is a complete platform for the evaluation of all datasheet specifications and functionalities.
The onboard 8-bit DIP switch facilitates battery charge current programming, setting EN input, temperature monitoring status, etc. The four jumpers can set up the input source
selection, USB mode selection, and can be used to make other necessary connections.
The ISL78693EVAL1Z board is intended to provide an evaluation platform for the 3mmx3mm DFN ISL78693 package, single-cell Li-ion battery charger.
The device along with key components, constitute a complete charger solution demonstrating the space saving advantage of the ISL78693 in limited space applications.
LEDs connected to STATUS and FAULT pins will indicate the normal charging status or fault condition.
Onboard jumpers and a DIP switch allow the different operating conditions for the charger.

图3. 评估板ISL78693EVAL1Z外形图

评估板ISL78693EVAL1Z 主要特性:

• Complete charger for single-cell Li-ion batteries
• Integrated pass element and current sensor
• No external blocking diode required
• 1% voltage accuracy
• Programmable current limit up to 0.5A
• NTC thermistor interface for battery temperature monitor, 8-bit DIP switch for conveniently setting up charging current, battery thermal status, EN input, etc
• Different jumpers for input source selection, USB mode selection, and the convenience of current measurement
• Test points provided for STATUS, FAULT, TIME, EN, V2P8, and TEMP functional pins to allow for monitoring the device pins
• Board size 3.5"x2.5" for the convenience of evaluation
• Eight thermal vias in the thermal pad
• RoHS compliant

评估板ISL78693EVAL1Z 主要指标:

• Ambient temperature range, -40°C to +85°C
• Supply voltage, VIN = 4.3V to 5.5V
• Output voltage, VBAT = 3.65V
• Trickle charge voltage, 2.6V
• Recharge threshold voltage, 3.3V
• Constant charge current up to 0.5A

图4. 评估板ISL78693EVAL1Z连接图

图5. 评估板ISL78693EVAL1Z电路图

评估板ISL78693EVAL1Z材料清单:


图6. 评估板ISL78693EVAL1Z PCB设计图:顶层丝印图


图7. 评估板ISL78693EVAL1Z PCB设计图:顶层元件面

图8. 评估板ISL78693EVAL1Z PCB设计图:内部层2

图9. 评估板ISL78693EVAL1Z PCB设计图:内部层3

图10. 评估板ISL78693EVAL1Z PCB设计图:底层焊接面

图11. 评估板ISL78693EVAL1Z PCB设计图:底层丝印面
详情请见:
http://www.intersil.com/content/dam/Intersil/documents/isl7/isl78693.pdf

http://www.intersil.com/content/dam/Intersil/documents/isl7/isl78693eval1z-user-guide.pdf

isl78693.pdf

isl78693eval1z-user-guide.pdf

 

 

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