Intersil ISL9301高压充电器方案

Intersil公司的 ISL9301是全集成的高输入电压的单节锂离子充电器,具有电源通路管理功能,给系统负载供电和对电池充电采用单独的通路. ISL9301充电器的输入电压可高达28V,充电电压精度高达1%,可以广泛应用于手机,蓝牙设备,PDA,MP3播放器,单独使用的充电器和其它的便携式设备.本文介绍了ISL9301的主要性能,方框图和典型应用电路以及ISL9301EVAL1Z评估板主要特性,详细电路图和所用材料清单(BOM).

High Input Voltage Charger With Power Path Management
The ISL9301 is a fully integrated high input voltage single-cell Li-ion battery charger with power path
management function. This charger performs the CC/CV charge function required by Li-ion batteries. The charger accepts an input voltage up to 28V but is disabled when the input voltage exceeds 10.5V OVP threshold. The 28V rating eliminates the overvoltage protection circuit required in a low-voltage charger. The charge current and the end-of-charge (EOC) current are programmable with external resistors. When the battery voltage is lower than 2.8V, the charger preconditions the battery with 16% of the programmed charge current. When the charge current reduces to the programmable EOC current level during the CV charge phase, the EOC indicator (CHG) will toggle to logic LOW to indicate the end-of-charge condition. The charger will continue to charge until the user programmed timeout interval has elapsed, then the charger is terminated.
The ISL9301 uses separate power paths to supply the system load and charge the battery. This feature allows the system to immediately operate with a completely discharged battery. This feature also allows the charge to terminate when the battery is full while continuing to supply the system with the input source, thus minimizing unnecessary charge/discharge cycles and improving the battery life.
Two indication pins (PPR and CHG) allow simple interface to a microprocessor or LEDs.



图1. ISL9301外形图
ISL9301主要特性:
Complete Charger for Single-Cell Li-ion/Polymer Batteries
Power Path Management Optimize Charge and System Currents
Intelligent Timeout Interval Based on Actual Charge Current
Integrated Disconnect Switch to Disconnect the Battery
1% Charger Output Voltage Accuracy
Programmable Charge Current
Programmable End-of-Charge Current
Charge Current Thermal Foldback for Thermal Protection
Trickle Charge for Fully Discharged Batteries
28V Maximum Voltage at VIN pin
Power Presence and Charge Indications
Ambient Temperature Range: -40°C to +85°C
10 Ld 3x3 DFN Package
Pb-Free (RoHS Compliant)
ISL9301主要应用:
Mobile Phones
Blue-Tooth Devices
PDAs
MP3 Players
Stand-Alone Chargers
Other Handheld Devices



图2. ISL9301方框图



图3. ISL9301典型应用电路

ISL9301的详情请见:
http://www.intersil.com/data/fn/fn6435.pdf
ISL9301EVAL1Z评估板
The ISL9301EVAL1Z is an evaluation tool for the ISL9301 single-cell Li-ion battery charger. The evaluation tool provides a complete evaluation platform addressing all
datasheet specifications and functionality. The jumpers on the board facilitate the programming of the charge current, different charging conditions, and can be used to make other necessary connections, such as current measurement.
The ISL9301 is a Li-ion battery charger with power path management function. It uses separate power paths to supply the system load and charge the battery. This feature
allows the system to immediately operate with a completely discharged battery. This feature also allows the charge to terminate when the battery is full while continuing to supply the system with the input source, thus minimizes unnecessary charge/discharge cycles and improves the battery life.
The ISL9301 accepts input voltages ranging from 4.5V up to 28V. Due to the high voltage capability, the components associated with the input circuit on the evaluation board are
good for a 28V supply.
The components assembled in the center square constitute a complete charger, indicating the space saving advantage of the typical ISL9301 installation in space-limited
applications.
ISL9301EVAL1Z评估板主要特性:

Complete Charger for Single-Cell Li-ion/Polymer Batteries
Power Path Management Optimize Charge and System Currents
Intelligent Timeout Interval Based On Actual Charge Current
Integrated Disconnect Switch to Disconnect the Battery
30mV (target) Voltage Accuracy
Programmable Charge Current
Programmable End-of-Charge Current
Charge Current Thermal Foldback for Thermal Protection
Trickle Charge for Fully Discharged Batteries
28V Maximum Voltage at VIN pin
Power Presence and Charge Indications
Ambient Temperature Range: -40°C to +85°C
3x3 10 Ld DFN Package




图4. ISL9301EVAL1Z评估板连接方框图




图5. ISL9301EVAL1Z评估板电路图
ISL9301EVAL1Z 材料清单(BOM):