RT9505是一款完整的单节锂离子电池采用恒定电流/恒定电压线性充电器。较少的外部元件数目使得RT9505成为便携式应用的理想选择。RT9505可以适合USB电源和适配器电源工作。由于采用了内部PMOSFET架构，加上防倒充电路，所以不需要外部隔离二极管。热反馈可对充电电流进行自动调节，以便在大功率操作或高环境温度条件下对芯片温度加以限制。充电电压固定于4.2V，而充电电流可通过一个电阻器进行外部设置。当充电电流在达到最终浮充电压之后降至设定值1/10时，RT9505将自动终止充电循环。当输入电压（交流适配器或USB电源）被拿掉时，RT9505自动进入一个低电流状态，将电池漏电流降至2uA以下。RT9505的其他特点包括电池温度检测、欠压闭锁、自动再充电和两个用于指示充电、结束的LED状态引脚。

RT9505 特点
1、高达18V输入电压
2、无需MOSFET、检测电阻器或隔离二极管
3、用于单节锂离子电池、采用TDFN-10封装的完整线性充电器
4、恒定电流/恒定电压操作，并具有可在无过热危险的情况下实现充电速率最大化的热调节功能
5、精度达到±1%的4.2V预设充电电压
6、用于电池电量检测的充电电流监控器输出
7、自动再充电
8、充电状态双输出、无电池和故障状态显示
9、C/10充电终止
10、2.9V涓流充电
11、软启动限制了浪涌电流
12、电池温度监测功能
13、采用TDFN-10封装

RT9505 应用
·移动电话、PDA
·MP3、MP4播放器
·数码相机
·电子词典
·GPS
·便携式设备、各种充电器

The RT9505 is a fully integrated low cost single-cell Li-Ion battery charger IC ideal for portable applications. The RT9505 is capable of being powered up from AC adapter.The RT9505 enters sleep mode when AC adapter is removed.
The RT9505 optimizes the charging task by using a control algorithm including preconditioning mode, fast charge mode and constant voltage mode. The charging task is terminated as the charge current drops below the preset threshold. The AC adapter charge current can be programmed up to 1A with an external resister. The internal thermal feedback circuitry regulates the die temperature to optimize the charge rate for all ambient temperatures.
The RT9505 features 18V maximum rating voltages for AC adapter. The other features are under voltage protection, over voltage protection for AC adapter supply and battery temperature monitoring.

RT9505 Features
RT9505 18V Maximum Rating for AC Adapter
RT9505 Internal Integrate P-MOSFETs
RT9505 AC Adapter Power Good Status Indicator
RT9505 Charge Status Indicator
RT9505 Under Voltage Protection
RT9505 Over Voltage Protection
RT9505 Automatic Recharge Feature
RT9505 Battery Temperature Monitoring
RT9505 Small 10-Lead WDFN Package
RT9505 Thermal Feedback Optimizing Charge Rate
RT9505 RoHS Compliant and 100% Lead (Pb)-Free

RT9505 Applications
Digital Cameras
Cellular Phones
Personal Data Assistants (PDAs)
MP3 Players
Hand Held PCs