APL5317低压差线性稳压IC，APL5317操作电压可从2.8V到6V，并可提供300mA的输出电流，在300mA的负载下其压差电压(dropout voltage)仅仅只有290mV，APL5317适用于移动电话、可携式设备、笔记本电脑等。APL5317的输出电压可由IC内部决定，也可因应使用上之需求透过外部电阻进行设定，而/SHDN接脚可使IC进入关闭模式以减少功率的消耗，APL5317透过内部的P信道MOSFET做为传送组件，可在任何负载或压差电压下供应稳定的输出电流，其系统保护功能包括了过热保护、限电流以及短路保护，提供系统完善的保护，APL5317采用小型SOT-23-5封装。工作温度范围在-40℃至+85℃之间。

The APL5317 is a low dropout linear regulator which only needs a single input voltage supply from 2.8 to 6V, and it can deliver current up to 300mA to a set output voltage. It can work with low ESR ceramic capacitors that make it ideal for using in the battery-powered applications, such as notebook computers and cellular phones. Its typical dropout voltage is only 230mV at 300mA loading. The APL5317 provides two output voltage operation modes, the fixed output voltage mode and the adjustable output voltage, controlled by the SET pin for setting the output
voltage. The fixed output voltage mode sets the output to a preset voltage (only 1.2V available now) in the chip by connecting SET pin to the ground, and the adjustable output voltage mode needs two resistors as a voltage divider connected to SET pin to define the output. The current-limit with current foldback and thermal shutdown functions protect the device against current over-loads and over temperature. The APL5317 is available in a SOT-23-5 package.

APL5317特性
· APL5317 Wide Operating Voltage: 2.8~6V
· APL5317 Low Dropout Voltage:230mV(Typical) @ 300mA
· APL5317 Guaranteed 300mA Output Current
· APL5317 Two Modes for Setting Output Voltage
- Fixed Output Voltage: 1~5V
- Adjustable Output Voltage: 0.8~5.5V
· APL5317 Current-Limit Protection with Foldback Current
· APL5317 Internal Soft-Start
·APL5317  Over-Temperature Protection
· APL5317 Stable with Low ESR Ceramic Capacitor
· SOT-23-5 Package
·APL5317  Lead Free and Green Devices Available(RoHS Compliant)

APL5317应用领域
· Cellular Phones
· Portable and Battery-Powered Equipment
· Notebook and Personal Computers

相关文章:
LDO的典型应用
LDO低压差线性稳压器基本原理及应用
LDO线性稳压器拓扑结构及分类