ADI ADP125低静态电流线性电源解决方案

1、ADI ADP125低静态电流线性电源解决方案关键词：电源管理,DC/DC转换器,线性电源,LDOADI公司的ADP125是5.5V输入500mA输出电流的低静态电流CMOS线性电源稳压器,输入电压从2.3V到5.5V,500A电流时的压降为130mV,有固定输出和可调输出两种型号,可调输出从0.8 V 到 5.0 V,100kHz的PSRR为60dB，主要用在数码相机和音频设备，手持设备，自动读表(AMR),GPS和本地管理单元，医疗设备和POL本文介绍了ADP125主要特性，ADP124/ADP125方框图，应用电路以及ADP124/ADP125评估板电路图和材料清单5.5 V Input

2、, 500 mA, Low Quiescent Current, CMOS Linear RegulatorsThe ADP124/ADP125 are low quiescent current, low dropout linear regulators. They are designed to operate from an input voltage between 2.3 V and 5.5 V and to provide up to 500 mA of output current. The low 130 mV dropout voltage at a 500 mA load

3、 improves efficiency and allows operation over a wide input voltage range.The low 210 A of quiescent current with a 500 mA load makes the ADP124/ADP125 ideal for battery-operated portable equipment.The ADP124 is capable of 31 fixed-output voltages from 1.75 V to 3.3 V. The ADP125 is the adjustable v

4、ersion of the device and allows the output voltage to be set between 0.8 V and 5.0 V by an external voltage divider.The ADP124/ADP125 are specifically designed for stable operation with tiny 1 F ceramic input and output capacitors to meet the requirements of high performance, space constrained appli

5、cations.The ADP124/ADP125 have an internal soft start that gives a constant start-up time of 350 s. Short-circuit protection and thermal overload protection circuits prevent damage in adverse conditions. The ADP124/ADP125 are available in 8-lead exposed paddle MSOP and LFCSP packages. When compared

6、with the standard MSOP and LFCSP packages, the exposed paddle MSOP and LFCSP packages have lower thermal resistance (JA). The lower thermal resistance package allows the ADP124/ ADP125 to meet the needs of a variety of portable applications while minimizing the rise in junction temperature.ADP125主要特

7、性:Input voltage supply range: 2.3 V to 5.5 V500 mA maximum output currentFixed and adjustable output voltage versions1% initial accuracyUp to 31 fixed-output voltage options available from 1.75 V to 3.3 VAdjustable-output voltage range from 0.8 V to 5.0 VVery low dropout voltage: 130 mVLow quiescent

8、 current: 45 ALow shutdown current: 1 AExcellent PSRR performance: 60 dB at 100 kHzExcellent load/line transient responseOptimized for small 1.0 F ceramic capacitorsCurrent limit and thermal overload protectionLogic controlled enableCompact 8-lead exposed paddle MSOP and LFCSP packagesADP125应用:Digit

9、al camera and audio devicesPortable and battery-powered equipmentAutomatic meter reading (AMR) metersGPS and location management unitsMedical instrumentationPoint of load power图1.ADP124内部方框图(固定输出)图2.ADP125内部方框图(可调输出)ADP124/ADP125评估板评估板主要特性:Input voltage range: 2.3 V to 5.5 VOutput current range: 0 mA to 500 mAOutput voltage accuracy: 1%AO-Electronics 傲壹电子 官网： 中文网：Operat