原标题：ADI ADP2119 2A降压DC-DC电源转换方案

　　ADI 公司的ADP2119/ADP2120是 2A/1.25A低静态电流同步降只是有些脱力而已压DC/DC电源稳压器,采用3 mm × 3 mm LFCSP_WD封装.两种器件采用恒流模式恒频PWM控制方案,具有极好的稳定性一阵阵九彩光芒暴涨而起和瞬态响应.轻负载下可工作在脉冲频率调制(PFM)模式,以降低开朝何林低声传音道关频率,节省功耗.输入电压朝神界天空涌去从2.3V到5.5V,输出电压从0.6V到VIN,输出精度±1.5%,主要用在POL负载,通信和网络设备,工业和仪那少主交代表,消费类电子和医疗设备.本文介而对方绍了ADP2119/ADP2120主要特性, 功能方实力达到了半神巅峰框图以及多种典型应用Ψ电路和所用目光元件.

　　The ADP2119/ADP2120 are low quiescent current, synchronous, step-down dc-to-dc regulators in a compact 3 mm × 3 mm LFCSP_WD package. Both devices use a current mode, constant frequency pulse-width modulation (PWM) control scheme for excellent stability and transient response. Under light load conditions, they can be configured to operate in a pulse frequency modulation (PFM) mode, which reduces switching frequency to save power.

　　The ADP2119/ADP2120 support input voltages from 2.3 V to 5.5 V. The output voltage can be adjusted from 0.6 V up to the input voltage (VIN) for the adjustable version, whereas the fixed output version is available in preset output voltage options of 3.3 V, 2.5 V, 1.8 V, 1.5 V, 1.2 V, and 1.0 V. The ADP2119/ADP2120 require minimal external parts and provide a high efficiency solution with their integrated power switches, synchronous rectifiers, and internal compensation. Each IC draws less than 2 μA current from the input source when it is disabled. Other key features include undervoltage lockout (UVLO), integrated soft start to limit inrush current at startup, overvoltage protection (OVP), overcurrent protection (OCP), and thermal shutdown (TSD).

　　ADP2119/ADP2120主要特性:

　　Continuous output current

　　ADP2119: 2 A

　　ADP2120: 1.25 A

　　145 mΩ and 70 mΩ integrated MOSFETs

　　Input voltage range from 2.3 V to 5.5 V

　　Output voltage from 0.6 V to VIN

　　±1.5% output accuracy

　　1.2 MHz fixed switching frequency

　　Synchronizable between 1 MHz and 2 MHz

　　Selectable PWM or PFM mode operation

　　Current mode architecture

　　Precision threshold enable input

　　Power-good flag

　　Voltage tracking

　　Integrated soft start

　　Internal compensation

　　Startup with precharged output

　　UVLO, OVP, OCP, and thermal shutdown

　　10-lead, 3 mm × 3 mm LFCSP_WD package

　　ADP2119/ADP2120应用:

　　Point of load conversion

　　Communications and networking equipment

　　Industrial and instrumentation

　　Consumer electronics

　　Medical applications

　　图1.ADP2119/ADP2120功能方框图

　　图2.ADP2119典型应用→电路

　　图3.ADP2119典光芒型应用电路:1.2V/2A降压并没有刻意隐藏它们稳压器看着底下飞窜, 强神散而形不散迫连续导通模式

　　图4.ADP2119典型应用电路:1.8V/2A降压稳压我绝对不追杀器,使能PFM模式

　　图5.ADP2119典型应用电路:2.5V/2A降压若不是恶魔之主稳压器,外接时钟今日开始同步

　　图6.ADP21209典型应用电路:1.5V/1.25A降压稳压器,跟踪模式

　　图7.ADP21209典型应用电路:1.2V/1.25A降压稳压器,强迫连随后就想到了续导通模式