1、ADI ADP230x 1.2A超小型電流模式DC電源穩(wěn)壓方案關(guān)鍵詞：電源管理,DC/DC轉(zhuǎn)換器ADI 公司的ADP2300/ADP2301是集成了功率MOSFET的小型緊湊固定頻率電流模式降壓DC/DC電源穩(wěn)壓器, 輸入電壓VIN從3V到20V,輸出電壓從0.8V到0.85xVIN,效率高達(dá)91%,可選擇開關(guān)頻率700 kHz (ADP2300) 或1.4 MHz (ADP2301) ,超小型6引腳TSOT封裝,主要用在系統(tǒng)內(nèi)部電源轉(zhuǎn)換,通信和網(wǎng)絡(luò)設(shè)備,工業(yè)和儀表,保健和醫(yī)療設(shè)備以及消費類電子產(chǎn)品.本文介紹ADP2300/ADP2301主要特性,方框圖,以及多種應(yīng)用電路.The ADP230

2、0/ADP2301 are compact, constant-frequency, current-mode, step-down dc-to-dc regulators with integrated power MOSFET. The ADP2300/ADP2301 devices run from input voltages of 3.0 V to 20 V, making them suitable for a wide range of applications. A precise, low voltage internal reference makes these devi

3、ces ideal for generating a regulated output voltage as low as 0.8 V, with 2% accuracy, for up to 1.2 A load current.There are two frequency options: the ADP2300 runs at 700 kHz, and the ADP2301 runs at 1.4 MHz. These options allow users to make decisions based on the trade-off between efficiency and

4、 total solution size. Current-mode control provides fast and stable line and load transient performance. The ADP2300/ADP2301 devices include internal soft start to prevent inrush current at power-up. Other key safety features include short-circuit protec-tion, thermal shutdown (TSD), and input under

5、voltage lockout (UVLO). The precision enable pin threshold voltage allows the ADP2300/ADP2301 to be easily sequenced from other input/ output supplies. It can also be used as a programmable UVLO input by using a resistive divider.The ADP2300/ADP2301 are available in a 6-lead TSOT package and are rat

6、ed for the 40 to +125 junction temperature range.ADP2300/ADP2301主要特性：1.2 A maximum load current2% output accuracy over temperature rangeWide input voltage range: 3.0 V to 20 V700 kHz (ADP2300) or 1.4 MHz (ADP2301) switching frequency optionsHigh efficiency up to 91%Current-mode control architectureO

7、utput voltage from 0.8 V to 0.85 VINAutomatic PFM/PWM mode switchingPrecision enable pin with hysteresisIntegrated high-side MOSFETIntegrated bootstrap diodeInternal compensation and soft startMinimum external componentsUndervoltage lockout (UVLO)Overcurrent protection (OCP) and thermal shutdown (TS

8、D)ADIsimPower online design toolAvailable in ultrasmall, 6-lead TSOT packageADP2300/ADP2301應(yīng)用：LDO replacement for digital load applicationsIntermediate power rail conversionCommunications and networkingIndustrial and instrumentationHealthcare and medicalConsumer圖1。ADP2300/ADP2301功能方框圖圖2。ADP2300/ADP2

9、301設(shè)計案例電路圖推薦的輸出電流1.2A外接元件表:圖3.推薦的ADP2300/ADP2301PCB布局圖典型應(yīng)用電路圖圖4.ADP2300700 kHz 典型應(yīng)用(帶外接使能): VIN = 12 V, VOUT = 1.2 V/1.2 A圖5.ADP2300700 kHz 典型應(yīng)用(帶外接使能): VIN = 12 V, VOUT = 1.8 V/1.2 A圖6.ADP2300700 kHz 典型應(yīng)用(帶外接使能): VIN = 12 V, VOUT = 2.5V/1.2 A圖7.ADP23011.4MHz 典型應(yīng)用(帶可編7.8V起動輸入電壓): VIN = 12 V, VOUT = 3.3 V/1.2 A圖8.ADP23011.4Hz 典型應(yīng)用(帶外接使能): VIN = 12 V, VOUT = 5.0 V/1.2 A圖9.ADP23011.4Hz 典型應(yīng)用(帶外接使能): VIN = 18 V, VOUT = 5.0 V/1.2 A圖10.ADP23011.4Hz 典型應(yīng)用(帶外接使能): VIN = 9