基于ADI ADP230x 的1.2A超小型電流模式DC電源

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(kāi)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(fèi)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 ADP2300/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 devices 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 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 undervoltage 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 rated for the ?40℃ to +125℃ junction temperature range.

ADP2300/ADP2301主要特性：

1.2 A maximum load current

±2% output accuracy over temperature range

Wide input voltage range: 3.0 V to 20 V

700 kHz (ADP2300) or 1.4 MHz (ADP2301) switching frequency options

High efficiency up to 91%

Current-mode control architecture

Output voltage from 0.8 V to 0.85 × VIN

Automatic PFM/PWM mode switching

Precision enable pin with hysteresis

Integrated high-side MOSFET

Integrated bootstrap diode

Internal compensation and soft start

Minimum external components

Undervoltage lockout (UVLO)

Overcurrent protection (OCP) and thermal shutdown (TSD)

ADIsimPower? online design tool

Available in ultrasmall, 6-lead TSOT package

ADP2300/ADP2301應(yīng)用：

LDO replacement for digital load applications

Intermediate power rail conversion

Communications and networking

Industrial and instrumentation

Healthcare and medical

Consumer

圖1。ADP2300/ADP2301功能方框圖

圖2。ADP2300/ADP2301設(shè)計(jì)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.ADP2300—700 kHz 典型應(yīng)用(帶外接使能): VIN = 12 V, VOUT = 1.2 V/1.2 A

圖5.ADP2300—700 kHz 典型應(yīng)用(帶外接使能): VIN = 12 V, VOUT = 1.8 V/1.2 A


圖6.ADP2300—700 kHz 典型應(yīng)用(帶外接使能): VIN = 12 V, VOUT = 2.5V/1.2 A

圖7.ADP2301—1.4MHz 典型應(yīng)用(帶可編7.8V起動(dòng)輸入電壓): VIN = 12 V, VOUT = 3.3 V/1.2 A

圖8.ADP2301—1.4Hz 典型應(yīng)用(帶外接使能): VIN = 12 V, VOUT = 5.0 V/1.2 A

圖9.ADP2301—1.4Hz 典型應(yīng)用(帶外接使能): VIN = 18 V, VOUT = 5.0 V/1.2 A

圖10.ADP2301—1.4Hz 典型應(yīng)用(帶外接使能): VIN = 9 V, VOUT = 3.3 V/1.2 A

圖11.ADP2301—1.4Hz 典型應(yīng)用(帶外接使能): VIN = 5 V, VOUT = 1.8 V/1.2 A