ADI ADP1614 650 kHz/1.3 MHz 4A 升壓PWM DC－DC轉換器設計方案

ADI公司的ADP1614是一款內部集成輸出達到20V電壓的功率開(kāi)關(guān)的升壓型DC/DC轉換器，ADP1614采用外部電阻的設置限制輸出電流的大小，ADP1614采用兩種固定的增壓開(kāi)關(guān)頻率，分別為650KHz和1.3MHz。ADP1614在對空間有約束的應用中占有很大優(yōu)勢，常用于便攜式產(chǎn)品中。ADP1614具有在電流模式下PWM效率達到94%，使能器件可調軟開(kāi)關(guān)保護涌入電流，在電流模式下具有優(yōu)秀的瞬態(tài)響應，同時(shí)具有欠壓閉鎖、過(guò)熱保護等特點(diǎn)。本文通過(guò)總結ADP1614器件的特點(diǎn)，介紹器件、特性、應用方向及內部結構框圖，并給參考設計實(shí)例原理圖、制板圖及元器件清單。

The ADP1614 is a step-up, dc-to-dc switching converter with an integrated power switch capable of providing an output voltage as high as 20 V. The ADP1614 is available with a pin-adjustable current limit that is set via an external resistor. The boost switching frequency is fixed to either 650 kHz or 1.3 MHz. With a package height of 0.8 mm, the ADP1614 is optimal for space constrained applications, such as portable devices or thin film transistor (TFT) liquid crystal displays (LCDs).

The ADP1614 operates in current-mode pulse-width modulation (PWM) with up to 94% efficiency. Adjustable soft start prevents inrush currents when the part is enabled. The PWM current-mode architecture allows excellent transient response, easy noise filtering, and the use of small, cost-saving external inductors and capacitors. Other key features include undervoltage lockout (UVLO), thermal shutdown (TSD), and logic controlled enable.

The ADP1614 is available in a Pb-free, 10-lead lead frame chip scale package (LFCSP).

ADP1614主要特性：

Adjustable current limit, up to 4 A

2.5 V to 5.5 V input voltage range

650 kHz or 1.3 MHz fixed frequency option

Adjustable output voltage, up to 20 V

Adjustable soft start

Undervoltage lockout

Thermal shutdown

3 mm × 3 mm, 10-lead LFCSP

Supported by ADIsimPower design tool

ADP1614應用：

TFT LCD bias supplies

Portable applications

Industrial/instrumentation equipment

圖1. ADP1614方框圖

ADP1614參考設計主要特性：

2.5 V to 5.5 V input voltage range

650 kHz or 1.3 MHz fixed frequency options

Adjustable current limit up to 4 A

Output voltage

5 V for ADP1614-650-EVALZ

15 V for ADP1614-1.3-EVALZ

Jumper for enable/shutdown control

Components optimized for the indicated output voltages

ADP1614設計原理圖：

圖2. ADP1614設計原理圖