基于LTC3675設(shè)計(jì)的七路大功率PMIC管理技術(shù)

本文介紹了LTC3675主要特性，方框圖，以及多種典型應(yīng)用電路。Linear 公司的LTC3675是七路可配置大功率PMIC，包括多個(gè)輸出的電源和兩串LED驅(qū)動(dòng)器。LTC3675集成了四個(gè)同步降壓DC/DC轉(zhuǎn)換器（1A/1A/500mA/500mA)，一個(gè)1A升壓轉(zhuǎn)換器和一個(gè)降壓-升壓轉(zhuǎn)換器，兩個(gè)I2C控的40V LED驅(qū)動(dòng)器以及常開(kāi)的25mA LDO.其中的C可編程輸出電壓，工作模式和開(kāi)關(guān)節(jié)點(diǎn)轉(zhuǎn)換速率，主要用在5-10W大功率單個(gè)鋰離子/聚合物電池，手提工業(yè)應(yīng)用，手提儀表和終端以及多輸出低壓電源。

LTC3675主要特性：

Four Monolithic Synchronous Buck DC/DCs (1A/1A/500mA/500mA)

Buck DC/DCs Can Be Paralleled to Deliver Up to 2??Current with a Single Inductor

Independent 1A Boost and 1A Buck-Boost DC/DCs

Dual String I2C Controlled 40V LED Driver

I2C Programmable Output Voltage, Operating Mode, and Switch Node Slew Rate for All DC/DCs

I2C Read Back of DC/DC, LED Driver, Fault Status

I2C Programmable VIN and Die Temperature Warnings

Maskable Interrupts to Report DC/DC, VIN and Die Temperature Faults

Pushbutton ON/OFF/RESET

Always-On 25mA LDO

Low Quiescent Current: 16μA (All DC/DCs Off)

4mmx?7mmx?0.75mm 44-Lead QFN Package

LTC3675應(yīng)用：

High Power (5W to 10W) Single Cell Li-Ion/Polymer Applications

Portable Industrial Applications, Handy Terminals, Portable Instruments

Multioutput Low Voltage Power Supplies

圖1。LTC3675方框圖

圖2。LTC3675演示板外形圖

圖3。LTC3675應(yīng)用電路圖

圖4。LTC3675降壓應(yīng)用電路圖

圖5。LTC3675降壓穩(wěn)壓器和高壓升壓穩(wěn)壓組合應(yīng)用電路圖