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簡述：LTC3108是高度集成的升壓型 DC/DC 轉(zhuǎn)換器，該器件專為在采用極低輸入電壓電源的情況下啟動(dòng)和運(yùn)行而設(shè)計(jì)，例如：熱電發(fā)生器(TEG)、熱電堆和小型太陽能電池。其自諧振拓?fù)鋸牡椭?20mV 的輸入電壓升壓�？梢垣@取并使用小的溫差來產(chǎn)生系統(tǒng)電源，而不必使用傳統(tǒng)的電池電源。

基本特點(diǎn)：
LTC3108 采用一個(gè)小外形的升壓變換器，可提供一款面向無線檢測和數(shù)據(jù)采集應(yīng)用的完整電源管理解決方案。2.2V LDO 負(fù)責(zé)給一個(gè)外部微處理器供電，而主輸出則設(shè)置為 4 種固定電壓之一，用于為一個(gè)無線發(fā)送器或傳感器供電。當(dāng)主輸出電壓處于調(diào)節(jié)狀態(tài)時(shí)，電源良好指示器將發(fā)出指示信號。第二個(gè)輸出可以由主機(jī)來使能。一個(gè)存儲(chǔ)電容器在沒有可用的輸入電壓電源時(shí)用于提供所需的電源。極低的靜態(tài)電流和高效率設(shè)計(jì)可確保輸出存儲(chǔ)電容器擁有盡可能最快的充電時(shí)間。

從 20mV 的輸入工作

完整的能量收集電源管理系統(tǒng) 
        - 可選的 V_OUT：2.35V、3.3V、4.1V 或 5V
        - LDO：2.2V (在 3mA)
        - 邏輯控制的輸出
        - 保存能量輸出
電源良好指示器
采用緊湊的升壓型變壓器
小外形 12 引腳 (3mm x 4mm) DFN 或 16 引腳 SSOP 封裝

方案特點(diǎn)：
Demonstration Circuit 1582B featuring the LTC3108 is
a highly integrated DC/DC converter optimized for
harvesting and managing energy from extremely low
input voltage sources such as thermoelectric generators
(TEG). The step-up topology operates from input
voltages as low as 20mV.
The DC 1582B Demonstration Circuit has been optimized
for low start-up voltage with a 100:1 turns ratio transformer.
For application where it is desirable to trade-off
a higher start-up voltage for higher current, a lower turns
ratio transformer can be used. Refer to the LTC3108
datasheet for more information.
The LTC3108 is designed to accumulate and manage
energy over a long period of time to enable short bursts
of power to be used to acquire and transmit data. The
burst must occur at a low enough duty cycle such that
the total output energy during the burst does not exceed
the average source power integrated over the accumulation
time between bursts.

參考原理圖：


參考pcb圖：