簡(jiǎn)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(yáng)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(lái)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(wú)線檢測(cè)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(wú)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(hào)。第二個(gè)輸出可以由主機(jī)來(lái)使能。一個(gè)存儲(chǔ)電容器在沒(méi)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 VOUT：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：
詳情請(qǐng)參考：
http://cds.linear.com/docs/Demo%20Board%20Manual/dc1582B.pdf
