Linear LTCR3625可編程超大電容充電方案

Linear 公司的LTCR3625/LTC3625-1是可編程超大電容充電器，能從2.7V-5.5V輸入電源中給兩個串聯電容充電到4.8V/5.3V 或 4V/4.5V，可進行高效的降壓/升壓充電，并自動平衡電池的充電以免受損害。充電電流高達500mA（一個電感）或1A（兩個電感），主要用在服務器，RAID系統，海量存儲，大電流備份電源，固態硬驅動，無線功率表以及高峰值功率升壓電源。本文介紹了LTCR3625/LTC3625-1主要特性，方框圖，1A SCAP充電器，太陽能供電SCAP 充電器，以及5V和12V電源。

The LTCR3625/LTC3625-1 are programmable supercapacitor chargers designed to charge two supercapacitors in series to a fixed output voltage (4.8V/5.3V or 4V/4.5V selectable) from a 2.7V to 5.5V input supply. Automatic cell balancing prevents overvoltage damage to either supercapacitor while maximizing charge rate. No balancing resistors are required.

High efficiency, high charging current, low quiescent current and low minimum external parts count (one inductor, one bypass capacitor at VIN and one programming resistor) make the LTC3625/LTC3625-1 ideally suited for small form factor backup or high peak power systems.

Charging current/maximum input current level is programmed with an external resistor. When the input supply is removed and/or the EN pin is low, the LTC3625/LTC3625-1 automatically enter a low current state, drawing less than 1μA from the supercapacitors.

The LTC3625/LTC3625-1 are available in a compact 12 lead 3mmx ?4mmx?0.75mm DFN package.

LTCR3625/LTC3625-1主要特性：

High Efficiency Step-Up/Step-Down Charging of Two Series Supercapacitors

Automatic Cell Balancing Prevents Capacitor Overvoltage During Charging

Programmable Charging Current Up to 500mA (Single Inductor), 1A (Dual Inductor)
VIN = 2.7V to 5.5V

Selectable 2.4V/2.65V Regulation per Cell (LTC3625)

Selectable 2V/2.25V Regulation per Cell (LTC3625-1)

Low No-Load Quiescent Current: 23μA

IVOUT, IVIN 1μA in Shutdown

Low Profile 12-lead 3mmx ?4mm DFN Package

LTCR3625/LTC3625-1應用：

Servers, RAID Systems, Mass Storage, High Current Backup Supplies

Solid State Hard Drives

Wireless Power Meters

High Peak Power Boosted Supplies


圖1。LTCR3625/LTC3625-1方框圖