Linear LTCR3625可编程超大电容充电方案

Linear 公司的LTCR3625/LTC3625-1是可编程超大电容充电器，能从2.7V-5.5V输入电源中给两个串联电容充电到4.8V/5.3V 或 4V/4.5V，可进行高效的降压/升压充电，并自动平衡电池的充电以免受损害。充电电流高达500mA（一个电感）或1A（两个电感），主要用在服务器，RAID系统，海量存储，大电流备份电源，固态硬驱动，无线功率表以及高峰值功率升压电源。本文介绍了LTCR3625/LTC3625-1主要特性，方框图，1A SCAP充电器，太阳能供电SCAP 充电器，以及5V和12V电源。

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应用：

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

Solid State Hard Drives

Wireless Power Meters

High Peak Power Boosted Supplies


图1。LTCR3625/LTC3625-1方框图