LTC3625/LTC3625-1
1A High Efficiency 2-Cell
Supercapacitor Charger
with Automatic Cell
Balancing
Features Description High Efficiency Step-Up/Step-Down Charging of Two
Series Supercapacitors
n Automatic Cell Balancing Prevents Capacitor
Overvoltage During Charging
n Programmable Charging Current Up to 500mA
(Single Inductor), 1A (Dual Inductor)
n V = 2.7V to 5.5V
IN
n Selectable 2.4V/2.65V Regulation per Cell (LTC3625)
n Selectable 2V/2.25V Regulation per Cell (LTC3625-1)
n Low No-Load Quiescent Current: 23ВµA
n I
VOUT, IVIN < 1ВµA in Shutdow Low Profile 12-lead 3mm Г— 4mm DFN Package The LTCВ®3625/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. n Applications High efficiency, high charging current, low quiescent current and low minimum external parts count (one inductor, …