LTC4425
Linear SuperCap Charger
with Current-Limited Ideal
Diode and V/I Monitor
Description Features
50mО© Ideal Diode from VIN to VOUT
Smart Charge Current Profile Limits Inrush Current
Internal Cell Balancer (No External Resistors)
Programmable Output Voltage (LDO Mode)
Programmable VIN to VOUT Current Limit
Continuous Monitoring of VIN to VOUT Current via
PROG Pi Low Quiescent Current: 20ОјA
n V Power Fail, PGOOD Indicator
IN
n 2.45V/2.7V Cell Protection Shunts
(4.9V/5.4V SuperCap Max Top-Off Voltage)
n 3A Peak Current Limit, Thermal Limiting
n Tiny Application Circuit, 3mm Г— 3mm Г— 0.75mm DFN
and 12-Lead MSOP Packages n n n n n The LTCВ®4425 is a constant-current/constant-voltage linear
charger designed to charge a 2-cell supercap stack from
either a Li-Ion/Polymer battery, a USB port, or a 2.7V to
5.5V current-limited supply. The part operates as an ideal
diode with an extremely low 50mО© on-resistance making …