DC1220B: 5.4V @ 150mA Charge Rate, 2 Cell, Supercapacitor Charger

Summary

DC1220B is a Low Profile Regulated Dual Cell SuperCAP Charger featuring the LTC3225. The LTC3225 is a constant-current SuperCAP charger designed to charge two SuperCAPs in series to a fixed output voltage of 4.8V/5.3V from a 2.9V to 5.5V input supply. Automatic cell balancing is achieved during the charging phase.

Low input noise, low quiescent current and low external parts count make the LTC3225 ideally suited for small, battery-powered applications. Charging current level is programmed through an external resistor. Internal current limit and thermal shutdown circuitry allows the part to survive a continuous short-circuit from PROG to GND.

When the input supply is removed, the LTC3225 automatically enters a low current state, drawing less than 1µA from the SuperCAPs.

Specifications

Manufacturer	Analog Devices Inc.
Category	Power Management
Sub-Category	Capacitor Chargers
Eval Board Part Number	DC1220B-ND
Eval Board Supplier	Analog Devices Inc.
Eval Board	Normally In Stock
Capacitor Type	Super Capacitor
Function	Charger Controller
Number of Capacitors	2
Voltage In	2.9 ~ 5.5 V
Voltage Out (Max)	5.3 V
Charge Current (Max)	150 mA
Topology	Buck-Boost
Features	Adjustable Output Current Adjustable Output Voltage Automatic Cell Balancing Power Good Indicator Short Circuit Protection Shutdown, Enable, Standby Thermal Protection
Quiescent Current	20 µA
Component Count + Extras	8 + 22
Main I.C. Base Part	LTC3225
Design Author	Linear Technology
Date Created By Author	2008-07
Date Added To Library	2019-05