DC1735A: 2-Cell Supercap Charger With Backup Power Controller

Summary

DC1735A is a 2-cell supercap charger with a backup PowerPath controller, featuring the LTC3226. It includes a charge-pump supercapacitor charger with programmable output voltage, a low dropout regulator and a power-fail comparator for switching between normal and backup modes.

The constant-input current supercapacitor charger is designed to charge two supercapacitors in series to a resistor programmable output voltage from a 2.5V to 5.3V input supply. The charger input current limit is programmable by an external resistor up to 315mA.

The internal backup LDO is powered from the supercapacitors and provides up to 2A peak output current with an adjustable output voltage. When the input supply falls below the resistor programma-ble power-fail threshold, the LTC3226 automatically enters a backup state in which the supercapacitors power the output through the LDO.

Specifications

Manufacturer	Analog Devices Inc.
Category	Power Management
Sub-Category	Capacitor Chargers
Eval Board Part Number	DC1735A-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	2.5 ~ 5.5 V
Voltage Out (Max)	5.5 V
Charge Current (Max)	2 A
Topology	Buck-Boost
Features	Adjustable Output Voltage Automatic Cell Balancing Internal Backup LDO Power Fail Indicator Shutdown, Enable, Standby
Quiescent Current	20 µA
Component Count + Extras	15 + 41
Main I.C. Base Part	LTC3226
Design Author	Linear Technology
Date Created By Author	2011-05
Date Added To Library	2019-06