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

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Support Documents & Media

DC1735A - User Guide LTC3226 - Datsheet DC1735A - Design Files

Media

DC1735A - Schematic DC1735A - Board DC1735A - Chart DC1735A - Set Up