DC1887A: 2-Cell Supercapacitor Charger and Balancer Converter

Summary

DC1887 is a DC/DC supercapacitor buck-boost charger and balancer converter featuring the LTC3128. The DC1887A operates over 1.72V to 5.5V input and charges the output up to 5.5V. Also, the LTC3128 has 2% precision input current limit, which allows the circuit to operate effectively with current limited input power sources like the USB.

The 1.2MHz switching frequency operation results in a small and efficient circuit. The converter provides high output voltage accuracy (typically ±2%) over a 1.72V to 5.5V input. The demonstration circuit can be easily modified to generate different output voltages.

Specifications

Manufacturer Analog Devices Inc.
Category Power Management
Sub-Category Capacitor Chargers
Eval Board Part Number DC1887A-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 1.72 ~ 5.5 V
Voltage Out (Max) 4.2 V
Charge Current (Max) 1 A
Topology Buck-Boost
Features ±2% Output Accuracy
Active Charge Balancing
Adjustable Output Voltage
Power Fail Indicator
Power Good Indicator
Shutdown, Enable, Standby
Quiescent Current 600 µA
Component Count + Extras 20 + 22
Main I.C. Base Part LTC3128
Design Author Linear Technology
Date Created By Author 2013-11
Date Added To Library 2019-06

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Support Documents & Media

DC1887A - User Guide LTC3128 - Datasheet DC1887A - Design Files

Media

DC1887A - Schematic DC1887A - Board DC1887A - Set Up