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