DC1887A: 2-Cell Supercapacitor Charger and Balancer Converter


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.


Manufacturer Linear Technology/Analog Devices
Category Power Management
Sub-Category Capacitor Chargers
Eval Board Part Number DC1887A-ND
Eval Board Supplier Linear Technology/Analog Devices
Input Voltage 1.72 ~ 5.5 V
Function Charger Controller
Number of Capacitors 2
Output Voltage (Max) 4.2 V
Topology Buck-Boost
Charge Current (Max) 1 A
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

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