LTC3128

RECOMMENDED FOR NEW DESIGNS

3A Monolithic Buck-Boost Supercapacitor Charger and Balancer with Accurate Input Current Limit

Data Sheet Product Selection Table
Part Models
8
1ku List Price
Starting From $4.72
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Part Details

  • ±2% Accurate Average Input Current Limit Programmable Up to 3A
  • Programmable Maximum Capacitor Voltage Limit
  • Active Charge Balancing for Fast Charging of Unmatched Capacitors
  • Charges Single or Stacked Capacitors
  • VIN Range: 1.73V to 5.5V
  • VOUT Range: 1.8V to 5.5V
  • <2μA Quiescent Current from VOUT When Charged
  • Output Disconnect in Shutdown: <1μA IQ Shutdown
  • Power-Good Comparator
  • Power Failure Indicator
  • Thermally Enhanced 20-Lead (4mm × 5mm × 0.75mm) QFN and 24-Lead TSSOP Packages
LTC3128
3A Monolithic Buck-Boost Supercapacitor Charger and Balancer with Accurate Input Current Limit
Wide VIN (3A Programmed Input Current) to 4.2V Stacked Output Capacitors Charging Waveform Product Package 1 Product Package 1
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Documentation

Data Sheet 1

Reliability Data 1

User Guide 1

Technical Articles 1

Data Sheet

This is the most up-to-date revision of the Data Sheet.

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Hardware Ecosystem

Parts Product Life Cycle Description
Supercapacitor Chargers 1
LTC3110
RECOMMENDED FOR NEW DESIGNS 2A Bidirectional Buck-Boost DC/DC Regulator and Charger/Balancer
Switching Battery Chargers 1
LTC4040
RECOMMENDED FOR NEW DESIGNS 2.5A Battery Backup Power Manager
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Tools & Simulations

LTspice 1

Models for the following parts are available in LTspice:

  • LTC3128
LTspice

LTspice® is a powerful, fast and free simulation software, schematic capture and waveform viewer with enhancements and models for improving the simulation of analog circuits.

Evaluation Kits

eval board
schematic 1
schematic 2
schematic 3
schematic 4
schematic 5
DC1887A

LTC3128 Demo Board | 2-Cell Supercap Charger and Balancer: 1.72VIN to 5.5VIN @ up to 3A

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Product Details

Demonstration circuit 1887 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.
DC1887A
LTC3128 Demo Board | 2-Cell Supercap Charger and Balancer: 1.72VIN to 5.5VIN @ up to 3A
DC1887A Demo Board DC1887A Demo Board DC1887A Demo Board DC1887A Demo Board DC1887A - Schematic

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