LTC3128
Info : RECOMMENDED FOR NEW DESIGNS
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LTC3128

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

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Info : RECOMMENDED FOR NEW DESIGNS tooltip
Info : RECOMMENDED FOR NEW DESIGNS tooltip
Part Details
Part Models 8
1ku List Price Starting From $4.72
Features
  • ±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
Additional Details
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The LTC3128 is a highly efficient, buck-boost DC/DC supercapacitor charger. It operates efficiently from input voltages above, below or equal to the output voltage. The LTC3128 incorporates accurate programmable average input current limit, active charge balancing and programmable maximum capacitor voltage. This combination of features makes the LTC3128 ideal for safely charging and protecting large capacitors in backup power systems. The input current limit and maximum capacitor voltage are each programmed using a single resistor. Average input current is accurately controlled over a 0.5A to 3A programmable range while the individual maximum capacitor voltage can be set from 1.8V to 3.0V.

Other features of the LTC3128 include <2μA quiescent current from VOUT in Burst Mode®operation, accurate power-good and power failure indicators, and thermal overload protection. The LTC3128 is offered in low profile, thermally enhanced 20-Lead 4mm × 5mm × 0.75mm QFN and 24-Lead TSSOP packages.

Applications

  • Supercapacitor Based Backup Power
  • Memory Backup
  • Servers, RAID, RF Systems
  • Industrial, Communications, Computing
Part Models 8
1ku List Price Starting From $4.72

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Documentation

Documentation

Part Model Pin/Package Drawing Documentation CAD Symbols, Footprints, and 3D Models
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Product Lifecycle

PCN

Apr 6, 2022

- 22_0068

Laser Top Mark for ETSSOP and TSSOP Packages Assembled in ADPG [PNG] and UTL

LTC3128EFE#PBF

PRODUCTION

LTC3128EFE#TRPBF

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LTC3128IFE#PBF

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Filter by Model

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Part Models

Product Lifecycle

PCN

Apr 6, 2022

- 22_0068

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Laser Top Mark for ETSSOP and TSSOP Packages Assembled in ADPG [PNG] and UTL

LTC3128EFE#PBF

PRODUCTION

LTC3128EFE#TRPBF

PRODUCTION

LTC3128IFE#PBF

PRODUCTION

LTC3128IFE#TRPBF

PRODUCTION

Software & Part Ecosystem

Software & Part Ecosystem

Evaluation Kit

Evaluation Kits 1

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DC1887A

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

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DC1887A

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

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

Product Detail

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.

Tools & Simulations

Tools & Simulations 1

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.

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