LTC3128
RECOMMENDED FOR NEW DESIGNS3A Monolithic Buck-Boost Supercapacitor Charger and Balancer with Accurate Input Current Limit
- Part Models
- 8
- 1ku List Price
- Starting From $5.98
Overview
- ±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
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
Documentation
Data Sheet 1
User Guide 1
Technical Articles 1
Product Selector Card 1
Brochure 1
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal. View our quality and reliability program and certifications for more information.
| Part Model | Pin/Package Drawing | Documentation | CAD Symbols, Footprints, and 3D Models |
|---|---|---|---|
| LTC3128EFE#PBF | 24-Lead TSSOP w/ EP | ||
| LTC3128EFE#TRPBF | 24-Lead TSSOP w/ EP | ||
| LTC3128EUFD#PBF | 20-Lead QFN (4mm x 5mm x 0.75mm w/ EP) | ||
| LTC3128EUFD#TRPBF | 20-Lead QFN (4mm x 5mm x 0.75mm w/ EP) | ||
| LTC3128IFE#PBF | 24-Lead TSSOP w/ EP | ||
| LTC3128IFE#TRPBF | 24-Lead TSSOP w/ EP | ||
| LTC3128IUFD#PBF | 20-Lead QFN (4mm x 5mm x 0.75mm w/ EP) | ||
| LTC3128IUFD#TRPBF | 20-Lead QFN (4mm x 5mm x 0.75mm w/ EP) |
| Part Models | Product Lifecycle | PCN |
|---|---|---|
|
Feb 14, 2025 - 25_0016 Bond Wire Change from Gold to Copper Wire (Notification Only) |
||
| LTC3128EFE#PBF | PRODUCTION | |
| LTC3128EFE#TRPBF | PRODUCTION | |
| LTC3128EUFD#PBF | PRODUCTION | |
| LTC3128EUFD#TRPBF | PRODUCTION | |
| LTC3128IFE#PBF | PRODUCTION | |
| LTC3128IFE#TRPBF | PRODUCTION | |
| LTC3128IUFD#PBF | PRODUCTION | |
| LTC3128IUFD#TRPBF | PRODUCTION | |
|
Apr 6, 2022 - 22_0068 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 | |
This is the most up-to-date revision of the Data Sheet.
Software Resources
Can't find the software or driver you need?
Request a Driver/SoftwareHardware Ecosystem
Tools & Simulations
LTspice
Models for the following parts are available in LTspice:
- LTC3128
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
LTC3128 Demo Board | 2-Cell Supercap Charger and Balancer: 1.72VIN to 5.5VIN @ up to 3A