LTC3110 - 2A Bidirectional Buck-Boost DC/DC Regulator and Charger/Balancer


  • VCAP Operating Range: 0.1V to 5.5V
  • VSYS Operating Range: 1.71V to 5.25V
  • Automatic Switchover from Charge to Backup Mode
  • Programmable ±2% Accurate Charge Input Current Limit from 125mA to 2A
  • ±1% Backup Voltage Accuracy
  • Automatic Backup Capacitor Balancing
  • Fixed 1.2MHz Switching Frequency
  • Burst Mode® Operation: 40μA Quiescent Current
  • Built-In Programmable Multipurpose Comparator with Open-Collector Output
  • Open-Collector Outputs to Indicate Direction of Operation and End of Charge
  • Thermally Enhanced TSSOP-24 and 4mm × 4mm QFN-24 Packages

Typical Application

LTC3110 Typical Application
LTC3110 Typical Application


The LTC®3110 is a 2A bidirectional buck-boost DC/DC regulator with capacitor charger and balancer. Its wide 0.1V to 5.5V capacitor/battery voltage and 1.8V to 5.25V system backup voltage ranges make it well suited to a wide variety of backup applications using supercapacitors or batteries. A proprietary low noise switching algorithm optimizes efficiency with capacitor/battery voltages that are above, below or equal to the system output voltage.

The LTC3110 can autonomously transition from charge to backup mode or switch modes based on an external command. Pin-selectable Burst Mode operation reduces standby current and improves light-load efficiency, which combined with a 1μA shutdown current make the LTC3110 ideally suited for backup applications. Additional features include voltage supervisors for direction control and end of charge, and a general purpose comparator with open-collector output for interfacing with a μC. The LTC3110 is available in thermally enhanced, low profile 24-lead TSSOP and 4mm × 4mm QFN packages.


CAD Symbols and Footprints: The downloadable Zip file below contains the schematic symbol and PCB footprints.

For complete and up to date package information and drawings, please refer to our packaging page

Part Number Package Code Temp Package
LTC3110EFE#PBF TSSOP-24 FE E 05-08-1771 Yes
LTC3110EFE#TRPBF TSSOP-24 FE E 05-08-1771 Yes
LTC3110EUF#PBF 4x4 QFN-24 UF E 05-08-1697 Yes
LTC3110EUF#TRPBF 4x4 QFN-24 UF E 05-08-1697 Yes
LTC3110HFE#PBF TSSOP-24 FE H 05-08-1771 Yes
LTC3110HFE#TRPBF TSSOP-24 FE H 05-08-1771 Yes
LTC3110HUF#PBF 4x4 QFN-24 UF H 05-08-1697 Yes
LTC3110HUF#TRPBF 4x4 QFN-24 UF H 05-08-1697 Yes
LTC3110IFE#PBF TSSOP-24 FE I 05-08-1771 Yes
LTC3110IFE#TRPBF TSSOP-24 FE I 05-08-1771 Yes
LTC3110IUF#PBF 4x4 QFN-24 UF I 05-08-1697 Yes
LTC3110IUF#TRPBF 4x4 QFN-24 UF I 05-08-1697 Yes

LTC3110 Package Drawing
LTC3110 Package Drawing

Order Info

  • Part numbers ending in PBF are lead free. Solder plated terminal finish (SnPb) versions are non-standard and special terms and conditions and pricing applies if available. Please contact LTC marketing for information.
  • Part numbers containing TR or TRM are shipped in tape and reel or 500 unit mini tape and reel, respectively
  • Please refer to our general ordering information or the product datasheet for more details

Package Variations and Pricing

Part Number Package Temp Price
LTC3110EFE#PBF TSSOP-24 E $7.14 $5.00 Yes
LTC3110EFE#TRPBF TSSOP-24 E $5.06 Yes
LTC3110EUF#PBF 4x4 QFN-24 E $6.36 $4.45 Yes
LTC3110EUF#TRPBF 4x4 QFN-24 E $4.51 Yes
LTC3110HFE#PBF TSSOP-24 H $8.29 $5.80 Yes
LTC3110HFE#TRPBF TSSOP-24 H $8.35 $5.86 Yes
LTC3110HUF#PBF 4x4 QFN-24 H $7.43 $5.20 Yes
LTC3110HUF#TRPBF 4x4 QFN-24 H $7.49 $5.26 Yes
LTC3110IFE#PBF TSSOP-24 I $7.93 $5.55 Yes
LTC3110IFE#TRPBF TSSOP-24 I $5.61 Yes
LTC3110IUF#PBF 4x4 QFN-24 I $6.93 $4.85 Yes
LTC3110IUF#TRPBF 4x4 QFN-24 I $4.91 Yes
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* The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Linear Technology sales office or authorized distributor.

Demo Boards

Linear Technology offers many demo boards free of charge to qualified customers. Contact your local sales office or distributor to inquire about a demo board. Certain demo boards are also available for sale via credit card on this website. Demo boards are for evaluation purposes only. It remains the customer’s responsibility to verify proper and reliable operation in the actual end application.

Part Number Description Price Documentation
DC1964A LTC3110 Demo Board | Bidirectional Buck-Boost with Supercap Charger/Balancer, 1.8V ≤ VIN ≤ 5.5V, 1.8V or 3.2V VBACKUP at 2A Contact Factory
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Click here to view our complete list of demo boards


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