LTC3350

RECOMMENDED FOR NEW DESIGNS

LTC3350

High Current Supercapacitor Backup Controller and System Monitor

RECOMMENDED FOR NEW DESIGNS

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Part Models 6

1ku List Price Starting From $5.15

Features

High Efficiency Synchronous Step-Down CC/CV Charging of One to Four Series Supercapacitors
Step-Up Mode in Backup Provides Greater Utilization of Stored Energy in Supercapacitors
14-Bit ADC for Monitoring System Voltages/Currents, Capacitance and ESR
Active Overvoltage Protection Shunts
Internal Active Balancers—No Balance Resistors

V_IN: 4.5V to 35V, V_CAP(n): Up to 5V per Capacitor, Charge/Backup Current: 10+A
Programmable Input Current Limit Prioritizes System Load Over Capacitor Charge Current
Dual Ideal Diode PowerPath^™ Controller
All N-FET Charger Controller and PowerPath Controller
Compact 38-Lead 5mm × 7mm QFN Package
AEC-Q100 Qualified for Automotive Applications

Additional Details

The LTC3350 is a backup power controller that can charge and monitor a series stack of one to four supercapacitors. The LTC3350’s synchronous step-down controller drives N‑channel MOSFETs for constant current/constant voltage charging with programmable input current limit. In addition, the step-down converter can run in reverse as a step-up converter to deliver power from the supercapacitor stack to the backup supply rail. Internal balancers eliminate the need for external balance resistors and each capacitor has a shunt regulator for overvoltage protection.

The LTC3350 monitors system voltages, currents, stack capacitance and stack ESR which can all be read over the I²C/SMBus. The dual ideal diode controller uses N-channel MOSFETs for low loss power paths from the input and supercapacitors to the backup system supply. The LTC3350 is available in a low profile 38-lead 5mm × 7mm × 0.75mm QFN surface mount package.

APPLICATIONS

High Current 12V Ride-Through UPS
Servers/Mass Storage/High Availability Systems

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Ask a Question

Submit your question below and we will return the best answer from ADI’s knowledge database:

Other places you can find help

Support

Analog Devices Support Portal is a one-stop shop to answer all your ADI questions.

Visit the ADI Support Page

Ask the ADI community for help.

Ask the EngineerZone Community

FAQs

Sales & Ordering FAQs

Part Models 6

1ku List Price Starting From $5.15

Technical Documents 5

LTC3350: High Current Supercapacitor Backup Controller and System Monitor Data Sheet (Rev.D) 08/19/2015

R575 Reliability Data 03/23/2018

DC1937B - Demo Manual 12/15/2015

Got Backup? Maintain Power Continuity 09/01/2018

Supercap Backup Circuit Provides Reliable Uninterrupted Power 09/29/2014

Reference Materials 3

Backup Power Solutions 07/13/2017

Power You Can Trust: Achieving Efficient Battery-Powered Solutions 11/07/2023

Energy Storage Using Supercapacitors: How Big Is Big Enough? 07/01/2020

Design Resources 6

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
LTC3350EUHF#PBF	38-Lead QFN (5mm x 7mm w/ EP)	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LTC3350EUHF#TRPBF	38-Lead QFN (5mm x 7mm w/ EP)	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LTC3350IUHF#PBF	38-Lead QFN (5mm x 7mm w/ EP)	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LTC3350IUHF#TRPBF	38-Lead QFN (5mm x 7mm w/ EP)	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LTC3350IUHF#WPBF	38-Lead QFN (5mm x 7mm w/ EP)	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys
LTC3350IUHF#WTRPBF	38-Lead QFN (5mm x 7mm w/ EP)	HTML Material Declaration HTML Reliablity Data	Ultra Librarian SamacSys

LTC3350EUHF#PBF
Pin/Package Drawing
38-Lead QFN (5mm x 7mm w/ EP)
Documentation

HTML Material Declaration

HTML Reliablity Data

CAD Symbols, Footprints, and 3D Models
Ultra Librarian
SamacSys

LTC3350EUHF#TRPBF
Pin/Package Drawing
38-Lead QFN (5mm x 7mm w/ EP)
Documentation

HTML Material Declaration

HTML Reliablity Data

CAD Symbols, Footprints, and 3D Models
Ultra Librarian
SamacSys

LTC3350IUHF#PBF
Pin/Package Drawing
38-Lead QFN (5mm x 7mm w/ EP)
Documentation

HTML Material Declaration

HTML Reliablity Data

CAD Symbols, Footprints, and 3D Models
Ultra Librarian
SamacSys

LTC3350IUHF#TRPBF
Pin/Package Drawing
38-Lead QFN (5mm x 7mm w/ EP)
Documentation

HTML Material Declaration

HTML Reliablity Data

CAD Symbols, Footprints, and 3D Models
Ultra Librarian
SamacSys

LTC3350IUHF#WPBF
Pin/Package Drawing
38-Lead QFN (5mm x 7mm w/ EP)
Documentation

HTML Material Declaration

HTML Reliablity Data

CAD Symbols, Footprints, and 3D Models
Ultra Librarian
SamacSys

LTC3350IUHF#WTRPBF
Pin/Package Drawing
38-Lead QFN (5mm x 7mm w/ EP)
Documentation

HTML Material Declaration

HTML Reliablity Data

CAD Symbols, Footprints, and 3D Models
Ultra Librarian
SamacSys

Companion Parts 2

Parts	Product Life Cycle	Description
PowerPath, Ideal Diodes, and Load Switches1
LTC4353	RECOMMENDED FOR NEW DESIGNS	Dual Low Voltage Ideal Diode Controller
Supercapacitor Chargers1
LTC3110	RECOMMENDED FOR NEW DESIGNS	2A Bidirectional Buck-Boost DC/DC Regulator and Charger/Balancer

Alternative Parts 2

Parts	Product Life Cycle	Description
LTC3355	RECOMMENDED FOR NEW DESIGNS	20V 1A Buck DC/DC with Integrated SCAP Charger and Backup Regulator
LTC3351	RECOMMENDED FOR NEW DESIGNS	Hot Swappable Supercapacitor Charger, Backup Controller and System Monitor

Evaluation Software 1

ZIP LTC3350_SDK.zip

DC1937B

LTC3350EUHF Demo Board | High Current Supercapacitor Backup Controller and System Monitor, up to 20VIN

LTC3350EUHF Demo Board | High Current Supercapacitor Backup Controller and System Monitor, up to 20VIN

Download

DC1937B

LTC3350EUHF Demo Board | High Current Supercapacitor Backup Controller and System Monitor, up to 20VIN

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Product Detail

Demonstration circuit 1937B is a supercapacitor charger and backup controller with supercapacitor health and system monitoring; featuring the LTC3350. The LTC3350 has a 10.8V to 20V_IN, 5.3A buck supercapacitor charger, a 25W output backup boost controller and an input ideal diode to disconnect the input supply in backup mode. An output ideal diode allows the supercapacitors to supply the output when VCAP is above the set backup voltage. As the capacitor stack voltage drops down to the set output voltage, the LTC3350 will operate as a boost regulator to supply the output until the energy in the supercapacitors are depleted.

Resources

ZIP

DC1937B - Design Files

4.00M

PDF

DC1937B - Schematic

119.00K

PDF

DC1937B - Demo Manual

0.00M

DC1937B

LTC3350EUHF Demo Board | High Current Supercapacitor Backup Controller and System Monitor, up to 20VIN

LTspice 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.

To launch ready-to-run LTspice demonstration circuits for this part:

Step 1: Download and install LTspice on your computer.

Step 2: Click on the link in the section below to download a demonstration circuit.

Step 3: If LTspice does not automatically open after clicking the link below, you can instead run the simulation by right clicking on the link and selecting “Save Target As.” After saving the file to your computer, start LTspice and open the demonstration circuit by selecting ‘Open’ from the ‘File’ menu.