LTC3351

RECOMMENDED FOR NEW DESIGNS

Hot Swappable Supercapacitor Charger, Backup Controller and System Monitor

Data Sheet (Rev. B) Product Selection Table

Part Models: 4
1ku List Price: Starting From $6.82

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Overview

Integrated Hot Swap Controller with Circuit Breaker
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
16-Bit ADC for Monitoring System Voltages/Currents, Capacitance and ESR
Programmable Undervoltage and Overvoltage Thresholds to 35V

V_IN: 4.5V to 35V, V_CAP(n): Up to 5V per Capacitor, Charge/Backup Current: >10A
Programmable Input Current Limit Prioritizes System Load Over Capacitor Charge Current
All N-FET Charger Controller and PowerPath^™ Controller
Compact 44-Lead 4mm × 7mm QFN Package

The LTC3351 is a backup power controller that charges and monitors a series stack of one to four supercapacitors. The LTC3351’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 runs 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 LTC3351 monitors system voltages, currents, stack capacitance and ESR which can all be read over the I²C/SMBus port. The hot swap controller uses N-channel MOSFETs for inrush control and a low loss path from the input to the output. The ideal diode controller uses an N-channel MOSFET for a low loss power path from the supercapacitors to the output. The LTC3351 is available in a thermally enhanced low profile 44-lead 4mm × 7mm × 0.75mm QFN surface mount package.

APPLICATIONS

Swappable PCIE Cards with NVM
High Current 12V Ride-Through UPS
Servers/Mass Storage/High Availability Systems

Part Models: 4
1ku List Price: Starting From $6.82

Documentation

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
LTC3351EUFF#PBF	44-Lead DFN (4mm x 7mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3351EUFF#TRPBF	44-Lead DFN (4mm x 7mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3351IUFF#PBF	44-Lead DFN (4mm x 7mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC3351IUFF#TRPBF	44-Lead DFN (4mm x 7mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys

Part Models	Product Lifecycle	PCN

Mar 26, 2019 - 19_0070 LTC3351 Data Sheet Specification Change
		PCN19_0070_Form Material_Report Datasheet Specification Comparison
LTC3351EUFF#PBF	PRODUCTION
LTC3351EUFF#TRPBF	PRODUCTION
LTC3351IUFF#PBF	PRODUCTION
LTC3351IUFF#TRPBF	PRODUCTION

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

Software Resources

Evaluation Software 2

LTC3351 Evaluation Software

LTC3351 Evaluation Software (Rev. )

LTC3350/LTC3351 Software

LTC3350_SDK.zip (Rev. )

Can't find the software or driver you need?

Hardware Ecosystem

Parts	Product Life Cycle	Description
Protection Switches & Controllers 1
LTC4418	RECOMMENDED FOR NEW DESIGNS	Dual Channel Prioritized PowerPath Controller

Parts	Product Life Cycle	Description
LTC3350	RECOMMENDED FOR NEW DESIGNS	High Current Supercapacitor Backup Controller and System Monitor

Tools & Simulations

Design Tool 2

Evaluation Kits

LTC3351EUFF Demo Board | Hot Swappable Supercapacitor Charger, Backup Controller and System Monitor (24V Nominal Input, 18V 36W Backup)

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Product Details

Demonstration circuit 2464A-B is a supercapacitor charger and backup controller with a hot swappable front end plus supercapacitor health and system monitoring; featuring the LTC3351. The LTC3351 includes a buck supercapacitor charger and a backup boost controller. It has dual input hot swap FETs to control the inrush current when connected and to disconnect the input supply when an over current fault or input power loss occurs. An output ideal diode allows the supercapacitors to supply the output when V_CAP is above the set backup voltage. As the capacitor stack voltage drops down to the set output voltage, the LTC3351 will operate as a boost regulator to supply the output until the energy in the supercapacitors is depleted.

Resources

DC2464A - Design Files
2/23/2018

DC2464A - Demo Board Manual
2/23/2018

DC2464A-B - Schematics
3/2/2018

LTC3351EUFF Demo Board | Hot Swappable Supercapacitor Charger, Backup Controller and System Monitor (12V Nominal Input, 6V 25W Backup)

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Product Details

Demonstration circuit 2464A-A/2464A-B is a supercapacitor charger and backup controller with a hot swappable front end plus supercapacitor health and system monitoring; featuring the LTC3351. The LTC3351 includes a buck supercapacitor charger and a backup boost controller. It has dual input hot swap FETs to control the inrush current when connected and to disconnect the input supply when an over current fault or input power loss occurs. An output ideal diode allows the supercapacitors to supply the output when V_CAP is above the set backup voltage. As the capacitor stack voltage drops down to the set output voltage, the LTC3351 will operate as a boost regulator to supply the output until the energy in the supercapacitors is depleted.