LTC3350

RECOMMENDED FOR NEW DESIGNS

High Current Supercapacitor Backup Controller and System Monitor

Data Sheet (Rev. D) Product Selection Table

Part Models: 6
1ku List Price: Starting From $5.15

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Overview

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

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

Part Models: 6
1ku List Price: Starting From $5.15

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

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

Software Resources

Evaluation Software 1

LTC3350/LTC3351 Software

LTC3350_SDK.zip (Rev. )

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Hardware Ecosystem

Parts	Product Life Cycle	Description
Protection Switches & Controllers 1
LTC4353	RECOMMENDED FOR NEW DESIGNS	Dual Low Voltage Ideal Diode Controller
Switching Regulators & Controllers 1
LTC3110	RECOMMENDED FOR NEW DESIGNS	2A Bidirectional Buck-Boost DC/DC Regulator and Charger/Balancer

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

Tools & Simulations

LTspice

Models for the following parts are available in LTspice:

LTC3350

Software and Simulation 1

LTC3350 Backup Time Calculator

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

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

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Product Details

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

DC1937B - Design Files
7/13/2015

DC1937B - Schematic
7/13/2015

DC1937B - Demo Manual
12/15/2015

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LTC3350

Overview

Documentation

Data Sheet 1

Reliability Data 1

User Guide 1

Technical Articles 2

Product Selector Card 1

Book & eBook 1

Rarely Asked Question Page 1