LTC3351
RECOMMENDED FOR NEW DESIGNSHot Swappable Supercapacitor Charger, Backup Controller and System Monitor
- Part Models
- 4
- 1ku List Price
- Starting From $8.63
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
- VIN: 4.5V to 35V, VCAP(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
Documentation
Data Sheet 1
User Guide 1
Technical Articles 1
Spec Notice 1
Rarely Asked Question 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 |
|---|---|---|---|
| LTC3351EUFF#PBF | 44-Lead DFN (4mm x 7mm w/ EP) | ||
| LTC3351EUFF#TRPBF | 44-Lead DFN (4mm x 7mm w/ EP) | ||
| LTC3351IUFF#PBF | 44-Lead DFN (4mm x 7mm w/ EP) | ||
| LTC3351IUFF#TRPBF | 44-Lead DFN (4mm x 7mm w/ EP) |
| Part Models | Product Lifecycle | PCN |
|---|---|---|
|
Mar 26, 2019 - 19_0070 LTC3351 Data Sheet Specification Change |
||
| 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
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Hardware Ecosystem
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)
Resources
LTC3351EUFF Demo Board | Hot Swappable Supercapacitor Charger, Backup Controller and System Monitor (12V Nominal Input, 6V 25W Backup)