LTC3351
Info : RECOMMENDED FOR NEW DESIGNS
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LTC3351

Hot Swappable Supercapacitor Charger, Backup Controller and System Monitor

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Info : RECOMMENDED FOR NEW DESIGNS tooltip
Info : RECOMMENDED FOR NEW DESIGNS tooltip
Part Details
Part Models 4
1ku List Price Starting From $6.82
Features
  • 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
Additional Details
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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

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Documentation

Documentation

Part Model Pin/Package Drawing Documentation CAD Symbols, Footprints, and 3D Models
LTC3351EUFF#PBF
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LTC3351EUFF#TRPBF
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LTC3351IUFF#PBF
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LTC3351IUFF#TRPBF
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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

Filter by Model

reset

Reset Filters

Part Models

Product Lifecycle

PCN

Mar 26, 2019

- 19_0070

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LTC3351 Data Sheet Specification Change

LTC3351EUFF#PBF

PRODUCTION

LTC3351EUFF#TRPBF

PRODUCTION

LTC3351IUFF#PBF

PRODUCTION

LTC3351IUFF#TRPBF

PRODUCTION

Software & Part Ecosystem

Software & Part Ecosystem

Evaluation Kit

Evaluation Kits 2

reference details image

DC2464A-B

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

zoom

DC2464A-B

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

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

Product Detail

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 VCAP 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.

reference details image

DC2464A-A

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

zoom

DC2464A-A

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

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

Product Detail

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 VCAP 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.

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