LTC3355
20V 1A Buck DC/DC with Integrated SCAP Charger and Backup Regulator
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Overview
Features and Benefits
- VIN Voltage Range: 3V to 20V
- VOUT Voltage Range: 2.7V to 5V
- 1A Current Mode Buck Main Regulator
- 5A Boost Backup Regulator Powered from Single Supercapacitor
- Boost Regulator Operates Down to 0.5V for Maximum Utilization of Supercapacitor Energy
- Programmable Supercapacitor Charge Current to 1A with Overvoltage Protection
- Charger Supports Single Cell CC/CV Battery Charging
- Programmable VIN Current Limit
- Programmable Boost Current Limit
- VIN Power Fail Indicator
- VCAP Power Good Indicator
- VOUT Power On Reset Output
- Compact 20-Lead 4mm × 4mm QFN Package
Product Details
The LTC3355 is a complete input power interrupt ride-through DC/DC system. The part charges a supercapacitor while delivering load current to VOUT, and uses energy from the supercapacitor to provide continuous VOUT backup power when VIN power is lost. The LTC3355 contains a nonsynchronous constant frequency current mode monolithic 1A buck switching regulator to provide a 2.7V to 5V regulated output voltage from an input supply of up to 20V.
A 1A programmable CC/CV linear charger charges the supercapacitor from VOUT. When the VIN supply drops below the PFI threshold, the devices’s constant frequency nonsynchronous current mode 5A boost switching regulator delivers power from the supercapacitor to VOUT. A thermal regulation loop maximizes charge current while limiting the die temperature to 110°C. The IC has boost, charger and VIN programmable current limits. The LTC3355 is available in a 20-lead 4mm × 4mm QFN surface mount package.
Applications
- Ride-Through “Dying Gasp” Supplies
- Power Meters/Industrial Alarms/Solid State Drives
Product Categories
Product Lifecycle
Recommended for New Designs
This product has been released to the market. The data sheet contains all final specifications and operating conditions. For new designs, ADI recommends utilization of these products.
Evaluation Kits (1)
Documentation & Resources
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R526 Reliability Data3/26/2018
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DC2040A - Demo Manual3/17/2014
Tools & Simulations
LTspice
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.
Models for the following parts are available in LTspice:
LTC3355
Software and Simulation
XLSX
LTC3355 Backup Time Calculator
29.44 K
Product Recommendations
LTC3355 Companion Parts
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Design Resources
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 Number | Material Declaration | Reliability Data | Pin/Package Drawing | CAD Symbols, Footprints & 3D Models |
|---|---|---|---|---|
| LTC3355EUF#PBF | Material Declaration | Reliability Data | 20-Lead QFN (4mm x 4mm x 0.75mm w/ EP) | |
| LTC3355EUF#TRPBF | Material Declaration | Reliability Data | 20-Lead QFN (4mm x 4mm x 0.75mm w/ EP) | |
| LTC3355IUF#PBF | Material Declaration | Reliability Data | 20-Lead QFN (4mm x 4mm x 0.75mm w/ EP) | |
| LTC3355IUF#TRPBF | Material Declaration | Reliability Data | 20-Lead QFN (4mm x 4mm x 0.75mm w/ EP) | |
| Wafer Fabrication Data | R526 Reliability Data |
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Evaluation Boards
Pricing displayed is based on 1-piece.
Up to two boards can be purchased through Analog.com. To order more than two, please purchase through one of our listed distributors.
Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.