LTC3355
RECOMMENDED FOR NEW DESIGNS20V 1A Buck DC/DC with Integrated SCAP Charger and Backup Regulator
- Part Models
- 4
- 1ku List Price
- Starting From $4.92
Overview
- 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
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
Documentation
Data Sheet 1
User Guide 1
Technical Articles 1
Video 1
Book & eBook 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 |
|---|---|---|---|
| LTC3355EUF#PBF | 20-Lead QFN (4mm x 4mm x 0.75mm w/ EP) | ||
| LTC3355EUF#TRPBF | 20-Lead QFN (4mm x 4mm x 0.75mm w/ EP) | ||
| LTC3355IUF#PBF | 20-Lead QFN (4mm x 4mm x 0.75mm w/ EP) | ||
| LTC3355IUF#TRPBF | 20-Lead QFN (4mm x 4mm x 0.75mm w/ EP) |
| Part Models | Product Lifecycle | PCN |
|---|---|---|
|
Feb 20, 2022 - 21_0269 Addition of Alternate Assembly Site ASE Taiwan for Select LFCSP Products |
||
| LTC3355EUF#PBF | PRODUCTION | |
| LTC3355EUF#TRPBF | PRODUCTION | |
| LTC3355IUF#PBF | PRODUCTION | |
| LTC3355IUF#TRPBF | PRODUCTION | |
|
Dec 3, 2020 - 20_0245 Notification of Wafer Fab Location Change for 0.6µm BICMOS Process Devices from ADI Milpitas (Hillview) to Vanguard Int. (Taiwan) |
||
| LTC3355EUF#PBF | PRODUCTION | |
| LTC3355EUF#TRPBF | PRODUCTION | |
| LTC3355IUF#PBF | PRODUCTION | |
| LTC3355IUF#TRPBF | PRODUCTION | |
This is the most up-to-date revision of the Data Sheet.
Software Resources
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Tools & Simulations
LTspice
Models for the following parts are available in LTspice:
- LTC3355
Software and Simulation 1
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
LTC3355EUF Demo Board | 12V to 4V/1A Buck Regulator + SCAP Charger & Backup Boost Regulator