LTC3355
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LTC3355

20V 1A Buck DC/DC with Integrated SCAP Charger and Backup Regulator

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Software and Simulation LTC3355 Backup Time Calculator Download 29.44 KB LTspice LTC3355 - Power Management Download 3.71 KB
Part Models 4
1ku List Price Starting From $3.89
Features
  • 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
Additional Details
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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
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file View Data Sheet
Documentation View All Documentation
Software and Simulation LTC3355 Backup Time Calculator Download 29.44 KB LTspice LTC3355 - Power Management Download 3.71 KB
Part Models 4
1ku List Price Starting From $3.89
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LTC3355

Documentation

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Data Sheet

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UPDATED 04/30/2015
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LTC3355: 20V 1A Buck DC/DC with Integrated SCAP Charger and Backup Regulator Data Sheet

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UPDATED 12/07/2015
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LTC3355: SCAPチャージャとバックアップ・レギュレータを内蔵した20V/1A降圧DC/DCシステム データシート

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User Guide

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UPDATED 03/17/2014
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DC2040A - Demo Manual redirect icon

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Reliability Data

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UPDATED 03/26/2018
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R526 Reliability Data redirect icon

365.77 K

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Technical Articles

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UPDATED 09/01/2018
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Got Backup? Maintain Power Continuity redirect icon

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UPDATED 09/01/2018
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需要备用电源？保持电源连续性 redirect icon

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UPDATED 09/01/2018
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バックアップ電源により、給電の途絶を回避する redirect icon

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Documentation

Book & eBook 1

Power You Can Trust: Achieving Efficient Battery-Powered Solutions

Rarely Asked Question Page 1

Energy Storage Using Supercapacitors: How Big Is Big Enough?

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1

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2023-12-21

01:14

Smart Meter Portfolio

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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) external-link
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  • Material Declaration external-link
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LTC3355EUF#TRPBF 20-Lead QFN (4mm x 4mm x 0.75mm w/ EP) external-link
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  • Material Declaration external-link
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  • Reliablity Data external-link
LTC3355IUF#PBF 20-Lead QFN (4mm x 4mm x 0.75mm w/ EP) external-link
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  • Material Declaration external-link
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  • Reliablity Data external-link
LTC3355IUF#TRPBF 20-Lead QFN (4mm x 4mm x 0.75mm w/ EP) external-link
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  • Material Declaration external-link
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  • Reliablity Data external-link

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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

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PCN21_0269_Form

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Material_Report

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Detailed Change Description

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Qualification Results Summary

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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

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LTC3355IUF#PBF

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LTC3355IUF#TRPBF

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PCN20_0245_Form

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Material_Report

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Delta Qualification Matrix

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Qualification Results Summary

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PCN

Feb 20, 2022

- 21_0269

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Addition of Alternate Assembly Site ASE Taiwan for Select LFCSP Products

LTC3355EUF#PBF

PRODUCTION

LTC3355EUF#TRPBF

PRODUCTION

LTC3355IUF#PBF

PRODUCTION

LTC3355IUF#TRPBF

PRODUCTION

pdf

PCN21_0269_Form

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xls

Material_Report

Download

pdf

Detailed Change Description

external-icon

pdf

Qualification Results Summary

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Dec 3, 2020

- 20_0245

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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

pdf

PCN20_0245_Form

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xls

Material_Report

Download

xlsm

Delta Qualification Matrix

Download

pdf

Other

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pdf

Qualification Results Summary

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Software & Part Ecosystem

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Evaluation Kits 1

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DC2040A

LTC3355EUF Demo Board | 12V to 4V/1A Buck Regulator + SCAP Charger & Backup Boost Regulator

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DC2040A

LTC3355EUF Demo Board | 12V to 4V/1A Buck Regulator + SCAP Charger & Backup Boost Regulator

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DC2040A
LTC3355EUF Demo Board | 12V to 4V/1A Buck Regulator + SCAP Charger & Backup Boost Regulator
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Product Detail

Demonstration circuit 2040A is a 12V to 4V/1A regulator with an integrated supercap charger and backup boost regulator featuring the LTC3355EUF. The LTC3355 charges up a 3F supercapacitor from the output when the 12V input is available. When the 12V input fails, the backup boost regulator supplies the output until the energy in the supercapacitor is depleted. Figure 2 illustrates how long a 3F supercapacitor can provide a 4W output when the input power fails (~600ms).


 


Resources

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DC2040A - Demo Manual Download

445.00K

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DC2040A - Design Files Download

1.00M

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DC2040A - Schematic Download

76.00K

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Evaluation Kits1

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DC2040A

LTC3355EUF Demo Board | 12V to 4V/1A Buck Regulator + SCAP Charger & Backup Boost Regulator

Tools & Simulations 2

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.

To launch ready-to-run LTspice demonstration circuits for this part:

Step 1: Download and install LTspice on your computer.

Step 2: Click on the link in the section below to download a demonstration circuit.

Step 3: If LTspice does not automatically open after clicking the link below, you can instead run the simulation by right clicking on the link and selecting “Save Target As.” After saving the file to your computer, start LTspice and open the demonstration circuit by selecting ‘Open’ from the ‘File’ menu.

spice tool Lt Spice

LTC3355 - Power Management Download

3.71 K

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