LTC1147
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LTC1147

High Efficiency Step-Down Switching Regulator Controllers

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LTspice LTC1147 - Step-Down (Buck) Regulators Download 2.53 KB LTspice LTC1147 - Step-Down (Buck) Regulators Download 2.31 KB
Part Models 18
1ku List Price Starting From $3.70
Features
  • Very High Efficiency: Over 95% Possible
  • Wide VIN Range: 3.5V to 16V
  • Current Mode Operation for Excellent Line and Load Transient Response
  • High Efficiency Maintained Over Three Decades of Output Current
  • Low 160µA Standby Current at Light Loads
  • Logic Controlled Micropower Shutdown: IQ <20µA
  • Short-Circuit Protection
  • Very Low Dropout Operation: 100% Duty Cycle
  • High Efficiency in a Small Amount of Board Space
  • Output Can Be Externally Held High in Shutdown
  • Available in 8-Pin SO Package
Additional Details
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The LTC1147 series are step-down switching regulator controllers featuring automatic BurstMode™ operation to maintain high efficiencies at low output currents. These devices drive an external P-channel power MOSFET at switching frequencies exceeding 400kHz using a constant off-time current mode architecture providing constant ripple current in the inductor.

The operating current level is user-programmable via an external current sense resistor. Wide input supply range allows operation from 3.5V to 14V (16V maximum). Constant off-time architecture provides low dropout regulation limited by only the RDS(ON) of the external MOSFET and resistance of the inductor and current sense resistor.

The LTC1147 series incorporates automatic power saving Burst Mode operation to reduce switching losses when load currents drop below the level required for continuous operation. Standby power is reduced to only 2mW at VIN = 10V (at IOUT = 0). Load currents in Burst Mode operation are typically 0mA to 300mA.

For applications where even higher efficiency is required, refer to the LTC1148 data sheet and Application Note 54.

Applications

  • Notebook and Palmtop Computers
  • Portable Instruments
  • Battery-Operated Digital Devices
  • Cellular Telephones
  • DC Power Distribution Systems
  • GPS Systems
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LTspice LTC1147 - Step-Down (Buck) Regulators Download 2.53 KB LTspice LTC1147 - Step-Down (Buck) Regulators Download 2.31 KB
Part Models 18
1ku List Price Starting From $3.70
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LTC1147

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Data Sheet

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UPDATED 08/28/2007
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LTC1147: High Efficiency Step-Down Switching Regulator Controllers Data Sheet

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Reliability Data

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UPDATED 03/22/2018
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R245 Reliability Data redirect icon

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Application Note

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UPDATED 08/20/2007
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AN66 - Linear Technology Magazine Circuit Collection, Volume II redirect icon

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UPDATED 08/20/2007
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AN51 - Power Conditioning for Notebook and Palmtop Systems redirect icon

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UPDATED 08/20/2007
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AN54 - Power Conversion from Milliamps to Amps at Ultra-High Efficiency (Up to 95%) redirect icon

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UPDATED 09/01/1993
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Design Note 74: Techniques for Deriving 3.3V from 5V Supplies redirect icon

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Documentation

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Data Sheet 1

LTC1147: High Efficiency Step-Down Switching Regulator Controllers Data Sheet

Reliability Data 1

R245 Reliability Data

Application Note 3

AN66 - Linear Technology Magazine Circuit Collection, Volume II
AN51 - Power Conditioning for Notebook and Palmtop Systems
AN54 - Power Conversion from Milliamps to Amps at Ultra-High Efficiency (Up to 95%)

Design Note 1

Design Note 74: Techniques for Deriving 3.3V from 5V Supplies

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
LTC1147CN8-3.3#PBF 8-Lead PDIP (Narrow 0.3 Inch) external-link
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LTC1147CN8-5#PBF 8-Lead PDIP (Narrow 0.3 Inch) external-link
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LTC1147CS8-3.3#PBF 8-Lead SOIC (Narrow 0.15 Inch) external-link
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LTC1147CS8-3.3#TRPBF 8-Lead SOIC (Narrow 0.15 Inch) external-link
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LTC1147CS8-5#PBF 8-Lead SOIC (Narrow 0.15 Inch) external-link
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LTC1147CS8-5#TRPBF 8-Lead SOIC (Narrow 0.15 Inch) external-link
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LTC1147HVCS8-3.3#PBF 8-Lead SOIC (Narrow 0.15 Inch) external-link
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LTC1147HVCS8-3.3#TRPBF 8-Lead SOIC (Narrow 0.15 Inch) external-link
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LTC1147IS8-3.3#PBF 8-Lead SOIC (Narrow 0.15 Inch) external-link
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LTC1147IS8-3.3#TRPBF 8-Lead SOIC (Narrow 0.15 Inch) external-link
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LTC1147IS8-5#PBF 8-Lead SOIC (Narrow 0.15 Inch) external-link
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LTC1147IS8-5#TRPBF 8-Lead SOIC (Narrow 0.15 Inch) external-link
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LTC1147LCS8#PBF 8-Lead SOIC (Narrow 0.15 Inch) external-link
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LTC1147LCS8#TRPBF 8-Lead SOIC (Narrow 0.15 Inch) external-link
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LTC1147LCS8-3.3#PBF 8-Lead SOIC (Narrow 0.15 Inch) external-link
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LTC1147LCS8-3.3#TRPBF 8-Lead SOIC (Narrow 0.15 Inch) external-link
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LTC1147LIS8#PBF 8-Lead SOIC (Narrow 0.15 Inch) external-link
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LTC1147LIS8#TRPBF 8-Lead SOIC (Narrow 0.15 Inch) external-link
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Oct 11, 2022

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Epoxy Change from Henkel 8290 to 8290A for PDIP Package

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Oct 12, 2022

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Epoxy Change from Henkel 8290 to 8290A for 8-Lead SOIC Package (PCN part 2 of 2)

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Nov 11, 2021

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Laser Top Mark for 8SOICN Assembled in ADPG, UTL and CRM

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Laser Top Mark Conversion for PDIP Packages Assembled in ADPG [PNG]

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Dec 14, 2023

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Epoxy Change from Henkel 8290 to 8290A for 8-Lead SOIC Package (PCN part 2 of 2)

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Jun 16, 2021

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Laser Top Mark for 8SOICN Assembled in ADPG, UTL and CRM

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LTC1147CS8-3.3#TRPBF

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Oct 12, 2022

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Epoxy Change from Henkel 8290 to 8290A for 8-Lead SOIC Package (PCN part 2 of 2)

LTC1147HVCS8-3.3#PBF

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PCN22_0255_Form

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Nov 11, 2021

- 21_0060

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Laser Top Mark for 8SOICN Assembled in ADPG, UTL and CRM

LTC1147HVCS8-3.3#PBF

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LTC1147HVCS8-3.3#TRPBF

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Software & Part Ecosystem

Software & Part Ecosystem

Tools & Simulations

Tools & Simulations 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.

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

LTC1147 - Step-Down (Buck) Regulators Download

2.53 K

spice tool Lt Spice

LTC1147 - Step-Down (Buck) Regulators Download

2.31 K

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