LTC1149
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LTC1149

High Efficiency Synchronous Step-Down Switching Regulators

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LTspice LTC1149 - Step-Down (Buck) Regulators Download 3.92 KB
Part Models 9
1ku List Price Starting From $6.96
Features
  • Operation to 48V Input Voltage
  • Ultrahigh Efficiency: Up to 95%
  • Current Mode Operation for Excellent Line and Load Transient Response
  • High Efficiency Maintained over Wide Current Range
  • Logic-Controlled Micropower Shutdown
  • Short-Circuit Protection
  • Very Low Dropout Operation: 100% Duty Cycle
  • Synchronous FET Switching for High Efficiency
  • Adaptive Nonoverlap Gate Drives
  • Available in 16-Pin Narrow SO Package
Additional Details
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The LTC1149 series is a family of synchronous step down switching regulator controllers featuring automatic Burst Mode™ operation to maintain high efficiencies at low output currents. These devices drive external complementary power MOSFETs at switching frequencies up to 250kHz using a constant off-time current-mode architecture.

Special onboard regulation and level-shift circuitry allow operation at input voltages from dropout to 48V (60V absolute max). The constant off-time architecture maintains constant ripple current in the inductor, easing the design of wide input range converters. Current mode operation provides excellent line and load transient response. The operating current level is user-programmable via an external current sense resistor.

The LTC1149 series incorporates automatic power saving Burst Modeoperation when load currents drop below the level required for continuous operation. Standby power is reduced to only about 8mW at VIN = 12V. In shutdown, both MOSFETs are turned off.

Applications

  • Notebook and Palmtop Computers
  • Portable Instruments
  • Battery-Operated Digital Devices
  • Industrial Power Distribution
  • Avionics Systems
  • Telecom Power Supplies
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LTspice LTC1149 - Step-Down (Buck) Regulators Download 3.92 KB
Part Models 9
1ku List Price Starting From $6.96
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LTC1149

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Data Sheet

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UPDATED 08/22/2007
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LTC1149: High Efficiency Synchronous Step-Down Switching Regulators 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

21.11 K

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Design Note

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UPDATED 03/21/2014
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DN68 - New Synchronous Stepdown Switching Regulators Achieve 95% Efficiency redirect icon

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UPDATED 03/21/2014
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DN77 - Single LTC1149 Provides 3.3V and 5V Surface Mount redirect icon

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UPDATED 03/01/1993
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Design Note 68: New Synchronous Stepdown Switching Regulators Achieve 95% Efficiency redirect icon

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UPDATED 07/01/1993
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Design Note 72: Single LTC1149 Delivers 3.3V and 5V at 17W redirect icon

Application Note

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

1.00M

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

253.00K

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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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Documentation

Documentation

Technical Documents 9
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Data Sheet 1

LTC1149: High Efficiency Synchronous Step-Down Switching Regulators 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 4

DN68 - New Synchronous Stepdown Switching Regulators Achieve 95% Efficiency
DN77 - Single LTC1149 Provides 3.3V and 5V Surface Mount
Design Note 68: New Synchronous Stepdown Switching Regulators Achieve 95% Efficiency
Design Note 72: Single LTC1149 Delivers 3.3V and 5V at 17W

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
LTC1149CN#PBF 16-Lead PDIP (Narrow 0.30 Inch) external-link
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  • Material Declaration external-link
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LTC1149CN-3.3#PBF 16-Lead PDIP (Narrow 0.30 Inch) external-link
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  • Material Declaration external-link
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LTC1149CN-5#PBF 16-Lead PDIP (Narrow 0.30 Inch) external-link
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  • Material Declaration external-link
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LTC1149CS#PBF 16-Lead SOIC (Narrow 0.15 Inch) external-link
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  • Material Declaration external-link
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LTC1149CS#TRPBF 16-Lead SOIC (Narrow 0.15 Inch) external-link
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  • Material Declaration external-link
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LTC1149CS-3.3#PBF 16-Lead SOIC (Narrow 0.15 Inch) external-link
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  • Material Declaration external-link
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LTC1149CS-3.3#TRPBF 16-Lead SOIC (Narrow 0.15 Inch) external-link
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  • Material Declaration external-link
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  • Reliablity Data external-link
LTC1149CS-5#PBF 16-Lead SOIC (Narrow 0.15 Inch) external-link
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  • Material Declaration external-link
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LTC1149CS-5#TRPBF 16-Lead SOIC (Narrow 0.15 Inch) external-link
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  • Material Declaration external-link
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Laser Top Mark Conversion for SOICN14 and SOICN16 Packages Assembled on ADPG [PNG]

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Aug 6, 2022

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

LTC1149CN#PBF

PRODUCTION

LTC1149CN-3.3#PBF

PRODUCTION

LTC1149CN-5#PBF

PRODUCTION

pdf

PCN22_0172_Form

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xls

Material_Report

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xlsm

Delta Qualification Matrix

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Aug 6, 2022

- 22_0173

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Laser Top Mark Conversion for SOICN14 and SOICN16 Packages Assembled on ADPG [PNG]

LTC1149CS#PBF

PRODUCTION

LTC1149CS#TRPBF

PRODUCTION

LTC1149CS-3.3#PBF

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LTC1149CS-3.3#TRPBF

PRODUCTION

LTC1149CS-5#PBF

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LTC1149CS-5#TRPBF

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pdf

PCN22_0173_Form

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xls

Material_Report

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xlsm

Delta Qualification Matrix

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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.

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