LTC1148
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LTC1148

High Efficiency Synchronous Step-Down Switching Regulators

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Part Models 24
1ku List Price Starting From $6.36
Features
  • Ultra-High Efficiency: Over 95% Possible
  • 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
  • Wide VIN Range: 3.5V to 20V
  • Short-Circuit Protection
  • Very Low Dropout Operation: 100% Duty Cycle
  • Synchronous FET Switching for High Efficiency
  • Adaptive Nonoverlap Gate Drives
  • Output Can Be Externally Held High in Shutdown
  • Available in 14-Pin Narrow SO Package
Additional Details
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The LTC1148 series is a family of synchronous stepdown 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 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 18V (20V 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 LTC1148 series combines synchronous switching for maximum efficiency at high currents with an automatic low current operating mode, called Burst Mode operation, which reduces switching losses. 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 operation up to 48V input, see the LTC1149 and LTC1159 data sheets 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 LTC1148 - Step-Down (Buck) Regulators Download 2.43 KB LTspice LTC1148 - Step-Down (Buck) Regulators Download 2.78 KB
Part Models 24
1ku List Price Starting From $6.36
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LTC1148

Documentation

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Data Sheet

1

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UPDATED 08/24/2007
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LTC1148: 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

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Application Note

4

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UPDATED 08/20/2007
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AN60 - PCMCIA Card and Card Socket Power Management: redirect icon

253.00K

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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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Design Note

9

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UPDATED 03/26/2014
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DN82 - 5V to 3.3V Regulator with Fail-Safe Switchover redirect icon

72.00K

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

79.00K

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UPDATED 03/21/2014
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DN90 - High Efficiency Power Sources for Pentium TM Processors redirect icon

83.00K

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

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UPDATED 11/01/1994
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Design Note 91: 5V to 3.3V Circuit Collection 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

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UPDATED 11/24/2023
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Design Note 82: 5V to 3.3V Regulator with Fail-Safe Switchover redirect icon

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UPDATED 05/01/1995
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Design Note 103: New LTC1266 Switching Regulator Provides High Efficiency at 10A Loads redirect icon

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Documentation

Technical Documents 15
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Data Sheet 1

LTC1148: High Efficiency Synchronous Step-Down Switching Regulators Data Sheet

Reliability Data 1

R245 Reliability Data

Application Note 4

AN60 - PCMCIA Card and Card Socket Power Management:
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 9

DN82 - 5V to 3.3V Regulator with Fail-Safe Switchover
DN68 - New Synchronous Stepdown Switching Regulators Achieve 95% Efficiency
DN90 - High Efficiency Power Sources for Pentium TM Processors
Design Note 68: New Synchronous Stepdown Switching Regulators Achieve 95% Efficiency
Design Note 74: Techniques for Deriving 3.3V from 5V Supplies
Design Note 91: 5V to 3.3V Circuit Collection
Design Note 72: Single LTC1149 Delivers 3.3V and 5V at 17W
Design Note 82: 5V to 3.3V Regulator with Fail-Safe Switchover
Design Note 103: New LTC1266 Switching Regulator Provides High Efficiency at 10A Loads

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
LTC1148CN#PBF 14-Lead PDIP (Narrow 0.3 Inch) external-link
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LTC1148HVCN#PBF 14-Lead PDIP (Narrow 0.3 Inch) external-link
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LTC1148HVCN-3.3#PBF 14-Lead PDIP (Narrow 0.3 Inch) external-link
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LTC1148HVCN-5#PBF 14-Lead PDIP (Narrow 0.3 Inch) external-link
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LTC1148HVCS#PBF 14-Lead SOIC (Narrow 0.15 Inch) external-link
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LTC1148HVCS#TRPBF 14-Lead SOIC (Narrow 0.15 Inch) external-link
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LTC1148HVCS-3.3#PBF 14-Lead SOIC (Narrow 0.15 Inch) external-link
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LTC1148HVCS-3.3#TRPBF 14-Lead SOIC (Narrow 0.15 Inch) external-link
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LTC1148HVCS-5#PBF 14-Lead SOIC (Narrow 0.15 Inch) external-link
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LTC1148HVCS-5#TRPBF 14-Lead SOIC (Narrow 0.15 Inch) external-link
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LTC1148HVIS-5#PBF 14-Lead SOIC (Narrow 0.15 Inch) external-link
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LTC1148HVIS-5#TRPBF 14-Lead SOIC (Narrow 0.15 Inch) external-link
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LTC1148LCS#PBF 14-Lead SOIC (Narrow 0.15 Inch) external-link
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LTC1148LCS#TRPBF 14-Lead SOIC (Narrow 0.15 Inch) external-link
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LTC1148LCS-3.3#PBF 14-Lead SOIC (Narrow 0.15 Inch) external-link
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LTC1148LCS-3.3#TRPBF 14-Lead SOIC (Narrow 0.15 Inch) external-link
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Oct 11, 2022

- 22_0241

Epoxy Change from Henkel 8290 to 8290A for PDIP Package

LTC1148CN#PBF

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Aug 6, 2022

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

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Oct 12, 2022

- 22_0251

Epoxy Change from Henkel 8290 to 8290A for 14-Lead SOIC Package

LTC1148CS#PBF

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PCN22_0251_Form

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Qualification Results Summary

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Aug 6, 2022

- 22_0173

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

LTC1148CS#PBF

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Oct 11, 2022

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Epoxy Change from Henkel 8290 to 8290A for PDIP Package

LTC1148CN#PBF

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LTC1148CN-3.3#PBF

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LTC1148CN-5#PBF

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PCN22_0241_Form

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Aug 6, 2022

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

LTC1148CN#PBF

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LTC1148CN-5#PBF

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LTC1148HVCN#PBF

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PCN22_0172_Form

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Material_Report

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Delta Qualification Matrix

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Oct 12, 2022

- 22_0251

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Epoxy Change from Henkel 8290 to 8290A for 14-Lead SOIC Package

LTC1148CS#PBF

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LTC1148CS#TRPBF

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LTC1148CS-3.3#PBF

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PCN22_0251_Form

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Material_Report

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Qualification Results Summary

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Aug 6, 2022

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

LTC1148CS#PBF

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Software & Part Ecosystem

Evaluation Kits 3

DC025A-C

LTC1148CS-3.3 | Ultra High Efficiency Buck 3.3V/1A (Fixed 3.3V)

DC025A-A

LTC1148CS | Ultra High Efficiency Buck 5V/2A (Adjustable)

DC025A-D

LTC1148CS-3.3 | Ultra High Efficiency Buck 3.3V/2A (Fixed 3.3V)

Evaluation Kits3

DC025A-C

LTC1148CS-3.3 | Ultra High Efficiency Buck 3.3V/1A (Fixed 3.3V)

DC025A-A

LTC1148CS | Ultra High Efficiency Buck 5V/2A (Adjustable)

DC025A-D

LTC1148CS-3.3 | Ultra High Efficiency Buck 3.3V/2A (Fixed 3.3V)

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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LTC1148 - Step-Down (Buck) Regulators Download

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LTC1148 - Step-Down (Buck) Regulators Download

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