LTC1147

PRODUCTION

High Efficiency Step-Down Switching Regulator Controllers

Part Models: 18
1ku List Price: Starting From $3.70

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Overview

Very High Efficiency: Over 95% Possible
Wide V_IN 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: I_Q <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

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 R_DS(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 V_IN = 10V (at I_OUT = 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

Part Models: 18
1ku List Price: Starting From $3.70

Documentation

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)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC1147CN8-5#PBF	8-Lead PDIP (Narrow 0.3 Inch)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC1147CS8-3.3#PBF	8-Lead SOIC (Narrow 0.15 Inch)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC1147CS8-3.3#TRPBF	8-Lead SOIC (Narrow 0.15 Inch)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC1147CS8-5#PBF	8-Lead SOIC (Narrow 0.15 Inch)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC1147CS8-5#TRPBF	8-Lead SOIC (Narrow 0.15 Inch)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC1147HVCS8-3.3#PBF	8-Lead SOIC (Narrow 0.15 Inch)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC1147HVCS8-3.3#TRPBF	8-Lead SOIC (Narrow 0.15 Inch)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC1147IS8-3.3#PBF	8-Lead SOIC (Narrow 0.15 Inch)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC1147IS8-3.3#TRPBF	8-Lead SOIC (Narrow 0.15 Inch)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC1147IS8-5#PBF	8-Lead SOIC (Narrow 0.15 Inch)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC1147IS8-5#TRPBF	8-Lead SOIC (Narrow 0.15 Inch)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC1147LCS8#PBF	8-Lead SOIC (Narrow 0.15 Inch)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC1147LCS8#TRPBF	8-Lead SOIC (Narrow 0.15 Inch)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC1147LCS8-3.3#PBF	8-Lead SOIC (Narrow 0.15 Inch)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC1147LCS8-3.3#TRPBF	8-Lead SOIC (Narrow 0.15 Inch)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC1147LIS8#PBF	8-Lead SOIC (Narrow 0.15 Inch)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC1147LIS8#TRPBF	8-Lead SOIC (Narrow 0.15 Inch)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys

Part Models	Product Lifecycle	PCN

Oct 8, 2024 - 24_0234 Migrating Bottom Trace Code Marking to Top Side Laser Marking for PDIP Package
		PCN24_0234_Form Material_Report Marking Comparison
LTC1147CN8-3.3#PBF	PRODUCTION
LTC1147CN8-5#PBF	PRODUCTION
Oct 11, 2022 - 22_0241 Epoxy Change from Henkel 8290 to 8290A for PDIP Package
		PCN22_0241_Form Material_Report Qualification Results Summary
LTC1147CN8-3.3#PBF	PRODUCTION
LTC1147CN8-5#PBF	PRODUCTION
Aug 6, 2022 - 22_0172 Laser Top Mark Conversion for PDIP Packages Assembled in ADPG [PNG]
		PCN22_0172_Form Material_Report Delta Qualification Matrix
LTC1147CN8-3.3#PBF	PRODUCTION
LTC1147CN8-5#PBF	PRODUCTION
Dec 14, 2023 - 22_0255 Epoxy Change from Henkel 8290 to 8290A for 8-Lead SOIC Package (PCN part 2 of 2)
		PCN22_0255_Form Material_Report Qualification Results Summary Delta Qualification Matrix
LTC1147CS8-3.3#PBF	PRODUCTION
LTC1147CS8-3.3#TRPBF	PRODUCTION
LTC1147CS8-5#PBF	PRODUCTION
LTC1147CS8-5#TRPBF	PRODUCTION
LTC1147IS8-3.3#PBF	PRODUCTION
LTC1147IS8-3.3#TRPBF	PRODUCTION
LTC1147IS8-5#PBF	PRODUCTION
LTC1147IS8-5#TRPBF	PRODUCTION
LTC1147LCS8#PBF	PRODUCTION
LTC1147LCS8#TRPBF	PRODUCTION
LTC1147LCS8-3.3#PBF	PRODUCTION
LTC1147LCS8-3.3#TRPBF	PRODUCTION
LTC1147LIS8#PBF	PRODUCTION
LTC1147LIS8#TRPBF	PRODUCTION
Jun 16, 2021 - 21_0026 Laser Top Mark for 8SOICN Assembled in ADPG, UTL and CRM
		PCN21_0026_Form Material_Report Delta Qualification Matrix
LTC1147CS8-3.3#PBF	PRODUCTION
LTC1147CS8-3.3#TRPBF	PRODUCTION
LTC1147CS8-5#PBF	PRODUCTION
LTC1147CS8-5#TRPBF	PRODUCTION
LTC1147IS8-3.3#PBF	PRODUCTION
LTC1147IS8-3.3#TRPBF	PRODUCTION
LTC1147IS8-5#PBF	PRODUCTION
LTC1147IS8-5#TRPBF	PRODUCTION
LTC1147LCS8#PBF	PRODUCTION
LTC1147LCS8#TRPBF	PRODUCTION
LTC1147LCS8-3.3#PBF	PRODUCTION
LTC1147LCS8-3.3#TRPBF	PRODUCTION
LTC1147LIS8#PBF	PRODUCTION
LTC1147LIS8#TRPBF	PRODUCTION
Oct 12, 2022 - 22_0255 Epoxy Change from Henkel 8290 to 8290A for 8-Lead SOIC Package (PCN part 2 of 2)
		PCN22_0255_Form Material_Report Qualification Results Summary Delta Qualification Matrix
LTC1147HVCS8-3.3#PBF	PRODUCTION
LTC1147HVCS8-3.3#TRPBF	PRODUCTION
Nov 11, 2021 - 21_0060 Laser Top Mark for 8SOICN Assembled in ADPG, UTL and CRM
		PCN21_0060_Form Material_Report Delta Qualification Matrix
LTC1147HVCS8-3.3#PBF	PRODUCTION
LTC1147HVCS8-3.3#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:

LTC1147-3.3
LTC1147-5
LTC1147L
LTC1147L-3.3

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.