LTC1474

PRODUCTION

Low Quiescent Current High Efficiency Step-Down Converters

Part Models: 18
1ku List Price: Starting From $4.90

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Overview

High Efficiency: Over 92% Possible
Very Low Standby Current: 10µA Typ
Available in Space Saving 8-Lead MSOP Package
Internal 1.4Ω Power Switch (V_IN = 10V)
Wide V_IN Range: 3V to 18V Operation
Very Low Dropout Operation: 100% Duty Cycle
Low-Battery Detector Functional During Shutdown
Programmable Current Limit with Optional Current Sense Resistor (10mA to 400mA Typ)
Short-Circuit Protection
Few External Components Required
Active Low Micropower Shutdown: I_Q = 6µA Typ
Pushbutton On/Off (LTC1475 Only)
3.3V, 5V and Adjustable Output Versions

The LTC1474/LTC1475 series are high efficiency step-down converters with internal P-channel MOSFET power switches that draw only 10µA typical DC supply current at no load while maintaining output voltage. The LTC1474 uses logic-controlled shutdown while the LTC1475 features pushbutton on/off.

The low supply current coupled with Burst Mode^™ operation enables the LTC1474/LTC1475 to maintain high efficiency over a wide range of loads. These features, along with their capability of 100% duty cycle for low dropout and wide input supply range, make the LTC1474/LTC1475 ideal for moderate current (up to 300mA) battery-powered applications.

The peak switch current is user-programmable with an optional sense resistor (defaults to 325mA minimum if not used) providing a simple means for optimizing the design for lower current applications. The peak current control also provides short-circuit protection and excellent startup behavior. A low-battery detector that remains functional in shutdown is provided .

The LTC1474/LTC1475 series availability in 8-lead MSOP and SO packages and need for few additional components provide for a minimum area solution.

Applications

Cellular Telephones and Wireless Modems
4mA to 20mA Current Loop Step-Down Converter
Portable Instruments
Battery-Operated Digital Devices
Battery Chargers
Inverting Converters
Intrinsic Safety Applications

Part Models: 18
1ku List Price: Starting From $4.90

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
LTC1474CMS8#PBF	8-Lead MSOP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC1474CMS8#TRPBF	8-Lead MSOP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC1474CMS8-3.3#PBF	8-Lead MSOP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC1474CMS8-3.3#TRPBF	8-Lead MSOP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC1474CMS8-5#PBF	8-Lead MSOP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC1474CMS8-5#TRPBF	8-Lead MSOP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC1474CS8#PBF	8-Lead SOIC (Narrow 0.15 Inch)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC1474CS8#TRPBF	8-Lead SOIC (Narrow 0.15 Inch)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC1474CS8-3.3#PBF	8-Lead SOIC (Narrow 0.15 Inch)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC1474CS8-3.3#TRPBF	8-Lead SOIC (Narrow 0.15 Inch)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC1474CS8-5#PBF	8-Lead SOIC (Narrow 0.15 Inch)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC1474CS8-5#TRPBF	8-Lead SOIC (Narrow 0.15 Inch)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC1474IS8#PBF	8-Lead SOIC (Narrow 0.15 Inch)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC1474IS8#TRPBF	8-Lead SOIC (Narrow 0.15 Inch)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC1474IS8-3.3#PBF	8-Lead SOIC (Narrow 0.15 Inch)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC1474IS8-3.3#TRPBF	8-Lead SOIC (Narrow 0.15 Inch)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC1474IS8-5#PBF	8-Lead SOIC (Narrow 0.15 Inch)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC1474IS8-5#TRPBF	8-Lead SOIC (Narrow 0.15 Inch)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys

Part Models	Product Lifecycle	PCN

Jun 5, 2024 - 24_0004 Epoxy Change from Henkel 8290 to 8290A for MSOP (3)
		PCN24_0004_Form Material_Report Qualification Results Summary Delta Qualification Matrix
LTC1474CMS8#PBF	PRODUCTION
LTC1474CMS8#TRPBF	PRODUCTION
LTC1474CMS8-3.3#PBF	PRODUCTION
LTC1474CMS8-3.3#TRPBF	PRODUCTION
LTC1474CMS8-5#PBF	PRODUCTION
LTC1474CMS8-5#TRPBF	PRODUCTION
Feb 3, 2020 - 20_0128 Laser Top Mark for 8 Lead MSOP Packages Assembled in ADPG and UTAC
		PCN20_0128_Form Material_Report
LTC1474CMS8#PBF	PRODUCTION
LTC1474CMS8#TRPBF	PRODUCTION
LTC1474CMS8-3.3#PBF	PRODUCTION
LTC1474CMS8-3.3#TRPBF	PRODUCTION
LTC1474CMS8-5#PBF	PRODUCTION
LTC1474CMS8-5#TRPBF	PRODUCTION
Oct 24, 2024 - 24_0246 Migrating Bottom Trace Code Marking to Top Side Laser Marking for SOIC_N Package
		PCN24_0246_Form Material_Report Marking Comparison Delta Qualification Matrix
LTC1474CS8#PBF	PRODUCTION
LTC1474CS8#TRPBF	PRODUCTION
LTC1474CS8-3.3#PBF	PRODUCTION
LTC1474CS8-3.3#TRPBF	PRODUCTION
LTC1474CS8-5#PBF	PRODUCTION
LTC1474CS8-5#TRPBF	PRODUCTION
LTC1474IS8#PBF	PRODUCTION
LTC1474IS8#TRPBF	PRODUCTION
LTC1474IS8-3.3#PBF	PRODUCTION
LTC1474IS8-3.3#TRPBF	PRODUCTION
LTC1474IS8-5#PBF	PRODUCTION
LTC1474IS8-5#TRPBF	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
LTC1474CS8#PBF	PRODUCTION
LTC1474CS8#TRPBF	PRODUCTION
LTC1474CS8-3.3#PBF	PRODUCTION
LTC1474CS8-3.3#TRPBF	PRODUCTION
LTC1474CS8-5#PBF	PRODUCTION
LTC1474CS8-5#TRPBF	PRODUCTION
LTC1474IS8-3.3#PBF	PRODUCTION
LTC1474IS8-3.3#TRPBF	PRODUCTION
LTC1474IS8-5#PBF	PRODUCTION
LTC1474IS8-5#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
LTC1474CS8#PBF	PRODUCTION
LTC1474CS8#TRPBF	PRODUCTION
LTC1474CS8-3.3#PBF	PRODUCTION
LTC1474CS8-3.3#TRPBF	PRODUCTION
LTC1474CS8-5#PBF	PRODUCTION
LTC1474CS8-5#TRPBF	PRODUCTION
LTC1474IS8#PBF	PRODUCTION
LTC1474IS8#TRPBF	PRODUCTION
LTC1474IS8-3.3#PBF	PRODUCTION
LTC1474IS8-3.3#TRPBF	PRODUCTION
LTC1474IS8-5#PBF	PRODUCTION
LTC1474IS8-5#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
LTC1474IS8#PBF	PRODUCTION
LTC1474IS8#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:

LTC1474
LTC1474-3.3
LTC1474-5

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.