LTC1771

PRODUCTION

10µA Quiescent Current High Efficiency Step-Down DC/DC Controller

Part Models: 6
1ku List Price: Starting From $3.34

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Overview

Very Low Standby Current: 10µA
Available in Space-Saving 8-Lead MSOP Package
Output Currents: Up to 5A
Wide V_IN Range: 2.8V to 20V Operation
V_OUT Range: 1.23V to 18V
High Efficiency: Over 93% Possible
±2% Output Accuracy
Very Low Dropout Operation: 100% Duty Cycle
Current Mode Operation for Excellent Line and Load Transient Response
Defeatable Burst Mode^™ Operation
Short-Circuit Protected
Optional Programmable Soft-Start
Micropower Shutdown: I_Q = 2µA

The LTC1771 is a high efficiency current mode step-down DC/DC controller that draws as little as 10µA DC supply current to regulate the output at no load while maintaining high efficiency for loads up to several amps.

The LTC1771 drives an external P-channel power MOSFET using a current mode, constant off-time architecture. An external sense resistor is used to program the operating current level. Current mode control provides short-circuit protection, excellent transient response and controlled start-up behavior. Burst Mode operation enables the LTC1771 to maintain high efficiency down to extremely low currents. Shutdown mode further reduces the supply current to a mere 2µA. For low noise applications, Burst Mode operation can be easily disabled with the MODE pin.

Wide input supply range of 2.8V to 18V (20V maximum) and 100% duty cycle operation for low dropout make the LTC1771 ideal for a wide variety of battery-powered applications where maximizing battery life is important.

The LTC1771’s availability in both 8-lead MSOP and SO packages provides for a minimum area solution.

Applications

Cellular Telephones and Wireless Modems
1- to 4-Cell Lithium-Ion-Powered Applications
Portable Instruments
Battery-Powered Equipment
Battery Chargers
Scanners

Part Models: 6
1ku List Price: Starting From $3.34

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
LTC1771EMS8#PBF	8-Lead MSOP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC1771EMS8#TRPBF	8-Lead MSOP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC1771ES8#PBF	8-Lead SOIC (Narrow 0.15 Inch)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC1771ES8#TRPBF	8-Lead SOIC (Narrow 0.15 Inch)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC1771IS8#PBF	8-Lead SOIC (Narrow 0.15 Inch)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LTC1771IS8#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
LTC1771EMS8#PBF	PRODUCTION
LTC1771EMS8#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
LTC1771EMS8#PBF	PRODUCTION
LTC1771EMS8#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
LTC1771ES8#PBF	PRODUCTION
LTC1771ES8#TRPBF	PRODUCTION
LTC1771IS8#PBF	PRODUCTION
LTC1771IS8#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
LTC1771ES8#PBF	PRODUCTION
LTC1771ES8#TRPBF	PRODUCTION
LTC1771IS8#PBF	PRODUCTION
LTC1771IS8#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
LTC1771ES8#PBF	PRODUCTION
LTC1771ES8#TRPBF	PRODUCTION
LTC1771IS8#PBF	PRODUCTION
LTC1771IS8#TRPBF	PRODUCTION

This is the most up-to-date revision of the Data Sheet.

Software Resources

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Hardware Ecosystem

Parts	Product Life Cycle	Description
Circuit Monitors 1
LTC2960	RECOMMENDED FOR NEW DESIGNS	36V Nano-Current Two-Input Voltage Monitor
Protection Switches & Controllers 2
LTC2955	RECOMMENDED FOR NEW DESIGNS	Pushbutton On/Off Controller with Automatic Turn-On
LTC4365	RECOMMENDED FOR NEW DESIGNS	Overvoltage, Undervoltage and Reverse Supply Protection Controller

Tools & Simulations

LTspice

Models for the following parts are available in LTspice:

LTC1771

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.

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Overview

Documentation

Data Sheet 1

Reliability Data 1

Design Note 1

Technical Articles 2