LT1129

PRODUCTION

Micropower Low Dropout Regulators with Shutdown

Part Models: 44
1ku List Price: Starting From $3.17

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Overview

400mV Dropout Voltage
700mA Output Current
50μA Quiescent Current
No Protection Diodes Needed
Adjustable Output from 3.8V to 30V
3.3V and 5V Fixed Output Voltages
Controlled Quiescent Current in Dropout
Shutdown
16μA Quiescent Current in Shutdown
Stable with 3.3μF Output Capacitor
Reverse Battery Protection
No Reverse Output Current
Thermal Limiting
Surface Mount SOT-223 and DD-Pak Packages

The LT1129/LT1129-3.3/LT1129-5 are micropower low dropout regulators with shutdown. The devices are capable of supplying 700mA of output current with a dropout voltage of 400mV at maximum output. Designed for use in battery-powered systems, the low quiescent current, 50μA operating and 16μA in shutdown, make them an ideal choice. The quiescent current does not rise in dropout as it does with many other low dropout PNP regulators.

Other features of the LT1129/LT1129-3.3/LT1129-5 include the ability to operate with small output capacitors. They are stable with only 3.3μF on the output while most older devices require between 10μF and 100μF for stability. Also the input may be connected to ground or a reverse voltage without reverse current ﬂow from output to input. This makes the LT1129/LT1129-3.3/LT1129-5 ideal for backup power situations where the output is held high and the input is at ground or reversed. Under these conditions, only 16μA will ﬂow from the output pin to ground. The devices are available in 5-lead TO-220, 5-lead DD-Pak and 3-lead SOT-223 packages.

Applications

Low Current Regulator
Regulator for Battery-Powered Systems
Post Regulator for Switching Supplies
5V to 3.3V Logic Regulator

Part Models: 44
1ku List Price: Starting From $3.17

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
LT1129CQ#PBF	5-Lead DD Pak	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT1129CQ#TRPBF	5-Lead DD Pak	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT1129CQ-3.3#PBF	5-Lead DD Pak	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT1129CQ-3.3#TRPBF	5-Lead DD Pak	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT1129CQ-5#PBF	5-Lead DD Pak	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT1129CQ-5#TRPBF	5-Lead DD Pak	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT1129CS8#PBF	8-Lead SOIC (Narrow 0.15 Inch)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT1129CS8#TRPBF	8-Lead SOIC (Narrow 0.15 Inch)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT1129CS8-3.3#PBF	8-Lead SOIC (Narrow 0.15 Inch)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT1129CS8-3.3#TRPBF	8-Lead SOIC (Narrow 0.15 Inch)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT1129CS8-5#PBF	8-Lead SOIC (Narrow 0.15 Inch)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT1129CS8-5#TRPBF	8-Lead SOIC (Narrow 0.15 Inch)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT1129CST-3.3#PBF	3-Lead SOT-223	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT1129CST-3.3#TRPBF	3-Lead SOT-223	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT1129CST-5#PBF	3-Lead SOT-223	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT1129CST-5#TRPBF	3-Lead SOT-223	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT1129CT#PBF	5-Lead TO-220	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT1129CT-3.3#06PBF	5-Lead TO-220 (Flow 06)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT1129CT-3.3#PBF	5-Lead TO-220	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT1129CT-5#06PBF	5-Lead TO-220 (Flow 06)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT1129CT-5#PBF	5-Lead TO-220	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT1129IQ#PBF	5-Lead DD Pak	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT1129IQ#TRPBF	5-Lead DD Pak	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT1129IQ-3.3#PBF	5-Lead DD Pak	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT1129IQ-3.3#TRPBF	5-Lead DD Pak	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT1129IQ-5#PBF	5-Lead DD Pak	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT1129IQ-5#TRPBF	5-Lead DD Pak	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT1129IS8#PBF	8-Lead SOIC (Narrow 0.15 Inch)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT1129IS8#TRPBF	8-Lead SOIC (Narrow 0.15 Inch)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT1129IS8-3.3#PBF	8-Lead SOIC (Narrow 0.15 Inch)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT1129IS8-3.3#TRPBF	8-Lead SOIC (Narrow 0.15 Inch)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT1129IS8-5#PBF	8-Lead SOIC (Narrow 0.15 Inch)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT1129IS8-5#TRPBF	8-Lead SOIC (Narrow 0.15 Inch)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT1129IST-3.3#PBF	3-Lead SOT-223	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT1129IST-3.3#TRPBF	3-Lead SOT-223	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT1129IST-5#PBF	3-Lead SOT-223	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT1129IST-5#TRPBF	3-Lead SOT-223	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT1129IT#06PBF	5-Lead TO-220 (Flow 06)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT1129IT#PBF	5-Lead TO-220	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT1129IT-3.3#PBF	5-Lead TO-220	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT1129IT-5#06PBF	5-Lead TO-220 (Flow 06)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT1129IT-5#PBF	5-Lead TO-220	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT1129MPST-3.3#PBF	3-Lead SOT-223	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT1129MPST-3.3#TRPBF	3-Lead SOT-223	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys

Part Models	Product Lifecycle	PCN

Aug 10, 2022 - 22_0175 Laser Top Mark Conversion for DDPAK & TO220 Packages Assembled in ADPG. Country of Origin Code [MY] To Be Incorporated On Top Mark
		PCN22_0175_Form Material_Report Delta Qualification Matrix
LT1129CQ#PBF	PRODUCTION
LT1129CQ#TRPBF	PRODUCTION
LT1129CQ-3.3#PBF	PRODUCTION
LT1129CQ-3.3#TRPBF	PRODUCTION
LT1129CQ-5#PBF	PRODUCTION
LT1129CQ-5#TRPBF	PRODUCTION
LT1129CT#PBF	PRODUCTION
LT1129CT-3.3#06PBF	PRODUCTION
LT1129CT-3.3#PBF	PRODUCTION
LT1129CT-5#06PBF	PRODUCTION
LT1129CT-5#PBF	PRODUCTION
LT1129IQ#PBF	PRODUCTION
LT1129IQ#TRPBF	PRODUCTION
LT1129IQ-3.3#PBF	PRODUCTION
LT1129IQ-3.3#TRPBF	PRODUCTION
LT1129IQ-5#PBF	PRODUCTION
LT1129IQ-5#TRPBF	PRODUCTION
LT1129IT#06PBF	PRODUCTION
LT1129IT#PBF	PRODUCTION
LT1129IT-3.3#PBF	PRODUCTION
LT1129IT-5#06PBF	PRODUCTION
LT1129IT-5#PBF	PRODUCTION
Oct 8, 2024 - 24_0236 Migrating Bottom Trace Code Marking to Top Side Laser Marking for SOIC_N Package
		PCN24_0236_Form Material_Report Marking Comparison Delta Qualification Matrix
LT1129CS8#PBF	PRODUCTION
LT1129CS8#TRPBF	PRODUCTION
LT1129CS8-3.3#PBF	PRODUCTION
LT1129CS8-3.3#TRPBF	PRODUCTION
LT1129CS8-5#PBF	PRODUCTION
LT1129CS8-5#TRPBF	PRODUCTION
LT1129IS8#PBF	PRODUCTION
LT1129IS8#TRPBF	PRODUCTION
LT1129IS8-3.3#PBF	PRODUCTION
LT1129IS8-3.3#TRPBF	PRODUCTION
LT1129IS8-5#PBF	PRODUCTION
LT1129IS8-5#TRPBF	PRODUCTION
Oct 12, 2022 - 22_0254 Epoxy Change from Henkel 8290 to 8290A for 8-Lead SOIC Package (PCN part 1 of 2)
		PCN22_0254_Form Material_Report Qualification Results Summary Delta Qualification Matrix
LT1129CS8#PBF	PRODUCTION
LT1129CS8#TRPBF	PRODUCTION
LT1129CS8-3.3#PBF	PRODUCTION
LT1129CS8-3.3#TRPBF	PRODUCTION
LT1129CS8-5#PBF	PRODUCTION
LT1129CS8-5#TRPBF	PRODUCTION
LT1129IS8#PBF	PRODUCTION
LT1129IS8#TRPBF	PRODUCTION
LT1129IS8-3.3#PBF	PRODUCTION
LT1129IS8-3.3#TRPBF	PRODUCTION
LT1129IS8-5#PBF	PRODUCTION
LT1129IS8-5#TRPBF	PRODUCTION
Jun 11, 2021 - 21_0060 Laser Top Mark for 8SOICN Assembled in ADPG, UTL and CRM
		PCN21_0060_Form Material_Report Delta Qualification Matrix
LT1129CS8#PBF	PRODUCTION
LT1129CS8#TRPBF	PRODUCTION
LT1129CS8-3.3#PBF	PRODUCTION
LT1129CS8-3.3#TRPBF	PRODUCTION
LT1129CS8-5#PBF	PRODUCTION
LT1129CS8-5#TRPBF	PRODUCTION
LT1129IS8#PBF	PRODUCTION
LT1129IS8#TRPBF	PRODUCTION
LT1129IS8-3.3#PBF	PRODUCTION
LT1129IS8-3.3#TRPBF	PRODUCTION
LT1129IS8-5#PBF	PRODUCTION
LT1129IS8-5#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
Protection Switches & Controllers 2
LT4363	RECOMMENDED FOR NEW DESIGNS	High Voltage Surge Stopper with Current Limit
LTC4417	RECOMMENDED FOR NEW DESIGNS	Prioritized PowerPath^™ Controller

Parts	Product Life Cycle	Description
LT3088	RECOMMENDED FOR NEW DESIGNS	800mA Single Resistor Rugged Linear Regulator
LT1965	RECOMMENDED FOR NEW DESIGNS	1.1A, Low Noise, Low Dropout Linear Regulator

Tools & Simulations

LTspice 2

Models for the following parts are available in LTspice:

LT1129
LT1129-3.3
LT1129-5

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.

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LT1129

Overview

Documentation

Data Sheet 1

Reliability Data 1

Application Note 3

Design Note 4

Solutions Bulletin & Brochure 1