LT1129
LT1129
PRODUCTIONMicropower Low Dropout Regulators with Shutdown
- Part Models
- 44
- 1ku List Price
- Starting From $4.02
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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
Documentation
Data Sheet 1
Application Note 3
Design Note 4
Brochure 1
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 | ||
| LT1129CQ#TRPBF | 5-Lead DD Pak | ||
| LT1129CQ-3.3#PBF | 5-Lead DD Pak | ||
| LT1129CQ-3.3#TRPBF | 5-Lead DD Pak | ||
| LT1129CQ-5#PBF | 5-Lead DD Pak | ||
| LT1129CQ-5#TRPBF | 5-Lead DD Pak | ||
| LT1129CS8#PBF | 8-Lead SOIC (Narrow 0.15 Inch) | ||
| LT1129CS8#TRPBF | 8-Lead SOIC (Narrow 0.15 Inch) | ||
| LT1129CS8-3.3#PBF | 8-Lead SOIC (Narrow 0.15 Inch) | ||
| LT1129CS8-3.3#TRPBF | 8-Lead SOIC (Narrow 0.15 Inch) | ||
| LT1129CS8-5#PBF | 8-Lead SOIC (Narrow 0.15 Inch) | ||
| LT1129CS8-5#TRPBF | 8-Lead SOIC (Narrow 0.15 Inch) | ||
| LT1129CST-3.3#PBF | 3-Lead SOT-223 | ||
| LT1129CST-3.3#TRPBF | 3-Lead SOT-223 | ||
| LT1129CST-5#PBF | 3-Lead SOT-223 | ||
| LT1129CST-5#TRPBF | 3-Lead SOT-223 | ||
| LT1129CT#PBF | 5-Lead TO-220 | ||
| LT1129CT-3.3#06PBF | 5-Lead TO-220 (Flow 06) | ||
| LT1129CT-3.3#PBF | 5-Lead TO-220 | ||
| LT1129CT-5#06PBF | 5-Lead TO-220 (Flow 06) | ||
| LT1129CT-5#PBF | 5-Lead TO-220 | ||
| LT1129IQ#PBF | 5-Lead DD Pak | ||
| LT1129IQ#TRPBF | 5-Lead DD Pak | ||
| LT1129IQ-3.3#PBF | 5-Lead DD Pak | ||
| LT1129IQ-3.3#TRPBF | 5-Lead DD Pak | ||
| LT1129IQ-5#PBF | 5-Lead DD Pak | ||
| LT1129IQ-5#TRPBF | 5-Lead DD Pak | ||
| LT1129IS8#PBF | 8-Lead SOIC (Narrow 0.15 Inch) | ||
| LT1129IS8#TRPBF | 8-Lead SOIC (Narrow 0.15 Inch) | ||
| LT1129IS8-3.3#PBF | 8-Lead SOIC (Narrow 0.15 Inch) | ||
| LT1129IS8-3.3#TRPBF | 8-Lead SOIC (Narrow 0.15 Inch) | ||
| LT1129IS8-5#PBF | 8-Lead SOIC (Narrow 0.15 Inch) | ||
| LT1129IS8-5#TRPBF | 8-Lead SOIC (Narrow 0.15 Inch) | ||
| LT1129IST-3.3#PBF | 3-Lead SOT-223 | ||
| LT1129IST-3.3#TRPBF | 3-Lead SOT-223 | ||
| LT1129IST-5#PBF | 3-Lead SOT-223 | ||
| LT1129IST-5#TRPBF | 3-Lead SOT-223 | ||
| LT1129IT#06PBF | 5-Lead TO-220 (Flow 06) | ||
| LT1129IT#PBF | 5-Lead TO-220 | ||
| LT1129IT-3.3#PBF | 5-Lead TO-220 | ||
| LT1129IT-5#06PBF | 5-Lead TO-220 (Flow 06) | ||
| LT1129IT-5#PBF | 5-Lead TO-220 | ||
| LT1129MPST-3.3#PBF | 3-Lead SOT-223 | ||
| LT1129MPST-3.3#TRPBF | 3-Lead SOT-223 |
| 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 |
||
| 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 |
||
| 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) |
||
| 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 |
||
| 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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Tools & Simulations
LTspice 2
- LT1129-5 Demo Circuit - Micropower Low Dropout Regulator with Shutdown (5.5-30V to 5V @ 500mA)
- LTC695 - Supervisory Circuits, LT1129 - LDO Linear Regulators
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.