LT1109
PRODUCTIONMicropower Low Cost DC/DC Converter Adjustable and Fixed 5V, 12V
- Part Models
- 11
- 1ku List Price
- Starting From $3.05
Overview
- Uses Off-the-Shelf Inductors
- Only 33µH Inductor Required
- Low Cost
- 3-Lead TO-92, SO8, or 8-Pin DIP
- Adjustable or Fixed 5V or 12V Output
- 120kHz Oscillator
- Only Three External Components Required
- 320µA IQ
- 1.6V Minimum Start-Up Voltage
- Logic Controlled Shutdown
The LT1109 is a simple step-up DC/DC converter. Available in 8-pin SO, 3-lead TO-92 (fixed output only) or miniDIP packages, the devices require only three external components to construct a complete DC/DC converter. Current drain is just 320µA at no load, making the device ideal for cost-sensitive applications where standby current must be kept to a minimum.
The LT1109-5 can deliver 5V at 100mA from a 3V input and the LT1109-12 can deliver 12V at 60mA from a 5V input. The 8-pin versions also feature a logic controlled SHUTDOWN pin that turns off the oscillator when taken low. The gated-oscillator design requires no frequency compensation components. The high frequency 120kHz oscillator permits the use of small surface mount inductors and capacitors. For a 5V to 12V at 120mA converter, see the LT1109A. For a 5V to 12V at 200mA converter with 20µA shutdown current, see the LT1301.
Applications
- Flash Memory VPP Generators
- 3V to 5V Converters
- 5V to 12V Converters
- Disk Drives
- PC Plug-In Cards
- Peripherals
- Battery-Powered Equipment
Documentation
Data Sheet 1
User Guide 1
Application Note 1
Design Note 2
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 |
|---|---|---|---|
| LT1109CN8#PBF | 8-Lead PDIP (Narrow 0.3 Inch) | ||
| LT1109CN8-12#PBF | 8-Lead PDIP (Narrow 0.3 Inch) | ||
| LT1109CN8-5#PBF | 8-Lead PDIP (Narrow 0.3 Inch) | ||
| LT1109CS8#PBF | 8-Lead SOIC (Narrow 0.15 Inch) | ||
| LT1109CS8#TRPBF | 8-Lead SOIC (Narrow 0.15 Inch) | ||
| LT1109CS8-12#PBF | 8-Lead SOIC (Narrow 0.15 Inch) | ||
| LT1109CS8-12#TRPBF | 8-Lead SOIC (Narrow 0.15 Inch) | ||
| LT1109CS8-5#PBF | 8-Lead SOIC (Narrow 0.15 Inch) | ||
| LT1109CS8-5#TRPBF | 8-Lead SOIC (Narrow 0.15 Inch) | ||
| LT1109CZ-12#PBF | 3-Lead TO-92 | ||
| LT1109CZ-5#PBF | 3-Lead TO-92 |
| Part Models | Product Lifecycle | PCN |
|---|---|---|
|
Oct 8, 2024 - 24_0234 Migrating Bottom Trace Code Marking to Top Side Laser Marking for PDIP Package |
||
| LT1109CN8#PBF | PRODUCTION | |
| LT1109CN8-12#PBF | PRODUCTION | |
| LT1109CN8-5#PBF | PRODUCTION | |
|
Oct 11, 2022 - 22_0241 Epoxy Change from Henkel 8290 to 8290A for PDIP Package |
||
| LT1109CN8#PBF | PRODUCTION | |
| LT1109CN8-12#PBF | PRODUCTION | |
| LT1109CN8-5#PBF | PRODUCTION | |
|
Aug 6, 2022 - 22_0172 Laser Top Mark Conversion for PDIP Packages Assembled in ADPG [PNG] |
||
| LT1109CN8#PBF | PRODUCTION | |
| LT1109CN8-12#PBF | PRODUCTION | |
| LT1109CN8-5#PBF | PRODUCTION | |
|
Dec 14, 2023 - 22_0255 Epoxy Change from Henkel 8290 to 8290A for 8-Lead SOIC Package (PCN part 2 of 2) |
||
| LT1109CS8#PBF | PRODUCTION | |
| LT1109CS8#TRPBF | PRODUCTION | |
| LT1109CS8-12#PBF | PRODUCTION | |
| LT1109CS8-12#TRPBF | PRODUCTION | |
| LT1109CS8-5#PBF | PRODUCTION | |
| LT1109CS8-5#TRPBF | PRODUCTION | |
|
Jun 11, 2021 - 21_0060 Laser Top Mark for 8SOICN Assembled in ADPG, UTL and CRM |
||
| LT1109CS8#PBF | PRODUCTION | |
| LT1109CS8#TRPBF | PRODUCTION | |
| LT1109CS8-12#PBF | PRODUCTION | |
| LT1109CS8-12#TRPBF | PRODUCTION | |
| LT1109CS8-5#PBF | PRODUCTION | |
| LT1109CS8-5#TRPBF | PRODUCTION | |
|
Feb 20, 2022 - 22_0014 Final Packaging Changes for TO-92, TO-5 and TO-46 |
||
| LT1109CZ-12#PBF | PRODUCTION | |
| LT1109CZ-5#PBF | PRODUCTION | |
This is the most up-to-date revision of the Data Sheet.
Software Resources
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LTspice
Models for the following parts are available in LTspice:
- LT1109
- LT1109-12
- LT1109-5
- LT1109A
- LT1109A-12
- LT1109A-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.
Evaluation Kits
LT1109CS8 | +5V to +12V Flash Memory Vpp Generator
Resources
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