LT1108
PRODUCTIONMicropower DC/DC Converter Adjustable and Fixed 5V, 12V
- Part Models
- 9
- 1ku List Price
- Starting From $4.58
Overview
- Operates at Supply Voltages from 2V to 30V
- Consumes Only 110µA Supply Current
- Works in Step-Up or Step-Down Mode
- Only Four External Components Required
- Low Battery Detector Comparator On-Chip
- User Adjustable Current Limit
- Internal 1A Power Switch
- Fixed or Adjustable Output Voltage Versions
- Space Saving 8-Pin MiniDIP or S8 Package
The LT1108 is a versatile micropower DC/DC converter. The device requires only four external components to deliver a fixed output of 5V or 12V. Supply voltage ranges from 2V to 12V in step-up mode and to 30V in step-down mode.The LT1108 functions equally well in step-up, step-down, or inverting applications.
The LT1108 is pin-for-pin compatible with the LT1173, but has a duty cycle of 70%, resulting in increased outputcurrent in many applications. The LT1108 can deliver 150mA at 5V from a 2 AA cell input and 5V at 300mA from 9V in step-down mode. Quiescent current is just 110µA, making the LT1108 ideal for power conscious battery-operated systems.
Switch current limit can be programmed with a single resistor.An auxiliary gain block can be configured as a low battery detector, linear post regulator, under voltage lock-out circuit, or error amplifier.
Applications
- Palmtop Computers
- 3V to 5V, 5V to 12V Converters
- 9V to 5V, 12V to 5V Converters
- LCD Bias Generators
- Peripherals and Add-On Cards
- Battery Backup Supplies
- Cellular Telephones
Documentation
Data Sheet 1
Application 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 |
|---|---|---|---|
| LT1108CN8#PBF | 8-Lead PDIP (Narrow 0.3 Inch) | ||
| LT1108CN8-12#PBF | 8-Lead PDIP (Narrow 0.3 Inch) | ||
| LT1108CN8-5#PBF | 8-Lead PDIP (Narrow 0.3 Inch) | ||
| LT1108CS8#PBF | 8-Lead SOIC (Narrow 0.15 Inch) | ||
| LT1108CS8#TRPBF | 8-Lead SOIC (Narrow 0.15 Inch) | ||
| LT1108CS8-12#PBF | 8-Lead SOIC (Narrow 0.15 Inch) | ||
| LT1108CS8-12#TRPBF | 8-Lead SOIC (Narrow 0.15 Inch) | ||
| LT1108CS8-5#PBF | 8-Lead SOIC (Narrow 0.15 Inch) | ||
| LT1108CS8-5#TRPBF | 8-Lead SOIC (Narrow 0.15 Inch) |
| Part Models | Product Lifecycle | PCN |
|---|---|---|
|
Oct 8, 2024 - 24_0234 Migrating Bottom Trace Code Marking to Top Side Laser Marking for PDIP Package |
||
| LT1108CN8#PBF | PRODUCTION | |
| LT1108CN8-12#PBF | PRODUCTION | |
| LT1108CN8-5#PBF | PRODUCTION | |
|
Oct 11, 2022 - 22_0241 Epoxy Change from Henkel 8290 to 8290A for PDIP Package |
||
| LT1108CN8#PBF | PRODUCTION | |
| LT1108CN8-12#PBF | PRODUCTION | |
| LT1108CN8-5#PBF | PRODUCTION | |
|
Aug 6, 2022 - 22_0172 Laser Top Mark Conversion for PDIP Packages Assembled in ADPG [PNG] |
||
| LT1108CN8#PBF | PRODUCTION | |
| LT1108CN8-12#PBF | PRODUCTION | |
| LT1108CN8-5#PBF | PRODUCTION | |
|
Dec 14, 2023 - 22_0255 Epoxy Change from Henkel 8290 to 8290A for 8-Lead SOIC Package (PCN part 2 of 2) |
||
| LT1108CS8#PBF | PRODUCTION | |
| LT1108CS8#TRPBF | PRODUCTION | |
| LT1108CS8-12#PBF | PRODUCTION | |
| LT1108CS8-12#TRPBF | PRODUCTION | |
| LT1108CS8-5#PBF | PRODUCTION | |
| LT1108CS8-5#TRPBF | PRODUCTION | |
|
Jun 11, 2021 - 21_0060 Laser Top Mark for 8SOICN Assembled in ADPG, UTL and CRM |
||
| LT1108CS8#PBF | PRODUCTION | |
| LT1108CS8#TRPBF | PRODUCTION | |
| LT1108CS8-12#PBF | PRODUCTION | |
| LT1108CS8-12#TRPBF | PRODUCTION | |
| LT1108CS8-5#PBF | PRODUCTION | |
| LT1108CS8-5#TRPBF | 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:
- LT1108
- LT1108-12
- LT1108-5
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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