LT1109A - Micropower DC/DC Converter Flash Memory VPP Generator Adjustable and Fixed 5V, 12V
Features
- Uses Off-the-Shelf Inductors
- Low Cost
- 8-Pin DIP or SO Package
- Fixed 5V or 12V Output or Adjustable Version
- Only Four External Components Required
- 360µA Standby Current
- Logic-Controlled Shutdown
Typical Application
Description
The LT1109A is a simple step-up DC/DC converter. The 8- pin DIP or SOIC devices require only four external components to construct a complete DC/DC converter. Current drain is just 360µA at no load, making the device ideal for cost-sensitive applications where standby current must be kept to a minimum.
The LT1109A-12 can deliver 12V at over 150mA from a 5V supply, enough power to program four flash memory chips simultaneously. The LT1109A-5 can deliver 5V at up to 110mA from a 2V input. The devices feature a shutdown pin that turns off the oscillator when taken low. The gatedoscillator design requires no frequency compensation components. High frequency 120kHz operation permits the use of small surface mount inductors and capacitors.
Packaging
CAD Symbols and Footprints: The downloadable Zip file below contains the schematic symbol and PCB footprints.
For complete and up to date package information and drawings, please refer to our packaging page
| Part Number | Package | Code | Temp | Package Drawing |
RoHS |
|---|---|---|---|---|---|
| LT1109ACN8-12#PBF | N-8 | N | C | 05-08-1510 (N8) | Yes |
| LT1109ACN8-5#PBF | N-8 | N | C | 05-08-1510 (N8) | Yes |
| LT1109ACN8#PBF | N-8 | N | C | 05-08-1510 (N8) | Yes |
| LT1109ACS8-12#PBF | SO-8 | S8 | C | 05-08-1610 (S8) | Yes |
| LT1109ACS8-12#TRPBF | SO-8 | S8 | C | 05-08-1610 (S8) | Yes |
| LT1109ACS8-5#PBF | SO-8 | S8 | C | 05-08-1610 (S8) | Yes |
| LT1109ACS8-5#TRPBF | SO-8 | S8 | C | 05-08-1610 (S8) | Yes |
| LT1109ACS8#PBF | SO-8 | S8 | C | 05-08-1610 (S8) | Yes |
| LT1109ACS8#TRPBF | SO-8 | S8 | C | 05-08-1610 (S8) | Yes |
Order Info
- Part numbers ending in PBF are lead free. Solder plated terminal finish (SnPb) versions are non-standard and special terms and conditions and pricing applies if available. Please contact LTC marketing for information.
- Part numbers containing TR or TRM are shipped in tape and reel or 500 unit mini tape and reel, respectively
- Please refer to our general ordering information or the product datasheet for more details
Package Variations and Pricing
| Part Number | Package | Temp | Price (1-99) |
Price (1k)* |
RoHS | |
|---|---|---|---|---|---|---|
| LT1109ACN8-12#PBF | N-8 | C | $2.92 | $2.35 | Yes | |
| LT1109ACN8-5#PBF | N-8 | C | $2.92 | $2.35 | Yes | |
| LT1109ACN8#PBF | N-8 | C | $2.92 | $2.35 | Yes | |
| LT1109ACS8-12#PBF | SO-8 | C | $2.92 | $2.35 | Yes | |
| LT1109ACS8-12#TRPBF | SO-8 | C | $2.41 | Yes | ||
| LT1109ACS8-5#PBF | SO-8 | C | $2.92 | $2.35 | Yes | |
| LT1109ACS8-5#TRPBF | SO-8 | C | $2.41 | Yes | ||
| LT1109ACS8#PBF | SO-8 | C | $2.92 | $2.35 | Yes | |
| LT1109ACS8#TRPBF | SO-8 | C | $2.41 | Yes | ||
| Buy Now • Request Samples | ||||||
Demo Boards
Linear Technology offers many demo boards free of charge to qualified customers. Contact your local sales office or distributor to inquire about a demo board. Certain demo boards are also available for sale via credit card on this website. Demo boards are for evaluation purposes only. It remains the customer’s responsibility to verify proper and reliable operation in the actual end application.Click here to view our complete list of demo boards
Applications
- Flash Memory VPP Generators
- 5V to 12V Converters
- 3.3V to 12V Converters
- Disk Drives
- PC Plug-In Cards
- Peripherals
- Battery-Powered Equipment
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Design Tools
LTspice
LTspice® software is a powerful, fast and free simulation tool, schematic capture and waveform viewer with enhancements and models for improving the simulation of switching regulators. Click here to download LTspice
Models for the following parts are available in LTspice:
LT1109
LT1109-12
LT1109-5
LT1109A
LT1109A-12
LT1109A-5
Technical Support
- For immediate technical assistance, contact your local sales office or distributor or call 1-800-4-LINEAR (US customers only) or 408-432-1900.
- For less urgent requests, please complete our Technical Support Request Form. Please allow 2-3 business days for reply.
