LT3494 - Micropower Low Noise Boost Converters with Output Disconnect
Features
- Low Quiescent Current
65µA in Active Mode
1µA in Shutdown Mode - Switching Frequency is Non-Audible Over Entire Load Range
- Integrated Power NPN:
350mA Current Limit (LT3494A)
180mA Current Limit (LT3494) - Integrated Schottky Diode
- Integrated Output Disconnect
- Integrated Output Dimming
- Wide Input Range: 2.3V to 16V
- Wide Output Range: Up to 40V
- Tiny 8-Lead 3mm x 2mm DFN Package
Typical Application
Description
The LT3494/LT3494A are low noise boost converters with integrated power switch, Schottky diode and output disconnect circuitry. The parts use a novel* control technique resulting in low output voltage ripple as well as high efficiency over a wide load current range. This technique guarantees that the switching frequency stays above the audio band for the entire load range. The parts feature a high performance NPN power switch with a 350mA and 180mA current limit for the LT3494A and LT3494 respectively. The quiescent current is a low 65µA, which is further reduced to less than 1µA in shutdown. The internal disconnect circuitry allows the output voltage to be isolated from the input during shutdown. An auxiliary reference input (CTRL pin) overrides the internal 1.225V feedback reference with any lower value allowing full control of the output voltage during operation. The LT3494/LT3494A are available in a tiny 8-lead 3mm x 2mm DFN package.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 |
|---|---|---|---|---|---|
| LT3494AEDDB#PBF | 3x2 DFN-8 | DDB | E | 05-08-1702 | Yes |
| LT3494AEDDB#TRMPBF | 3x2 DFN-8 | DDB | E | 05-08-1702 | Yes |
| LT3494AEDDB#TRPBF | 3x2 DFN-8 | DDB | E | 05-08-1702 | Yes |
| LT3494EDDB#PBF | 3x2 DFN-8 | DDB | E | 05-08-1702 | Yes |
| LT3494EDDB#TRMPBF | 3x2 DFN-8 | DDB | E | 05-08-1702 | Yes |
| LT3494EDDB#TRPBF | 3x2 DFN-8 | DDB | E | 05-08-1702 | 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 | |
|---|---|---|---|---|---|---|
| LT3494AEDDB#PBF | 3x2 DFN-8 | E | $2.07 | Yes | ||
| LT3494AEDDB#TRMPBF | 3x2 DFN-8 | E | $2.07 | $1.50 | Yes | |
| LT3494AEDDB#TRPBF | 3x2 DFN-8 | E | $2.07 | $1.45 | Yes | |
| LT3494EDDB#PBF | 3x2 DFN-8 | E | $2.07 | Yes | ||
| LT3494EDDB#TRMPBF | 3x2 DFN-8 | E | $2.07 | $1.50 | Yes | |
| LT3494EDDB#TRPBF | 3x2 DFN-8 | E | $2.07 | $1.45 | 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.| Part Number | Description | Price | Documentation |
|---|---|---|---|
| DC1024A-A | LT3494EDDB Demo Board | 3V-4.2Vin, 15Vout @ 32mA | $75.00 | |
| DC1024A-B | LT3494AEDDB Demo Board | 3V-4.2Vin, 15Vout @ 44mA | $75.00 | |
| Buy Now | |||
Applications
- OLED Power
- Low Noise Power
- MP3 Players
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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
To launch a ready to run LTspice demonstration circuit for this part:
- Step 1: If you have not installed LTspice on this computer, download and install LTspice
- Step 2: Once LTspice is installed, click on the link(s) below to launch the simulation
- Step 3: If LTspice does not automatically open after clicking the link above, you can instead run the simulation by right clicking on the link and selecting "Save Target As." After saving the file to your computer, start LTspice and open the demonstration circuit by selecting 'Open' from the 'File' menu
To explore other ready to run LTspice demonstration circuits, please visit our Demo Circuits Collection.
Models for the following parts are available in LTspice:
LT3494
LT3494A
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.
