LT8331 - Low IQ Boost/SEPIC/ Flyback/Inverting Converter with 0.5A, 140V Switch
Features
- Wide Input Voltage Range: 4.5V to 100V
- Ultralow Quiescent Current and Low Ripple Burst Mode® Operation: IQ = 6μA
- 0.5A, 140V Power Switch
- Positive or Negative Output Voltage Programming with a Single Feedback Pin
- Programmable Frequency (100kHz to 500kHz)
- Synchronizable to an External Clock
- BIAS Pin for Higher Efficiency
- Programmable Undervoltage Lockout (UVLO)
- Thermally-Enhanced High Voltage MSOP Package
Typical Application
Description
The LT®8331 is a current mode DC/DC converter with a 140V, 0.5A switch operating from a 4.5V to 100V input. With a unique single feedback pin architecture, it is capable of boost, SEPIC, flyback or inverting configurations. Burst Mode operation consumes as low as 6μA quiescent current to maintain high efficiency at very low output currents, while keeping typical output ripple below 20mV.
The internally-compensated current mode architecture results in stable operation over a wide range of input and output voltages and programmable switching frequencies between 100kHz to 500kHz. A SYNC/MODE pin allows synchronization to an external clock. It can also be used to select between burst or pulse-skipping modes of operation. For increased efficiency, a BIAS pin can accept a second input to supply the INTVCC regulator. Additional features include frequency foldback and programmable soft-start for controlling inductor current during start-up.
The LT8331 is available in a thermally-enhanced MSOP package with four pins removed for high voltage spacings.
Packaging
For complete and up to date package information and drawings, please refer to our packaging page
| Part Number | Package | Code | Temp | Package Drawing |
RoHS |
|---|---|---|---|---|---|
| LT8331EMSE#PBF | MS-16E | MSE | E | 05-08-1871 | Yes |
| LT8331EMSE#TRPBF | MS-16E | MSE | E | 05-08-1871 | Yes |
| LT8331IMSE#PBF | MS-16E | MSE | I | 05-08-1871 | Yes |
| LT8331IMSE#TRPBF | MS-16E | MSE | I | 05-08-1871 | 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 | |
|---|---|---|---|---|---|---|
| LT8331EMSE#PBF | MS-16E | E | $4.22 | $2.95 | Yes | |
| LT8331EMSE#TRPBF | MS-16E | E | $3.01 | Yes | ||
| LT8331IMSE#PBF | MS-16E | I | $4.70 | $3.29 | Yes | |
| LT8331IMSE#TRPBF | MS-16E | I | $3.35 | 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 |
|---|---|---|---|
| DC2275A | LT8331 Demo Board | Boost, 10V ≤ VIN ≤ 48V, 120Vout @ up to 80mA | $125.00 | |
| Buy Now | |||
Applications
- Industrial and Automotive
- Telecom
- Medical Diagnostic Equipment
- Portable Electronics
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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:
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- 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
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Models for the following parts are available in LTspice:
LT8331
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.
