Overview
Features and Benefits
- Charges Any Size Capacitor
- Low Noise Output in Voltage Regulation Mode
- Stable Operation Under a No-Load Condition
- Integrated 2A MOSFET Gate Driver with Rail-to-Rail Operation for VCC ≤ 8V
- Selectable 5.6V or 10.5V Internal Gate Drive Voltage Clamp
- User-Selectable Over/Undervoltage Detect
- Easily Adjustable Output Voltage
- Primary or Secondary Side Output Voltage Sense
- Wide Input VCC Voltage Range (5V to 24V)
- Available in 20-Pin QFN 4mm × 5mm and 20-Lead TSSOP Packages
Product Details
The LT3751 is a high input voltage capable flyback controller designed to rapidly charge a large capacitor to a user-adjustable high target voltage set by the transformer turns ratio and three external resistors. Optionally, a feedback pin can be used to provide a low noise high voltage regulated output.
The LT3751 has an integrated rail-to-rail MOSFET gate driver that allows for efficient operation down to 4.75V. A low 106mV differential current sense threshold voltage accurately limits the peak switch current. Added protection is provided via user-selectable overvoltage and undervoltage lockouts for both VCC and VTRANS. A typical application can charge a 1000μF capacitor to 500V in less than one second.
The CHARGE pin is used to initiate a new charge cycle and provides ON/OFF control. The DONE pin indicates when the capacitor has reached its programmed value and the part has stopped charging. The FAULT pin indicates when the LT3751 has shut down due to either VCC or VTRANS voltage exceeding the user-programmed supply tolerances.
Applications
- High Voltage Regulated Supply
- High Voltage Capacitor Charger
- Professional Photoflash Systems
- Emergency Strobe
- Security/Inventory Control Systems
- Detonators
Product Categories
Product Lifecycle
Production
At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.
Evaluation Kits (1)
Documentation & Resources
-
R530 Reliability Data3/26/2018
-
DC1322A - Demo Manual9/24/2009
Tools & Simulations
LTspice
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.
To launch ready-to-run LTspice demonstration circuits for this part:
Step 1: Download and install LTspice on your computer.
Step 2: Click on the link in the section below to download a demonstration circuit.
Step 3: If LTspice does not automatically open after clicking the link below, 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.
Models for the following parts are available in LTspice:
LT3751
Design Resources
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 Number | Material Declaration | Reliability Data | Pin/Package Drawing | CAD Symbols, Footprints & 3D Models |
|---|---|---|---|---|
| LT3751EFE#PBF | Material Declaration | Reliability Data | 20-Lead TSSOP w/ EP | |
| LT3751EFE#TRPBF | Material Declaration | Reliability Data | 20-Lead TSSOP w/ EP | |
| LT3751EUFD#PBF | Material Declaration | Reliability Data | 20-Lead QFN (4mm x 5mm x 0.75mm w/ EP) | |
| LT3751EUFD#TRPBF | Material Declaration | Reliability Data | 20-Lead QFN (4mm x 5mm x 0.75mm w/ EP) | |
| LT3751IFE#PBF | Material Declaration | Reliability Data | 20-Lead TSSOP w/ EP | |
| LT3751IFE#TRPBF | Material Declaration | Reliability Data | 20-Lead TSSOP w/ EP | |
| LT3751IUFD#PBF | Material Declaration | Reliability Data | 20-Lead QFN (4mm x 5mm x 0.75mm w/ EP) | |
| LT3751IUFD#TRPBF | Material Declaration | Reliability Data | 20-Lead QFN (4mm x 5mm x 0.75mm w/ EP) | |
| Wafer Fabrication Data | R530 Reliability Data |
PCN-PDN Information
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Support & Discussions
LT3751 Discussions
Sample & Buy
Ordering FAQs
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Buy Now Pricing
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List Pricing
(*)The 1Ku list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Analog Devices, Inc. authorized distributor. Pricing displayed for Evaluation Boards and Kits is based on 1-piece pricing.
Lead Times
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Sampling
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Evaluation Boards
Pricing displayed is based on 1-piece.
Up to two boards can be purchased through Analog.com. To order more than two, please purchase through one of our listed distributors.
Pricing displayed is based on 1-piece. The USA list pricing shown is for budgetary use only, shown in United States dollars (FOB USA per unit), and is subject to change. International prices may vary due to local duties, taxes, fees and exchange rates.