LT3751

PRODUCTION

High Voltage Capacitor Charger Controller with Regulation

Part Models: 8
1ku List Price: Starting From $4.37

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Overview

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 V_CC ≤ 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 V_CC Voltage Range (5V to 24V)
Available in 20-Pin QFN 4mm × 5mm and 20-Lead TSSOP Packages

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 V_CC and V_TRANS. 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 V_CC or V_TRANS 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

Part Models: 8
1ku List Price: Starting From $4.37

Documentation

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
LT3751EFE#PBF	20-Lead TSSOP w/ EP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT3751EFE#TRPBF	20-Lead TSSOP w/ EP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT3751EUFD#PBF	20-Lead QFN (4mm x 5mm x 0.75mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT3751EUFD#TRPBF	20-Lead QFN (4mm x 5mm x 0.75mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT3751IFE#PBF	20-Lead TSSOP w/ EP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT3751IFE#TRPBF	20-Lead TSSOP w/ EP	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT3751IUFD#PBF	20-Lead QFN (4mm x 5mm x 0.75mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys
LT3751IUFD#TRPBF	20-Lead QFN (4mm x 5mm x 0.75mm w/ EP)	Material Declaration Reliablity Data Package Resources	Ultra Librarian SamacSys

Part Models	Product Lifecycle	PCN

Apr 6, 2022 - 22_0068 Laser Top Mark for ETSSOP and TSSOP Packages Assembled in ADPG [PNG] and UTL
		PCN22_0068_Form Material_Report Delta Qualification Matrix
LT3751EFE#PBF	PRODUCTION
LT3751EFE#TRPBF	PRODUCTION
LT3751IFE#PBF	PRODUCTION
LT3751IFE#TRPBF	PRODUCTION

This is the most up-to-date revision of the Data Sheet.

Software Resources

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Tools & Simulations

LTspice 1

LT3751 Demo Circuit - High Voltage Capacitor Charger Controller with Regulation (24V to 300V)

Models for the following parts are available in LTspice:

LT3751

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.