LT3750A

RECOMMENDED FOR NEW DESIGNS

Capacitor Charger Controller

Analog Devices LT3750A Product Info

10 February 2026 6

Features

Charges Any Size Capacitor
Easily Adjustable Output Voltage
Drives High Current NMOS FETs
Primary-Side Sense—No Output Voltage Divider Necessary

Wide Input Range: 3V to 24V
Drives Gate to V_CC – 2V
Available in 10-Lead MS Package

Part details & applications

The LT3750A is a flyback converter designed to rapidly charge large capacitors to a user-adjustable target volt-age. A patented boundary mode control scheme* minimizes transition losses and reduces transformer size. The transformer turns ratio and two external resistors easily adjust the output voltage.* A low 78mV current sense accurately limits peak switch current and also helps to maximize efficiency. With a wide input voltage range, the LT3750A can operate from a variety of power sources. A typical application can charge a 100μF capacitor to 300V in less than 300ms.

The CHARGE pin gives full control of the LT3750A to the user. The DONE pin indicates when the capacitor has reached its programmed value and the part has stopped charging.

APPLICATIONS

Emergency Warning Beacons
Professional Photoflash Systems
Security/Inventory Control Systems
High Voltage Power Supply
Electric Fences
Detonators

All registered trademarks and trademarks are the property of their respective owners.
*Protected by U.S. patents, including 6518733, 6636021.

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