LT3950

Name: LT3950
Brand: Analog Devices
Price: 2.92 USD
Availability: InStock

RECOMMENDED FOR NEW DESIGNS

60V, 1.5A LED Driver with Internal Exponential Scale Dimming

Data Sheet (Rev. B) Product Selection Table

Part Models: 6
1ku List Price: Starting From $2.92

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Overview

Operates in Boost, SEPIC, Buck Mode and Buck-Boost Mode
128:1 Internal Exponential Scale PWM Dimming
Wide Input Voltage Range (3V to 60V)
1.5A, 60V Internal Switch
20000:1 External PWM Dimming at 100Hz
±2% LED Current and Output Voltage Regulation
PMOS Switch Driver for PWM Dimming
LED Short/Open Protection and Indication
Constant Voltage and Constant Current Regulation

Adjustable 300kHz to 2MHz Switching Frequency
Adjustable 100Hz to 1kHz PWM Generator Frequency
Internal Spread Spectrum Frequency Modulation
Easy Synchronization to External Clock
Programmable V_IN UVLO with Hysteresis
Available in 16-Lead MSOP Package
AEC-Q100 Qualified for Automotive Applications

Part Models: 6
1ku List Price: Starting From $2.92

Documentation

Data Sheet 1

LT3950: 60V, 1.5A LED Driver with Internal Exponential Scale Dimming Data Sheet (Rev.B) 11/03/2020

Technical Articles 2

Can Nonsynchronous DC-to-DC Boost Converters (with a Catch Diode) Still Have Low Emissions? 03/02/2022

How to Use LTspice to Produce Bode Plots for LED Drivers 04/01/2021

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
LT3950EMSE#PBF	16-Lead MSOP w/ EP	Material Declaration Reliability Report Package Resources	Ultra Librarian SamacSys
LT3950EMSE#TRPBF	16-Lead MSOP w/ EP	Material Declaration Reliability Report Package Resources	Ultra Librarian SamacSys
LT3950JMSE#PBF	16-Lead MSOP w/ EP	Material Declaration Reliability Report Package Resources	Ultra Librarian SamacSys
LT3950JMSE#TRPBF	16-Lead MSOP w/ EP	Material Declaration Reliability Report Package Resources	Ultra Librarian SamacSys
LT3950JMSE#WPBF	16-Lead MSOP w/ EP	Material Declaration Reliability Report Package Resources	Ultra Librarian SamacSys
LT3950JMSE#WTRPBF	16-Lead MSOP w/ EP	Material Declaration Reliability Report Package Resources	Ultra Librarian SamacSys

Part Models	Product Lifecycle	PCN

Feb 14, 2025 - 25_0016 Bond Wire Change from Gold to Copper Wire (Notification Only)
		PCN25_0016_Form Material_Report
LT3950EMSE#PBF	PRODUCTION
LT3950EMSE#TRPBF	PRODUCTION
LT3950JMSE#PBF	PRODUCTION
LT3950JMSE#TRPBF	PRODUCTION
Apr 17, 2025 - 25_0119 Bond Wire Change from Gold to Copper (Automotive)
		PCN25_0119_Form Material_Report
LT3950JMSE#WPBF	PRODUCTION
LT3950JMSE#WTRPBF	PRODUCTION
Apr 9, 2025 - 25_0016 Bond Wire Change from Gold to Copper Wire (Notification Only)
		PCN25_0016_Form Material_Report
LT3950JMSE#WPBF	PRODUCTION
LT3950JMSE#WTRPBF	PRODUCTION

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

Software Resources

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Tools & Simulations

LTspice 1

LT3950 LED Driver Example Circuit

Models for the following parts are available in LTspice:

LT3950

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.

Evaluation Kits

LT3950 Demo Board | 60V 1.5A LED Driver with Internal Log-Scale Dimming

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Product Details

Demonstration circuit 2788A is a boost LED driver featuring the LT^®3950. This demonstration circuit powers a string of LEDs at 330mA. The step-up topology can be used to drive a string of up to 28V of LEDs as assembled. The maximum output voltage capability of the LT3950 is 60V. DC2788A runs from an input voltage range of 6V to 24V as built. It also runs at 2MHz and has the capability to turn on spread spectrum frequency modulation (SSFM) for a frequency range of 2.0MHz to 2.5MHz. Dimming control can be achieved with analog dimming or PWM dimming—either from an external or internally-generated clock source. DC2788A features undervoltage lockout (UVLO) set at 6.6V with a 1.0V hysteresis for turn-on.

The UVLO voltage, LED current, output voltage range, switching frequency, brightness control, SSFM, and the topology can all be adjusted with simple modifications to the demonstration circuit.

LT3950 is a monolithic 1.5A peak switch current, 60V LED driver. The guaranteed peak switch current rating of the IC is 1.5A and this is important to know when calculating maximum output current at a given LED voltage and input voltage for a boost converter. The LT3950 features SSFM and a well-controlled SW node for low emissions.

A frequency range of 200kHz to 2MHz and a high-side PWMTG PWM-dimming MOSFET makes this a very versatile IC for many applications. It can be used for boost, buck-boost mode and buck mode LED driver applications. The PWMTG MOSFET not only provides high PWM dimming ratio capability, but it also serves as a short-circuit protection device. The FAULT flag indicates when there is either a short-circuit or open-LED fault at the output.

The demo circuit is designed to be easily reconfigured to suit other applications, including the example schematics in the data sheet. Consult technical support for assistance.

High voltage operation, 3V input voltage operation, multiple topologies, small-and-compact size, fault protection, low EMI, and multiple brightness control options make the LT3950 flexible and powerful for compact, noise-sensitive LED driver solutions. The LT3950JMSE featured on this demo circuit is available in a thermally enhanced 16-lead plastic MSOP package. The LT3950 data sheet must be read in conjunction with this demo manual to properly use or modify demo circuit DC2788A.