Analog Devices LT3952

Description

The LT®3952 is a current mode step-up DC/DC converterwith an internal, 60V, 80mΩ DMOS power switch. TheLT3952 is specifically designed to drive high power LEDsin multiple configurations. It combines input and outputcurrent regulation loops with output voltage regulation tooperate as a flexible current/voltage source.Programmable switching frequency with optional spreadspectrummodulation provides EMI reduction, while stillallowing optimization of the external components forefficiency or component size. The LED current is programmablewith an external sense resistor, and can be adjustedfrom zero to full scale with a voltage at the CTRL pin. Theexternal PWM input provides LED ON/OFF control and4000:1 dimming ratio, and an internal PWM generatordelivers the efficiency of PWM dimming to standaloneor I/O limited applications. The LT3952 is available in thethermally enhanced 28-lead TSSOP package

Features

4000:1 True Color PWM™ Dimming4A, 60V Internal DMOS SwitchWide Input Voltage Range: 3V to 42V0V to 60V Output Current Regulation with MonitorPMOS Switch Driver for PWM and Output DisconnectLED Short-Circuit Protection and SHORTLED FlagInternal Spread Spectrum Frequency ModulationConstant-Current and Constant-Voltage RegulationInput Current Limit and MonitorAdjustable Frequency: 200kHz to 3MHz, Synchronizable to an External Clock10:1 Analog DimmingProgrammable Open-LED Protection with OPENLED FlagProgrammable VIN Undervoltage and Overvoltage LockoutAvailable in a 28-Lead TSSOP Package

Typical applications

• Automotive and Avionic Lighting
• Accurate Current-Limited Voltage Regulators
• Display Backlighting

More information

• Datasheet
• IC product information