Analog Devices LT3952

Description

The LT®3952 is a current mode step-up DC/DC converter with an internal, 60V, 80mΩ DMOS power switch. The LT3952 is specifically designed to drive high power LEDs in multiple configurations. It combines input and output current regulation loops with output voltage regulation to operate as a flexible current/voltage source.

Programmable switching frequency with optional spreadspectrum modulation provides EMI reduction, while still allowing optimization of the external components for efficiency or component size. The LED current is programmable with an external sense resistor, and can be adjusted from zero to full scale with a voltage at the CTRL pin. The external PWM input provides LED ON/OFF control and 4000:1 dimming ratio, and an internal PWM generator delivers the efficiency of PWM dimming to standalone or I/O limited applications. The LT3952 is available in the thermally enhanced 28-lead TSSOP package.

Features

• 4000:1 True Color PWM™ Dimming
• 4A, 60V Internal DMOS Switch
• Wide Input Voltage Range: 3V to 42V
• 0V to 60V Output Current Regulation with Monitor
• PMOS Switch Driver for PWM and Output Disconnect
• LED Short-Circuit Protection and SHORTLED Flag
• Internal Spread Spectrum Frequency Modulation
• Constant-Current and Constant-Voltage Regulation
• Input Current Limit and Monitor
• Adjustable Frequency: 200kHz to 3MHz,Synchronizable to an External Clock
• 10:1 Analog Dimming
• Programmable Open-LED Protection with OPENLED Flag
• Programmable VIN Undervoltage and Overvoltage Lockout
• Available in a 28-Lead TSSOP Package

Typical applications

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

More information

• Datasheet
• IC product information