ADI LTC3452EUF#TRPBF

Регулятор постоянного тока DC2.7V5.5V25 мА, 150 мА

Overview

The LTC3452EUF is a synchronous buck-boost DC/DC converter optimized for driving two banks of white LEDs from a single Li-Ion battery input. Five parallel LEDs can be driven at up to 25mA each in the low power LED bank, while two LEDs can be driven at up to 150mA each (or a single LED at 300mA) in the high power LED bank. The regulator operates in either synchronous buck, synchronous boost or buck-boost mode, depending on input voltage and LED maximum forward voltage. Optimum efficiency is achieved by sensing which LED requires the largest forward voltage drop at its programmed current, and regulating the common output rail for lowest dropout. Efficiency of 85% can be achieved over the entire usable range of a Li-Ion battery (2.7V to 4.2V).

A high constant operating frequency of 1MHz allows the use of a small external inductor. The LTC3452EUF is offered in a low profile (0.75mm) thermally enhanced 20-lead (4mm × 4mm) QFN package.

Features

Applications

• Architectural lighting
• Street lighting
• Stage and Studio lighting
• Refrigeration lighting
• Portable lighting
• Gallery lighting
• Museum lighting
• High-end retail lighting
• Medical surgery lighting
• Replacement lamps