LT LT3477EUF#PBF

DC DC 稳压器2.5V25V3A（开关）

Overview

The LT3477EUF is a current mode, 3A DC/DC step-up converter with dual rail-to-rail current sense amplifiers and an internal 3A, 42V switch. It combines a traditional voltage feedback loop and two unique current feedback loops to operate as a constant-current, constant-voltage source. Both current sense voltages are set at 100mV and can be adjusted independently using the IADJ1 and IADJ2 pins. Efficiency of up to 93% can be achieved in typical applications. The LT3477EUF features a programmable soft-start function to limit inductor current during start-up. Both inputs of the error amplifier are available externally allowing positive and negative output voltages (boost, inverting, SEPIC, Flyback). The switching frequency is programmable from 200kHz to 3.5MHz through an external resistor.

Available in thermally enhanced 20-pin (4mm × 4mm) QFN and 20-pin TSSOP packages, the LT3477EUF provides a complete solution for both constant-voltage and constantcurrent applications.

Features

Bulk Package
Available in the 20-WFQFN Exposed Pad package
Operating temperature of -40°C~85°C TA
Frequency of 200kHz~3.5MHz
Operating with the supply voltage of 3.3V
Switching frequency of 3.5MHz
Output voltage of 42V

Surface Mount Mounting Type

Applications

There are a lot of Linear Technology/Analog Devices
LT3477EUF#PBF LED Driver ICs applications.

• Gallery lighting
• Museum lighting
• High-end retail lighting
• Medical surgery lighting
• Replacement lamps
• Panel lighting
• Down lights
• Linear fluorescent
• A- lamps
• General LED Lighting: Down-lights, Base-lights, Ceiling Lights, Exterior Lights