This document introduces a monolithic converter that drives high power LEDs. The converter can be configured in various topologies to achieve high power constant current output. It is a 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 and/or constant-voltage source.
The document describes the LT3477, a monolithic switching regulator designed to drive high power LEDs at constant current. It features a 3A, 42V internal switch and dual rail-to-rail current sense amplifiers, allowing it to operate in various configurations including boost, buck, and buck-boost topologies.
| Switching Frequency Range | 200kHz to 3.5MHz |
|---|---|
| Maximum Switch Current | 3A |
| Switch Voltage Rating | 42V |
| Current Sense Voltage | 100mV |
The device can be configured in boost, buck, buck-boost, or SEPIC topologies.
It comes in two thermally enhanced packages: 20-pin QFN and 20-pin TSSOP.