IS31LT3360

IS31LT3360 40V/1.2A LED DRIVER WITH INTERNAL SWITCH GENERAL DESCRIPTION The IS31LT3360 is a continuous mode inductive step-down converter, designed for driving a single LED or multiple series connected LEDs efficiently from a voltage source higher than the LED voltage. The chip operates from an input supply between 6V and 40V and provides an externally adjustable output current of up to1.2A. The IS31LT3360 includes an integrated output switch and a high-side output current sensing circuit, which uses an external resistor to set the nominal average output current. Output current can be adjusted linearly by applying an external control signal to the ADJ pin. The ADJ pin will accept either a DC voltage or a PWM waveform. This will provide either a continuous or a gated output current. Applying a voltage less than 0.2V to the ADJ pin turns the output off and switches the chip into a low current standby state. The chip is assembled in SOT89-5 package. OCTOBER 2011 FEATURES  Up to 1.2A output current  High efficiency (up to 98% )  Wide input voltage range: 6V to 40V  Internal 40V power switch  Simple low parts count  Typical 3% output current accuracy  Single pin on/off and brightness control using DC voltage or PWM  Up to 1MHz switching frequency  Inherent LED open-circuit/short-circuit protection  Thermal shutdown protection circuitry  Typical 1200：1 dimming ratio APPLICATIONS  LED MR16, MR11 spotlight  LED street light  PAR light  Other LED lighting APPLICATION C...