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 to 1.2A.

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. It

operates from 6V to 40V over two temperature

ranges of -40°C to +105°C and -40°C to +125°C.

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