ISSI IS31LT3360

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 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 nominalaverage 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 PWMwaveform. 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.

Features

• Up to 1.2A output current
• High efficiency (up to 98%)
• Wide input voltage range: 6V ~ 40V
• Internal 40V power switch
• Simple low parts count
• Typical 3% output current accuracy (-40°C to +105°C, IS31LT3360-SDLS3-TR)
• Typical 5% output current accuracy (-40°C to +125°C, IS31LT3360-SDLS4-TR)
• 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
• Up to 1200: 1 dimming ratio

Remarks:Recommended inductor values for the IS31LT3360 are in the range 47μH to 220μH. Refer page no.11

Typical applications

• Automotive and avionic lighting
• PAR light
• Refrigeration lights
• LED street light
• LED MR16, MR11 spot light
• Other LED lighting
• Industrial lighting

More information

• Datasheet