Overview
The IS31LT3363 provides a simple circuit for multi
channel LED dimming solution. It saves two extra
power stages for typical RGB application thereby
reducing external circuitry while maintain a high
efficiency. It has a built-in buck current regulator that
provides excellent current tracking and dimming
performance. The dimming range will be greater
than 10,000:1 at 100Hz dimming frequency. PWM
frequency can be set between 100Hz~20kHz. This
dimming solution can be designed to be noise free
making it an ideal choice for household and
commercial lighting products.
For this application, user often needs a MCU and an
interface part, IS31LT3363 integrates a LDO to
provide 3.3V bias power for the external IC’s.
An automatic current foldback function allows power
savings when all the three LED strings turn off time
is longer than 10ms. Open LED and over
temperature protection ensures robust operation.
IS31LT3363 can operate over an input voltage to
36V. It comes in a thermally enhanced eTSSOP-16
package.