LT3595,pdf datasheet (Buck Mod

The LT3595 is a high performance LED Driver designed
to drive sixteen independent channels of up to 10 LEDs
at currents up to 50mA. Series connection of the LEDs
provides identical LED currents resulting in uniform brightness.
Power switches, Schottky diodes, and compensation
components are all internal, providing a small converter
footprint and lower component cost. The high 2MHz
switching frequency permits the use of tiny, low profi le
inductors and capacitors. A fi xed frequency, current mode
architecture results in stable operation over a wide range
of supply and output voltage.
A single external resistor sets the LED current for all sixteen
channels, and dimming is then controlled for each channel
by pulse width modulating the individual PWM pins. Relative
current matching among the sixteen drivers is 8% and
the PWM dimming range is 5000:1. The part is available
in a 5mm × 9mm × 0.75mm 56-pin QFN package.