LT3595_15 Datasheet, PDF (1/16 Pages) Linear Technology – 16 Channel Buck Mode LED Driver

FEATURES
■ _{4.5V to 45V Input Supply Range}
■ _{Up to 50mA LED Current per Channel}
■ _{100mA, 45V Internal Switches}
■ _{8% Relative LED Current Match at 20mA}
■ _{16 Independent LED Channels}
■ _{5000:1 True Color PWM}^TM _{Dimming Range}
■ _{LEDs Disconnected in Shutdown}
■ _{Internal Schottky Diodes}
■ _{Low Quiescent Current}
■ _{2MHz Switching Frequency}
■ _{RSET Pin Sets Master LED Current}
■ _{Typical Efficiency: 92%}
■ _{Open LED Detection and Thermal Protection}
■ _{56-Pin 5mm × 9mm × 0.75mm QFN Package}
APPLICATIONS
■ _{LED Video Billboards}
■ _{LCD Televisions}
■ _{Stadium and Advertising Displays}
LT3595
16 Channel
Buck Mode LED Driver
DESCRIPTION
The LT^®3595 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 bright-
ness. 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 profile
inductors and capacitors. A fixed 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. Rela-
tive 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.
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
True Color PWM is a trademark of Linear Technology Corporation. All other trademarks are
the property of their respective owners.
TYPICAL APPLICATION
V_IN
15V TO
45V
16-Channel LED Driver (Three LEDs per Channel), 20mA Current
0.47μF
10μF
0.47μF
0.47μF
0.47μF 0.47μF
0.47μF
0.47μF
0.47μF
V_CC
100k
LED
BRIGHTNESS
CONTROL
V_CC
3V TO
5.5V
L1 SW1 L2 SW2
SW3 L3 SW4 L4
L5 SW5 L6 SW6
SW7 L7
OPENLED
PWM1
PWM2
PWM3
PWM4
PWM5
PWM6
LT3595
PWM7
PWM8
SHDN
V_CC
L16 SW16 L15 SW15 V_IN SW14 L14 SW13 L13
L12 SW12 L11 SW11 V_IN SW10 L10
SW8 L8
PWM9
PWM10
PWM11
PWM12
PWM13
PWM14
PWM15
PWM16
GND
R_SET
SW9 L9
10μF
LED
BRIGHT-
NESS
CONTROL
5000:1 PWM
Dimming at 100Hz
V_PWM
5V/DIV
I_SW
20mA/DIV
I_LED
10mA/DIV
400ns/DIV
V_IN = 15V
T = 10ms
3 LEDS AT 20mA T_ON = 2μs
3595 TA01b
0.47μF
0.47μF
0.47μF
0.47μF 0.47μF
0.47μF
0.47μF
0.47μF
3595 TA01
3595f
1