LT3595A
16 Channel
Buck Mode LED Driver
FEATURES
DESCRIPTION
The LT®3595A 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
providesidenticalLEDcurrentsresultinginuniformbright-
ness.Powerswitches,Schottkydiodes,andcompensation
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.
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4.5V to 45V Input Supply Range
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Up to 50mA LED Current per Channel
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100mA, 45V Internal Switches
Improvements vs LT3595
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Pinout Allows 1-Sided PCB Layout
Higher Maximum Switch Duty Cycle
LED Current Accuracy (7% vs 8%)
4% LED Current Matching
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16 Independent LED Channels
5000:1 True Color PWMTM Dimming Range
LEDs Disconnected in Shutdown
Internal Schottky Diodes
2MHz Switching Frequency
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AsingleexternalresistorsetstheLEDcurrentforallsixteen
channels, and dimming is then controlled for each chan-
nel by pulse width modulating the individual PWM pins.
LED current accuracy is 7%, channel-to-channel current
matching is 4% and the PWM dimming range is 5000:1.
The part is available in a 5mm × 9mm × 0.75mm 56-pin
QFN package.
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R
Pin Sets Master LED Current
SET
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Typical Efficiency: 92%
Open LED Detection and Thermal Protection
56-Pin 5mm × 9mm × 0.75mm QFN Package
APPLICATIONS
L, 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.
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LED Video Billboards
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LCD Televisions
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Stadium and Advertising Displays
TYPICAL APPLICATION
16-Channel LED Driver (Three LEDs per Channel), 20mA Current
5000:1 PWM
Dimming at 100Hz
V
IN
15V TO
0.47μF
0.47μF
0.47μF
0.47μF 0.47μF
0.47μF
0.47μF
0.47μF
45V
10μF
V
PWM
5V/DIV
V
CC
I
SW
20mA/DIV
100k
L1 SW1
OPENLED
PWM1
L2
SW2
SW3
L3
SW4
L4
L5
SW5 L6 SW6
SW7 L7
SW8 L8
PWM9
PWM10
PWM11
PWM12
PWM13
PWM14
PWM15
PWM16
GND
PWM2
I
PWM3
LED
10mA/DIV
LED
LED
PWM4
BRIGHTNESS
CONTROL
BRIGHT-
NESS
PWM5
LT3595A
3595A TA01b
PWM6
400ns/DIV
CONTROL
PWM7
V
= 15V
T = 10ms
= 2μs
IN
3 LEDS AT 20mA
PWM8
t
ON
V
CC
SHDN
V
R
SET
3V TO
5.5V
CC
L16 SW16 L15 SW15
V
SW14 L14 SW13 L13
L12 SW12 L11 SW11 V SW10 L10 SW9 L9
IN
IN
10μF
0.47μF
0.47μF
0.47μF
0.47μF 0.47μF
0.47μF
0.47μF
0.47μF
3595A TA01
3595af
1