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Linear Dimensions Semiconductor

LT3595A Datasheet Preview

LT3595A Datasheet

16 Channel Buck Mode LED Driver

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FEATURES
n 4.5V to 45V Input Supply Range
n Up to 50mA LED Current per Channel
n 100mA, 45V Internal Switches
n Improvements vs LT3595
Pinout Allows 1-Sided PCB Layout
Higher Maximum Switch Duty Cycle
LED Current Accuracy (7% vs 8%)
±4% LED Current Matching
n 16 Independent LED Channels
n 5000:1 True Color PWMTM Dimming Range
n LEDs Disconnected in Shutdown
n Internal Schottky Diodes
n 2MHz Switching Frequency
n RSET Pin Sets Master LED Current
n Typical Efficiency: 92%
n Open LED Detection and Thermal Protection
n 56-Pin 5mm × 9mm × 0.75mm QFN Package
APPLICATIONS
n LED Video Billboards
n LCD Televisions
n Stadium and Advertising Displays
LT3595A
16 Channel
Buck Mode LED Driver
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
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 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.
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.
TYPICAL APPLICATION
VIN
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
VCC
100k
LED
BRIGHTNESS
CONTROL
VCC
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
LT3595A
PWM7
PWM8
SHDN
VCC
L16 SW16 L15 SW15 VIN SW14 L14 SW13 L13
L12 SW12 L11 SW11 VIN SW10 L10
SW8 L8
PWM9
PWM10
PWM11
PWM12
PWM13
PWM14
PWM15
PWM16
GND
RSET
SW9 L9
10μF
LED
BRIGHT-
NESS
CONTROL
5000:1 PWM
Dimming at 100Hz
VPWM
5V/DIV
ISW
20mA/DIV
ILED
10mA/DIV
400ns/DIV
VIN = 15V
T = 10ms
3 LEDS AT 20mA tON = 2μs
3595A TA01b
0.47μF
0.47μF
0.47μF
0.47μF 0.47μF
0.47μF
0.47μF
0.47μF
3595A TA01
3595af
1




Linear Dimensions Semiconductor

LT3595A Datasheet Preview

LT3595A Datasheet

16 Channel Buck Mode LED Driver

No Preview Available !

LT3595Awww.DataSheet4U.com
ABSOLUTE MAXIMUM RATINGS
(Note 1)
Input Voltage (VIN)....................................................45V
L1-16 Voltage ...........................................................45V
Supply Voltage (VCC) ..................................................6V
RSET, OPENLED, PWM1-16, SHDN Voltage.................6V
Operating Junction Temperature Range
(Note 2) .............................................–40°C to 125°C
Storage Temperature Range...................–65°C to 125°C
PIN CONFIGURATION
TOP VIEW
56 55 54 53 52 51 50 49 48 47
L16 1
46 L1
SW16 2
45 SW1
L15 3
44 L2
SW15 4
43 SW2
VIN 5
SW14 6
42 GND
41 SW3
L14 7
40 L3
SW13 8
39 SW4
L13 9
38 L4
57
L12 10
37 L5
SW12 11
36 SW5
L11 12
35 L6
SW11 13
34 SW6
GND 14
SW10 15
33 VIN
32 SW7
L10 16
31 L7
SW9 17
30 SW8
L9 18
29 L8
19 20 21 22 23 24 25 26 27 28
UHH PACKAGE
56-LEAD (5mm s 9mm) PLASTIC QFN
TJMAX = 125°C, θJA = 31°C/W, θJC = 0.5°C/W
EXPOSED PAD (PIN 57) IS GND, MUST BE SOLDERED TO PCB
ORDER INFORMATION
LEAD FREE FINISH
TAPE AND REEL
PART MARKING
PACKAGE DESCRIPTION
LT3595AEUHH#PBF
LT3595AEUHH#TRPBF 3595A
56-Lead (5mm × 9mm) Plastic QFN
Consult LTC Marketing for parts specified with wider operating temperature ranges.
Consult LTC Marketing for information on non-standard lead based finish parts.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/
TEMPERATURE RANGE
–40°C to 125°C
3595af
2


Part Number LT3595A
Description 16 Channel Buck Mode LED Driver
Maker Linear Dimensions Semiconductor
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LT3595A Datasheet PDF






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