LT3496 LINER [Linear Technology], LT3496 Datasheet
LT3496
Manufacturer Part Number
LT3496
Description
Triple Output LED Driver
Manufacturer
LINER [Linear Technology]
Datasheet
1.LT3496.pdf
(20 pages)
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FEATURES
APPLICATIONS
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TYPICAL APPLICATION
3V TO 24V
True Color PWM™ Dimming Delivers Up to 3000:1
Dimming Ratio
Built-In Gate Driver for PMOS LED Disconnect
Three Independent Driver Channels with 750mA,
45V Internal Switches
Operates in Buck, Boost, Buck-Boost Modes
CTRL Pin Accurately Sets LED Current Sense
Threshold Over a Range of 10mV to 100mV
Adjustable Frequency: 330kHz to 2.1MHz
Open LED Protection
Wide Input Voltage Range:
Surface Mount Components
28-Lead (4mm × 5mm) QFN and TSSOP Packages
RGB Lighting
Billboards and Large Displays
Automotive and Avionic Lighting
Constant-Current Sources
Operation from 3V to 30V
Transient Protection to 40V
V
1μF
IN
PWM1-3
High Dimming Ratio Triple Output LED Power Supply
SHDN
PV
7 LEDs
42V
TG1
IN
18μH
CAP1-3
LED1-3
V
PWM1-3
SHDN
IN
SW1
200mΩ
0.5A
CAP1
LED1
0.47μF 0.47μF
TG2
18μH
LT3496
SW2
GND
200mΩ
0.5A
CAP2
LED2
18μH
SW3
200mΩ
0.5A
CAP3
LED3
0.47μF
CTRL1-3
OVP1-3
TG3
TG1-3
VC1-3
FADJ
V
REF
DESCRIPTION
The LT
to operate as a constant-current source and is ideal for
driving LEDs. The LT3496 works in buck, boost or buck-
boost mode. The LT3496 uses a fi xed frequency, current
mode architecture resulting in stable operation over a
wide range of supply and output voltages. A frequency
adjust pin allows the user to program switching frequency
between 330kHz and 2.1MHz to optimize effi ciency and
external component size.
The LT3496 supports 3000:1 dimming control on each
channel. Each of the three regulators is independently
operated by that channel’s PWM signal. The PWM feature
allows precise adjustment of the color mixing or dimming
ratio of the LED source. Each of the three channels has
a built-in gate driver to drive an external LED-disconnect
P-channel MOSFET, allowing high dimming range. The
output current range of each channel of the LT3496 is
programmed with an external sense resistor.
The CTRL pin is used to adjust the LED current either for
analog dimming or overtemperature protection.
L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All other
trademarks are the property of their respective owners. Protected by U.S. Patents, including
7199560, 7321203, and others pending.
1μF
3496 TA01a
3
22k
470pF
®
Triple Output LED Driver
3496 is a triple output DC/DC converter designed
0.5A/DIV
0.5A/DIV
5V/DIV
PWM
I
LED
I
L
3000:1 PWM Dimming at 120Hz
0.5μs/DIV
LT3496
3496 TA01b
3496fe
1
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