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LT3496
Triple Output LED Driver
True Color PWM? Dimming Delivers Up to 3000:1
Built-In Gate Driver for PMOS LED Disconnect
Three Independent Driver Channels with 750mA,
Operates in Buck, Boost, Buck-Boost Modes
CTRL Pin Accurately Sets LED Current Sense
Adjustable Frequency: 330kHz to 2.1MHz
Open LED Protection
Wide V IN Supply 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
FEATURES
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Dimming Ratio
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45V Internal Switches
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Threshold Over a Range of 10mV to 100mV
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Operation from 3V to 30V
Transient Protection to 40V
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APPLICATIONS
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TYPICAL APPLICATION
High Dimming Ratio Triple Output LED Power Supply
DESCRIPTION
The LT ? 3496 is a triple output DC/DC converter designed
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 fixed 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 efficiency 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 pins are used to adjust the LED currents either
for analog dimming or overtemperature protection.
L , LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and
ThinSOT and True Color PWM are 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.
PV IN
42V
TG1
7 LEDs
CAP1
200m
LED1
0.5A
TG2
CAP2
200m
LED2
0.5A
CAP3
200m
LED3
TG3
0.5A
1μF
3
PWM
5V/DIV
I L
0.5A/DIV
3000:1 PWM Dimming at 120Hz
18μH
0.47μF 0.47μF
18μH
18μH
0.47μF
I LED
0.5A/DIV
SW1
SW2
SW3
TG1, TG2, TG3
0.5μs/DIV
3496 TA01b
CAP1, CAP2, CAP3
VC1, VC2, VC3
V IN
3V TO 24V
1μF
PWM1, PWM2, PWM3
SHDN
LED1, LED2, LED3
V IN
PWM1, PWM2, PWM3
SHDN
LT3496
GND
V REF
CTRL1, CTRL2, CTRL3
f ADJ
OVP1, OVP2, OVP3
22k
470pF
3496 TA01a
3496ff
 
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