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LT3476EUHF-TRPBF Datasheet(PDF) 1 Page - Linear Technology

Part # LT3476EUHF-TRPBF
Description  High Current Quad Output LED Driver
Download  12 Pages
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Manufacturer  LINER [Linear Technology]
Direct Link  http://www.linear.com
Logo LINER - Linear Technology

LT3476EUHF-TRPBF Datasheet(HTML) 1 Page - Linear Technology

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LT3476
1
3476fa
High Current
Quad Output LED Driver
The LT®3476 is a quad output DC/DC converter designed
to operate as a constant-current source for driving high
current LEDs. A fixed frequency, current mode architecture
results in stable operation over a wide range of supply and
output voltages. A frequency adjust pin allows the user to
program switching frequency between 200kHz and 2MHz
to optimize efficiency and external component size.
The LT3476 senses output current at the high side of
the LED. High side current sensing is the most flexible
scheme for driving LEDs, allowing buck, boost or buck-
boost configurations. Each current monitor threshold is
trimmed to within 2.5% at the full scale of 105mV. With
an external sense resistor, the user programs the output
current range of each channel. Each of the four regulators
is independently operated by that channel’s PWM signal.
This PWM feature allows precise adjustment of the color
mixing or dimming ratio of the LED source. Dimming
ratios up to 1000:1 can be achieved.
RGGB Lighting
Automotive and Avionic Lighting
TFT LCD Backlighting
Constant-Current Sources
True Color PWMTM Dimming Delivers Up to 5000:1
Dimming Ratio (In Boost Configuration)
LED Current Regulation with High-Side Sense
VADJ Pin Accurately Sets LED Current Sense
Threshold Over Range 10mV to 120mV
Four Independent Driver Channels with 1.5A, 36V
Internal NPN Switches
Frequency Adjust Pin: 200kHz to 2MHz
High Efficiency Conversion = Up to 96%
Open LED Protection
Low Quiescent Current
22mA in Active Mode
<10μA in Shutdown Mode
Wide VIN Range: 2.8V to 16V
Thermally Enhanced, 38-Lead, 5mm × 7mm
QFN Package
100W Quad 1A
× 8 LED Driver
APPLICATIO S
FEATURES
DESCRIPTIO
TYPICAL APPLICATIO
, 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.
1000:1 PWM Dimming at 100Hz
10μH
2.2μF
1nF
21k
REF
CAP1-4
SW4
1.05V
SW1
CAP1
100mΩ
LED1
1A
SW2
SW3
VC1-4
VADJ1-4
LED1-4
VIN
PWM1-4
PWM1-4
RT
0.22μF
0.22μF
UP TO
8 LEDS
VIN
2.8V TO 16V
PVIN
33V
CAP2
100mΩ
LED2
GND
SHDN
LT3476
3476 TA01
SHDN
10μH
100k
2.2μF
× 4
4.99k
0.22μF
0.22μF
1A
1A
1A
10μH
CAP3
100mΩ
LED3
CAP4
100mΩ
LED4
10μH
PWM
5V/DIV
ILED
500mA/DIV
5μs/DIV
3476 TA02


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