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LT3475/LT3475-1
Dual Step-Down
1.5A LED Driver
FEATURES
DESCRIPTIO
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True Color PWM TM Delivers Constant Color with
3000:1 Dimming Range
Wide Input Range: 4V to 36V Operating, 40V
Maximum
Accurate and Adjustable Control of LED Current
from 50mA to 1.5A
High Side Current Sense Allows Grounded Cathode
LED Operation
Open LED (LT3475) and Short Circuit Protection
LT3475-1 Drives LED Strings Up to 25V
Accurate and Adjustable 200kHz to 2MHz
Switching Frequency
Anti-Phase Switching Reduces Ripple
Uses Small Inductors and Ceramic Capacitors
Available in the Compact 20-Lead TSSOP Thermally
Enhanced Surface Mount Package
The LT ? 3475/LT3475-1 are dual step-down DC/DC
converters designed to operate as a constant-current
source. An internal sense resistor monitors the output
current allowing accurate current regulation ideal for
driving high current LEDs. The high side current sense al-
lows grounded cathode LED operation. High output current
accuracy is maintained over a wide current range, from
50mA to 1.5A, allowing a wide dimming range. Unique
PWM circuitry allows a dimming range of 3000:1, avoid-
ing the color shift normally associated with LED current
dimming.
The high switching frequency offers several advantages,
permitting the use of small inductors and ceramic capaci-
tors. Small inductors combined with the 20 lead TSSOP
surface mount package save space and cost versus
alternative solutions. The constant switching frequency
APPLICATIO S
combined with low-impedance ceramic capacitors result
in low, predictable output ripple.
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Automotive and Avionic Lighting
Architectural Detail Lighting
Display Backlighting
Constant-Current Sources
With its wide input range of 4V to 36V, the LT3475/LT3475-1
regulate a broad array of power sources. A current mode
PWM architecture provides fast transient response and
cycle-by-cycle current limiting. Frequency foldback and
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation.
All other trademarks are the property of their respective owners. Patents Pending.
TYPICAL APPLICATIO
Dual Step-Down 1.5A LED Driver
V IN
thermal shutdown provide additional protection.
Ef?ciency
5V TO 36V
4.7μF
V IN
SHDN
95
V IN = 12V
TWO SERIES CONNECTED
BOOST1
BOOST2
90
WHITE 1.5A LEDS
10μH
0.22μF
SW1
LT3475
SW2
0.22μF
10μH
85
80
SINGLE WHITE 1.5A LED
OUT1
LED1
OUT2
LED2
75
*DIMMING
CONTROL
PWM1
V C1
PWM2
V C2
DIMMING*
CONTROL
70
65
2.2μF
0.1μF
1.5A LED
CURRENT
REF
V ADJ1
GND
R T
V ADJ2
24.3k
0.1μF
1.5A LED
CURRENT
2.2μF
60
55
0
0.5
1
1.5
3475 TA01
LED CURRENT (A)
*SEE APPLICATIONS SECTION FOR DETAILS
f SW = 600kHz
3475 TA01b
3475fb
1
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