LT3746
32-Channel 20mA LED
Driver with Buck Controller
6V to 55V Power Input Voltage Range
32 Independent LED Outputs up to 30mA/13V
6-Bit Dot Correction Current Adjustment
12-Bit Grayscale PWM Dimming
0.5μs Minimum LED On Time
Adaptive LED Bus Voltage for High Efficiency
Cascadable 30MHz Serial Data Interface
Full Diagnostic and Protection: Individual Open/Short
Large Screen Display LED Backlighting
Mono-, Multi-, Full-Color LED Displays
LED Billboards and Signboards
FEATURES
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LED and Overtemperature Fault
APPLICATIONS
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L , LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear
Technology Corporation. All other trademarks are the property of their respective owners.
DESCRIPTION
The LT ? 3746 integrates a 32-channel LED driver with a 55V
buck controller. The LED driver lights up to 30mA/13V of
LEDs in series per channel, and the buck controller gener-
ates an adaptive bus voltage supplying the parallel LED
strings. Each channel has individual 6-bit dot correction
current adjustment and 12-bit grayscale PWM dimming.
Both dot correction and grayscale are accessible via a
serial data interface in TTL/CMOS logic.
The LT3746 performs full diagnostic and protection
against open/short LED and overtemperature fault. The
fault status is sent back through the serial data interface.
The 30MHz fully-buffered, skew-balanced, cascadable
serial data interface makes the chip extremely suitable
for large screen LCD dynamic backlighting and mono-,
multi-, full-color LED displays.
TYPICAL APPLICATION
32-Channel LED Driver, 1MHz Buck, 3 LEDs 10mA to 30mA per Channel, 500Hz 12-Bit Dimming
V IN
13V TO 42V
V IN
CAP
0.47μF
4.7μF
EN
EN/UVLO
GATE
V CC
3V TO 5.5V
10μF
46.4k
100k
10nF
V CC
SYNC
RT
SS
LT3746
GND
ISP
ISN
FB
22μH
33m
80.6k
10k
C1
2 × 47μF
..
60.4k
2.048MHz CLOCK
32.4k
I SET
T SET
PWMCK
LED00
LED01
LED02
.
LED29
LED30
LED31
SCKI
SCKO
TTL/CMOS
SDI
LDI
SDO
LDO
TTL/CMOS
3746 TA01
For more information www.linear.com/3746
3746fa
1
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