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LT3745
16-Channel 50mA LED
Driver with Buck Controller
6V to 55V Power Input Voltage Range
16 Independent LED Outputs Up to 75mA/36V
±3% LED Current Matching at 50mA (Typ ±1%)
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
40-Lead 6mm × 6mm QFN Package
Large Screen Display LED Backlighting
Mono-, Multi-, Full-Color LED Displays
LED Billboards and Signboards
FEATURES
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LED and Overtemperature Fault
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APPLICATIONS
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L , LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and
True Color PWM is a trademark of Linear Technology Corporation. All other trademarks are the
property of their respective owners.
DESCRIPTION
The LT ? 3745 integrates a 16-channel LED driver with a 55V
buck controller. The LED driver lights up to 75mA/36V 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. A ±3% LED cur-
rent matching and a 0.5μs minimum LED on-time can be
achieved at 50mA per channel.
The LT3745 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
16-Channel LED Driver, 1MHz Buck, 10 LEDs, 25mA to 75mA per Channel, 500Hz 12-Bit Dimming
V IN
42V TO 55V
V IN
CAP
0.47μF
4.7μF
EN
EN/UVLO
GATE
..
..
..
..
..
..
..
V CC
3V TO 5.5V
10μF
46.4k
60.4k
2.048MHz CLOCK
100k
10nF
32.4k
V CC
SYNC
RT
LT3745
SS
I SET
T SET
PWMCK
GND
ISP
ISN
FB
LED00
LED01
LED02
.
LED13
47μH
25m
267k
10k
C1
2 × 47μF
..
.
..
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..
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..
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..
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..
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LED14
LED15
SCKI
SCKO
3745 TA01
TTL/CMOS
SDI
LDI
SDO
LDO
TTL/CMOS
3745f
1
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