Datasheet LT3745-1 (Analog Devices)
| Manufacturer | Analog Devices |
| Description | 16-Channel 50mA LED Driver with Buck Controller |
| Pages / Page | 28 / 1 — FEATURES. DESCRIPTION. 6V to 55V Power Input Voltage Range. 16 … |
| File Format / Size | PDF / 391 Kb |
| Document Language | English |
FEATURES. DESCRIPTION. 6V to 55V Power Input Voltage Range. 16 Independent LED Outputs Up to 75mA/36V
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Text Version of Document
LT3745-1 16-Channel 50mA LED Driver with Buck Controller
FEATURES DESCRIPTION
n
6V to 55V Power Input Voltage Range
The LT®3745-1 integrates a 16-channel LED driver with a n
16 Independent LED Outputs Up to 75mA/36V
55V buck controller. The LED driver lights up to 75mA/36V n
±4% LED Current Matching at 50mA (Typ ±1%)
of LEDs in series per channel, and the buck controller gen- n
6-Bit Dot Correction Current Adjustment
erates an adaptive bus voltage supplying the parallel LED n
12-Bit Grayscale PWM Dimming
strings. Each channel has individual 6-bit dot correction n
0.5µs Minimum LED On-Time
current adjustment and 12-bit grayscale PWM dimming. n
Adaptive LED Bus Voltage for High Efficiency
Both dot correction and grayscale are accessible via a serial n
Cascadable 30MHz LVDS Serial Data Interface
data interface in LVDS logic. A ±4% LED current match- n Full Diagnostic and Protection: Individual Open/Short ing and a 0.5µs minimum LED on-time can be achieved LED and Overtemperature Fault at 50mA per channel. n 40-Lead 6mm × 6mm QFN Package The LT3745-1 performs full diagnostic and protection against open/short LED and overtemperature fault. The
APPLICATIONS
fault status is sent back through the serial data interface. n Large Screen Display LED Backlighting The 30MHz fully-buffered, cascadable LVDS serial data n Mono-, Multi-, Full-Color LED Displays interface makes the chip extremely suitable for large screen n LED Billboards and Signboards LCD dynamic backlighting and mono-, multi-, full-color L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and LED displays. The LT3745 uses a TTL/CMOS serial data True Color PWM is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. Protected by U.S. Patents, including 8058810 interface instead of LVDS.
TYPICAL APPLICATION 16-Channel LED Driver, 1MHz Buck, 10 LEDs, 25mA to 75mA per Channel, 500Hz 12-Bit Dimming
VIN 42V TO 55V 0.47µF 4.7µF VIN CAP EN EN/UVLO GATE 47µH 25mΩ 100k VCC VCC 47µF 3V TO 3.6V 267k 10µF ×2 SYNC GND ISP 10k . RT . LT3745-1 ISN . 46.4k . .. .. SS FB 10nF I LED00 SET LED01 60.4k TSET LED02 . 32.4k .. LED13 LED14 2.048MHz PWMCK+ LED15 LVDS CLOCK PWMCK– SCKI+ SCKO+ SCKI– SCKO– LVDS LVDS SDI+ SDO+ SDI– SDO– LDI 37451 TA01 37451f 1 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Timing Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Application Package Description Typical Application Related Parts
FEATURES DESCRIPTION
n
6V to 55V Power Input Voltage Range
The LT®3745-1 integrates a 16-channel LED driver with a n
16 Independent LED Outputs Up to 75mA/36V
55V buck controller. The LED driver lights up to 75mA/36V n
±4% LED Current Matching at 50mA (Typ ±1%)
of LEDs in series per channel, and the buck controller gen- n
6-Bit Dot Correction Current Adjustment
erates an adaptive bus voltage supplying the parallel LED n
12-Bit Grayscale PWM Dimming
strings. Each channel has individual 6-bit dot correction n
0.5µs Minimum LED On-Time
current adjustment and 12-bit grayscale PWM dimming. n
Adaptive LED Bus Voltage for High Efficiency
Both dot correction and grayscale are accessible via a serial n
Cascadable 30MHz LVDS Serial Data Interface
data interface in LVDS logic. A ±4% LED current match- n Full Diagnostic and Protection: Individual Open/Short ing and a 0.5µs minimum LED on-time can be achieved LED and Overtemperature Fault at 50mA per channel. n 40-Lead 6mm × 6mm QFN Package The LT3745-1 performs full diagnostic and protection against open/short LED and overtemperature fault. The
APPLICATIONS
fault status is sent back through the serial data interface. n Large Screen Display LED Backlighting The 30MHz fully-buffered, cascadable LVDS serial data n Mono-, Multi-, Full-Color LED Displays interface makes the chip extremely suitable for large screen n LED Billboards and Signboards LCD dynamic backlighting and mono-, multi-, full-color L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and LED displays. The LT3745 uses a TTL/CMOS serial data True Color PWM is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. Protected by U.S. Patents, including 8058810 interface instead of LVDS.
TYPICAL APPLICATION 16-Channel LED Driver, 1MHz Buck, 10 LEDs, 25mA to 75mA per Channel, 500Hz 12-Bit Dimming
VIN 42V TO 55V 0.47µF 4.7µF VIN CAP EN EN/UVLO GATE 47µH 25mΩ 100k VCC VCC 47µF 3V TO 3.6V 267k 10µF ×2 SYNC GND ISP 10k . RT . LT3745-1 ISN . 46.4k . .. .. SS FB 10nF I LED00 SET LED01 60.4k TSET LED02 . 32.4k .. LED13 LED14 2.048MHz PWMCK+ LED15 LVDS CLOCK PWMCK– SCKI+ SCKO+ SCKI– SCKO– LVDS LVDS SDI+ SDO+ SDI– SDO– LDI 37451 TA01 37451f 1 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Timing Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Application Package Description Typical Application Related Parts
