Datasheet LT3745-1 (Analog Devices) - 4

LT3745-1
ELECTRICAL CHARACTERISTICS The
l
denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VIN = 12V, VCC = 3.3V, VEN/UVLO = 1.5V, VFB = 1.5V, VISP = VISN = 0V, RT = 105k, RISET = 60.4k, CCAP = 0.47µF to VIN, unless otherwise noted. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS LED Driver
VISET Trimmed ISET Pin Voltage l 1.181 1.205 1.229 V LEDxx Operating Voltage VIN = 48V, VISP = VISN = VLEDxx l 36 V LEDxx Leakage Current LED Channel Off, VIN = 48V, 0.2 µA VISP = VISN = 36V, VLEDxx = 24V ILED LED Constant Sink Current VISP = VISN = 5V, VLEDxx = 1V REGDC = 0x00 l 23.3 25.3 27.3 mA REGDC = 0x20 l 47.5 50.5 53.5 mA REGDC = 0x3F l 70 74 78 mA ∆ILEDC Current Mismatch Between Channels VISP = VISN = 5V, VLEDxx = 1V, l ±1 ±4 % REGDC = 0x20 (Note 6) ∆ILEDD Current Mismatch Between Devices VISP = VISN = 5V, VLEDxx = 1V, l ±1 ±3 % REGDC = 0x20 (Note 7) ∆ILINE LED Current Line Regulation VISP = VISN = 5V, VLEDxx = 1V, 0.1 0.2 %/V REGDC = 0x20, VCC = 3V to 3.6V (Note 8) ∆ILOAD LED Current Load Regulation VISP = VISN = 5V, REGDC = 0x20, 0.1 0.2 %/V VLEDxx = 1V to 3V (Note 9) VOPEN Open LED Threshold VISP = VISN = 5V, VLEDxx Falling 0.35 V VSHT Short LED Threshold VISP = VISN = 5V, VLEDxx Rising 3.7 3.9 4.1 V tLEDON Minimum LED On-Time VISP = VISN = 5V, REGGS = 0x001 0.5 µs
Thermal Protection
ITSET TSET Output Current VTSET = 1V l 19.0 19.8 20.6 µA TSET Over Temperature Threshold TA = 25°C 510 mV
Serial Data Interface
Single-Ended Input (Note 10) VCC = 3V to 3.6V VSIH High Level Voltage 2.4 VCC V VSIL Low Level Voltage 0 0.6 V ISI Single-Ended Input Current VCC = 3V to 3.6V, SI = VCC or GND –0.2 0.2 µA Differential Input (Note 11) VCC = 3V to 3.6V VCM Common Mode VID = 200mV 0.1 2.3 V VDTH High Threshold VCM = 1.2V 50 100 mV VDTL Low Threshold VCM = 1.2V –100 –50 mV IDI Differential Input Current VCC = 3.6V; DI+, DI– = 2.4V or 0V –0.2 0.2 µA VOD Differential Output Voltage (Note 11) RL = 100Ω 230 330 430 mV ∆VOD VOD Magnitude Change Between RL = 100Ω 1 10 mV Complementary Outputs VOS Differential Output Offset Voltage RL = 100Ω 1.1 1.2 1.3 V ∆VOS VOS Magnitude Change Between RL = 100Ω 1 10 mV Complementary Outputs IOSD Differential Output Short-Circuit Current DO+ = 0V or DO– = 0V –6 –8 mA 37451f 4 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