Datasheet LT3797 (Analog Devices) - 3

LT3797
ORDER INFORMATION http://www.linear.com/product/LT3797#orderinfo LEAD FREE FINISH TAPE AND REEL PART (QFN)/TRAY (LXE) MARKING* PACKAGE DESCRIPTION MSL RATING TEMPERATURE RANGE
LT3797EUKG#PBF LT3797EUKG#TRPBF LT3797UKG 52-Lead (7mm × 8mm) Plastic QFN 1 –40°C to 125°C LT3797IUKG#PBF LT3797IUKG#TRPBF LT3797UKG 52-Lead (7mm × 7mm) Plastic QFN 1 –40°C to 125°C LT3797ELXE#PBF LT3797ELXE#PBF LT3797LXE 48-Lead (7mm × 7mm) Plastic eLQFP 3 –40°C to 125°C LT3797ILXE#PBF LT3797ILXE#PBF LT3797LXE 48-Lead (7mm × 7mm) Plastic eLQFP 3 –40°C to 125°C Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container. For more information on lead free part marking, go to: http://www.linear.com/leadfree/ For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/. Some packages are available in 500 unit reels through designated sales channels with #TRMPBF suffix.
ELECTRICAL CHARACTERISTICS The
l
denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VIN = 24V; EN/UVLO = 24V; CTRL1, CTRL2, CTRL3, PWM1, PWM2, PWM3 = 2V; SENSEN1, SENSEN2, SENSEN3 = 0V, OVLO = 0V, unless otherwise noted. PARAMETER CONDITIONS MIN TYP MAX UNITS
VIN Minimum Operation Voltage l 2.5 V VIN Overvoltage Lockout Rising VIN l 40 41 42.5 V Falling Hysteresis 1 V VIN Shutdown IQ EN/UVLO = 0V 0.1 1 µA EN/UVLO = 1.15V 15 µA VIN Operating IQ (Not Switching) PWM1, PWM2, PWM3 = 0V, INTVCC = 8V 0.5 0.75 mA INTVCC Operating IQ (Not Switching) PWM1, PWM2, PWM3 = 0V, INTVCC = 8V 2.4 3 mA VREF Voltage 0µA ≤ IVREF ≤ 450µA, INTVCC = 8V l 1.955 2.00 2.04 V VREF Line Regulation 2.5V ≤ VIN ≤ 40V, INTVCC = 8V 0.001 %/V SENSEP1-SENSEN1, SENSEP2-SENSEN2, l 100 110 120 mV SENSEP2-SENSEN2 Current Limit Threshold SENSEP1, SENSEP2, SENSEP3 Input Bias Current Current Out of Pin, SENSEP1, SENSEP2, 55 μA SENSEP3 = 0V SENSEN1, SENSEN2, SENSEN3 Input Bias Current Current Out of Pin 210 μA
Integrated INTVCC Power Supply (Note 7)
INTVCC Regulation Voltage l 7.15 7.5 7.75 V INTVCC Undervoltage Lockout Threshold Falling INTVCC 5.15 5.25 5.4 V Hysteresis 0.4 V INTVCC Line Regulation (ΔVINTVCC/ΔVIN) 2.5V < VIN < 40V 0.001 0.02 %
Error Amplifiers
LED Current Sense Threshold (ISP1-ISN1, ISP1, ISP2, ISP3, FBH1, FBH2, FBH3 = 48V l 243 250 257 mV ISP2-ISN2, ISP3-ISN3) ISN1, ISN2, ISN3, FBH1, FBH2, FBH3 = 0V l 238 250 272 mV 8/10th LED Current Sense Threshold (ISP1-ISN1, CTRL1, CTRL2, CTRL3=1.1V, ISP1, ISP2, ISP3 = 48V l 194.5 200 203.5 mV ISP2-ISN2, ISP3-ISN3) CTRL1, CTRL2, CTRL3=1.1V, ISN1, ISN2, ISN3 = 0V l 192 200 218 mV 1/10th LED Current Sense Threshold (ISP1-ISN1, CTRL1, CTRL2, CTRL3=0.3V, ISP1, ISP2, ISP3 = 48V l 17 25 29 mV ISP2-ISN2, ISP3-ISN3) CTRL1, CTRL2, CTRL3=0.3V, ISN1, ISN2, ISN3 = 0V l 15 25 34 mV CTRL1, CTRL2, CTRL3 Range for Linear Current l 0.2 1.2 V Sense Threshold Adjustment CTRL1, CTRL2, CTRL3 Input Bias Current Current Out of Pin, CTRL1, CTRL2, CTRL3 = 0.3V 50 100 nA CTRL1, CTRL2, CTRL3 Idle Mode Threshold Falling 135 150 170 mV Hysteresis 20 mV Rev C For more information www.analog.com 3 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Revision History Typical Application Related Parts Features Applications Typical Application Description Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Applications Package Description Revision History Typical Application Related Parts