Datasheet LT3744 (Analog Devices) - 3

LT3744
orDer inForMaTion LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE
LT3744EUHE#PBF LT3744EUHE#TRPBF 3744 36-Lead (5mm × 6mm) Plastic QFN –40°C to 125°C LT3744IUHE#PBF LT3744IUHE#TRPBF 3744 36-Lead (5mm × 6mm) Plastic QFN –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. Consult LTC Marketing for information on nonstandard lead based finish parts. 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/
e lecTrical characTerisTics The
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denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VIN = 12V, VEN/UVLO = 2V, SGND = VEE = 0V unless otherwise noted. PARAMETER CONDITIONS MIN TYP MAX UNITS
Input Voltage Range (Note 2) 3.3 36 V VIN Pin Quiescent Current (Note 3) Non-Switching Operation VEN/UVLO = 2V, Not Switching 2.2 2.6 mA Shutdown Mode VEN/UVLO = 0V l 1 µA EN/UVLO Pin Threshold (Rising) 1.225 1.3 1.375 V EN/UVLO Hysteresis –65 mV EN/UVLO Pin Current EN/UVLO = 1.0V 4.8 μA PWM1, PWM2, PWM3 Input High Referenced to SGND 2.0 V PWM1, PWM2, PWM3 Input Low Referenced to SGND 0.8 V PWM1, PWM2, PWM3 Pin Currents PWM1, PWM2, PWM3 = 2.0V 100 nA CTRL1, CTRL2, CTRL3 Control Range Referenced to SGND 0 1.5 V CTRL1, CTRL2, CTRL3, Pin Currents CTRL1, CTRL2, CTRL3, = 1.5V 100 nA CTRLT Pin Current CTRLT = 1.5V 100 nA
Reference
Reference Voltage (VREF Pin) Referenced to SGND l 1.96 2 2.04 V
LED and Inductor Current Sensing
Full Range LED_ISP to LED_ISN CTRL1 = 1.5V, PWM1 = 2V, PWM2 and PWM3 = 0V l 58.2 60.0 61.8 mV Current Regulation Accuracy, Full Range l –3.0 3.0 % 1/20 Range LED_ISP to LED_ISN CTRL1 = 0.075V, PWM1 = 2V, PWM2 and PWM3 = 0V l 2 3 4 mV LED_ISP and LED_ISN Pin Current CTRL1 = 1.5V, PWM1 = 2V, 65 μA PWM2, PWM3, LED_ISP and LED_ISN = 0V ISN and ISP Pin Current at 0V ISN = ISP = 0V, PWM1 = 2V, PWM2 and PWM3 = 0V 390 μA ISN and ISP Pin Current at 0V, Dimming ISN = ISP = 0V, PWM1 = 0V, PWM2 and PWM3 = 0V 1 μA ISN and ISP Pin Current at 5V ISN = ISP = 5V, PWM1 = 2V, PWM2 and PWM3 = 0V 10 μA ISN and ISP Pin Current at 5V, Dimming ISN = ISP = 5V, PWM1 = 0V, PWM2 and PWM3 = 0V 1 μA OC Inductor Threshold, Rising (ISP-ISN) ISN = 3V 110 mV OC Inductor Threshold, Falling (ISP-ISN) ISN = 3V 75 mV
Internal VCC Regulator (INTVCC Pin)
Regulation Voltage 4.75 5 5.25 V Current Limit (INTVCC Short) INTVCC = 0V 50 mA 3744fa For more information www.linear.com/LT3744 3 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Typical Applications Package Description Typical Application Related Parts