Datasheet LT3761, LT3761-1 (Analog Devices) - 4

LT3761/LT3761-1
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, CTRL = 2V, PWM = 5V, unless otherwise noted. PARAMETER CONDITIONS MIN TYP MAX UNITS
INTVCC Undervoltage Lockout EN/UVLO = 2V l 3.9 4.1 4.4 V INTVCC Current Limit INTVCC = 6V, 8V ≤ VIN ≤ 60V 30 36 42 mA INTVCC Current in Shutdown EN/UVLO = 0V, INTVCC = 8V 8 13 µA
Logic Inputs/Outputs
EN/UVLO Threshold Voltage Falling l 1.18 1.220 1.26 V EN/UVLO Rising Hysteresis 20 mV EN/UVLO Input Low Voltage IVIN Drops Below 1µA 0.4 V EN/UVLO Pin Bias Current Low EN/UVLO = 1.15V l 1.7 2.3 2.7 µA EN/UVLO Pin Bias Current High EN/UVLO = 1.33V 10 100 nA OPENLED Output Low IOPENLED = 1mA (LT3761 Only) 200 mV
PWM Pin Signal Generator
PWM Falling Threshold l 0.78 0.83 0.88 V PWM Threshold Hysteresis (VPWMHYS) IDIM/SS = 0µA 0.35 0.4 0.6 V PWM Pull-Up Current (IPWMUP) PWM = 0.7V, IDIM/SS = 0µA 6 7.5 9 µA PWM Pull-Down Current (IPWMDN) PWM = 1.5V, IDIM/SS = 0µA 68 88 110 µA PWM Fault Mode Pull-Down Current INTVCC = 3.8V 1.5 mA PWMOUT Duty Ratio for PWM Signal Generator (Note 5) IDIM/SS = –6.5µA 3.1 4.1 5.2 % IDIM/SS = 0µA 6.8 7.9 9.2 % IDIM/SS = 21.5µA 40 47.8 56 % IDIM/SS = 52µA 95 96.5 98 % PWMOUT Signal Generator Frequency PWM = 47nF to GND, IDIM/SS = 0µA 215 300 435 Hz
PWMOUT, Gate Pin Drivers
PWMOUT Driver Output Rise Time (tr) CL = 560pF 35 ns PWMOUT Driver Output Fall Time (tf) CL = 560pF 35 ns PWMOUT Output Low (VOL) PWM = 0V 0.05 V PWMOUT Output High (VOH) INTVCC – V 0.05 GATE Output Rise Time (tr) CL = 3300pF 25 ns GATE Output Fall Time (tf) CL = 3300pF 25 ns GATE Output Low (VOL) 0.1 V GATE Output High (VOH) INTVCC – V 0.05
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings 125°C operating junction temperature range. The LT3761H is guaranteed may cause permanent damage to the device. Exposure to any Absolute over the full –40°C to 150°C operating junction temperature range. Maximum Rating condition for extended periods may affect device Operating lifetime is derated at junction temperatures greater than 125°C. reliability and lifetime.
Note 4:
The LT3761/LT3761-1 includes overtemperature protection that
Note 2:
Do not apply a positive or negative voltage or current source to is intended to protect the device during momentary overload conditions. GATE or PWMOUT pins, otherwise permanent damage may occur. Junction temperature will exceed the maximum operating junction
Note 3:
The LT3761E/LT3761E-1 is guaranteed to meet performance temperature when overtemperature protection is active. Continuous specifications from the 0°C to 125°C junction temperature. Specifications operation above the specified maximum junction temperature may impair over the –40°C to 125°C operating junction temperature range are device reliability. assured by design, characterization and correlation with statistical process
Note 5:
PWMOUT Duty Ratio is calculated: controls. The LT3761I/LT3761I-1 is guaranteed over the full –40°C to Duty = IPWMUP/(IPWMUP + IPWMDN) 37611fb 4 For more information www.linear.com/LT3761 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 Revision History Typical Application Related Parts