Datasheet LT3757, LT3757A (Analog Devices) - 4

LT3757/LT3757A
ELECTRICAL CHARACTERISTICS The
l
denotes the specifications which apply over the full operating temp- erature range, otherwise specifications are at TA = 25°C. VIN = 24V, SHDN/UVLO = 24V, SENSE = 0V, unless otherwise noted. PARAMETER CONDITIONS MIN TYP MAX UNITS
INTVCC Voltage to Bypass Internal LDO 7.5 V
Logic Inputs
SHDN/UVLO Threshold Voltage Falling VIN = INTVCC = 8V l 1.17 1.22 1.27 V SHDN/UVLO Input Low Voltage I(VIN) Drops Below 1µA 0.4 V SHDN/UVLO Pin Bias Current Low SHDN/UVLO = 1.15V 1.7 2 2.5 µA SHDN/UVLO Pin Bias Current High SHDN/UVLO = 1.30V 10 100 nA
Gate Driver
tr Gate Driver Output Rise Time CL = 3300pF (Note 5), INTVCC = 7.5V 22 ns tf Gate Driver Output Fall Time CL = 3300pF (Note 5), INTVCC = 7.5V 20 ns Gate VOL 0.05 V Gate VOH INTVCC –0.05 V
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings
Note 3:
The LT3757/LT3757A are tested in a feedback loop which servos may cause permanent damage to the device. Exposure to any Absolute VFBX to the reference voltages (1.6V and –0.8V) with the VC pin forced Maximum Rating condition for extended periods may affect device to 1.3V. reliability and lifetime.
Note 4:
FBX overvoltage lockout is measured at VFBX(OVERVOLTAGE) relative
Note 2:
The LT3757E/LT3757AE are guaranteed to meet performance to regulated VFBX(REG). specifications from the 0°C to 125°C junction temperature. Specifications
Note 5:
Rise and fall times are measured at 10% and 90% levels. over the –40°C to 125°C operating junction temperature range are
Note 6:
For V assured by design, characterization and correlation with statistical process IN below 6V, the SHDN/UVLO pin must not exceed VIN. controls. The LT3757I/LT3757AI are guaranteed over the full –40°C to
Note 7:
SHDN/UVLO = 1.33V when VIN = 2.9V. 125°C operating junction temperature range. The LT3757H/LT3757AH are
Note 8:
The LT3757/LT3757A include overtemperature protection that guaranteed over the full –40°C to 150°C operating junction temperature is intended to protect the device during momentary overload conditions. range. High junction temperatures degrade operating lifetimes. Operating Junction temperature will exceed the maximum operating junction lifetime is derated at junction temperatures greater than 125°C. The temperature when overtemperature protection is active. Continuous LT3757MP/LT3757AMP are 100% tested and guaranteed over the full operation above the specified maximum operating junction temperature –55°C to 150°C operating junction temperature range. may impair device reliability.
TYPICAL PERFORMANCE CHARACTERISTICS TA = 25°C, unless otherwise noted. Positive Feedback Voltage Negative Feedback Voltage Quiescent Current vs Temperature, VIN vs Temperature, VIN vs Temperature, VIN
1605 –788 1.8 VIN = 40V –790 VIN = INTVCC = 2.9V 1600 SHDN/UVLO = 1.33V VIN = 24V –792 1.7 VIN = 40V VIN = 24V 1595 –794 V V IN = 8V IN = 8V –796 1.6 1590 –798 VIN = INTVCC = 2.9V VIN = 40V SHDN/UVLO = 1.33V –800 1.5 1585 VIN = 24V QUIESCENT CURRENT (mA) REGULATED FEEDBACK VOLTAGE (mV) REGULATED FEEDBACK VOLTAGE (mV) –802 VIN = INTVCC = 2.9V 1580 –804 1.4 –75 –50 –25 0 25 50 75 100 125 150 –75 –50 –25 0 25 50 75 100 125 150 –75 –50 –25 0 25 50 75 100 125 150 TEMPERATURE (°C) TEMPERATURE (°C) TEMPERATURE (°C) 3757 G01 3757 G02 3757 G03 Rev. F 4 For more information www.analog.com Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Applications Information Typical Applications Package Description Revision History Typical Application Related Parts