LT3759 ELECTRICAL CHARACTERISTICSThe l denotes the specifications which apply over the full operatingtemperature range, otherwise specifications are at TA = 25°C, VIN = 12V, EN/UVLO = 12V, INTVCC = 4.75V, unless otherwise noted. PARAMETERCONDITIONSMINTYPMAXUNITS VIN LDO Dropout Voltage (VIN – VINTVcc) VIN = 3V, DRIVE = 0V, l 190 400 mV IINTVCC = 20mA INTVCC Undervoltage Lockout Threshold Falling 1.3 1.45 V INTVCC Current in Shutdown EN/UVLO = 0V 22 µA Logic EN/UVLO Threshold Voltage Fal ing l 1.17 1.22 1.27 V EN/UVLO Rising Hysteresis 20 mV EN/UVLO Input Low Voltage IVIN < 1μA 0.4 V EN/UVLO Pin Bias Current Low EN/UVLO = 1.15V 1.8 2.2 2.6 µA EN/UVLO Pin Bias Current High EN/UVLO = 1.30V 10 100 nA FBX Power Good Threshold Voltage FBX > 0V, PGOOD Falling VFBX(REG) – 0.08 V FBX < 0V, PGOOD Falling VFBX(REG) + 0.04 V FBX Overvoltage Threshold FBX > 0V, PGOOD Rising VFBX(REG) + 0.12 V FBX < 0V, PGOOD Rising VFBX(REG) – 0.06 V PGOOD Output Low (VOL) IPGOOD = 250µA 210 300 mV PGOOD Leakage Current PGOOD = 42V 1 µA INTVCC Minimum Voltage to Enable PGOOD Function l 2.4 2.7 3.0 V INTVCC Minimum Voltage to Enable SYNC Function l 2.4 2.7 3.0 V NMOS Gate Drivers GATE Output Rise Time (TR) CL = 3300pF 20 ns GATE Output Fall Time (TF) CL = 3300pF 20 ns GATE Output Low (VOL) 0.05 V GATE Output High (VOH) INTVCC – 0.05 V Note 1: Stresses beyond those listed under Absolute Maximum Ratings range are assured by design, characterization and correlation with may cause permanent damage to the device. Exposure to any Absolute statistical process controls. The LT3759I is guaranteed over the full Maximum Rating condition for extended periods may affect device –40°C to 125°C operating junction temperature range. The LT3759H is reliability and lifetime. guaranteed over the full –40°C to 150°C operating junction temperature Note 2: For V range. High junction temperatures degrade operating lifetimes. Operating IN below 4V, the EN/UVLO pin must not exceed VIN for proper operation. lifetime is derated at junction temperatures greater than 125°C. Note 3: This pin is for switching purposes. Do not tie directly to a supply. Note 5: The LT3759 is tested in a feedback loop which servos VFBX to the Note 4: The LT3759E is guaranteed to meet performance specifications reference voltages (1.6V and –0.8V) with the VC pin forced to 1.3V. from the 0°C to 125°C operating junction temperature range. Note 6: Rise and fall times are measured at 10% and 90% levels. Specifications over the –40°C to 125°C operating junction temperature 3759fc 4 For more information www.linear.com/3759 Document Outline Features Applications Description Typical Application Absolute Maximum Ratings Pin Configuration Order Information Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Applications Information Typical Applications Package Description Revision History Related Parts
