LT8490 elecTrical characTerisTicsThe l denotes the specifications which apply over the full operatingtemperature range, otherwise specifications are at TA = 25°C. VIN = 12V, VDD = AVDD = 3.3V, SHDN = 3V unless otherwise noted. (Note 3) PARAMETERCONDITIONSMINTYPMAXUNITSVoltage Supply and Regulators VIN Operating Voltage Range (Note 7) l 6 80 V VIN Quiescent Current Not Switching, VEXTVCC = 0, VDD = AVDD = Float 2.65 4.2 mA VIN Quiescent Current in Shutdown VSHDN = 0V 0 1 µA VDD Quiescent Current IAVDD + IVDD, VDD = AVDD = 3.3V l 2.5 4 6.5 mA EXTVCC Switchover Voltage IINTVCC = 20mA, VEXTVCC Rising l 6.15 6.4 6.6 V EXTVCC Switchover Hysteresis 0.18 V LDO33 Pin Voltage 5mA from LDO33 Pin l 3.23 3.295 3.35 V LDO33 Pin Load Regulation ILDO33 = 0.1mA to 5mA –0.25 –1 % LDO33 Pin Current Limit l 12 17.25 22 mA LDO33 Pin Undervoltage Lockout LDO33 Falling 2.96 3.04 3.12 V LDO33 Pin Undervoltage Lockout Hysteresis 35 mV Switching Regulator Control SHDN Input Voltage High SHDN Rising to Enable the Device l 1.184 1.234 1.284 V SHDN Input Voltage High Hysteresis 50 mV SHDN Input Voltage Low Device Disabled, Low Quiescent Current l 0.35 V SHDN Pin Bias Current VSHDN = 3V 0 1 µA VSHDN = 12V 11 22 µA SWEN Rising Threshold Voltage l 1.156 1.206 1.256 V SWEN Threshold Voltage Hysteresis 22 mV MODE Pin Thresholds Discontinuous Mode l 2.3 V Forced Continuous Mode l 0.4 V IMON_OUT Rising threshold for CCM Operation MODE = 0V l 168 195 224 mV IMON_OUT Falling threshold for DCM MODE = 0V l 95 122 150 mV Voltage Regulation Regulation Voltage for FBOUT VC = 1.2V, EXTVCC = 0V l 1.193 1.207 1.222 V Regulation Voltage for FBIN VC = 1.2V, EXTVCC = 0V l 1.184 1.205 1.226 V FBOUT Pin Bias Current Current Out of Pin 15 nA FBIN Pin Bias Current Current Out of Pin 10 nA Current Regulation Regulation Voltage for IMON_IN and IMON_OUT VC = 1.2V, EXTVCC = 0V l 1.187 1.208 1.229 V IMON_IN Output Current VCSPIN – VCSNIN = 50mV, VCSPIN = 5.025V 54 57 60 µA VCSPIN – VCSNIN = 50mV, VCSPIN = 5.025V l 53 57 61 µA VCSPIN – VCSNIN = 0mV, VCSPIN = 5V l 2.5 7 11.5 µA IMON_IN Overvoltage Threshold l 1.55 1.61 1.67 V IMON_OUT Output Current VCSPOUT – VCSNOUT = 50mV, VCSPOUT = 5.025V 47.5 50 52.5 µA VCSPOUT – VCSNOUT = 50mV, VCSPOUT = 5.025V l 47 50 54.25 µA VCSPOUT – VCSNOUT = 5mV, VCSPOUT = 5.0025V 3.25 5 6.75 µA VCSPOUT – VCSNOUT = 5mV, VCSPOUT = 5.0025V l 2.75 5 8 µA IMON_OUT Overvoltage Threshold l 1.55 1.61 1.67 V 8490fa For more information www.linear.com/LT8490 3 Document Outline Features Applications Typical Application Description Absolute Maximum Ratings Order Information Pin Configuration Electrical Characteristics Typical Performance Characteristics Pin Functions Block Diagram Operation Applications Information Package Description Revision History Typical Application Related Parts
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