LTC3879 ELECTRICAL CHARACTERISTICSThe l denotes the specifi cations which apply over the full operatingtemperature range, otherwise specifi cations are at TA = 25°C. VIN = 15V, unless otherwise noted.SYMBOLPARAMETERCONDITIONSMINTYPMAXUNITSInternal VCC Regulator Internal VCC Voltage 6V < VIN < 38V 5.15 5.3 5.45 V Internal VCC Load Regulation ICC = 0mA to 20mA –0.1 ±2 % PGOOD Output PGOOD Upper Threshold VFB Rising 7.8 10 12.2 % PGOOD Lower Threshold VFB Falling –7.8 –10 –12.2 % PGOOD Hysteresis VFB Returning 2 3.8 % PGOOD Low Voltage IPGOOD = 5mA 0.15 0.4 V PGOOD Turn-On Delay 12 μs Note 1: Stresses beyond those listed under Absolute Maximum Ratings Note 4: The LTC3879E is guaranteed to meet specifi cations from may cause permanent damage to the device. Exposure to any Absolute 0°C to 85°C. Specifi cations over the – 40°C to 85°C operating temperature Maximum Rating condition for extended periods may affect device range are assured by design, characterization and correlation with reliability and lifetime. statistical process controls. The LTC3879I is guaranteed to meet Note 2: T specifi cations over the full –40°C to 85°C operating temperature range. J is calculated from the ambient temperature TA and power dissipation PD, as follows: Note 5: Rise and fall time are measured using 10% and 90% levels. Delay T times are measured using 50% levels. J = TA + (PD • θJA) Note 3: The LTC3879 is tested in a feedback loop that adjusts VFB to achieve a specifi ed error amplifi er output voltage (ITH). 3879f 4
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