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LTC3727 Datasheet(PDF) 4 Page - Linear Technology |
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LTC3727 Datasheet(HTML) 4 Page - Linear Technology |
4 / 32 page 4 LTC3727/LTC3727-1 3727f Note 1: Absolute Maximum Ratings are those values beyond which the life of a device may be impaired. Note 2: The LTC3727E/LTC3727E-1 are guaranteed to meet performance specifications from 0 °C to 70°C. Specifications over the –40°C to 85°C operating temperature range are assured by design, characterization and correlation with statistical process controls. Note 3: TJ is calculated from the ambient temperature TA and power dissipation PD according to the following formulas: LTC3727EG/LTC3727EG-1: TJ = TA + (PD • 95 °C/W) LTC3727EUH-1: TJ = TA + (PD • 34 °C/W) Efficiency vs Output Current and Mode (Figure 13) Efficiency vs Output Current (Figure 13) Efficiency vs Input Voltage (Figure 13) TYPICAL PERFOR A CE CHARACTERISTICS OUTPUT CURRENT (A) 0.001 0 10 30 40 50 100 70 0.01 0.1 1 3727 G01 20 80 90 60 10 FORCED CONTINUOUS MODE Burst Mode OPERATION VIN = 15V VOUT = 8.5V CONSTANT FREQUENCY (BURST DISABLE) OUTPUT CURRENT (A) 0.001 70 80 10 3727 G02 60 50 0.01 0.1 1 100 90 VIN = 10V VIN = 15V VIN = 7V VIN = 20V VOUT = 5V INPUT VOLTAGE (V) 5 70 80 3727 G03 60 50 15 25 35 100 VOUT = 5V IOUT = 3A 90 The q denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VIN = 15V, VRUN/SS1, 2 = 5V unless otherwise noted. ELECTRICAL CHARACTERISTICS SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS 3.3V Linear Regulator V3.3OUT 3.3V Regulator Output Voltage No Load q 3.25 3.35 3.45 V V3.3IL 3.3V Regulator Load Regulation I3.3 = 0mA to 10mA 0.5 2.5 % V3.3VL 3.3V Regulator Line Regulation 6V < VIN < 30V (LTC3727) 0.05 0.2 % 6V < VIN < 30V (LTC3727-1) 0.05 0.3 % PGOOD Output VPGL PGOOD Voltage Low IPGOOD = 2mA 0.1 0.3 V IPGOOD PGOOD Leakage Current VPGOOD = 5V ±1 µA VPG PGOOD Trip Level, Either Controller VOSENSE with Respect to Set Output Voltage VOSENSE Ramping Negative – 6 –7.5 – 9.5 % VOSENSE Ramping Positive 6 7.5 9.5 % Note 4: The LTC3727/LTC3727-1 are tested in a feedback loop that servos VITH1, 2 to a specified voltage and measures the resultant VOSENSE1, 2. Note 5: Dynamic supply current is higher due to the gate charge being delivered at the switching frequency. See Applications Information. Note 6: Rise and fall times are measured using 10% and 90% levels. Delay times are measured using 50% levels. Note 7: The minimum on-time condition is specified for an inductor peak-to-peak ripple current ≥40% of IMAX (see minimum on-time considerations in the Applications Information section). |
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