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LTC3851-1 数据表(PDF) 4 Page - Linear Technology |
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LTC3851-1 数据表(HTML) 4 Page - Linear Technology |
4 / 28 page LTC3851-1 4 38511fa ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating junction temperature range, otherwise specifications are at TA = 25°C. VIN = 15V, VRUN = 5V unless otherwise noted. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS fHIGH Highest Frequency RFREQ = 36k 710 750 790 kHz RMODE/PLLIN MODE/PLLIN Input Resistance 100 kΩ fMODE MODE/PLLIN Minimum Input Frequency MODE/PLLIN Maximum Input Frequency VMODE = External Clock VMODE = External Clock 250 750 kHz kHz IFREQ Phase Detector Output Current Sinking Capability Sourcing Capability fMODE > fOSC fMODE < fOSC –10 10 μA μA 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 VFB with Respect to Set Regulated Voltage VFB Ramping Negative VFB Ramping Positive –12 8 –10 10 –8 12 % % Note 1: Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. Exposure to any Absolute Maximum Rating condition for extended periods may affect device reliability and lifetime. Note 2: The LTC3851E-1 is guaranteed to meet performance specifications from 0°C to 85°C. Specifications over the –40°C to 85°C operating junction temperature range are assured by design, characterization and correlation with statistical process controls. The LTC3851I-1 is guaranteed over the –40°C to 125°C operating junction temperature range. Note 3: TJ is calculated from the ambient temperature TA and power dissipation PD according to the following formulas: LTC3851MSE-1: TJ = TA + (PD • 90°C/W) LTC3851UD-1: TJ = TA + (PD • 68°C/W) Note 4: The LTC3851-1 is tested in a feedback loop that servos VITH to a specified voltage and measures the resultant VFB. 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). TYPICAL PERFORMANCE CHARACTERISTICS Efficiency vs Output Current and Mode Efficiency vs Output Current and Mode Efficiency vs Output Current and Mode LOAD CURRENT (mA) 10 40 50 60 70 80 100 1000 10000 100000 38511 G01 30 20 10 0 90 100 VIN = 12V VOUT = 1.5V BURST CCM PULSE SKIP LOAD CURRENT (mA) 10 40 50 60 70 80 100 1000 10000 100000 38511 G02 30 20 10 0 90 100 VIN = 12V VOUT = 3.3V FIGURE 11 CIRCUIT BURST CCM PULSE SKIP LOAD CURRENT (mA) 10 40 50 60 70 80 100 1000 10000 100000 38511 G03 30 20 10 0 90 100 VIN = 12V VOUT = 5V BURST CCM PULSE SKIP |
类似零件编号 - LTC3851-1_15 |
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类似说明 - LTC3851-1_15 |
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