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LTC3862IUH-TRPBF Datasheet(PDF) 4 Page - Linear Technology |
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LTC3862IUH-TRPBF Datasheet(HTML) 4 Page - Linear Technology |
4 / 40 page LTC3862 4 3862fb SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS fSYNC SYNC Minimum Input Frequency VSYNC = External Clock l 50 kHz SYNC Maximum Input Frequency VSYNC = External Clock l 650 kHz VSYNC SYNC Input Threshold Rising Threshold 1.5 V IPLLFLTR Phase Detector Sourcing Output Current fSYNC > fOSC –15 μA Phase Detector Sinking Output Current fSYNC < fOSC 15 μA CH1-CH2 Channel 1 to Channel 2 Phase Relationship VPHASEMODE = 0V VPHASEMODE = Float VPHASEMODE = 3V8 180 180 120 Deg Deg Deg CH1-CLKOUT Channel 1 to CLKOUT Phase Relationship VPHASEMODE = 0V VPHASEMODE = Float VPHASEMODE = 3V8 90 60 240 Deg Deg Deg DMAX Maximum Duty Cycle VDMAX = 0V VDMAX = Float VDMAX = 3V8 96 84 75 % % % tON(MIN)1 Minimum On-Time VBLANK = 0V (Note 8) 180 ns tON(MIN)2 Minimum On-Time VBLANK = Float (Note 8) 260 ns tON(MIN)3 Minimum On-Time VBLANK = 3V8 (Note 8) 340 ns Gate Driver RDS(ON) Driver Pull-Up RDS(ON) 2.1 Ω Driver Pull-Down RDS(ON) 0.7 Ω Overvoltage VFB(OV) VFB, Overvoltage Lockout Threshold VFB(OV) – VFB(NOM) in Percent 8 10 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: All currents into device pins are positive; all currents out of device pins are negative. All voltages are referenced to ground unless otherwise specified. Note 3: The LTC3862E is guaranted 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 LTC3862I is guaranteed over the full –40°C to 125°C operating junction temperature range and the LTC3862H is guaranteed over the full –40°C to 150°C operating junction temperature range. High junction temperatures degrade operating lifetimes. Operating lifetime is derated at junction temperatures greater than 125°C. Note 4: This IC includes overtemperature protection that is intended to protect the device during momentary overload conditions. Continuous operation above the specified maximum operating junction temperature may impair device reliability. Note 5: Supply current in normal operation is dominated by the current needed to charge the external MOSFET gates. This current will vary with supply voltage and the external MOSFETs used. Note 6: The IC is tested in a feedback loop that adjusts VFB to achieve a specified error amplifier output voltage. Note 7: Guaranteed by design, not subject to test. Note 8: The minimum on-time condition is specified for an inductor peak- to-peak ripple current = 30% (see Minimum On-Time Considerations in the Applications Information section). ELECTRICAL CHARACTERISTICS (Notes 2, 3) The l denotes the specifications which apply over the full operating junction temperature range, otherwise specifications are at TA = 25°C. VIN = 12V, RUN = 2V and SS = open, unless otherwise noted. |
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