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LTC3828 Datasheet(PDF) 3 Page - Linear Technology |
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LTC3828 Datasheet(HTML) 3 Page - Linear Technology |
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3 / 32 page  LTC3828 3828f 3 The ● denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VIN = 15V, VRUN1, 2 = 5V unless otherwise noted. ELECTRICAL CHARACTERISTICS SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS gmGBW1, 2 Transconductance Amplifier GBW ITH1, 2 = 1.2V; (Note 3) 3 MHz IQ Input DC Supply Current (Note 4) Normal Mode VIN = 15V; VOUT1 = 5V 2 3 mA Shutdown VRUN/SS1, 2 = 0V 20 100 µA VFCB Forced Continuous Threshold ● 0.76 0.800 0.84 V IFCB Forced Continuous Pin Current VFCB = 0.85V – 0.50 – 0.18 – 0.1 µA VBINHIBIT Burst Inhibit (Constant Frequency) Measured at FCB pin 4.3 4.8 V Threshold UVLO Undervoltage Lockout VIN Ramping Down ● 3.5 4 V VOVL Feedback Overvoltage Lockout Measured at VOSENSE1, 2 ● 0.84 0.86 0.88 V ISENSE Sense Pins Total Source Current (Each Channel); VSENSE1–, 2– = VSENSE1+, 2+ = 0V – 90 – 65 µA DFMAX Maximum Duty Factor In Dropout 98 99.4 % ITRCKSS1,2 Soft-Start Charge Current 0.5 1.2 µA VRUN1, 2 ON RUN Pin ON Threshold VRUN1, VRUN2 Rising 1.0 1.5 2.0 V VSENSE(MAX) Maximum Current Sense Threshold VOSENSE1, 2 = 0.7V,VSENSE1–, 2– = 5V 62 75 85 mV VOSENSE1, 2 = 0.7V,VSENSE1–, 2– = 5V ● 60 75 88 mV TG Transition Time: (Note 5) TG1, 2 tr Rise Time CLOAD = 3300pF 55 100 ns TG1, 2 tf Fall Time CLOAD = 3300pF 55 100 ns BG Transition Time: (Note 5) BG1, 2 tr Rise Time CLOAD = 3300pF 65 120 ns BG1, 2 tf Fall Time CLOAD = 3300pF 55 100 ns TG/BG t1D Top Gate Off to Bottom Gate On Delay Synchronous Switch-On Delay Time CLOAD = 3300pF Each Driver 60 ns BG/TG t2D Bottom Gate Off to Top Gate On Delay Top Switch-On Delay Time CLOAD = 3300pF Each Driver 80 ns tON(MIN) Minimum On-Time Tested with a Square Wave (Note 6) 120 ns INTVCC Linear Regulator VINTVCC Internal VCC Voltage 6V < VIN < 30V 4.8 5.0 5.2 V VLDO INT INTVCC Load Regulation ICC = 0 to 20mA 0.2 2.0 % Oscillator and Phase-Locked Loop fNOM Nominal Frequency VPLLFLTR = 1.2V 360 400 440 kHz fLOW Lowest Frequency VPLLFLTR = 0V 230 260 290 kHz fHIGH Highest Frequency VPLLFLTR ≥ 2.4V 480 550 590 kHz IPLLFLTR Phase Detector Output Current Sinking Capability fPLLIN < fOSC –17 µA Sourcing Capability fPLLIN > fOSC 17 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, 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 % |
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