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LTC3780IUH Datasheet(PDF) 4 Page - Linear Technology |
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LTC3780IUH Datasheet(HTML) 4 Page - Linear Technology |
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4 / 30 page  LTC3780 4 3780ff For more information www.linear.com/LTC3780 elecTrical characTerisTics The l denotes the specifications which apply over the full operating junction temperature range, otherwise specifications are at TA = 25°C. (Note 7) VIN = 15V unless otherwise noted. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS DF MAX, Boost Maximum Duty Factor % Switch C On 99 % DF MAX, Buck Maximum Duty Factor % Switch A On (in Dropout) 99 % VRUN(ON) RUN Pin On Threshold VRUN Rising 1 1.5 2 V ISS Soft-Start Charge Current VRUN = 2V 0.5 1.2 µA VSENSE(MAX) Maximum Current Sense Threshold Boost: VOSENSE = VREF – 50mV Buck: VOSENSE = VREF – 50mV l l 120 –95 160 –110 185 –150 mV mV VSENSE(MIN,BUCK) Minimum Current Sense Threshold Discontinuous Mode –6 mV TG1, TG2 tr TG Rise Time CLOAD = 3300pF (Note 5) 50 ns TG1, TG2 tf TG Fall Time CLOAD = 3300pF (Note 5) 45 ns BG1, BG2 tr BG Rise Time CLOAD = 3300pF (Note 5) 45 ns BG1, BG2 tf BG Fall Time CLOAD = 3300pF (Note 5) 55 ns TG1/BG1 t1D TG1 Off to BG1 On Delay, Switch C On Delay CLOAD = 3300pF Each Driver 80 ns BG1/TG1 t2D BG1 Off to TG1 On Delay, Synchronous Switch D On Delay CLOAD = 3300pF Each Driver 80 ns TG2/BG2 t3D TG2 Off to BG2 On Delay, Synchronous Switch B On Delay CLOAD = 3300pF Each Driver 80 ns BG2/TG2 t4D BG2 Off to TG2 On Delay, Switch A On Delay CLOAD = 3300pF Each Driver 80 ns Mode Transition 1 BG1 Off to BG2 On Delay, Switch A On Delay CLOAD = 3300pF Each Driver 250 ns Mode Transition 2 BG2 Off to BG1 On Delay, Synchronous Switch D On Delay CLOAD = 3300pF Each Driver 250 ns tON(MIN,BOOST) Minimum On-Time for Main Switch in Boost Operation Switch C (Note 6) 200 ns tON(MIN,BUCK) Minimum On-Time for Synchronous Switch in Buck Operation Switch B (Note 6) 180 ns Internal VCC Regulator VINTVCC Internal VCC Voltage 7V < VIN < 30V, VEXTVCC = 5V l 5.7 6 6.3 V ∆VLDO(LOADREG) Internal VCC Load Regulation ICC = 0mA to 20mA, VEXTVCC = 5V 0.2 2 % VEXTVCC EXTVCC Switchover Voltage ICC = 20mA, VEXTVCC Rising l 5.4 5.7 V ∆VEXTVCC(HYS) EXTVCC Switchover Hysteresis 300 mV ∆VEXTVCC EXTVCC Switch Drop Voltage ICC = 20mA, VEXTVCC = 6V 150 300 mV Oscillator and Phase-Locked Loop fNOM Nominal Frequency VPLLFLTR = 1.2V 260 300 330 kHz fLOW Lowest Frequency VPLLFLTR = 0V 170 200 220 kHz fHIGH Highest Frequency VPLLFLTR = 2.4V 340 400 440 kHz RPLLIN PLLIN Input Resistance 50 kΩ IPLLLPF Phase Detector Output Current fPLLIN < fOSC fPLLIN > fOSC (Note 9) –15 15 µA µA |
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