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LTC3780 Datasheet(PDF) 3 Page - Linear Technology |
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LTC3780 Datasheet(HTML) 3 Page - Linear Technology |
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3 / 28 page  3 LTC3780 3780f VREF(LINEREG) Reference Voltage Line Regulation VIN = 4V to 30V, ITH = 1.2V (Note 3) 0.002 0.02 %/V gm(EA) Error Amplifier Transconductance ITH = 1.2V, Sink/Source = 3µA (Note 3) 0.32 mS gm(GBW) Error Amplifier GBW 0.6 MHz IQ Input DC Supply Current (Note 4) Normal 2400 µA Standby VRUN = 0V, VSTBYMD > 2V 1500 µA Shutdown Supply Current VRUN = 0V, VSTBYMD = Open 55 70 µA VFCB Forced Continuous Threshold 0.76 0.800 0.84 V IFCB Forced Continuous Pin Current VFCB = 0.85V –0.30 –0.18 –0.1 µA VBINHIBIT Burst Inhibit (Constant Frequency) Measured at FCB Pin 5.3 5.5 V Threshold UVLO Undervoltage Reset VIN Falling ● 3.8 4 V VOVL Feedback Overvoltage Lockout Measured at VOSENSE Pin 0.84 0.86 0.88 V ISENSE Sense Pins Total Source Current VSENSE– = VSENSE+ = 0V –380 µA VSTBYMD(START) Start-Up Threshold VSTBYMD Rising 0.4 0.7 V VSTBYMD(KA) Keep-Alive Power-On Threshold VSTBYMD Rising, VRUN = 0V 1.25 V 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 ● 160 185 mV Buck: VOSENSE = VREF – 50mV ● –95 –130 –150 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, CLOAD = 3300pF Each Driver 80 ns Switch C On Delay BG1/TG1 t2D BG1 Off to TG1 On Delay, CLOAD = 3300pF Each Driver 80 ns Synchronous Switch D On Delay TG2/BG2 t3D TG2 Off to BG2 On Delay, CLOAD = 3300pF Each Driver 80 ns Synchronous Switch B On Delay BG2/TG2 t4D BG2 Off to TG2 On Delay, CLOAD = 3300pF Each Driver 80 ns Switch A On Delay Mode BG1 Off to BG2 On Delay, CLOAD = 3300pF Each Driver 90 ns Transition 1 Switch A On Delay Mode BG2 Off to BG1 On Delay, CLOAD = 3300pF Each Driver 90 ns Transition 2 Synchronous Switch D On Delay SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS The ● indicates specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. VIN = 15V unless otherwise noted. ELECTRICAL CHARACTERISTICS |
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