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LTM4618EVPBF 数据表(PDF) 3 Page - Linear Technology |
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LTM4618EVPBF 数据表(HTML) 3 Page - Linear Technology |
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3 / 24 page  LTM4618 3 4618f ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C (Note 2), VIN = 12V, per typical application in Figure 21. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS IQ(VIN) Input Supply Bias Current VIN = 12V, VOUT = 2.5V, IOUT = 0A VIN = 26.5V, VOUT = 2.5V, IOUT = 0A Shutdown, RUN = 0, VIN = 26.5V 26 20 80 mA mA μA IS(VIN) Input Supply Current VIN = 12V, VOUT = 2.5V, IOUT = 6A VIN = 26.5V, VOUT = 2.5V, IOUT = 6A 1.430 0.675 A A INTVCC Internal VCC Voltage VIN = 12V, VRUN > 2V, No Load 4.8 5 5.2 V VEXTVCC EXTVCC Switchover Voltage EXTVCC Ramping Positive l 4.5 4.7 V VLDO External EXTVCC Voltage Drop INTVCC = 20mA, VEXTVCC = 5V 50 100 mV VEXTVCC Hysteresis EXTVCC Hysteresis 200 mV Output Specifications IOUT(DC) Output Continuous Current Range VIN = 12V, VOUT = 2.5V (Note 4) 0 6 A ΔVOUT(LINE) VOUT Line Regulation Accuracy VOUT = 2.5V, VIN from 6V to 26.5V IOUT = 0A l 0.02 0.04 %/V ΔVOUT(LOAD) VOUT Load Regulation Accuracy VIN = 12V, VOUT = 2.5V, 0 to 6A (Note 4) l 0.3 0.6 % VOUT(AC) Output Ripple Voltage IOUT = 0A, COUT = 100μF ×3 X5R Ceramic VIN = 12V, VOUT = 2.5V VIN = 26.5V, VOUT = 2.5V 10 12 mV mV fS Output Ripple Voltage Frequency IOUT = 2A, VIN = 12V, VOUT = 2.5V, VFREQ = INTVCC 780 kHz ΔVOUT(START) Turn-On Overshoot COUT = 100μF ×3 X5R Ceramic VOUT = 2.5V, IOUT = 0A VIN = 12V VIN = 26.5V 20 20 mV mV tSTART Turn-On Time COUT = 100μF ×3 X5R Ceramic, VOUT = 2.5V, IOUT = 0A, TK/SS Capacitor = 0.01μF VIN = 12V VIN = 26.5V 0.75 0.70 ms ms ΔVOUTLS Peak Deviation for Dynamic Load Load: 0% to 50% of Full Load COUT = 100μF ×3 X5R Ceramic, VOUT = 2.5V VIN = 12V 15 mV tSETTLE Settling Time for Dynamic Load Step Load: 0% to 50% of Full Load COUT = 100μF ×3 X5R Ceramic, VOUT = 2.5V VIN = 12V 10 μs IOUT(PK) Output Current Limit COUT = 100μF ×3 X5R Ceramic VIN = 6V, VOUT = 2.5V VIN = 26.5V, VOUT = 2.5V 11 11 A A Control Section VFB Error Amplifier Feedback Voltage IOUT = 0A, VOUT = 2.5V l 0.792 0.788 0.8 0.8 0.808 0.808 V V IFB Error Amplifier Feedback Current (Note 3) –10 –50 nA VOVL Feedback Voltage Lockout Measured at VFB 0.84 0.86 0.88 V ITK/SS Soft-Start Charge Current VTK/SS = 0V 0.9 1.3 1.7 μA DFMAX Maximum Duty Factor In Dropout (Note 3) 97 % tON(MIN) Minimum On-Time (Note 3) 90 ns fNOM Nominal Frequency VFREQ = 1.2V 450 500 550 kHz fLOW Lowest Frequency VFREQ = 0V 210 250 290 kHz |
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