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LTM4612 Datasheet(PDF) 3 Page - Linear Technology |
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LTM4612 Datasheet(HTML) 3 Page - Linear Technology |
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3 / 24 page  LTM4612 3 4612f ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full internal operating temperature range, otherwise specifications are at TA = 25°C, VIN = 24V, unless otherwise noted. Per Typical Application (front page) configuration. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS IQ(VIN) Input Supply Bias Current VIN = 36V, No Switching VIN = 36V, VOUT = 12V, Switching Continuous VIN = 24V, No Switching VIN = 24V, VOUT = 12V, Switching Continuous Shutdown, RUN = 0, VIN = 36V 4.5 57 3.5 48 50 mA mA mA mA μA IS(VIN) Input Supply Current VIN = 36V, VOUT = 12V, IOUT = 5A VIN = 24V, VOUT = 12V, IOUT = 5A 1.85 2.72 A A VINTVCC Internal VCC Voltage VIN = 36V, RUN > 2V, IOUT = 0A 4.7 5 5.3 V Output Specifications IOUT(DC) Output Continuous Current Range VIN = 24V, VOUT = 12V (Note 4) 0 5 A ΔVOUT(LINE) VOUT Line Regulation Accuracy VOUT = 12V, FCB = 0V, VIN = 22V to 36V, IOUT = 0A l 0.05 0.3 % ΔVOUT(LOAD) VOUT Load Regulation Accuracy VOUT = 12V, FCB = 0V, IOUT = 0A to 5A (Note 4) VIN = 36V VIN = 24V l l 0.3 0.3 0.6 0.6 % % VIN(AC) Input Ripple Voltage IOUT = 0A, CIN = 2 × 10μF X5R Ceramic and 1 × 100μF Electrolytic, 1 × 10μF X5R Ceramic on VD Pins VIN = 24V, VOUT = 5V VIN = 24V, VOUT = 12V 7.2 3.4 mVP-P mVP-P VOUT(AC) Output Ripple Voltage IOUT = 0A, COUT = 2 × 22μF, 2 × 47μF X5R Ceramic VIN = 24V, VOUT = 5V VIN = 24V, VOUT = 12V 17.5 12.5 mVP-P mVP-P fS Output Ripple Voltage Frequency IOUT = 1A, VIN = 24V, VOUT = 12V 940 kHz ΔVOUT(START) Turn-On Overshoot, TRACK/SS = 10nF COUT = 200μF, VOUT = 12V, IOUT = 0A VIN = 36V VIN = 24V 20 20 mV mV tSTART Turn-On Time, TRACK/SS = Open COUT = 300μF, VOUT = 12V, IOUT = 1A Resistive Load VIN = 36V VIN = 24V 0.5 0.5 ms ms ΔVOUT(LS) Peak Deviation for Dynamic Load Load: 0% to 50% to 0% of Full Load COUT = 2 × 22μF Ceramic, 150μF Bulk VIN = 24V, VOUT = 12V 153 mV tSETTLE Settling Time for Dynamic Load Step Load: 0% to 50% to 0% of Full Load, VIN = 24V 37 μs IOUT(PK) Output Current Limit COUT = 200μF VIN = 36V, VOUT = 12V VIN = 24V, VOUT = 12V 9 9 A A Control Section VFB Voltage at VFB Pin IOUT = 0A, VOUT = 12V l 0.594 0.6 0.606 V VRUN RUN Pin On/Off Threshold 1 1.5 1.9 V ISS/TRACK Soft-Start Charging Current VSS/TRACK = 0V –1 –1.5 –2 μA VFCB Forced Continuous Threshold 0.57 0.6 0.63 V IFCB Forced Continuous Pin Current VFCB = 0V –1 –2 μA tON(MIN) Minimum On-Time (Note 3) 50 100 ns tOFF(MIN) Minimum Off-Time (Note 3) 250 400 ns |
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