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LTM4656 数据表(PDF) 3 Page - Analog Devices |
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LTM4656 数据表(HTML) 3 Page - Analog Devices |
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3 / 28 page  LTM4656/LTM4656-1 3 Rev. 0 For more information www.analog.com ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the specified operating temperature range, otherwise specifications are at TA = 25°C. (Note 2), VIN = 12, VBIAS = BVIN, SHDN = VIN per the typical application. SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS Input/Output Section VIN Input DC Voltage Note 4 l 4.5 28 V VOUT(RANGE) Output Voltage Range Note 4, VIN = 5V for 6V output l 6 36 V VOUT(DC) Output Voltage, Total Variation with Line and Load RFB = 11.5k, MODE_PLLIN = INTVCC VIN = 12V, IOUT = 0A to 4A l 23.52 24 24.48 V IQ(VIN) Input Supply Bias Current VIN = 12V, VOUT = 24V, MODE_PLLIN = INTVCC VIN = 12V, VOUT = 24V, MODE/PLLIN = GND Shutdown, SDHN = 0, VIN = 12V 1.7 76 230 mA mA µA IS(VIN) Input Supply Current VIN = 12V, VOUT = 24V, IOUT = 4A 8 A IINRUSH(VIN) Input Inrush Current at Startup CIN = 10µF × 2, 150µF; COUT = 10µF × 2 Ceramic, 150µF VIN = 12V, VOUT = 24V, TRACK/SS = 0.1µF 0.5 A IOUT(DC) Output Continuous Current Range Note 4 VIN = 5V, VOUT = 12V (Note 4) VIN =12V, VOUT = 24V 0 0 3.5 4 A A IIN Limit Range Input Current Limit See Typical Applications Based on Internal 0.004 RSENSE and 50mV Trip Typical 10.6 12.5 14 A ∆VOUT(LINE)/VOUT Line Regulation Accuracy VOUT = 24V, VIN = 5 to 12V, IOUT = 0A l 0.1 0.2 %/V ∆VOUT(LOAD)/VOUT Load Regulation Accuracy VIN = 12V, VOUT = 24V, IOUT = 0A to 4.0A l 0.3 0.6 % VOUT(AC) Output Ripple Voltage IOUT = 0A, COUT = 10µF Ceramic × 2, 150µF Aluminum, VIN = 12V, VOUT = 24V 200 mV ∆VOUT(START) Turn-On Overshoot IOUT = 0A, COUT = 10µF Ceramic × 2, 150µF Aluminum, SS = 0.1µF, VIN = 12V, VOUT = 24V 100 mV tSTART Turn-On Time IOUT = 0A, COUT = 10µF Ceramic × 2, 150µF Aluminum, SS = 0.01µF, VIN = 12V, VOUT = 24V 1 ms ∆VOUTLS Peak Deviation for Dynamic Load Load: 0% to 50% to 0% of Full Load COUT = 10µF Ceramic × 2, 150µF Aluminum, VIN = 12V, VOUT = 24V 200 mV tSETTLE Settling Time for Dynamic Load Step Load: 0% to 50% to 0% of Full Load COUT = 10µF Ceramic × 2, 150µF Aluminum, VIN = 12V, VOUT = 24V 200 µs Regulator Specifics VFB Voltage at VFB Pin IOUT = 0A, VIN = 12V, VOUT = 24V l 1.180 1.200 1.220 V IFB Current at VFB Pin (Note 6) ±5 ±50 nA RFBHI Resistor Between VOUT and VFB Pins 221 kΩ SS (I) Track Pin Soft-Start Pull-Up Current VSS = 0V 7 10 13 µA DCMAX Maximum Duty Cycle FB = 1.0V (Note 6) 96 % VINTVCC Internal VCC Voltage 6V < VIN < 20V 5.2 5.4 5.6 V VINTVCC(LOAD) INTVCC Load Regulation ICC = 0mA to 50mA 0.5 2 % UVLO INTVCC UVLO Thresholds VINTVCC Ramping Up VINTVCC Ramping Down (Note 6) 3.6 4.3 3.8 4.5 V V fS Typical Output Ripple Voltage Frequency VIN = 12V, VOUT = 24V, RfSET = Selectable 350 500 kHz fSYNC SYNC Frequency Range 350 780 kHz fLOW Lowest Frequency RfSET = 47.5k 350 kHz fNOM Nominal Frequency RfSET =68.1k 500 kHz fHIGH Highest Frequency RfSET = 95.3k 750 kHz tON(MIN) Minimum On-Time Note 3 110 ns |
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