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LTC4449 Datasheet(PDF) 5 Page - Analog Devices |
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LTC4449 Datasheet(HTML) 5 Page - Analog Devices |
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5 / 48 page  LTC7872 5 Rev. 0 For more information www.analog.com ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C, VHIGH = 48V, VRUN = 5V unless otherwise noted. (Note 2) SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS Current Sense Pin Voltage (VSNSD+ – VSNS–) to IMON Gain VILIM = 0V, 1/4 VV5 VILIM = Float, 3/4 VV5, VV5 40 20 V/V V/V Total DC Sense Signal Gain DCR Configuration 5 V/V Total DC Sense Signal Gain RSENSE Configuration 4 V/V VSENSE(MAX) (DCR Configuration) Maximum Current Sense Threshold (Buck and Boost Mode) VILIM = 0V VILIM = 1/4 VV5 VILIM = Float VILIM = 3/4 VV5 VILIM = VV5 l l l l l 6.5 17.0 27.0 36.0 44.0 10.0 20.0 30.0 40.0 50.0 13.5 23.0 33.0 44.0 56.0 mV mV mV mV mV VSENSE(MAX) (RSENSE Configuration) Maximum Current Sense Threshold (Buck and Boost Mode) VILIM = 0V VILIM = 1/4 VV5 VILIM = Float VILIM = 3/4 VV5 VILIM = VV5 l l l l l 8.1 21.2 33.7 45.0 55.0 12.5 25.0 37.5 50.0 62.5 16.9 28.8 41.3 55.0 70.0 mV mV mV mV mV VOCFT Overcurrent Fault Threshold, VSNSD+ – VSNS– VILIM = 0V VILIM = 1/4 VV5 VILIM = Float VILIM = 3/4 VV5 VILIM = VV5 l l l l l 31.0 43.0 54.0 65.0 76.0 37.5 50.0 62.5 75.0 87.5 44.0 57.0 71.0 85.0 99.0 mV mV mV mV mV VNOCFT Negative Overcurrent Fault Threshold, VSNSD+ – VSNS– VILIM = 0V VILIM = 1/4 VV5 VILIM = Float VILIM = 3/4 VV5 VILIM = VV5 l l l l l –45.0 –58.0 –72.0 –86.0 –100.0 –37.5 –50.0 –62.5 –75.0 –87.5 –30.0 –42.0 –53.0 –64.0 –75.0 mV mV mV mV mV Overcurrent Fault Threshold Hysteresis, |VSNSD+ – VSNS–| VILIM = 0V VILIM = 1/4 VV5, Float, 3/4 VV5, VV5 25 31 mV mV DRVCC and V5 Linear Regulators VDRVCC DRVCC Regulation Voltage 12V < VEXTVCC < 60V, VDRVSET = VV5 12V < VEXTVCC < 60V, VDRVSET = Float 12V < VEXTVCC < 60V, VDRVSET = 0V 9.5 7.6 4.8 10 8 5 10.5 8.4 5.2 V V V DRVCC Load Regulation IDRVCC = 0mA to 100mA, VEXTVCC = 14V 1.6 3.0 % EXTVCC Switchover Voltage EXTVCC Ramping Positive, VDRVSET = VV5 EXTVCC Ramping Positive, VDRVSET = Float EXTVCC Ramping Positive, VDRVSET = 0V 10.7 8.5 6.9 V V V EXTVCC Hysteresis 12 % V5 V5 Regulation Voltage 6V < VDRVCC < 10V 4.8 5.0 5.2 V V5 Load Regulation IV5 = 0mA to 20mA 0.5 1 % Current DACs (IDAC) VHIGH/VLOW IDAC Accuracy MFR_IDAC_VLOW/HIGH = 0x40 or 0x7F –1 1 % VHIGH/VLOW IDAC Program Range –64 63 µA SETCUR IDAC Program Range 0 31 µA LSB VHIGH/VLOW IDAC LSB SETCUR IDAC LSB 1 1 µA µA Oscillator and Phase-Locked Loop IFREQ FREQ Pin Output Current l 19 20 21 µA Nominal Frequency VSYNC = 0V, RFREQ = 51.1k 230 250 270 kHz fLOW Low Fixed Frequency VSYNC = 0V, RFREQ = 27.4k 55 70 85 kHz fHIGH High Fixed Frequency VSYNC = 0V, RFREQ = 105k 640 710 780 kHz |
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