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LT1681 Datasheet(PDF) 3 Page - Linear Technology |
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LT1681 Datasheet(HTML) 3 Page - Linear Technology |
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3 / 20 page  3 LT1681 1681f The q denotes specifications which apply over the full operating temperature range, otherwise specifications are TA = 25°C. VCC = VBST = 12V, VBSTREF = 0V, VVC = 2V, VFB = VREF = 1.25V, CTG = CBG = CSG = 1000pF. ELECTRICAL CHARACTERISTICS SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS 5V External Reference V5VREF 5V Reference Voltage 0 ≤ (I5VREF – IVC) < 20mA 4.85 5 5.10 V q 4.80 5.15 V I5VREFSC Short-Circuit Current Source, IVC = 0 q 20 45 mA R5VREF Output Impedance 0 ≤ (I5VREF – IVC) < 20mA 1 Ω Error Amp VFB Error Amplifier Reference Voltage Measured at Feedback Pin 1.242 1.250 1.258 V q 1.225 1.265 V IFB Feedback Input Current VFB = VREF –50 nA AV Error Amplifier Voltage Gain 72 dB IVC Error Amplifier Current Limit Source q 10 25 mA Sink q 0.5 1 mA VVC Zero Current Output Voltage 1.4 V Maximum Output Voltage 3.2 V GBW Gain Bandwidth Product (Note 3) 1 MHz Current Sense and Blanking AV Amplifier DC Gain 12 V/V ISENSE Input Bias Current – 275 µA VSENSE Current Limit Threshold Measured at SENSE Pin 135 150 165 mV q 130 170 mV tD Current Sense to Switch Delay 175 ns VBLKSENS Blanking Input Threshold q 4.5 5 5.5 V IBLKSENS Blanking Input Bias Current –2 µA tMIN Switch Minimum On Time VBLKSENS = VBG, Measured at BG Output 250 ns IMAX Sense IIMAX Input Bias Current – 250 µA VIMAX IMAX Threshold (Rising Edge) Measured at IMAX Input q 320 360 400 mV IMAX Threshold Hysteresis Measured at IMAX Input 140 mV tP IMAX Output Switch Disable Delay Measured at BG Output 130 ns THERM and OVLO Fault Detectors VTHERM/ Threshold (Rising Edge) q 1.2 1.25 1.3 V VOVLO Threshold Hysteresis q 20 40 60 mV tP Fault Delay to Output Disable 50mV Overdrive 650 ns Oscillator and Synchronization Decoder fOSC Oscillator Frequency, Free Run Measured at FSET Pin 700 kHz Frequency Programming Error, Free Run fOSC ≤ 500kHz (Note 3) q –10 5 % IFSET FSET Input Bias Current FSET Charging, VFSET = 2V 50 nA VSYNC SYNC Logic High Input Threshold Positive-Going Edge q 1.4 2 V SYNC Logic Low Input Threshold Negative-Going Edge q 0.8 1.4 V fSYNC SYNC Frequency q fOSC/2 350 kHz tH, L Maximum SYNC Pulse Width fOSC = Oscillator Free-Run Frequency 1/fOSC s (Logic High or Logic Low) |
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