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LT3957 Datasheet(PDF) 3 Page - Linear Technology |
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LT3957 Datasheet(HTML) 3 Page - Linear Technology |
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3 / 32 page  LT3759 3 3759fb ELECTRICAL CHARACTERISTICS PARAMETER CONDITIONS MIN TYP MAX UNITS VIN Operating Voltage l 1.6 42 V VIN Shutdown IQ EN/UVLO < 0.4V EN/UVLO = 1.15V 0.1 1 6 μA μA VIN Operating IQ 350 450 μA DRIVE Shutdown Quiescent Current EN/UVLO < 0.4V EN/UVLO = 1.15V 0.1 0.1 1 2 μA μA DRIVE Quiescent Current (Not Switching) RT = 27.4kΩ, DRIVE = 6V 2.0 2.5 mA SENSE Current Limit Threshold l 46 50 54 mV SENSE Input Bias Current Current Out of Pin –55 μA Error Amplifier FBX Regulation Voltage (VFBX(REG)) FBX > 0V FBX < 0V l l 1.580 –0.815 1.6 –0.80 1.620 –0.785 V V FBX Pin Input Current FBX = 1.6V FBX = –0.8V –10 60 120 10 nA nA Transconductance gm (ΔI2/ΔVFBX) FBX = VFBX(REG) 240 μs VC Output Impedance 5MΩ FBX Line Regulation [ΔVFBX(REG)/(ΔVIN • VFBX(REG))] 1.6V < VIN < 42V, FBX >0 1.6V < VIN < 42V, FBX <0 0.02 0.02 0.05 0.05 %/V %/V VC Current Mode Gain (ΔVVC/ΔVSENSE) 5V/V VC Source Current FBX = 0V, VC = 1.3V –13 μA VC Sink Current FBX = 1.7V, VC = 1.3V FBX = –0.85V, VC = 1.3V 13 10 μA μA Oscillator Switching Frequency RT = 27.4k to GND, VFBX = 1.6V RT = 86.6k to GND, VFBX = 1.6V RT = 6.81k to GND, VFBX = 1.6V 270 300 100 1000 330 kHz kHz kHz RT Voltage FBX = 1.6V, –0.8V 1.2 V GATE Minimum Off-Time 170 200 ns GATE Minimum On-Time 170 200 ns SYNC Input Low l 0.4 V SYNC Input High l 1.5 V SS Pull-Up Current SS = 0V, Current Out of Pin l –14 –10.5 –7 μA Low Dropout Regulators (DRIVE LDO and VIN LDO) DRIVE LDO Regulation Voltage DRIVE = 6V l 4.6 4.75 4.9 V VIN LDO Regulation Voltage DRIVE = 0V l 3.6 3.75 3.9 V DRIVE LDO Current Limit INTVCC = 4V 60 mA VIN LDO Current Limit DRIVE = 0V, INTVCC = 3V 60 mA DRIVE LDO Load Regulation (ΔVINTVCC/VINTVCC) 0 < IINTVCC < 20mA, DRIVE = 6V –1 –0.6 % VIN LDO Load Regulation (ΔVINTVCC/VINTVCC) DRIVE = 0V, 0 < IINTVCC < 20mA –1 –0.6 % DRIVE LDO Line Regulation [ΔVINTVCC/(VINTVCC • ΔVIN)] 1.6V < VIN < 42V, DRIVE = 6V 0.03 0.07 %/V VIN LDO Line Regulation [ΔVINTVCC/(VINTVCC • ΔVIN)] DRIVE = 0V, 5V < VIN < 42V 0.03 0.07 %/V DRIVE LDO Dropout Voltage (VDRIVE – VINTVcc) DRIVE = 4V, IINTVCC = 20mA l 190 400 mV The l denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C, VIN = 12V, EN/UVLO = 12V, INTVCC = 4.75V, unless otherwise noted. |
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Similar Description - LT3957 |
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