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LT3757 Datasheet(PDF) 4 Page - Linear Technology |
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LT3757 Datasheet(HTML) 4 Page - Linear Technology |
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4 / 24 page  LT3959 4 3959f PARAMETER CONDITIONS MIN TYP MAX UNITS 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, Not Switching l 4.6 4.75 4.9 V VIN LDO Regulation Voltage DRIVE = 0V, Not Switching 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 < 40V, DRIVE = 6V 0.03 0.07 %/V VIN LDO Line Regulation [ΔVINTVCC/(VINTVCC • ΔVIN)] DRIVE = 0V, 5V < VIN < 40V 0.03 0.07 %/V DRIVE LDO Dropout Voltage (VDRIVE – VINTVCC) DRIVE = 4V, IINTVCC = 20mA l 190 400 mV VIN LDO Dropout Voltage (VIN – VINTVCC)VIN = 3V, DRIVE = 0V, IINTVCC = 20mA l 190 400 mV INTVCC Undervoltage Lockout Threshold Falling l 1.85 2.0 2.15 V INTVCC Undervoltage Lockout Threshold Rising l 2.15 2.3 2.45 V INTVCC Current in Shutdown EN/UVLO = 0V 25 μA Logic EN/UVLO Threshold Voltage Falling l 1.17 1.22 1.27 V EN/UVLO Threshold Voltage Rising Hysteresis 20 mV EN/UVLO Input Low Voltage IVIN < 1μA 0.4 V EN/UVLO Pin Bias Current Low EN/UVLO = 1.15V 1.8 2.2 2.6 μA EN/UVLO Pin Bias Current High EN/UVLO = 1.30V 10 100 nA FBX Power Good Threshold Voltage FBX > 0V, PGOOD Falling FBX < 0V, PGOOD Falling VFBX(REG) – 0.08 VFBX(REG) + 0.04 V V FBX Overvoltage Threshold FBX > 0V, PGOOD Rising FBX < 0V, PGOOD Rising VFBX(REG) + 0.12 VFBX(REG) – 0.06 V V PGOOD Output Low (VOL)IPGOOD = 250μA 210 300 mV PGOOD Leakage Current PGOOD = 40V 1 μA INTVCC Minimum Voltage to Enable PGOOD Function l 2.5 2.7 2.9 V INTVCC Minimum Voltage to Enable SYNC Function l 2.5 2.7 2.9 V ELECTRICAL CHARACTERISTICS 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. Note 1: Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. Exposure to any Absolute Maximum Rating condition for extended periods may affect device reliability and lifetime. Note 2: For VIN below 4V, the EN/UVLO pin must not exceed VIN for proper operation. Note 3: The LT3959E is guaranteed to meet performance specifications from the 0°C to 125°C operating junction temperature. Specifications over the –40°C to 125°C operating junction temperature range are assured by design, characterization and correlation with statistical process controls. The LT3959I is guaranteed over the full –40°C to 125°C operating junction temperature range. Note 4: The LT3959 is tested in a feedback loop which servos VFBX to the reference voltages (1.6V and –0.8V) with the VC pin forced to 1.3V. |
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