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LT1175IS8-TR Datasheet(PDF) 4 Page - Linear Technology |
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LT1175IS8-TR Datasheet(HTML) 4 Page - Linear Technology |
4 / 18 page LT1175 1175fe elecTrical characTerisTics 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: SHDN pin maximum positive voltage is 30V with respect to –VIN and 13.5V with respect to GND. Maximum negative voltage is –20V with respect to GND and –5V with respect to –VIN. Note 3: PMAX = 1.5W for 8-pin packages, and 6W for 5-pin packages. This power level holds only for input-to-output voltages up to 12V, beyond which internal power limiting may reduce power. See Guaranteed Current Limit curve in Typical Performance Characteristics section. Note that all conditions must be met. Note 4: GND pin current increases because of power transistor base drive. At low input-to-output voltages (<1V) where the power transistor The l denotes specifications which apply over the operating temperature range, otherwise specifications are at TA = 25°C. VOUT = 5V, VIN = 7V, IOUT = 0, VSHDN = 3V, ILIM2 and ILIM4 tied to VIN, TJ = 25°C, unless otherwise noted. To avoid confusion with “min” and “max” as applied to negative voltages, all voltages are shown as absolute values except where polarity is not obvious. is in saturation, GND pin current will be slightly higher. See Typical Performance Characteristics. Note 5: With ILOAD = 0, at TJ > 125°C, power transistor leakage could increase higher than the 10µA to 25µA drawn by the output divider or fixed voltage SENSE pin, causing the output to rise above the regulated value. To prevent this condition, an internal active pull-up will automatically turn on, but supply current will increase. Note 6: This is the current required to pull the output voltage to within 1V of ground during shutdown. Note 7: Dropout voltage is measured by setting the input voltage equal to the normal regulated output voltage and measuring the difference between VIN and VOUT. For currents between 100mA and 500mA, with both ILIM pins tied to VIN, maximum dropout can be calculated from VDO = 0.15 + 1.1Ω (IOUT). PARAMETER CONDITIONS MIN TYP MAX UNITS Feedback Sense Voltage Adjustable Part Fixed 5V Part 3.743 4.93 3.8 5.0 3.857 5.075 V V Output Voltage Initial Accuracy Adjustable, Measured at 3.8V Sense Fixed 5V 0.5 0.5 1.5 1.5 % % Output Voltage Accuracy (All Conditions) VIN – VOUT = 1V to VIN = 20V, IOUT = 0A to 500mA P = 0 to PMAX, TJ = TMIN to TMAX (Note 3) l 1.5 2.5 % Quiescent Input Supply Current VIN – VOUT ≤ 12V l 45 65 80 µA µA GND Pin Current Increase with Load (Note 4) l 10 20 µA/mA Input Supply Current in Shutdown VSHDN = 0V l 10 20 25 µA µA Shutdown Thresholds (Note 9) Either Polarity On SHDN Pin l 0.8 2.5 V SHDN Pin Current (Note 2) VSHDN = 0V to 10V (Flows Into Pin) VSHDN = –15V to 0V (Flows Into Pin) l 4 1 8 4 µA µA Output Bleed Current in Shutdown (Note 6) VOUT = 0V, VIN = 15V l 0.1 1 1 5 µA µA SENSE Pin Input Current (Adjustable Part Only, Current Flows Out of Pin) (Fixed Voltage Only, Current Flows Out of Pin) l l 75 12 150 20 nA µA Dropout Voltage (Note 7) IOUT = 25mA IOUT = 100mA IOUT = 500mA ILIM2 Open, IOUT = 300mA ILIM4 Open, IOUT = 200mA ILIM2, ILIM4 Open, IOUT = 100mA l l l l l l 0.1 0.18 0.5 0.33 0.3 0.26 0.2 0.26 0.7 0.5 0.45 0.45 V V V V V V Current Limit (Note 11) VIN – VOUT = 1V to 12V ILIM2 Open ILIM4 Open ILIM2, ILIM4 Open l l l l 520 390 260 130 800 600 400 200 1300 975 650 325 mA mA mA mA Line Regulation (Note 10) VIN – VOUT = 1V to VIN = 20V l 0.003 0.015 %/V Load Regulation (Note 5, 10) IOUT = 0mA to 500mA l 0.1 0.35 % Thermal Regulation P = 0 to PMAX (Notes 3, 8) 5-Pin Packages 8-Pin Packages 0.04 0.1 0.1 0.2 %/W %/W Output Voltage Temperature Drift TJ = 25°C to TJMIN, or 25°C to TJMAX 0.25 1.25 % |
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