Datasheet LT1175 (Analog Devices) - 5
| Fabricante | Analog Devices |
| Descripción | 500mA Negative Low Dropout Micropower Regulator |
| Páginas / Página | 20 / 5 — ELECTRICAL CHARACTERISTICS. The. denotes specifi cations which apply over … |
| Formato / tamaño de archivo | PDF / 221 Kb |
| Idioma del documento | Inglés |
ELECTRICAL CHARACTERISTICS. The. denotes specifi cations which apply over the full operating
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Versión de texto del documento
LT1175
ELECTRICAL CHARACTERISTICS The
l
denotes specifi cations which apply over the full operating temperature range, otherwise specifi cations are at TA = 25°C. VOUT = 5V, VIN = 7V, IOUT = 0, VSHDN = 3V, ILIM2 and ILIM4 tied to VIN. 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. PARAMETER CONDITIONS MIN TYP MAX UNITS
Current Limit (Note 12) VIN – VOUT = 1V to 12V l 520 800 1300 mA ILIM2 Open l 390 600 975 mA ILIM4 Open l 260 400 650 mA ILIM2, ILIM4 Open l 130 200 325 mA Line Regulation (Note 11) VIN – VOUT = 1V to VIN = 20V l 0.003 0.015 %/V Load Regulation (Note 6, 11) IOUT = 0mA to 500mA l 0.1 0.35 % Thermal Regulation P = 0 to PMAX (Notes 4, 9) 5-Pin Packages 0.04 0.1 %/W 8-Pin Packages 0.1 0.2 %/W Output Voltage Temperature Drift TJ = 25°C to TJMIN, or 25°C to TJMAX 0.25 1.25 %
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings
Note 7:
This is the current required to pull the output voltage to within 1V may cause permanent damage to the device. Exposure to any Absolute of ground during shutdown. Maximum Rating condition for extended periods may affect device
Note 8:
Dropout voltage is measured by setting the input voltage equal to reliability and lifetime. the normal regulated output voltage and measuring the difference between
Note 2:
The LT1175 regulators are tested and specifi ed under pulse load VIN and VOUT. For currents between 100mA and 500mA, with both ILIM conditions such that TJ TA. The LT1175C is 100% production tested pins tied to VIN, maximum dropout can be calculated from at TA = 25°C. Performance at 0°C and 125°C is assured by design, VDO = 0.15 + 1.1Ω (IOUT). characterization and correlation with statistical process controls. The
Note 9:
Thermal regulation is a change in the output voltage caused by LT1175I is guaranteed over the full –40°C to 125°C operating junction die temperature gradients, so it is proportional to chip power dissipation. temperature range. The LT1175MP is 100% tested and guaranteed over Temperature gradients reach fi nal value in less than 100ms. Output voltage the –55°C to 125°C operating junction temperature range. changes after 100ms are due to absolute die temperature changes and
Note 3:
SHDN pin maximum positive voltage is 30V with respect to reference voltage temperature coeffi cient. – VIN and 13.5V with respect to GND. Maximum negative voltage is –20V
Note 10:
The lower limit of 0.8V is guaranteed to keep the regulator in with respect to GND and –5V with respect to –VIN. shutdown. The upper limit of 2.5V is guaranteed to keep the regulator
Note 4:
PMAX = 1.5W for 8-pin packages, and 6W for 5-pin packages. active. Either polarity may be used, referenced to GND pin. This power level holds only for input-to-output voltages up to 12V, beyond
Note 11:
Load and line regulation are measured on a pulse basis with which internal power limiting may reduce power. See Guaranteed Current pulse width of 20ms or less to keep chip temperature constant. DC Limit curve in Typical Performance Characteristics section. Note that all regulation will be affected by thermal regulation (Note 8) and chip conditions must be met. temperature changes. Load regulation specifi cation also holds for currents
Note 5:
GND pin current increases because of power transistor base up to the specifi ed current limit when ILIM2 or ILIM4 are left open. drive. At low input-to-output voltages (<1V) where the power transistor
Note 12:
Current limit is reduced for input-to-output voltage above 12V. is in saturation, GND pin current will be slightly higher. See Typical See the graph in Typical Performance Characteristics for guaranteed limits Performance Characteristics. above 12V.
Note 6:
With ILOAD = 0, at TJ > 125°C, power transistor leakage could
Note 13:
Operating at very large input-to-output differential voltages increase higher than the 10μA to 25μA drawn by the output divider or fi xed (>15V) with load currents less than 5mA requires an output capacitor with voltage SENSE pin, causing the output to rise above the regulated value. an ESR greater than 1Ω to prevent low level output oscillations. To prevent this condition, an internal active pull-up will automatically turn on, but supply current will increase. 1175ff 5
ELECTRICAL CHARACTERISTICS The
l
denotes specifi cations which apply over the full operating temperature range, otherwise specifi cations are at TA = 25°C. VOUT = 5V, VIN = 7V, IOUT = 0, VSHDN = 3V, ILIM2 and ILIM4 tied to VIN. 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. PARAMETER CONDITIONS MIN TYP MAX UNITS
Current Limit (Note 12) VIN – VOUT = 1V to 12V l 520 800 1300 mA ILIM2 Open l 390 600 975 mA ILIM4 Open l 260 400 650 mA ILIM2, ILIM4 Open l 130 200 325 mA Line Regulation (Note 11) VIN – VOUT = 1V to VIN = 20V l 0.003 0.015 %/V Load Regulation (Note 6, 11) IOUT = 0mA to 500mA l 0.1 0.35 % Thermal Regulation P = 0 to PMAX (Notes 4, 9) 5-Pin Packages 0.04 0.1 %/W 8-Pin Packages 0.1 0.2 %/W Output Voltage Temperature Drift TJ = 25°C to TJMIN, or 25°C to TJMAX 0.25 1.25 %
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings
Note 7:
This is the current required to pull the output voltage to within 1V may cause permanent damage to the device. Exposure to any Absolute of ground during shutdown. Maximum Rating condition for extended periods may affect device
Note 8:
Dropout voltage is measured by setting the input voltage equal to reliability and lifetime. the normal regulated output voltage and measuring the difference between
Note 2:
The LT1175 regulators are tested and specifi ed under pulse load VIN and VOUT. For currents between 100mA and 500mA, with both ILIM conditions such that TJ TA. The LT1175C is 100% production tested pins tied to VIN, maximum dropout can be calculated from at TA = 25°C. Performance at 0°C and 125°C is assured by design, VDO = 0.15 + 1.1Ω (IOUT). characterization and correlation with statistical process controls. The
Note 9:
Thermal regulation is a change in the output voltage caused by LT1175I is guaranteed over the full –40°C to 125°C operating junction die temperature gradients, so it is proportional to chip power dissipation. temperature range. The LT1175MP is 100% tested and guaranteed over Temperature gradients reach fi nal value in less than 100ms. Output voltage the –55°C to 125°C operating junction temperature range. changes after 100ms are due to absolute die temperature changes and
Note 3:
SHDN pin maximum positive voltage is 30V with respect to reference voltage temperature coeffi cient. – VIN and 13.5V with respect to GND. Maximum negative voltage is –20V
Note 10:
The lower limit of 0.8V is guaranteed to keep the regulator in with respect to GND and –5V with respect to –VIN. shutdown. The upper limit of 2.5V is guaranteed to keep the regulator
Note 4:
PMAX = 1.5W for 8-pin packages, and 6W for 5-pin packages. active. Either polarity may be used, referenced to GND pin. This power level holds only for input-to-output voltages up to 12V, beyond
Note 11:
Load and line regulation are measured on a pulse basis with which internal power limiting may reduce power. See Guaranteed Current pulse width of 20ms or less to keep chip temperature constant. DC Limit curve in Typical Performance Characteristics section. Note that all regulation will be affected by thermal regulation (Note 8) and chip conditions must be met. temperature changes. Load regulation specifi cation also holds for currents
Note 5:
GND pin current increases because of power transistor base up to the specifi ed current limit when ILIM2 or ILIM4 are left open. drive. At low input-to-output voltages (<1V) where the power transistor
Note 12:
Current limit is reduced for input-to-output voltage above 12V. is in saturation, GND pin current will be slightly higher. See Typical See the graph in Typical Performance Characteristics for guaranteed limits Performance Characteristics. above 12V.
Note 6:
With ILOAD = 0, at TJ > 125°C, power transistor leakage could
Note 13:
Operating at very large input-to-output differential voltages increase higher than the 10μA to 25μA drawn by the output divider or fi xed (>15V) with load currents less than 5mA requires an output capacitor with voltage SENSE pin, causing the output to rise above the regulated value. an ESR greater than 1Ω to prevent low level output oscillations. To prevent this condition, an internal active pull-up will automatically turn on, but supply current will increase. 1175ff 5