Datasheet LT3090 (Analog Devices) - 4
| Manufacturer | Analog Devices |
| Description | –36V, 600mA Negative Linear Regulator with Programmable Current Limit |
| Pages / Page | 36 / 4 — e lecTrical characTerisTics The. denotes the specifications which apply … |
| File Format / Size | PDF / 704 Kb |
| Document Language | English |
e lecTrical characTerisTics The. denotes the specifications which apply over the full operating
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LT3090
e lecTrical characTerisTics The
l
denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. PARAMETER CONDITIONS MIN TYP MAX UNITS
Positive Current Monitor Positive Current Monitoring (IMONP) Scale Factor 0.5 mA/A (Note 15) IOUT = 600mA, VIN = –2.5V, VIMONN = 2V, VIMONP = 0V l 280 300 320 µA IOUT = 100mA, VIN = –2.5V, VIMONN = 2V, VIMONP = 0V l 42.5 50 57.5 µA Negative Current Monitor Negative Current Monitoring (IMONN) Scale Factor 1 mA/A IOUT = 600mA, VIN = –2.5V, VIMONN = 0V, VIMONP = –2.5V l 560 600 640 µA IOUT = 100mA, VIN = –2.5V, VIMONN = 0V, VIMONP = –2.5V l 85 100 115 µA Minimum Required Load –36V < VIN < –1.9V l 10 µA Current (Note 4) Thermal Regulation ISET 10ms Pulse 0.04 %/W
Note 1.
Stresses beyond those listed under Absolute Maximum Ratings
Note 6.
Load regulation is Kelvin sensed at the package. may cause permanent damage to the device. Exposure to any Absolute
Note 7.
Dropout voltage is the minimum output-to-input voltage Maximum Rating condition for extended periods may affect device differential needed to maintain regulation at a specified output current. In reliability and lifetime. dropout, the output voltage is: VIN + VDROPOUT.
Note 2.
The LT3090 is tested and specified under pulsed load conditions
Note 8.
GND pin current is tested with VIN = VOUT(NOMINAL) and a current such that TJ ≅ TA. The LT3090E is guaranteed to meet performance source load. Therefore, the device is tested while operating in dropout. specifications from 0°C to 125°C junction temperature. Specifications over This is the worst-case GND pin current. GND pin current decreases at the –40°C to 125°C operating temperature range are assured by design, higher input voltages. characterization, and correlation with statistical process controls. The
Note 9.
The SET pin is clamped to OUT with diodes through 12k resistors. LT3090I is guaranteed over the full –40°C to 125°C operating junction These resistors and diodes only carry current under transient overloads or temperature range. The LT3090MP is 100% tested and guaranteed fault conditions. over the full –55°C to 150°C operating junction temperature range. The LT3090H is 100% tested at the 150°C operating junction temperature.
Note 10.
Positive SHDN pin current flows into the SHDN pin. High junction temperatures degrade operating lifetimes. Operating lifetime
Note 11.
The SHDN threshold must be met to ensure device operation. is derated at junction temperatures greater than 125°C.
Note 12.
Output noise decreases by adding a capacitor across the voltage
Note 3.
Parasitic diodes exist internally between the OUT, SET, ILIM, setting resistor. Adding this capacitor bypasses the voltage setting SHDN, IMONP, IMONN, and GND pins and the IN pin. Do not drive OUT, resistor’s thermal noise as well as the reference current’s noise. Output SET, ILIM, SHDN, IMONP, IMONN, and GND pins more than 0.3V below noise then equals the error amplifier noise (see Applications Information the IN pin during fault conditions. These pins must remain at a voltage section). more positive than IN during normal operation.
Note 13.
The internal back-up current limit circuitry incorporates foldback
Note 4.
The LT3090 may go out of regulation if the minimum output protection that decreases current limit for VOUT – VIN ≥ 7V. Some level of current requirement is not satisfied. output current is provided at all VOUT – VIN differential voltages. Please
Note 5.
Maximum junction temperature limits operating conditions. The consult the Typical Performance Characteristic graph for current limit vs regulated output voltage specification does not apply for all possible VOUT – VIN. combinations of input voltage and output current, primarily due to the
Note 14.
The current limit programming scale factor is specified while internal current limit foldback which decreases current limit at V the internal backup current limit is not active. Please note that the internal OUT – VIN ≥ 7V. If operating at maximum output current, limit the input voltage current limit has foldback protection for VOUT-to-VIN differentials greater range. If operating at maximum input voltage, limit the output current than 7V. range.
Note 15.
For positive current monitoring, bias IMONN to ≥ 2V above IMONP. 3090fa 4 For more information www.linear.com/LT3090
e lecTrical characTerisTics The
l
denotes the specifications which apply over the full operating temperature range, otherwise specifications are at TA = 25°C. PARAMETER CONDITIONS MIN TYP MAX UNITS
Positive Current Monitor Positive Current Monitoring (IMONP) Scale Factor 0.5 mA/A (Note 15) IOUT = 600mA, VIN = –2.5V, VIMONN = 2V, VIMONP = 0V l 280 300 320 µA IOUT = 100mA, VIN = –2.5V, VIMONN = 2V, VIMONP = 0V l 42.5 50 57.5 µA Negative Current Monitor Negative Current Monitoring (IMONN) Scale Factor 1 mA/A IOUT = 600mA, VIN = –2.5V, VIMONN = 0V, VIMONP = –2.5V l 560 600 640 µA IOUT = 100mA, VIN = –2.5V, VIMONN = 0V, VIMONP = –2.5V l 85 100 115 µA Minimum Required Load –36V < VIN < –1.9V l 10 µA Current (Note 4) Thermal Regulation ISET 10ms Pulse 0.04 %/W
Note 1.
Stresses beyond those listed under Absolute Maximum Ratings
Note 6.
Load regulation is Kelvin sensed at the package. may cause permanent damage to the device. Exposure to any Absolute
Note 7.
Dropout voltage is the minimum output-to-input voltage Maximum Rating condition for extended periods may affect device differential needed to maintain regulation at a specified output current. In reliability and lifetime. dropout, the output voltage is: VIN + VDROPOUT.
Note 2.
The LT3090 is tested and specified under pulsed load conditions
Note 8.
GND pin current is tested with VIN = VOUT(NOMINAL) and a current such that TJ ≅ TA. The LT3090E is guaranteed to meet performance source load. Therefore, the device is tested while operating in dropout. specifications from 0°C to 125°C junction temperature. Specifications over This is the worst-case GND pin current. GND pin current decreases at the –40°C to 125°C operating temperature range are assured by design, higher input voltages. characterization, and correlation with statistical process controls. The
Note 9.
The SET pin is clamped to OUT with diodes through 12k resistors. LT3090I is guaranteed over the full –40°C to 125°C operating junction These resistors and diodes only carry current under transient overloads or temperature range. The LT3090MP is 100% tested and guaranteed fault conditions. over the full –55°C to 150°C operating junction temperature range. The LT3090H is 100% tested at the 150°C operating junction temperature.
Note 10.
Positive SHDN pin current flows into the SHDN pin. High junction temperatures degrade operating lifetimes. Operating lifetime
Note 11.
The SHDN threshold must be met to ensure device operation. is derated at junction temperatures greater than 125°C.
Note 12.
Output noise decreases by adding a capacitor across the voltage
Note 3.
Parasitic diodes exist internally between the OUT, SET, ILIM, setting resistor. Adding this capacitor bypasses the voltage setting SHDN, IMONP, IMONN, and GND pins and the IN pin. Do not drive OUT, resistor’s thermal noise as well as the reference current’s noise. Output SET, ILIM, SHDN, IMONP, IMONN, and GND pins more than 0.3V below noise then equals the error amplifier noise (see Applications Information the IN pin during fault conditions. These pins must remain at a voltage section). more positive than IN during normal operation.
Note 13.
The internal back-up current limit circuitry incorporates foldback
Note 4.
The LT3090 may go out of regulation if the minimum output protection that decreases current limit for VOUT – VIN ≥ 7V. Some level of current requirement is not satisfied. output current is provided at all VOUT – VIN differential voltages. Please
Note 5.
Maximum junction temperature limits operating conditions. The consult the Typical Performance Characteristic graph for current limit vs regulated output voltage specification does not apply for all possible VOUT – VIN. combinations of input voltage and output current, primarily due to the
Note 14.
The current limit programming scale factor is specified while internal current limit foldback which decreases current limit at V the internal backup current limit is not active. Please note that the internal OUT – VIN ≥ 7V. If operating at maximum output current, limit the input voltage current limit has foldback protection for VOUT-to-VIN differentials greater range. If operating at maximum input voltage, limit the output current than 7V. range.
Note 15.
For positive current monitoring, bias IMONN to ≥ 2V above IMONP. 3090fa 4 For more information www.linear.com/LT3090
