Datasheet LT3050 (Analog Devices) - 5

LT3050 Series
ELECTRICAL CHARACTERISTICS The
l
denotes the specifi cations which apply over the full operating temperature range, otherwise specifi cations are at TA = 25°C. (Note 2) PARAMETER CONDITIONS MIN TYP MAX UNITS
Minimum IMIN Threshold Accuracy LT3050-3.3: 3.9V < VIN < 13.3V, RIMIN = 110K l 0.92 1.03 1.13 mA (Notes 6, 9) LT3050, LT3050-5: 5.6V < VIN < 15V, RIMIN = 110K l 0.9 1 1.1 mA IMIN Threshold Accuracy (Notes 6, 9) LT3050-3.3: 3.9V < VIN < 13.3V, RIMIN = 11.3K l 9.2 10.3 11.3 mA LT3050, LT3050-5: 5.6V < VIN < 15V, RIMIN = 11.3K l 9 10 11 mA Current Monitor Ratio (Notes 6, 10) ILOAD = 5mA, 25mA, 50mA, 75mA, 100mA Ratio = IOUT/IMON LT3050-3.3: V l IMON = VOUT, 3.9V < VIN < 13.3V 95 100 105 LT3050, LT3050-5: V l 95 100 105 IMON = VOUT, 5.6V < VIN < 15V
Note 1:
Stresses beyond those listed under Absolute Maximum Ratings 10μA to GND pin current. See the GND Pin Current curves in the Typical may cause permanent damage to the device. Exposure to any Absolute Performance Characteristics section. Maximum Rating condition for extended periods may affect device
Note 8:
Current limit varies inversely with the external resistor value tied reliability and lifetime. Absolute maximum input-to-output differential from the IMAX pin to GND. For detailed information on how to set the voltage is not achievable with all combinations of rated IN pin and OUT pin IMAX pin resistor value, please see the Operation section. If a programmed voltages. With the IN pin at 50V, the OUT pin may not be pulled below 0V. current limit is not needed, the IMAX pin must be tied to GND and internal The total differential voltage from IN to OUT must not exceed ±50V. protection circuitry implements short-circuit protection as specifi ed.
Note 2:
The LT3050 is tested and specifi ed under pulse load conditions
Note 9:
The IMIN fault condition asserts if the output current falls below the such that TJ ~ TA. The LT3050E is 100% production tested at TA = 25°C. IMIN threshold defi ned by an external resistor from the IMIN pin to GND. Performance at –40°C and 125°C is assured by design, characterization For detailed information on how to set the IMIN pin resistor value, please and correlation with statistical process controls. The LT3050I is see the Operation section. IMIN settings below the Minimum IMIN Accuracy guaranteed over the full –40°C to 125°C operating junction temperature specifi cation in the Electrical Characteristics section are not guaranteed range. The LT3050MP is 100% tested over the –55°C to 125°C operating to ± 10% tolerance. If the IMIN fault condition is not needed, the IMIN pin junction temperature range. must be left fl oating (unconnected).
Note 3:
The LT3050 adjustable version is tested and specifi ed for these
Note 10:
The current monitor ratio varies slightly when VIMON ≠ VOUT. For conditions with ADJ pin connected to the OUT pin. detailed information on how to calculate the output current from the IMON
Note 4:
Maximum junction temperature limits operating conditions. pin, please see the Operation section. If the current monitor function is not Regulated output voltage specifi cations do not apply for all possible needed, the IMON pin must be tied to GND. combinations of input voltage and output current. If operating at the
Note 11:
To satisfy requirements for minimum input voltage, current limit maximum input voltage, limit the output current range. If operating at the is tested at VIN = VOUT(NOMINAL) +1V or VIN = 2.2V, whichever is greater. maximum output current, limit the input voltage range.
Note 12:
ADJ pin bias current fl ows out of the ADJ pin:
Note 5:
Dropout voltage is the minimum differential IN-to-OUT voltage
Note 13:
SHDN pin current fl ows into the SHDN pin. needed to maintain regulation at a specifi ed output current. In dropout,
Note 14:
Reverse output current is tested with the IN pin grounded and the the output voltage equals (VIN - VDROPOUT). For some output voltages, OUT pin forced to the specifi ed voltage. This current fl ows into the OUT pin minimum input voltage requirements limit dropout voltage. and out of the GND pin.
Note 6:
To satisfy minimum input voltage requirements, the LT3050
Note 15:
100mA of output current does not apply to the full range of input adjustable version is tested and specifi ed for these conditions with an voltage due to the internal current limit foldback. external resistor divider (60k bottom, 440k top) which sets VOUT to 5V. The external resistor divider adds 10μA of DC load on the output. This
Note 16:
The ADJ pin cannot be externally driven for fi xed output voltage external current is not factored into GND pin current. options. LTC allows the use of a small feedforward capacitor from OUT to ADJ to reduce noise and improve transient response. See the Bypass
Note 7:
GND pin current is tested with VIN = VOUT(NOMINAL) + 0.6V and Capacitance section of the Applications Information. a current source load. GND pin current increases in dropout. For the fi xed output voltage versions, an internal resistor divider adds about 3050fa 5 Document Outline FEATURES DESCRIPTION APPLICATIONS TYPICAL APPLICATION ABSOLUTE MAXIMUM RATINGS PIN CONFIGURATION ORDER INFORMATION ELECTRICAL CHARACTERISTICS TYPICAL PERFORMANCE CHARACTERISTICS PIN FUNCTIONS BLOCK DIAGRAM OPERATION APPLICATIONS INFORMATION PACKAGE DESCRIPTION REVISION HISTORY TYPICAL APPLICATION RELATED PARTS