LT3050 datasheet(4/20 Pages) LINER

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LT3050

3050f

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. Absolute maximum input-to-output differential

voltage is not achievable with all combinations of rated IN pin and OUT pin

voltages. With the IN pin at 50V, the OUT pin may not be pulled below 0V.

The total differential voltage from IN to OUT must not exceed ±50V.

Note 2: The LT3050 is tested and speciﬁed under pulse load conditions

such that TJ ~ TA. The LT3050E is 100% production tested at TA = 25°C.

Performance at –40°C and 125°C is assured by design, characterization

and correlation with statistical process controls. The LT3050I is

guaranteed over the full –40°C to 125°C operating junction temperature

range. The LT3050MP is 100% tested over the –55°C to 125°C operating

junction temperature range.

Note 3: The LT3050 is tested and speciﬁed for these conditions with ADJ

pin connected to the OUT pin.

Note 4: Maximum junction temperature limits operating conditions.

Regulated output voltage speciﬁcations do not apply for all possible

combinations of input voltage and output current. If operating at the

maximum input voltage, limit the output current range. If operating at the

maximum output current, limit the input voltage range.

Note 5: Dropout voltage is the minimum differential IN-to-OUT voltage

needed to maintain regulation at a speciﬁed output current. In dropout,

the output voltage equals (VIN - VDROPOUT). For some output voltages,

minimum input voltage requirements limit dropout voltage.

Note 6: To satisfy minimum input voltage requirements, the LT3050 is

tested and speciﬁed for these conditions with an 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 external current is not

factored into GND pin current.

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

Minimum IMIN Threshold Accuracy (Note 9)

5.6V < VIN < 15V, VOUT = 5V, RIMIN = 110K

0.9

1.1

IMIN Threshold Accuracy (Note 9)

5.6V < VIN < 15V, VOUT = 5V, RIMIN = 11.3K

910

Current Monitor Ratio (Note10)

Ratio = IOUT/IMON

VIMON = VOUT = 5V, 5.6V < VIN < 15V

ILOAD = 5mA, 25mA, 50mA, 75mA, 100mA

100

105

Note 7: GND pin current is tested with VIN = VOUT(NOMINAL) + 0.5V and a

current source load. GND pin current increases in dropout. See GND pin

current curves in the Typical Performance Characteristics section.

Note 8: Current limit varies inversely with the external resistor value tied

from the IMAX pin to GND. For detailed information on how to set the

IMAX pin resistor value, please see the Operation section. If a programmed

current limit is not needed, the IMAX pin must be tied to GND and internal

protection circuitry implements short-circuit protection as speciﬁed.

Note 9: The IMIN fault condition asserts if the output current falls below the

IMIN threshold deﬁned by an external resistor from the IMIN pin to GND.

For detailed information on how to set the IMIN pin resistor value, please

see the Operation section. IMIN settings below the Minimum IMIN Accuracy

speciﬁcation in the Electrical Characteristics section are not guaranteed

to ± 10% tolerance. If the IMIN fault condition is not needed, the IMIN pin

must be left ﬂoating (unconnected).

Note 10: The current monitor ratio varies slightly when VIMON ≠ VOUT. For

detailed information on how to calculate the output current from the IMON

pin, please see the Operation section. If the current monitor function is not

needed, the IMON pin must be tied to GND.

Note 11: To satisfy requirements for minimum input voltage, current limit

is tested at VIN = VOUT(NOMINAL) +1V or VIN = 2.2V, whichever is greater.

Note 12: ADJ pin bias current ﬂows out of the ADJ pin:

Note 13:

SHDN pin current ﬂows into the SHDN pin.

Note 14: Reverse output current is tested with the IN pin grounded and the

OUT pin forced to the speciﬁed voltage. This current ﬂows into the OUT pin

and out of the GND pin.

Note 15: 100mA of output current does not apply to the full range of input

voltage due to the internal current limit foldback.

ELECTRICAL CHARACTERISTICS The l denotes the speciﬁcations which apply over the full operating

temperature range, otherwise speciﬁcations are at TA = 25°C. (Note 2)

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