LP3986 datasheet(5/13 Pages) NSC

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Electrical Characteristics (Continued)

Unless otherwise specified: V

IN =VOUT(nom) + 0.5V, CIN = 1 µF, IOUT = 1mA, COUT = 1 µF, CBYPASS = 0.01µF. Typical values

and limits appearing in standard typeface are for T

J = 25˚C. Limits appearing in boldface type apply over the entire junction

temperature range for operation, −40˚C to +125˚C. (Note 7) (Note 8)

Symbol

Parameter

Conditions

Typ

Limit

Units

Min

Max

Output Noise Voltage

BW = 10 Hz to 100 kHz,

OUT = 1µF

µVrms

ρn(1/f)

Output Noise Density

f = 120 Hz,

OUT = 1µF

µV/

Maximum Input Current

at EN

EN = 0.4 and VIN =6V

±10

Maximum Low Level

Input Voltage at EN

IN = 2.5 to 6V

0.4

Minimum High Level

Input Voltage at EN

IN = 2.5 to 6V

1.4

Xtalk

Crosstalk Rejection

∆I

Load1 = 150 mA at 1KHz rate

∆I

Load2 =1mA

∆V

OUT2/

∆V

OUT1

−60

∆I

Load2 = 150 mA at 1KHz rate

∆I

Load1 =1mA

∆V

OUT2/

∆V

OUT1

−60

OUT

Capacitance

(Note 13)

122

µF

ESR

(Note 14)

500

Ω

Note 1: Absolute Maximum Ratings are limits beyond which damage to the device may occur. Operating Ratings are conditions under which operation of the device

is guaranteed. Operating Ratings do not imply guaranteed performance limits. For guaranteed performance limits and associated test conditions, see the Electrical

Characteristics tables.

Note 2: All voltages are with respect to the potential at the GND pin.

Note 3: Additional information on pad temperature can be found in National Semiconductor Application Note (AN-1112).

Note 4: The Absolute Maximum power dissipation depends on the ambient temperature and can be calculated using the formula:

D =(TJ -TA)/

JA,

Where TJ is the junction temperature, TA is the ambient temperature, and θJA is the junction-to-ambient thermal resistance. The 364mW rating appearing under

Absolute Maximum Ratings results from substituting the Absolute Maximum junction temperature, 150˚C, for TJ, 70˚C for TA, and 220˚C/W for θJA. More power can

be dissipated safely at ambient temperatures below 70˚C . Less power can be dissipated safely at ambient temperatures above 70˚C. The Absolute Maximum power

dissipation can be increased by 4.5mW for each degree below 70˚C, and it must be derated by 4.5mW for each degree above 70˚C.

Note 5: The human body model is 100pF discharged through a 1.5k

Ω resistor into each pin. The machine model is a 200pF capacitor discharged directly into each

pin.

Note 6: Like the Absolute Maximum power dissipation, the maximum power dissipation for operation depends on the ambient temperature. The 250mW rating

appearing under Operating Ratings results from substituting the maximum junction temperature for operation, 125˚C, for TJ, 70˚C for TA, and 220˚C/W for θJA into

(1) above. More power can be dissipated at ambient temperatures below 70˚C . Less power can be dissipated at ambient temperatures above 70˚C. The maximum

power dissipation for operation can be increased by 4.5mW for each degree below 70˚C, and it must be derated by 4.5mW for each degree above 70˚C.

Note 7: All limits are guaranteed. All electrical characteristics having room temperature limits are tested during production with TJ = 25˚C or correlated using

Statistical Quality Control (SQC) methods. All hot and cold limits are guaranteed by correlating the electrical characteristics to process and temperature variations

and applying statistical process control.

Note 8: The target output voltage, which is labeled VOUT(nom), is the desired voltage option.

Note 9: The output voltage changes slightly with line voltage. An increase in the line voltage results in a slight increase in the output voltage and vice versa.

Note 10: The output voltage changes slightly with load current. An increase in the load current results in a slight decrease in the output voltage and vice versa.

Note 11: Dropout voltage is the input-to-output voltage difference at which the output voltage is 100mV below its nominal value.

Note 12: Turn-on time is that between the enable input just exceeding VIH and the output voltage just reaching 95% of its nominal value.

Note 13: Range of capacitor values for which the device will remain stable. This electrical specification is guaranteed by design.

Note 14: Range of capacitor ESR values for which the device will remain stable. This electrical specification is guaranteed by design.

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