LP3984 datasheet(5/11 Pages) NSC

5 / 11 page

Electrical Characteristics (Continued)

Unless otherwise specified: V

IN = 2.5V for 1.5, 1.8, & 2.0V options, VIN =VOUT + 0.5 for output options higher than 2.5V, CIN =

1 µF, I

OUT = 1mA, COUT = 1 µF, tantalum. Typical values and limits appearing in standard typeface are for TJ = 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

Maximum Low Level Input

Voltage at EN

IN = 2.5 to 6.0V

0.4

Minimum High Level Input

Voltage at EN

IN = 2.5 to 6.0V

1.4

OUT

Output Capacitor

Capacitance

µF

ESR

Ω

TSD

Thermal Shutdown Temperature

160

˚C

Thermal Shutdown Hysteresis

˚C

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 lead temperature and pad temperature can be found in National Semiconductor Application Note (AN-1112).

Note 4: The

Absolute

Maximum

power

dissipation

depends

the

ambient

temperature

and

can

calculated

using

the

formula:

PD =(TJ -TA)/θJA,

where TJ is the junction temperature, TA is the ambient temperature, and θ JA is the junction-to-ambient thermal resistance. The 364mW rating for SOT23-5

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 for SOT23-5 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 1.5k

Ω resistor into each pin. The machine model is a 200 pF 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 for

SOT23-5 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 (Note 4) 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: An increase in the load current results in a slight decrease in the output voltage and vice versa.

Note 10: Dropout voltage is the input-to-output voltage difference at which the output voltage is 100mV below its nominal value. This specification does not apply

for input voltages below 2.5V.

Note 11: Turn-on time is time measured between the enable input just exceeding VIH and the output voltage just reaching 95% of its nominal value.

20020408

FIGURE 1. Output AC Line Regulation Input Perturbation

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