LP2980-ADJ
Electrical Characteristics
Note 2:
The ESD rating of pins 3 and 4 is 1 kV.
(Continued)
Note 1:
Absolute maximum ratings indicate limits beyond which damage to the component may occur. Electrical specifications do not apply when operating the de-
vice outside of its rated operating conditions.
Note 3:
The maximum allowable power dissipation is a function of the maximum junction temperature, T
J
(MAX), the junction-to-ambient thermal resistance,
θ
J-A
, and
the ambient temperature, T
A
. The maximum allowable power dissipation at any ambient temperature is calculated using:
The value of
θ
J-A
for the SOT-23 package is 300˚C/W. Exceeding the maximum allowable power dissipation will cause excessive die temperature, and the regulator
will go into thermal shutdown.
Note 4:
If used in a dual-supply system where the regulator load is returned to a negative supply, the LP2980-ADJ output must be diode-clamped to ground.
Note 5:
The output PNP structure contains a diode between the V
IN
and V
OUT
terminals that is normally reverse-biased. Reversing the polarity from V
IN
to V
OUT
will turn on this diode (see Application Hints).
Note 6:
Limits are 100% production tested at 25˚C. Limits over the operating temperature range are guaranteed through correlation using Statistical Quality Control
(SQC) methods. The limits are used to calculate National’s Average Outgoing Quality Level (AOQL).
Note 7:
Dropout voltage is defined as the input to output differential at which the output voltage drops 100 mV below the value measured with a 1V differential.
Note 8:
The ON/OFF input must be properly driven to prevent possible misoperation. For details, refer to Application Hints.
Note 9:
See Typical Performance Characteristics curves.
Typical Performance Characteristics
I
L
= 1 mA, ON/OFF pin tied to V
IN
, R
ADJ
Output Voltage vs. Temperature
Unless otherwise specified: T
A
= 25˚C, V
IN
= V
O
(NOM) + 1V,
= 86.6k, and test circuit is as shown in Basic Application Circuit.
Dropout Characteristics
DS100001-5
DS100001-6
Dropout Voltage vs. Temperature
Dropout Voltage vs. Load Current
DS100001-7
DS100001-8
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