LP2954AISX National Semiconductor, LP2954AISX Datasheet - Page 5

• Manufacturer Part Number: LP2954AISX
• Description: 5V and Adjustable Micropower Low-Dropout Voltage Regulators
• Manufacturer: National Semiconductor

Electrical Characteristics
Note 3: Output voltage temperature coefficient is defined as the worst case voltage change divided by the total temperature range.
Note 4: Regulation is measured at constant junction temperature using low duty cycle pulse testing. Parts are tested separately for load regulation in the load
ranges 0.1 mA–1 mA and 1 mA–250 mA. Changes in output voltage due to heating effects are covered by the thermal regulation specification.
Note 5: 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 6: Ground pin current is the regulator quiescent current. The total current drawn from the source is the sum of the load current plus the ground pin current.
Note 7: Thermal regulation is defined as the change in output voltage at a time T after a change in power dissipation is applied, excluding load or line regulation
effects. Specifications are for 200 mA load pulse at V
Note 8: When used in dual-supply systems where the regulator load is returned to a negative supply, the output voltage must be diode-clamped to ground.
Note 9: Connect a 0.1µF capacitor from the output to the feedback pin.
Note 10: V
Note 11: Two seperate tests are performed, one covering V
Note 12: V
Note 13: Comparator thresholds are expressed in terms of a voltage differential at the Feedback terminal below the nominal reference voltage measured at
V
Note 14: Human body model, 200pF discharged through 1.5k .
Typical Performance Characteristics
Quiescent Current
Ground Pin Current
IN
Thermal Resistance (˚C/W) (Data from AAVID Eng.)
= V
O
TABLE 1. Typical Values of Case-to-Heatsink
(NOM)+1V. To express these thresholds in terms of output voltage change, multiply by the Error amplifier gain, which is V
REF
SHUTDOWN
Silicone grease
Dry interface
Mica with grease
V
OUT
(V
1.1V, VOUT = V
IN
−1V), 2.3V V
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O
(NOM).
IN
30V, 100µA I
IN
(Continued)
= 20V (3W pulse) for T = 10 ms.
Quiescent Current
Ground Pin Current
L
1.0
1.3
1.4
250mA.
IN
= 2.5V to V
O
(NOM)+1V and the other test for V
5
Thermal Resistance (˚C/W) (Data from Thermalloy)
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TABLE 2. Typical Values of Case-to-Heatsink
Thermasil III
Thermasil II
Thermalfilm (0.002) with grease
IN
= 2.5V to V
Ground Pin Current vs Load
Output Noise Voltage
O
(NOM)+1V to 30V.
OUT
/V
REF
= (R1+R2)/R2.
1.3
1.5
2.2
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