LP2950 Datasheet, PDF (3/14 Pages) National Semiconductor (TI) – Series of Adjustable Micropower Voltage Regulators

LP2950/LP2951
ELECTRICAL CHARACTERISTICS (Note 2) (Continued)
PARAMETER
Output Noise,
10Hz to 100KHz
8-Pin Versions only
CONDITIONS
(Note 2)
CL = 1µF
CL = 200 µF
CL = 13.3 µF
(Bypass = 0.01 µF pins 7 to
1(LP2951))
LP2950AC
LP2951AC
Min. Typ. Max.
430
160
100
LP2951AC
LP2950C
LP2951C
Min. Typ. Max.
430
160
100
LP2951C
Units
µV rms
µV rms
µV rms
Reference Voltage
Reference Voltage
Feedback Pin Bias Current
1.22
1.235
1.25
1.21
1.235
1.26
V
Over Temperature (Note 7)
1.19
1.27
1.185
1.285
V
40
60
40
60
nA
Reference Voltage Temperature
Coefficient
Feedback Pin Bias Current
Temperature Coefficient
Error Comparator
Output Leakage Current
Output Low Voltage
Upper Threshold Voltage
Lower Threshold Voltage
Hysteresis
Shutdown Input
Input logic Voltage
Shutdown Pin Input Current
(Note 3)
Regulator Output Current in
Shutdown (Note 3)
( Note 12 )
V = 30V
OH
Vin = 4.5V
IOL = 400µA
(Note 6)
(Note 6)
(Note 6)
Low (Regulator ON)
High (Regulator OFF)
Vs = 2.4V
Vs = 30V
(Note 11)
20
50
ppm/°C
0.1
0.1
nA/°C
0.01
1
150
250
0.01
1
µA
150
250
mV
40
60
40
60
mV
75
95
75
95
mV
15
15
mV
1.3
0.7
1.3
0.7
V
2
2
V
30
50
450
600
30
50
µA
450
600
µA
3
10
3
10
µA
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: Unless otherwise specified all limits guaranteed for VIN = ( VONOM +1)V, IL = 100 µA and CL = 1 µF for 5V versions and 2.2µF for 3V and 3.3V versions.
Limits appearing in boldface type apply over the entire junction temperature range for operation. Limits appearing in normal type apply for TA = TJ = 25°C
Additional conditions for the 8-pin versions are FEEDBACK tied to VTAP, OUTPUT tied to SENSE and VSHUTDOWN ≤ 0.8V.
Note 3: Guaranteed and 100% production tested.
Note 4: Guaranteed but not 100% production tested. These limits are not used to calculate outgoing AQL levels.
Note 5: Dropout voltage is defined as the input to output differential at which the output voltage drops 100 mV below its nominal value measured at 1V differential.
At very low values of programmed output voltage, the minimum input supply voltage of 2V ( 2.3V over temperature) must be taken into account.
Note 6: Comparator thresholds are expressed in terms of a voltage differential at the feedback terminal below the nominal reference voltage measured at
VIN = ( VONOM +1)V. To express these thresholds in terms of output voltage change, multiply by the error amplifier gain = Vout/Vref = (R1 + R2)/R2. For example,
at a programmed output voltage of 5V, the error output is guaranteed to go low when the output drops by 95 mV x 5V/1.235 = 384 mV. Thresholds remain constant
as a percent of Vout as Vout is varied, with the dropout warning occurring at typically 5% below nominal, 7.5% guaranteed.
Note 7: Vref ≤Vout ≤ (Vin - 1V), 2.3 ≤Vin≤30V, 100µA≤IL≤ 100 mA, TJ ≤ TJMAX.
Note 8: The junction-to-ambient thermal resistance are as follows:180°C/W and 160°C/W for the TO-92 (N) package with 0.40 inch and 0.25 inch leads to the
printed circuit board (PCB) respectively, 105°C/W for the molded plastic DIP (P) and 160°C/W for the molded plastic SO-8 (S). The above thermal resistances for
the N, S and P packages apply when the package is soldered directly to the PCB.
Note 9: May exceed input supply voltage.
Note 10: When used in dual-supply systems where the output terminal sees loads returned to a negative supply, the output voltage should be diode-clamped to
ground.
Note 11: Vshutdown ≥ 2V, Vin ≤ 30V, Vout =0, Feedback pin tied to 5VTAP.
Note 12: Output or reference voltage temperature coefficients defined as the worst case voltage change divided by the total temperature range.
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