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LP2950 Datasheet(PDF) 3 Page - Advanced Monolithic Systems

Part # LP2950
Description  100mA LOW DROPOUT VOLTAGE REGULATOR
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Manufacturer  ADMOS [Advanced Monolithic Systems]
Direct Link  http://www.advanced-monolithic.com
Logo ADMOS - Advanced Monolithic Systems

LP2950 Datasheet(HTML) 3 Page - Advanced Monolithic Systems

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Advanced Monolithic Systems, Inc.
6680B Sierra Lane, Dublin, CA 94568 Phone (925) 556-9090 Fax (925) 556-9140
LP2950/LP2951
ELECTRICAL CHARACTERISTICS (Note 2) (Continued)
PARAMETER
CONDITIONS
(Note 2)
LP2950AC
LP2951AC
Min.
Typ.
Max.
LP2950C
LP2951C
Min.
Typ.
Max.
Units
Output Noise,
10Hz to 100KHz
CL = 1µF
CL = 200 µF
CL = 13.3 µF
(Bypass = 0.01
µF pins 7 to
1(LP2951))
430
160
100
430
160
100
µV rms
µV rms
µV rms
8-Pin Versions only
LP2951AC
LP2951C
Reference Voltage
1.22
1.235
1.25
1.21
1.235
1.26
V
Reference Voltage
Over Temperature (Note 7)
1.19
1.27
1.185
1.285
V
Feedback Pin Bias Current
40
60
40
60
nA
Reference Voltage Temperature
Coefficient
( Note 12 )
20
50
ppm/°C
Feedback Pin Bias Current
Temperature Coefficient
0.1
0.1
nA/°C
Error Comparator
Output Leakage Current
V
OH
= 30V
0.01
1
0.01
1
µA
Output Low Voltage
Vin = 4.5V
IOL = 400µA
150
250
150
250
mV
Upper Threshold Voltage
(Note 6)
40
60
40
60
mV
Lower Threshold Voltage
(Note 6)
75
95
75
95
mV
Hysteresis
(Note 6)
15
15
mV
Shutdown Input
Input logic Voltage
Low (Regulator ON)
High (Regulator OFF)
2
1.3
0.7
2
1.3
0.7
V
V
Shutdown Pin Input Current
(Note 3)
Vs = 2.4V
Vs = 30V
30
450
50
600
30
450
50
600
µA
µA
Regulator Output Current in
Shutdown (Note 3)
(Note 11)
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 C
L = 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
≤V
out
≤ (V
in - 1V), 2.3
≤V
in
≤30V, 100µA≤I
L
≤ 100 mA, T
J
≤ T
JMAX.
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, V
in
≤ 30V, V
out =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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