LP2950-N, LP2951-N
SNVS764N –JANUARY 2000–REVISED MAY 2013
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ELECTRICAL CHARACTERISTICS(1) (continued)
LP2950AC-XX
LP2951AC-XX
LP2950C-XX
LP2951C-XX
LP2951
Parameter
Conditions(1)
Units
Typ
Tested
Typ
Tested Design Typ
Limit(2) Limit(4)
Tested Design
Limit(2) Limit(4)
Limit(2)(3)
Error Comparator
Output Leakage
Current
VOH = 30V
0.01
150
1
2
0.01
150
1
0.01
150
1
μA max
μA max
2
2
Output Low Voltage
Vin = (VONOM − 0.5)V
IOL = 400μA
250
250
250
mV
max
400
400
25
400
mV
max
Upper Threshold
Voltage
See(13)
See(13)
60
75
40
25
95
60
75
40
95
60
75
40
25
95
mV min
mV min
Lower Threshold
Voltage
mV
max
140
140
140
mV
max
Hysteresis
Shutdown Input
Input
See(13)
15
15
15
mV
1.3
1.3
1.3
V
Logic
Low (Regulator ON)
High (Regulator OFF)
Vshutdown = 2.4V
0.6
2.0
50
0.7
2.0
0.7
V max
V min
Voltage
2.0
Shutdown Pin Input
Current
30
450
3
30
450
3
50
600
10
30
450
3
50
100
600
750
10
μA max
μA max
μA max
μA max
μA max
μA max
100
600
750
10
100
750
20
Vshutdown = 30V
See(14)
Regulator Output
Current in Shutdown
20
20
(13) 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 specified to go low when the output
drops by 95 mV × 5V/1.235V = 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% ensured.
(14) VSHUTDOWN ≥ 2V, VIN ≤ 30V, VOUT = 0, Feedback pin tied to VTAP
.
6
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