SNVS764N – JANUARY 2000 – REVISED MAY 2013
ELECTRICAL CHARACTERISTICS
(continued)
LP2951
Parameter
Conditions
(1)
Typ
Tested
Limit
(2) (3)
1
2
V
in
= (V
O
NOM
−
0.5)V
I
OL
= 400μA
150
250
400
Upper Threshold
Voltage
Lower Threshold
Voltage
See
(13)
See
(13)
60
75
40
25
95
140
Hysteresis
Shutdown Input
Input
Logic
Voltage
Shutdown Pin Input
Current
Low (Regulator ON)
High (Regulator OFF)
V
shutdown
= 2.4V
V
shutdown
= 30V
Regulator Output
Current in Shutdown
See
(14)
LP2950AC-XX
LP2951AC-XX
Typ
Tested
Limit
(2)
1
2
150
250
400
60
75
40
25
95
140
15
1.3
15
1.3
0.7
2.0
30
450
3
50
100
600
750
10
20
3
450
30
75
60
150
Design Typ
Limit
(4)
0.01
LP2950C-XX
LP2951C-XX
Tested
Limit
(2)
1
2
250
400
40
25
95
140
Design
Limit
(4)
Units
Error Comparator
Output Leakage
Current
Output Low Voltage
V
OH
= 30V
0.01
0.01
μA
max
μA
max
mV
max
mV
max
mV min
mV min
mV
max
mV
max
mV
V
0.7
2.0
50
100
600
750
10
20
V max
V min
μA
max
μA
max
μA
max
μA
max
μA
max
μA
max
See
(13)
15
1.3
0.6
2.0
30
450
3
50
100
600
750
10
20
(13) Comparator thresholds are expressed in terms of a voltage differential at the Feedback terminal below the nominal reference voltage
measured at V
in
= (V
O
NOM + 1)V. To express these thresholds in terms of output voltage change, multiply by the error amplifier gain =
V
OUT
/V
REF
= (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 V
out
as V
out
is varied, with the dropout warning
occurring at typically 5% below nominal, 7.5% ensured.
(14) V
SHUTDOWN
≥
2V, V
IN
≤
30V, V
OUT
= 0, Feedback pin tied to V
TAP
.
6
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