SNVS764Q – JANUARY 2000 – REVISED DECEMBER 2017
Electrical Characteristics (continued)
over operating free-air temperature range (unless otherwise noted)
PARAMETER
TEST CONDITIONS
(1)
LP2951
(2)
MIN
ERROR COMPARATOR
V
OH
= 30 V
Output leakage
current
V
OH
= 30 V, –40°C
≤
T
J
≤
125°C
V
IN
= (V
O
NOM
−
0.5 V),
I
OL
= 400 µA
Output low voltage
V
IN
= (V
O
NOM
−
0.5 V),
I
OL
= 400 µA,
–40°C
≤
T
J
≤
125°C
See
(12)
Upper threshold
voltage
See
(12)
, –40°C
≤
T
J
≤
125°C
See
(12)
Lower threshold
voltage
Hysteresis
SHUTDOWN INPUT
Input
Logic voltage
Logic voltage
Low (Regulator ON),
–40°C
≤
T
J
≤
125°C
High (Regulator OFF),
–40°C
≤
T
J
≤
125°C
V
shutdown
= 2.4 V
Shutdown pin input
current
V
shutdown
= 30 V
V
shutdown
= 2.4 V
–40°C
≤
T
J
≤
125°C
450
2
2
30
50
100
100
600
750
750
3
10
20
20
20
3
10
3
750
10
450
600
450
100
600
30
50
2
30
50
1.3
0.6
0.7
0.7
1.3
1.3
V
V
(4)
V
(5)
V
(4)
V
(5)
µA
(4)
µA
(4)
µA
(5)
µA
(4)
µA
(4)
µA
(5)
µA
(4)
µA
(4)
µA
(5)
See
(12)
, –40°C
≤
T
J
≤
125°C
See
(12)
15
40
25
25
75
95
140
140
15
15
140
75
95
25
75
95
60
150
0.01
1
2
2
250
400
150
250
400
400
40
60
40
60
150
2
250
400
400
0.01
1
0.01
1
µA
(4)
µA
(4)
µA
(5)
mV
(4)
mV
(4)
mV
(5)
mV
(4)
mV
(4)
mV
(5)
mV
(4)
mV
(4)
mV
(5)
mV
TYP
MAX
LP2950AC-XX
LP2951AC-XX
MIN
TYP
MAX
LP2950C-XX
LP2951C-XX
MIN
TYP
MAX
UNIT
V
shutdown
= 30 V,
–40°C
≤
T
J
≤
125°C
Regulator output
current in
shutdown
See
(13)
–40°C
≤
T
J
≤
125°C
(12) Comparator thresholds are expressed in terms of a voltage differential at the FEEDBACK pin 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 5 V, the ERROR output is specified to go low when the
output drops by 95 mV × 5 V / 1.235 V = 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.
(13) V
SHUTDOWN
≥
2 V, V
IN
≤
30 V, V
OUT
= 0, FEEDBACK pin tied to V
TAP
.
Copyright © 2000–2017, Texas Instruments Incorporated
9
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