Datasheet

LP2950-N, LP2951-N
SNVS764N –JANUARY 2000–REVISED MAY 2013 www.ti.com
ELECTRICAL CHARACTERISTICS
(1)
(continued)
LP2950AC-XX LP2950C-XX
LP2951
LP2951AC-XX LP2951C-XX
Parameter Conditions
(1)
Units
Typ Tested Typ Tested Design Typ Tested Design
Limit
(2)(3)
Limit
(2)
Limit
(4)
Limit
(2)
Limit
(4)
Error Comparator
Output Leakage V
OH
= 30V 0.01 1 0.01 1 0.01 1 μA max
Current
2 2 2 μA max
Output Low Voltage V
in
= (V
O
NOM − 0.5)V 150 250 150 250 150 250 mV
I
OL
= 400μA max
400 400 400 mV
max
Upper Threshold See
(13)
60 40 60 40 60 40 mV min
Voltage
25 25 25 mV min
Lower Threshold See
(13)
75 95 75 95 75 95 mV
Voltage max
140 140 140 mV
max
Hysteresis See
(13)
15 15 15 mV
Shutdown Input
Input 1.3 1.3 1.3 V
Logic Low (Regulator ON) 0.6 0.7 0.7 V max
Voltage High (Regulator OFF) 2.0 2.0 2.0 V min
Shutdown Pin Input V
shutdown
= 2.4V 30 50 30 50 30 50 μA max
Current
100 100 100 μA max
V
shutdown
= 30V 450 600 450 600 450 600 μA max
750 750 750 μA max
Regulator Output See
(14)
3 10 3 10 3 10 μA max
Current in Shutdown
20 20 20 μA max
(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 Submit Documentation Feedback Copyright © 2000–2013, Texas Instruments Incorporated
Product Folder Links: LP2950-N LP2951-N