LP2950ACZ-3.3 Datasheet, PDF (6/42 Pages) Texas Instruments – LP2950-N/LP2951-N Series of Adjustable Micropower Voltage Regulators

LP2950-N, LP2951-N
SNVS764N – JANUARY 2000 – REVISED MAY 2013
ELECTRICAL CHARACTERISTICS⁽¹⁾ (continued)
Parameter
Conditions ⁽¹⁾
Error Comparator
Output Leakage
Current
Output Low Voltage
V_OH = 30V
V_in = (V_ONOM − 0.5)V
I_OL = 400μA
LP2951
Typ
Tested
Limit ^{(2) (3)}
0.01
1
2
150
250
400
Upper Threshold
Voltage
Lower Threshold
Voltage
See ⁽¹³⁾
See ⁽¹³⁾
60
40
25
75
95
140
Hysteresis
Shutdown Input
Input
Logic
Voltage
Shutdown Pin Input
Current
See ⁽¹³⁾
Low (Regulator ON)
High (Regulator OFF)
V_shutdown = 2.4V
V_shutdown = 30V
Regulator Output
Current in Shutdown
See ⁽¹⁴⁾
15
1.3
0.6
2.0
30
50
100
450
600
750
3
10
20
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LP2950AC-XX
LP2951AC-XX
LP2950C-XX
LP2951C-XX
Typ Tested Design Typ Tested Design
Limit⁽²⁾ Limit⁽⁴⁾
Limit⁽²⁾ Limit⁽⁴⁾
Units
0.01 1
150 250
60
40
75
95
15
0.01 1
2
150 250
400
60
40
25
75
95
140
15
μA max
2 μA max
mV
max
400
mV
max
mV min
25 mV min
mV
max
140
mV
max
mV
1.3
30
50
450 600
3
10
1.3
0.7
2.0
30
50
100
450 600
750
3
10
20
V
0.7 V max
2.0 V min
μA max
100 μA max
μA max
750 μA max
μA max
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_ONOM + 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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