Datasheet

LP4950C-5V, LP4951C
SNVS208C –SEPTEMBER 2002–REVISED APRIL 2013 www.ti.com
ELECTRICAL CHARACTERISTICS
LP4951C
Parameter Conditions
(1)
Typ Tested Limit Design Limit Units
(2) (3)
8-PIN VERSIONS ONLY
Reference Voltage 1.235 1.285 V max
1.295 V max
1.185 V min
1.165 Vmin
Reference Voltage
(4)
1.335 V max
1.135 V min
Feedback Pin Bias Current 20 40 nA max
60 nA max
Reference Voltage
(5)
50 ppm/°C
Temperature Coefficient
Feedback Pin Bias Current 0.1 nA/°C
Temperature Coefficient
Error Comparator
Output Leakage Current VOH = 30V 0.01 1 μA max
2 μA max
Output Low Voltage V
IN
= 4.5V 150 250 mV max
I
OL
= 400μA
400 mV max
Upper Threshold Voltage
(3)
60 40 mV min
25 mV min
Lower Threshold Voltage
(6)
75 95 mV max
140 mV max
Hysteresis
(6)
15 mV
Shutdown Input
Input Logic Voltage 1.3 V
Low (Regulator ON) 0.7 V max
High (Regulator OFF) 2.0 V min
Shutdown Pin Input Current V
SHUTDOWN
= 2.4V 30 50 μA max
100 μA max
V
SHUTDOWN
= 30V 450 600 μA max
750 μA max
Regulator Output Current in
(7)
3 10 μA max
Shutdown
20 μA max
(1) Unless otherwise noted all limits specified for V
IN
= 6V, I
L
= 100μA and C
L
= 1μF. Limits appearing in boldface type apply over the
entire junction temperature range for operation. Limits appearing in normal type apply for T
A
= T
J
= 25°C. Additional conditions for the 8-
pin versions are FEEDBACK tied to V
TAP
, OUTPUT tied to SENSE (V
OUT
= 5V), and V
SHUTDOWN
≤ 0.8V.
(2) Specified and 100% production tested.
(3) Specified but not 100% production tested. These limits are not used to calculate outgoing AQL levels.
(4) V
REF
≤ V
OUT
≤ (V
IN
− 1V), 2.3V ≤ V
IN
≤ 30V, 100μA ≤ I
L
≤ 100mA, T
J
≤ T
JMAX
.
(5) Output or reference voltage temperature coefficient is defined as the worst case voltage change divided by the total temperature range.
(6) Comparator thresholds are expressed in terms of a voltage differential at the Feedback terminal below the nominal reference voltage
measured at V
IN
= 6V. 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% specified.
(7) V
SHUTDOWN
≥ 2V, V
IN
≤ 30V, V
OUT
= 0, Feedback pin tied to V
TAP
.
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