Datasheet

LP2954, LP2954A
SNVS096D –JUNE 1999–REVISED MARCH 2013 www.ti.com
Electrical Characteristics (continued)
Limits in standard typeface are for T
J
= 25°C, bold typeface applies over the −40°C to +125°C temperature range. Limits
are specified by production testing or correlation techniques using standard Statistical Quality Control (SQC) methods. Unless
otherwise noted: V
IN
= 6V, I
L
= 1 mA, C
L
= 2.2 μF.
2954AI 2954I
Symbol Parameter Conditions Typical Units
Min Max Min Max
Additional Specifications for the Adjustable Device (LP2954AIM and LP2954IM)
V
REF
See
(8)
1.230 1.215 1.245 1.205 1.255
Reference Voltage V
1.205 1.255 1.190 1.270
ΔV
REF
/ V
IN
=2.5V to 0.03 0.1 0.2
%
V
REF
VO(NOM)+1V
Reference Voltage
Line Regulation
V
IN
=2.5V to 0.2 0.4
%
VO(NOM)+1V to 30V
(9)
ΔV
REF
/ΔT Reference Voltage
Temperature See
(2)
20 ppm/°C
Coefficient
I
B
(FB) Feedback Pin Bias 20 40 40
nA
Current 60 60
I
GND
Ground Pin Current at
V
SHUTDOWN
≤1.1V 105 140 140 μA
Shutdown
(5)
I
O
(SINK) Output "OFF" Pulldown See
(10)
30 30
mA
Current 20 20
Dropout Detection Comparator
I
OH
Output "HIGH" V
OH
=30V 0.01 1 1
μA
Leakage Current 2 2
V
OL
V
IN
=V
O
(NOM)−0.5V 150 250 250
Output "LOW" Voltage mV
I
O
(COMP)=400μA 400 400
V
THR
(MAX) Upper Threshold See
(11)
−60 −80 −35 −80 −35
mV
Voltage −95 −25 −95 −25
V
THR
(MIN) Lower Threshold See
(12)
−85 −110 −55 −110 −55
mV
Voltage −160 −40 −160 −40
HYST Hysteresis See
(12)
15 mV
Shutdown Input
V
OS
(Referred to V
REF
) ±3 −7.5 7.5 −7.5 7.5
Input Offset Voltage mV
−10 10 −10 10
HYST Hysteresis 6 mV
I
B
V
IN
(S/D)=0V to 5V 10 −30 30 −30 30
Input Bias Current nA
−50 50 −50 50
(8) V
REF
≤V
OUT
≤(V
IN
−1V), 2.3V≤V
IN
≤30V, 100μA≤I
L
≤250mA.
(9) Two seperate tests are performed, one covering V
IN
=2.5V to V
O
(NOM)+1V and the other test for V
IN
=2.5V to V
O
(NOM)+1V to 30V.
(10) V
SHUTDOWN
≤1.1V, VOUT=V
O
(NOM).
(11) 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)+1V. To express these thresholds in terms of output voltage change, multiply by the Error amplifier gain,
which is V
OUT
/V
REF
=(R1+R2)/R2.
(12) 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)+1V. To express these thresholds in terms of output voltage change, multiply by the Error amplifier gain,
which is V
OUT
/V
REF
=(R1+R2)/R2.
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