If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Storage Temperature Range
Lead Temp. (Soldering, 5 seconds)
ESD Rating
Human Body Model (Note 3)
Machine Model (Note 10)
Power Dissipation (Note 2)
V
IN
Supply Voltage (Survival)
V
BIAS
Supply Voltage (Survival)
−65˚C to +150˚C
260˚C
2 kV
200V
Internally Limited
−0.3V to +6V
−0.3V to +7V
Shutdown Input Voltage (Survival)
I
OUT
(Survival)
Output Voltage (Survival)
Junction Temperature
−0.3V to +7V
Internally Limited
−0.3V to +6V
−40˚C to +150˚C
Operating Ratings
V
IN
Shutdown
I
OUT
Junction Temperature
V
BIAS
(V
OUT
+ V
DO
) to 5.5V
0 to +6V
0.8A
−40˚C to +125˚C
4.5V to 6V
Limits in standard typeface are for T
J
= 25˚C, and limits in
boldface type
apply
over the full operating temperature range. Unless otherwise specified: V
IN
= V
O
(NOM) + 1V, V
BIAS
= 4.5V, I
L
= 10 mA, C
IN
=
C
OUT
= 10 µF, V
S/D
= V
BIAS
.
MIN
(Note
5)
1.198
1.216
1.186
1.478
1.5
1.455
1.773
1.8
1.746
∆V
O
/∆V
IN
∆V
O
/∆I
L
V
DO
Output Voltage Line Regulation
(Note 7)
Output Voltage Load Regulation
(Note 8)
Dropout Voltage (Note 9)
V
O
(NOM) + 1V
≤
V
IN
≤
5.5V
10 mA
≤
I
L
≤
0.8A
I
L
= 0.8A
(TO220 and TO263 only)
I
L
= 0.8A
(PSOP only)
I
Q
(V
IN
)
Quiescent Current Drawn from
V
IN
Supply
10 mA
≤
I
L
≤
0.8A
V
I
Q
(V
BIAS
)
Quiescent Current Drawn from
V
BIAS
Supply
S/D
Electrical Characteristics
Symbol
V
O
Parameter
Output Voltage Tolerance
Conditions
10 mA
≤
I
L
≤
0.8A
V
O
(NOM) + 1V
≤
V
IN
≤
5.5V
4.5V
≤
V
BIAS
≤
6V
Typical
(Note 4)
MAX
(Note
5)
1.234
1.246
1.522
Units
V
1.545
1.827
1.854
0.01
0.04
0.06
100
115
3
0.03
1
0.03
2.5
1.3
0.7
0.7
20
15
1
−1
0.3
300
400
320
430
7
8
1
30
2
3
1
30
%/V
%/A
mV
mA
µA
mA
µA
A
≤
0.3V
L
10 mA
≤
V
S/D
≤
0.8A
≤
0.3V
I
SC
V
SDT
Td (OFF)
Td (ON)
I
S/D
Short-Circuit Current
Output Turn-off Threshold
Turn-OFF Delay
Turn-ON Delay
S/D Input Current
V
OUT
= 0V
Output = ON
Output = OFF
R
LOAD
X C
OUT
<<
Td (OFF)
R
LOAD
X C
OUT
<<
Td (ON)
V
S/D
=1.3V
V
S/D
Shutdown Input
V
µs
µA
≤
0.3V
3
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LP3891
Electrical Characteristics
Limits in standard typeface are for T
J
= 25˚C, and limits in
boldface type
apply
over the full operating temperature range. Unless otherwise specified: V
IN
= V
O
(NOM) + 1V, V
BIAS
= 4.5V, I
L
= 10 mA, C
IN
=
C
OUT
= 10 µF, V
S/D
= V
BIAS
. (Continued)
MIN
(Note
5)
Typical
(Note 4)
MAX
(Note
5)
Symbol
AC Parameters
PSRR (V
IN
)
Parameter
Conditions
Units
Ripple Rejection for V
IN
Input
Voltage
Ripple Rejection for V
BIAS
Voltage
Output Noise Density
V
IN
= V
OUT
+1V, f = 120 Hz
V
IN
= V
OUT
+ 1V, f = 1 kHz
80
65
70
65
1
150
90
µV (rms)
µV/root−Hz
dB
PSRR
(V
BIAS
)
V
BIAS
= V
OUT
+ 3V, f = 120 Hz
V
BIAS
= V
OUT
+ 3V, f = 1 kHz
f = 120 Hz
BW = 10 Hz − 100 kHz, V
OUT
=
1.8V
BW = 300 Hz − 300 kHz, V
OUT
= 1.8V
e
n
Output Noise Voltage
Note 1:
Absolute maximum ratings indicate limits beyond which damage to the component may occur. Operating ratings indicate conditions for which the device
is intended to be functional, but do not guarantee specific performance limits. For guaranteed specifications, see Electrical Characteristics. Specifications do not
apply when operating the device outside of its rated operating conditions.
Note 2:
At elevated temperatures, device power dissipation must be derated based on package thermal resistance and heatsink thermal values.
θ
J-A
for TO-220
devices is 65˚C/W if no heatsink is used. If the TO-220 device is attached to a heatsink, a
θ
J-S
value of 4˚C/W can be assumed.
θ
J-A
for TO-263 devices is
approximately 40˚C/W if soldered down to a copper plane which is at least 1.5 square inches in area.
θ
J-A
value for typical PSOP-8 PC board mounting is 166˚C/W.
If power dissipation causes the junction temperature to exceed specified limits, the device will go into thermal shutdown.
Note 3:
The human body model is a 100 pF capacitor discharged through a 1.5k resistor into each pin.
Note 4:
Typical numbers represent the most likely parametric norm for 25˚C operation.
Note 5:
Limits are guaranteed through testing, statistical correlation, or design.
Note 6:
If used in a dual-supply system where the regulator load is returned to a negative supply, the output pin must be diode clamped to ground.
Note 7:
Output voltage line regulation is defined as the change in output voltage from nominal value resulting from a change in input voltage.
Note 8:
Output voltage load regulation is defined as the change in output voltage from nominal value as the load current increases from no load to full load.
Note 9:
Dropout voltage is defined as the minimum input to output differential required to maintain the output with 2% of nominal value. The PSOP-8 package
devices have a slightly higher dropout voltage due to increased band wire resistance.
Note 10:
The machine model is a 220 pF capacitor discharged directly into each pin. The machine model ESD rating of pin 5 is 100V.
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