lm2991sep National Semiconductor Corporation, lm2991sep Datasheet - Page 3

• Manufacturer Part Number: lm2991sep
• Description: Negative Low Dropout Adjustable Regulator
• Manufacturer: National Semiconductor Corporation

Reference Voltage
Output Voltage
Range
Line Regulation
Load Regulation
Dropout Voltage
Quiescent Current
Dropout Quiescent
Current
Ripple Rejection
Output Noise
ON /OFF Input
Voltage
ON /OFF Input
Current
Output Leakage
Current
Current Limit
Electrical Characteristics
Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the deivce is in-
tended to be functional, but do not guarantee specific performance limits. For guaranteed specifications and test conditions, see the Electrical Characteristics.
Note 2: Human body model, 100 pF discharged through a 1.5 k
Note 3: The maximum power dissipation is a function of T
− T
junction-to-ambient thermal resistance is 53˚C/W for the TO-220, 73˚C/W for the TO-263, and junction-to-case thermal resistance is 3˚C. If the TO-263 package is
used, the thermal resistance can be reduced by increasing the PC board copper area thermally connected to the package. Using 0.5 square inches of copper area,
Note 4: Typicals are at T
V
the entire operating junction temperature range.
Absolute Maximum Ratings
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Input Voltage
ESD Susceptibility (Note 2)
Power Dissipation (Note 3)
Junction Temperature (T
JA
IN
A
is 50˚C/W; with 1 square inch of copper area,
)/
= −10V, V
Parameter
JA
. If this dissipation is exceeded, the die temperature will rise above 125˚C and the LM2991 will go into thermal shutdown. For the LM2991, the
O
= −3V, I
J
= 25˚C and represent the most likely parametric norm.
Jmax
O
5 mA
5 mA
V
V
I
50 mA
I
I
I
V
V
I
10 Hz − 100 kHz, I
(V
(V
V
V
V
V
V
O
O
O
O
O
= 1A, C
O
IN
IN
ripple
ON/OFF
ON/OFF
IN
OUT
OUT
OUT
OUT
)
= 5 mA, V
= 0.1A, V
= 1A, V
= 5 mA
− 1V
= −26V
= V
= −26V, V
1A
: ON)
: OFF)
= 0V
= 0V
= 1 Vrms, f
O
I
I
O
O
O
= 0.8V (V
= 2.4V (V
, I
I
O
= 47 µF, R1 = 2.7k, T
V
O
O
IN
1A
1A,
O
O
1A
JA
ON/OFF
Conditions
1A
− 1V
100 mV
is 37˚C/W; and with 1.6 or more square inches of copper area,
−26V
100 mV
Internally limited
ripple
OUT
OUT
O
Jmax
−26V to +0.3V
(Note 1)
= 5 mA
= 2.4V
: ON)
: OFF)
V
,
= 1 kHz,
IN
JA
resistor.
and T
125˚C
−26V
2 kV
A
. The maximum allowable power dissipation at any ambient temperature is P
J
= 25˚C, unless otherwise specified. Boldface limits apply over
3
Storage Temperature Range
Lead Temperature (Soldering, 10 sec.)
Operating Ratings
Junction Temperature Range (T
Maximum Input Voltage (Operational)
(Note 4)
Typical
−1.210
0.004
0.04
−25
200
0.1
0.6
0.7
1.2
1.3
0.1
−2
16
60
40
60
2
−1.234
−1.27
Min
−24
JA
2.4
1.5
50
is 32˚C/W.
(Note 1)
J
)
−1.186
−1.15
Max
0.04
450
100
250
0.4
0.2
0.3
0.8
0.8
−3
50
10
1
5
−65˚C to +150˚C
−40˚C to +125˚C
www.national.com
D
= (T
230˚C
Units
%/V
−26V
mA
mA
dB
µV
µA
µA
%
V
V
V
V
V
V
V
A
Jmax