LM2991S/NOPB National Semiconductor, LM2991S/NOPB Datasheet - Page 3

• Manufacturer Part Number: LM2991S/NOPB
• Description: IC REG NEG LDO ADJ V 1A TO-263-5
• Manufacturer: National Semiconductor

Specifications of LM2991S/NOPB

• Regulator Topology: Negative Adjustable
• Voltage - Output: -3 ~ -24 V
• Voltage - Input: 0.3 ~ -26 V
• Voltage - Dropout (typical): 0.6V @ 1A
• Number Of Regulators: 1
• Current - Output: 1A
• Current - Limit (min): 1.5A
• Operating Temperature: -40°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: TO-263-5, D²Pak (5 leads + Tab), TO-263BA
• Number Of Outputs: 1
• Polarity: Negative
• Input Voltage Max: 0.3 V
• Output Voltage: - 3 V to - 24 V
• Output Type: Adjustable
• Dropout Voltage (max): 0.2 V at 100 mA
• Output Current: 1 A
• Line Regulation: 0.04 %/V
• Load Regulation: 0.4 %
• Maximum Operating Temperature: + 125 C
• Mounting Style: SMD/SMT
• Minimum Operating Temperature: - 40 C
• Reference Voltage: - 1.186 V
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: *LM2991S; *LM2991S/NOPB; LM2991S

Reference Voltage
Output Voltage Range
Line Regulation
Load Regulation
Dropout Voltage
Quiescent Current
Dropout Quiescent Current V
Ripple Rejection
Output Noise
ON /OFF Input Voltage
ON /OFF Input Current
Output Leakage Current
Current Limit
Absolute Maximum Ratings
If Military/Aerospace specified devices are required,
please contact the National Semiconductor Sales Office/
Distributors for availability and specifications.
Electrical Characteristics
V
entire operating junction temperature range.
Note 1: Absolute Maximum Ratings indicate limits beyond which damage to the device 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 and test conditions, see the Electrical Characteristics.
Note 2: Human body model, 100 pF discharged through a 1.5 kΩ resistor.
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, θ
Note 4: Typicals are at T
Input Voltage
ESD Susceptibility
Power Dissipation
IN
Jmax
= −10V, V
− T
Parameter
JA
is 50°C/W; with 1 square inch of copper area, θ
A
)/θ
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
(Note
(Note
J
= 25°C and represent the most likely parametric norm.
O
= 1A, C
3)
5 mA
5 mA
V
V
I
50 mA
I
I
I
V
10 Hz − 100 kHz, I
(V
(V
V
V
V
V
2)
O
O
O
O
O
IN
IN
ripple
ON/OFF
ON/OFF
IN
OUT
OUT
OUT
= 5 mA, V
= 0.1A, ΔV
= 1A, ΔV
≤
− 1V
= −26V
= V
= −26V, V
1A
= 0V
: ON)
: OFF)
≤
≤
= 1 Vrms, f
≤
O
O
I
I
= 0.8V (V
= 2.4V (V
, I
O
O
≥
= 47 μF, R1 = 2.7 kΩ, T
I
O
O
≤
≤
V
O
≤
≤
IN
O
1A
1A,
O
≤
ON/OFF
1A
− 1V
1A
≥
≤
100 mV
−26V
Internally limited
Conditions
100 mV
ripple
OUT
OUT
O
−26V to +0.3V
≥
JA
= 5 mA
= 2.4V, V
Jmax
: ON)
: OFF)
(Note
V
is 37°C/W; and with 1.6 or more square inches of copper area, θ
= 1 kHz, I
IN
, θ
≥
JA
1)
−26V
and T
2 kV
OUT
O
J
A
. The maximum allowable power dissipation at any ambient temperature is P
= 5 mA
= 0V
= 25°C, unless otherwise specified. Boldface limits apply over the
3
Operating Ratings
Junction Temperature (T
Storage Temperature Range
Lead Temperature (Soldering, 10 sec.)
Junction Temperature Range (T
Maximum Input Voltage (Operational)
(Note
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
4)
Jmax
−1.234
−1.27
Min
−24
2.4
1.5
50
)
JA
(Note
J
)
is 32°C/W.
1)
−1.186
−1.15
−65°C to +150°C
−40°C to +125°C
Max
0.04
450
100
250
0.4
0.2
0.3
0.8
0.8
−3
50
10
1
5
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125°C
230°C
D
−26V
Units
=
%/V
mA
mA
dB
μV
μA
μA
%
V
V
V
V
V
A