lm2990-5.0mw8 National Semiconductor Corporation, lm2990-5.0mw8 Datasheet - Page 4

• Manufacturer Part Number: lm2990-5.0mw8
• Description: Lm2990qml Negative Low Dropout Regulator
• Manufacturer: National Semiconductor Corporation

www.national.com
V
V
V
V
I
I
I
RR
V
Q
OS
Max
O
RLine
RLoad
DO
On
Symbol
LM2990-5.0 Electrical Characteristics
DC Parameters
The following conditions apply, unless otherwise specified. V
Note 2: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is
functional, but do not guarantee specific performance limits. For guaranteed specifications and test conditions, see the Electrical Characteristics. The guaranteed
specifications apply only for the test conditions listed. Some performance characteristics may degrade when the device is not operated under the listed test
conditions.
Note 3: The maximum power dissipation must be derated at elevated temperatures and is dictated by T
junction to ambient thermal resistance), and T
θ
Note 4: The package material for these devices allows much improved heat transfer over our standard ceramic packages. In order to take full advantage of this
improved heat transfer, heat sinking must be provided between the package base (directly beneath the die), and either metal traces on, or thermal vias through,
the printed circuit board. Without this additional heat sinking, device power dissipation must be calculated using θ
not be assumed that the device leads will provide substantial heat transfer out of the package, since the thermal resistance of the leadframe material is very poor,
relative to the material of the package base. The stated θ
resistance between the package base and the printed circuit board. The user must determine the value of the additional thermal resistance and must combine
this with the stated value for the package, to calculate the total allowed power dissipation for the device.
Note 5: Human body model, 1.5 kΩ in series with 100 pF.
Note 6: V
Note 7: The −5V version, tested with a lower input voltage, does not reach the foldback current limit and therefore conducts a higher short circuit current level.
If the LM2990 output is pulled above ground, the maximum allowed current sunk back into the LM2990 is 1.5A.
JA
or the number given in the Absolute Maximum Ratings, whichever is lower.
O Nom
Output Voltage
Line Regulation
Load Regulation
Dropout Voltage
Quiescent Current
Short Circuit Current
Maximum Output Current
Ripple Rejection
Output Noise Voltage
is the nominal (typical) regulator output voltage, −5V.
Parameter
A
(ambient temperature). The maximum allowable power dissipation at any temperature is P
5mA
I
V
50mA
I
I
I
I
R
V
I
10Hz-100Khz, I
O
O
O
O
O
O
JC
O Nom
L
Ripple
= 5mA,
= 0.1A, ΔV
= 1A, ΔV
≤
= 1A, V
= 5mA
= 1Ω
thermal resistance is for the package material only, and does not account for the additional thermal
1A
≤
≤
= 1V
-1V > V
I
O
I
O
≤
IN
Conditions
≤
RMS
O
1A
= V
1A
O
≤
IN
, F
≤
100mV
O
O Nom
IN
> -26V
100mV
= 5mA
Ripple
4
= −5V + V
= 1KHz,
O Nom
, I
(Note
(Note
O
Notes
= 1A, C
Jmax
(maximum junction temperature), θ
7)
7)
O
JA
-5.10 -4.90
-5.25 -4.75
, rather than θ
= 47µF
Min
1.5
1.3
1.5
50
Max
100
750
(Note
0.3
1.0
5.0
40
70
10
50
JC
, thermal resistance. It must
6)
Unit
mV
mV
mV
mA
mA
mA
dB
µV
Dmax
V
V
V
V
A
A
A
= (T
JA
(package
Jmax
groups
1, 2, 3
1, 2, 3
1, 2, 3
1, 2, 3
1, 2, 3
- T
Sub-
2, 3
2, 3
2, 3
2, 3
1
1
1
1
1
1
A
)/