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參數(shù)資料
| 型號(hào)： | LM2990T-5.2 |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | Cap-Free, NMOS, 150mA Low Dropout Regulator with Reverse Current Protection |
| 中文描述： | 5.2 V FIXED NEGATIVE LDO REGULATOR, 1 V DROPOUT, PSFM3 |
| 封裝： | PLASTIC, TO-220, 3 PIN |
| 文件頁數(shù)： | 4/12頁 |
| 文件大?。?/td> | 421K |
| 代理商： | LM2990T-5.2 |
Electrical Characteristics
(Continued)
V
= 5V + V
(Note 6) , I
O
= 1A, C
= 47 μF, unless otherwise specified.
Boldface
limits apply over the entire operat-
ing temperature range, 40C
≤
T
J
≤
125C, all other limits apply for T
J
= 25C.
LM2990-12
Typ
(Note 4)
1.2
1.8
52
LM2990-15
Typ
(Note 4)
1.0
1.8
52
Units
(Limit)
Parameter
Conditions
Limit
(Note 5)
0.9
1.4
42
Limit
(Note 5)
0.75
1.4
42
Short Circuit Current
Maximum Output Current
Ripple Rejection
R
L
= 1
(Note 7)
(Note 7)
V
ripple
= 1 V
rms
,
ripple
= 1 kHz, I
O
= 5 mA
10 Hz–100 kHz, I
O
= 5 mA
1000 Hours
A (min)
A (min)
dB (min)
Output Noise Voltage
Long Term Stability
500
2000
1500
600
2000
1800
μV (max)
ppm
Note 1:
Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device 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
resistor.
Note 3:
The maximum power dissipation is a function of T
,
θ
, and T
. The maximum allowable power dissipation at any ambient temperature is P
= (T
T
A
)/
θ
JA
. If this dissipation is exceeded, the die temperature will rise above 125C, and the LM2990 will eventually go into thermal shutdown at a T
J
of approximately
160C. For the LM2990, the junction-to-ambient thermal resistance, is 53C/W, 73C/W for the TO-263, and the junction-to-case thermal resistance is 3C. If the
TO-263 package is used, the thermal resistance can be reduced by increasing the P.C. board copper area thermally connected to the package. Using 0.5 square
inches of copper area,
θ
JA
is 50C/W; with 1 square inch of copper area,
θ
JA
is 37C/W; and with 1.6 or more square inches of copper area,
θ
JA
is 32C/W.
Note 4:
Typicals are at T
J
= 25C and represent the most likely parametric norm.
Note 5:
Limits are guaranteed and 100% production tested.
Note 6:
V
O(NOM)
is the nominal (typical) regulator output voltage, 5V, 5.2V, 12V or 15V.
Note 7:
The short circuit current is less than the maximum output current with the 12V and 15V versions due to internal foldback current limiting. The 5V and
5.2V versions, 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.
Definition of Terms
Dropout Voltage:
The input-output voltage differential at
which the circuit ceases to regulate against further reduction
in input voltage. Measured when the output voltage has
dropped 100 mV from the nominal value obtained at (V
+
5V) input, dropout voltage is dependent upon load current
and junction temperature.
Input Voltage:
The DC voltage applied to the input terminals
with respect to ground.
Input-Output Differential:
The voltage difference between
the unregulated input voltage and the regulated output volt-
age for which the regulator will operate.
Line Regulation:
The change in output voltage for a change
in the input voltage. The measurement is made under condi-
tions of low dissipation or by using pulse techniques such
that the average chip temperature is not significantly af-
fected.
Load Regulation:
The change in output voltage for a
change in load current at constant chip temperature.
Long Term Stability:
Output voltage stability under accelle-
rated life-test conditions after 1000 hours with maximum
rated voltage and junction temperature.
Output Noise Voltage:
The rms AC voltage at the output,
with constant load and no input ripple, measured over a
specified frequency range.
Quiescent Current:
That part of the positive input current
that does not contribute to the positive load current. The
regulator ground lead current.
Ripple Rejection:
The ratio of the peak-to-peak input ripple
voltage to the peak-to-peak output ripple voltage.
Temperature Stability of V
:
The percentage change in
output voltage for a thermal variation from room temperature
to either temperature extreme.
www.national.com
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