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參數(shù)資料
| 型號： | LM2940T-9.0 |
| 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： | 9 V FIXED POSITIVE LDO REGULATOR, 1 V DROPOUT, PSFM3 |
| 封裝： | PLASTIC, TO-220, 3 PIN |
| 文件頁數(shù)： | 3/5頁 |
| 文件大小： | 196K |
| 代理商： | LM2940T-9.0 |
Bay Linear, Inc
2478 Armstrong Street, Livermore, CA 94550 Tel: (925) 989-7144, Fax: (925) 940-9556 www.baylinear.com
LM2940/2941
ENABLE Input LM2941
Input Logic Voltage
Low (OFF)
High (ON)
2.4
0.8
V
V
EN
= 26V
100
600
750
2.5
5
500
V
Enable Pin
Input Current
V
EN
= 0.8V
μ
A
Regulator Output
Current in Shutdown
NOTES:
The Bold specifications apply to the full operating temperature range.
Note 1: Maximum positive supply voltage of 60V must be of limited duration (<100msec) and duty cycle.) The maximum continuous supply voltage is 26V.
Note 2: Full load current (I
FL
) is defined as 1.25A for the LM2941.
Note 3: Dropout voltage is defined as the input-to output differential when the output voltage drops to 99% of its nominal value with V
OUT
+ 1V applied to V
IN
.
Note 4: VIN = V
OUT
(NOMINAL)
+1V. For example, use V
IN
= 4.3V for a 3.3V regulator. Employ pulse-testing procedures to minimize temperature rise.
Note 5: Ground pin current is the regulator quiescent current. The total current drawn from the source is the sum of the load current to the ground current.
Note 6: Output voltage temperature coefficient is defined as the worst case voltage changed divided by the total temperature range.
Note 7: Thermal regulation is defined as the change in the output voltage at a time T after a change in power dissipation is applied, excluding load or line regulation
effects. Specifications are for a 200mA load pulse as V
IN
= 20V (a 4W pulse) for T = 10ms.
Note 8: VREF
≤
V
OUT
≤
(V
IN
- 1), 2.3V
≤
V
IN
≤
26V, 10mA < I
L
≤
I
FL
, T
J
≤
T
JMAX
Note 9: Comparator threshold is expressed in terms of a voltage differential at the Adjust terminal below the nominal reference voltage measured 6V input. To express
these thresholds in terms of output voltage change, multiply the error amplifier gain = V
OUT
/V
REF
= (R1 + R2)/R2. For example, at a programmable output voltage of
5V, the Error output is guaranteed to go low when the output drops by 95mVx 5V/ 1.240V = 38mV. Threshold remains constant as a percent of V
OUT
as V
OUT
is varied,
with the dropout warning occurring at typically 5% below nominal, 7.7% guaranteed.
Note 10: V
EN
≤
0.8V and V
IN
≤
26V, V
OUT
= 0.
BLOCK DIAGRAM
(Note 10)
10
μ
A
Reference
Thermal
Shutdown
EN
IN
OUT
ADJ
GND
O.V
I
LIMIT
28V
R1*
R2*
1.180V
1.240V
+
+
-
-
FLAG
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| LM2940T-8.0 | Cap-Free, NMOS, 150mA Low Dropout Regulator with Reverse Current Protection |
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| LM2940N | 1.25A High Current Low Dropout |
| LM2940S | 1.25A High Current Low Dropout |
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