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參數(shù)資料
| 型號： | AMS2942BS |
| 廠商： | Advanced Monolithic Systems, Inc. |
| 元件分類： | 基準電壓源/電流源 |
| 英文描述： | Cap-Free, NMOS, 150mA Low Dropout Regulator with Reverse Current Protection |
| 中文描述： | 無電容，NMOS管，150mA的低壓差穩(wěn)壓器的反向電流保護 |
| 文件頁數(shù)： | 3/7頁 |
| 文件大小： | 68K |
| 代理商： | AMS2942BS |
Advanced Monolithic Systems, Inc.
6680B Sierra Lane, Dublin, CA 94568 Phone (925) 556-9090 Fax (925) 556-9140
AMS2942
BLOCK DIAGRAM AND TYPICAL APPLICATIONS
AMS2942
Note 1:
Absolute Maximum Ratings are limits beyond which damage to the device may occur. Operating Ratings are conditions under which operation of the
device is guaranteed. Operating Ratings do not imply guaranteed performance limits. For guaranteed performance limits and associated test conditions, see the
Electrical Characteristics tables.
Note 2:
Unless otherwise specified all limits guaranteed for V
IN
= (
V
ONOM
+1)V, I
L
= 100
μ
A and C
L
= 1
μ
F. Limits appearing in
boldface
type apply over the
entire junction temperature range for operation. Limits appearing in normal type apply for T
A
= T
J
= 25
°
C, V
SHUTDOWN
≤
0.8V.
Note 3:
Guaranteed and 100% production tested.
Note 4:
Guaranteed but not 100% production tested. These limits are not used to calculate outgoing AQL levels.
Note 5:
Dropout voltage is defined as the input to output differential at which the output voltage drops 100 mV below its nominal value measured at 1V differential.
At very low values of programmed output voltage, the minimum input supply voltage of 2V ( 2.3V over temperature) must be taken into account.
Note 6:
Comparator thresholds are expressed in terms of a voltage differential at the feedback terminal below the nominal reference voltage measured at
V
IN
= (
V
ONOM
+1)V. To express these thresholds in terms of output voltage change, multiply by the error amplifier gain = Vout/Vref = (R1 + R2)/R2. For example,
at a programmed output voltage of 5V, the error output is guaranteed to go low when the output drops by 95 mV x 5V/1.235 = 384 mV. Thresholds remain constant
as a percent of V
out
as V
out
is varied, with the dropout warning occurring at typically 5% below nominal, 7.5% guaranteed.
Note 7:
V
ref
≤
V
out
≤
(V
in
- 1V), 2.3
≤
V
in
≤
42V, 100
μ
A
≤
I
L
≤
100 mA, T
J
≤
T
JMAX
.
Note 8:
The junction-to-ambient thermal resistance is 120
°
C/W for the molded plastic SO-8 (S), when the package is soldered directly to the PCB.
Note 9:
V
SHUTDOWN
≥
2.5V, V
IN
≤
42V, V
OUT
=0.
Note 10:
Output or reference voltage temperature coefficients defined as the worst case voltage change divided by the total temperature range.
Note 11:
Thermal regulation is defined as the change in output voltage at a time T after a change in power dissipation is applied, excluding load or line regulation
effects. Specifications are for a 50mA load pulse at V
IN
=42V (1.25W pulse) for T =10 ms.
Note 12:
Regulation is measured at constant junction temperature, using pulse testing with a low duty cycle. Changes in output voltage due to heating effects are
covered under the specification for thermal regulation.
Note 13
: Line regulation is tested at 150
°
C for I
L
= 1 mA. For I
L
= 100
μ
A and T
J
= 125
°
C, line regulation is guaranteed by design to 0.2%. See typical
performance characteristics for line regulation versus temperature and load current.
INPUT
OUTPUT
GROUND
ERROR
AMPLIFIER
1.23V
REFERENCE
39V to 45V UNREGULATED DC
+
+
+
+
-
SHUT-
DOWN
FEED-
BACK
ERROR
TO CMOS
OR TTL
+
-
+
330k
FROM
CMOS
OR TTL
50mV
ERROR DETECTION COMPARATOR
298k
10k
10
μ
F
V
O
= 38V
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