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參數(shù)資料
| 型號： | AMS2954C-X |
| 廠商： | Advanced Monolithic Systems, Inc. |
| 元件分類： | 基準(zhǔn)電壓源/電流源 |
| 英文描述： | 250mA LOW DROPOUT VOLTAGE REGULATOR |
| 中文描述： | 250mA的低壓差穩(wěn)壓器 |
| 文件頁數(shù)： | 12/15頁 |
| 文件大?。?/td> | 169K |
| 代理商： | AMS2954C-X |
Advanced Monolithic Systems, Inc.
6680B Sierra Lane, Dublin, CA 94568 Phone (925) 556-9090 Fax (925) 556-9140
AMS2954
TYPICAL APPLICATIONS
(Continued)
2 Ampere Low Dropout Regulator
Regulator with Early Warning and Auxiliary Output
ERROR
ERROR
FLAG
CURRENT
LIMIT
SECTION
GND
FB
V
OUT
SD
1
4
3
8
5
7
+V
IN
+V
IN
= V
OUT
+.5V
AMS2954
+V
OUT
@ 2A
R
1
R
2
10k
100
μ
F
4.7
TANT.
+
+
1%
220
.033
20k
4.7M
2N3906
0.05
680
470
MJE2955
ERROR
GND
FB
V
OUT
5
4
8
1
6
+V
IN
AMS2954
#1
V
TAP
7
ERROR
GND
FB
V
OUT
4
8
6
+V
IN
V
TAP
AMS2954
#2
3
SD
7
SENSE
2
5
RESET
1
μ
F
20
+V
IN
D
1
D
2
3.6V
NICAD
27 k
2.7M
330 k
MAIN 5V OUTPUT
1
μ
F
D
4
Q
1
μ
P
V
DD
2
D
3
5V MEMORY
SUPPLY
EARLY WARNING
SENSE
+
+
VOUT = 1.23V(1+R1/R2)
For 5V V
OUT
, use internal resistors. Wire pin 6 to 7 and pin 2 to +V
OUT
Buss.
Operation: Reg.#1’s V
OUT
is programmed one diode drop above 5V. It’s error flag
becomes active when V
≤
5.7V. When V
drops below 5.3V, the error flag of
Reg.#2 becomes active and via Q1 latches the main output off. When V
IN
again
exceeds 5.7V Reg.#1 is back in regulation and the early warning signal rises,
unlatching Reg.#2 via D3.
Early warning flag on low input voltage
Main output latches off at lower input voltages
Battery backup on auxiliary output
1A Regulator with 1.2V Dropout
Latch Off When Error Flag Occurs
OUTPUT
5V ± 1% @
0 TO 1A
GND
FB
OUT
IN
4
7
6
1
2
8
V
TAP
AMS2954
SUPERTEX
VP12C
SENSE
0.002μ
F
2
k
10
k
1Μ
0.01μ
F
220μ
F
1μ
F
+
I
Q
400
μ
A
UNREGULATE
D INPUT
R
1
ERROR
GND
FB
V
OUT
R
2
SD
7
4
3
8
1
5
+V
IN
+V
IN
V
OUT
1
μ
F
+
470k
AMS2954
470k
RESET
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