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參數(shù)資料
| 型號： | A8205SLH |
| 廠商： | Allegro MicroSystems, Inc. |
| 英文描述： | LOW-DROPOUT REGULATORS . HIGH EFFICIENCY |
| 中文描述： | 低壓差穩(wěn)壓器。高效 |
| 文件頁數(shù)： | 4/8頁 |
| 文件大?。?/td> | 122K |
| 代理商： | A8205SLH |
8205
LOW-DROPOUT
REGULATORS
115 Northeast Cutoff, Box 15036
Worcester, Massachusetts 01615-0036 (508) 853-5000
APPLICATIONS INFORMATION
Linear regulators require input and output capacitors in order to
maintain over-all loop stability. The recommended minimum
value for the input capacitor is 0.1
μ
F. The output capacitor is
the dominant pole that provides the high-frequency compensa-
tion required for over-all regulator loop stability. These devices
are stable with as little as 1
μ
F. However, to ensure stable
operation under all conditions and capacitor types, the recom-
mended minimum value is 4.7
μ
F. The output capacitor may be
partially distributed through the load circuits. However, at least
1
μ
F should be connected at the regulator using the shortest and
widest foil pattern possible.
The A8205SLH-ADJ requires an external voltage divider to set
up the desired regulated output voltage between 2.0 V and 6.8 V
(V
I
≤
7 V). The two resistors are chosen such that
V
O
= 1.26 (R
1
+ R
2
)/R
2
.
The resistor values are usually as high as possible to maintain
high circuit efficiency, but R
2
should be less than 300 k
.
Dwg. ES-015
ENABLE
(ACTIVE HIGH)
INPUT
(7.0 V MAX)
OUTPUT (2.0 V TO 6.8 V)
0.1
μ
F
(MIN)
1
μ
F
(MIN)
R1
R2
(300 k
MAX)
VR
2
3
1
5
4
Thermal Considerations
These devices are intended to provide more than 150 mA of
continuous current in a very small package. The table on page 2
of this data sheet gives the maximum allowable average output
current for a worst-case printed circuit design (R
θ
JA
= 220
°
C/W
with a minimum footprint). Performance improvement is easily
accomplished with the addition of 1 square inch of copper at
terminal 2 (R
θ
JA
= 170
°
C/W).
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