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參數(shù)資料
| 型號： | AAT2503 |
| 廠商： | Advanced Analog Technology,lnc. |
| 英文描述： | Adjustable 3-Channel Regulator |
| 中文描述： | 可調(diào)節(jié)的3通道穩(wěn)壓器 |
| 文件頁數(shù)： | 17/23頁 |
| 文件大?。?/td> | 1022K |
| 代理商： | AAT2503 |
AAT2503
Adjustable 3-Channel Regulator
2503.2007.04.1.1
17
Applications utilizing the exceptionally low output
noise and optimum power supply ripple rejection
characteristics of the AAT2503 should use 2.2μF or
greater for C
OUT
. If desired, C
OUT
may be increased
without limit. In low output current applications
where output load is less than 10mA, the minimum
value for C
OUT
can be as low as 0.47μF.
Capacitor Characteristics
Ceramic composition capacitors are highly recom-
mended over all other types of capacitors for use
with the AAT2503. Ceramic capacitors offer many
advantages over their tantalum and aluminum elec-
trolytic counterparts. A ceramic capacitor typically
has very low ESR, is lower cost, has a smaller PCB
footprint, and is non-polarized. Line and load tran-
sient response of the LDO regulator is improved by
using low ESR ceramic capacitors. Since ceramic
capacitors are non-polarized, they are not prone to
incorrect connection damage.
Equivalent Series Resistance
ESR is a very important characteristic to consider
when selecting a capacitor. ESR is the internal
series resistance associated with a capacitor that
includes lead resistance, internal connections, size
and area, material composition, and ambient tem-
perature. Typically, capacitor ESR is measured in
milliohms for ceramic capacitors and can range to
more than several ohms for tantalum or aluminum
electrolytic capacitors.
Ceramic Capacitor Materials
Ceramic capacitors less than 0.1μF are typically
made from NPO or C0G materials. NPO and C0G
materials generally have tight tolerance and are very
stable over temperature. Larger capacitor values
are usually composed of X7R, X5R, Z5U, or Y5V
dielectric materials. These two material types are
not recommended for use with LDO regulators since
the capacitor tolerance can vary more than ±50%
over the operating temperature range of the device.
A 2.2μF Y5V capacitor could be reduced to 1μF over
temperature; this could cause problems for circuit
operation. X7R and X5R dielectrics are much more
desirable. The temperature tolerance of X7R dielec-
tric is better than ±15%. Capacitor area is another
contributor to ESR. Capacitors which are physically
large in size will have a lower ESR when compared
to a smaller sized capacitor of an equivalent materi-
al and capacitance value. These larger devices can
improve circuit transient response when compared
to an equal value capacitor in a smaller package
size. Consult capacitor vendor datasheets carefully
when selecting capacitors for LDO regulators.
Adjustable Output Resistor Selection
The output voltage on the linear regulator is pro-
grammed with external resistors: R4 and R7 for
LDOA and R5 and R8 for LDOB. Table 3 summa-
rizes the resistor values for various output volt-
ages with R4 and R5 set to either 59k
Ω
for good
noise immunity or 221k
Ω
for reduced no load input
current.
Table 3: LDO Linear Regulators Resistor
Values for Various Output Voltages.
LDO
V
OUT
(V)
0.6*
0.8
0.9
1.0
1.1
1.2
1.3
1.4
1.5
1.8
1.85
2.0
2.5
3.3
R7, R8 = 59k
Ω
R4, R5 (k
Ω
)
0
19.6
29.4
39.2
49.9
59.0
68.1
78.7
88.7
118
124
137
187
267
R7, R8 = 221k
Ω
R4, R5 (k
Ω
)
0
75
113
150
187
221
261
301
332
442
464
523
715
1000
* For the 0.6V output, R7 and R8 are open.
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