參數(shù)資料
型號(hào)： AAT3216IJS-2.8-T1
廠商： Electronic Theatre Controls, Inc.
元件分類： 基準(zhǔn)電壓源/電流源
英文描述： 150mA MicroPower⑩ LDO with PowerOK
中文描述： ⑩微功耗150mA的LDO穩(wěn)壓器與PowerOK
文件頁(yè)數(shù)： 9/16頁(yè)
文件大?。?/td> 232K
代理商： AAT3216IJS-2.8-T1
Applications Information
To assure the maximum possible performance is
obtained from the AAT3216, please refer to the fol-
lowing application recommendations.
Input Capacitor
Typically a 1μF or larger capacitor is recommend-
ed for C
IN
in most applications. A C
IN
capacitor is
not required for basic LDO regulator operation.
However, if the AAT3216 is physically located more
than 3 centimeters from an input power source, a
C
IN
capacitor will be needed for stable operation.
C
IN
should be located as close to the device V
IN
pin
as practically possible. C
IN
values greater than
1μF will offer superior input line transient response
and will assist in maximizing the highest possible
power supply ripple rejection.
Ceramic, tantalum or aluminum electrolytic capaci-
tors may be selected for C
IN
. There is no specific
capacitor ESR requirement for C
IN
. However, for
150mA LDO regulator output operation, ceramic
capacitors are recommended for C
IN
due to their
inherent capability over tantalum capacitors to with-
stand input current surges from low impedance
sources such as batteries in portable devices.
Output Capacitor
For proper load voltage regulation and operational
stability, a capacitor is required between pins V
OUT
and GND. The C
OUT
capacitor connection to
the LDO regulator ground pin should be made as
direct as practically possible for maximum device
performance.
The AAT3216 has been specifically designed to func-
tion with very low ESR ceramic capacitors. For best
performance, ceramic capacitors are recommended.
Typical output capacitor values for maximum output
current conditions range from 1μF to 10μF.
Applications utilizing the exceptionally low output
noise and optimum power supply ripple rejection
characteristics of the AAT3216 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 then 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 AAT3216. 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):
ESR is a
very important characteristic to consider when
selecting a capacitor. ESR is the internal series
resistance associated with a capacitor, which
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:
tors less than 0.1μF are typically made from NPO
or COG materials. NPO and COG materials are
typically tight tolerance very stable over tempera-
ture. Larger capacitor values are typically com-
posed of X7R, X5R, Z5U and Y5V dielectric mate-
rials. Large ceramic capacitors, typically greater
then 2.2μF are often available in the low cost Y5V
and Z5U dielectrics. 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. A2.2μF 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 dielectric is better than ±15%.
Ceramic capaci-
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 material and capacitance
value. These larger devices can improve circuit tran-
sient response when compared to an equal value
capacitor in a smaller package size.
AAT3216
150mA MicroPower LDO with PowerOK
3216.2004.01.0.94
9
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