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參數(shù)資料
| 型號： | AAT3218IJS-1.25-T1 |
| 廠商： | Advanced Analog Technology,lnc. |
| 英文描述： | 150mA MicroPower⑩ High Performance LDO |
| 中文描述： | 150mA的微功耗高性能的LDO⑩ |
| 文件頁數(shù)： | 9/18頁 |
| 文件大小： | 384K |
| 代理商： | AAT3218IJS-1.25-T1 |
Applications Information
To assure the maximum possible performance is
obtained from the AAT3218, 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 AAT3218 is physically located more
than three 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 capac-
itors 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 AAT3218 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 AAT3218 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.
Bypass Capacitor and Low Noise
Applications
A bypass capacitor pin is provided to enhance the
low noise characteristics of the AAT3218 LDO regu-
lator. The bypass capacitor is not necessary for
operation of the AAT3218. However, for best device
performance, a small ceramic capacitor should be
placed between the bypass pin (BYP) and the device
ground pin (GND). The value of C
BYP
may range
from 470pF to 10nF. For lowest noise and best pos-
sible power supply ripple rejection performance, a
10nF capacitor should be used. To practically realize
the highest power supply ripple rejection and lowest
output noise performance, it is critical that the capac-
itor connection between the BYPpin and GND pin be
direct and PCB traces should be as short as possi-
ble. Refer to the PCB Layout Recommendations
section of this datasheet for examples.
There is a relationship between the bypass capac-
itor value and the LDO regulator turn-on time and
turn-off time. In applications where fast device
turn-on and turn-off time are desired, the value of
C
BYP
should be reduced.
In applications where low noise performance and/
or ripple rejection are less of a concern, the bypass
capacitor may be omitted. The fastest device turn-
on time will be realized when no bypass capacitor
is used.
DC leakage on this pin can affect the LDO regula-
tor output noise and voltage regulation perform-
ance. For this reason, the use of a low leakage,
high quality ceramic (NPO or C0G type) or film
capacitor is highly recommended.
Capacitor Characteristics
Ceramic composition capacitors are highly recom-
mended over all other types of capacitors for use
with the AAT3218. Ceramic capacitors offer many
advantages over their tantalum and aluminum elec-
trolytic counterparts. A ceramic capacitor typically
AAT3218
150mA MicroPower High Performance LDO
3218.2006.04.1.8
9
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| AAT3218IJS-2.3-T1 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:150mA MicroPower⑩ High Performance LDO |
| AAT3218IJS-2.5-T1 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:150mA MicroPower⑩ High Performance LDO |
| AAT3218IJS-2.6-T1 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:150mA MicroPower⑩ High Performance LDO |
| AAT3218IJS-2.7-T1 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:150mA MicroPower⑩ High Performance LDO |
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