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AME8822AEET260Z 数据表(PDF) 10 Page - Analog Microelectronics

部件名 AME8822AEET260Z
功能描述  High PSRR, 250mA CMOS LDO
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制造商  AME [Analog Microelectronics]
网页  http://www.ame.com.tw/
标志 AME - Analog Microelectronics

AME8822AEET260Z 数据表(HTML) 10 Page - Analog Microelectronics

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AME
10
High PSRR, 250mA CMOS LDO
AME8822
Rev.F.04
The AME8822 is stable with an output capacitor to
ground of 1
μF or larger. Ceramic capacitors have the low-
est ESR, and will offer the best AC performance. Con-
versely, Aluminum Electrolytic capacitors exhibit the high-
est ESR, resulting in the poorest AC response.
A second capacitor is recommended between the in-
put and ground to stabilize V
IN. The input capacitor should
be at least 1
μF to have a beneficial effect.
Detailed Description
External Capacitors
Enable
The Enable Pin is normally pull-high. When activated
pulled low, the PMOS pass transistor shuts off, and all
internal circuits are powered down. In this state, the stand
by current is less than 1
μA. This pin can’ t be floating.
The AME8822 family of CMOS regulators contain a
PMOS pass transistor, voltage reference, error amplifier,
over-current protection, and thermal shutdown.
The P-channel pass transistor receives data from the
error amplifier, over-current shutdown, and thermal pro-
tection circuits. During normal operation, the error ampli-
fier compares the output voltage to a precision reference.
Over-current and thermal shutdown circuits become ac-
tive when the junction temperature exceeds 150oC, or
the current exceeds 250mA. During thermal shutdown,
the output voltage remains low. Normal operation is re-
stored when the junction temperature drops below 130oC.
The AME8822 switches from voltage mode to current
mode when the load exceeds the rated output current.
This prevents over-stress.


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