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AME8853AAEU100K Datasheet(PDF) 10 Page - Analog Microelectronics

Part # AME8853AAEU100K
Description  High PSRR, Low Noise, 300mA CMOS Regulator
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Manufacturer  AME [Analog Microelectronics]
Direct Link  http://www.ame.com.tw/
Logo AME - Analog Microelectronics

AME8853AAEU100K Datasheet(HTML) 10 Page - Analog Microelectronics

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AME
10
High PSRR, Low Noise, 300mA
CMOS Regulator
AME8853A
Rev.C.01
The AME8853A family of CMOS regulators contain a
PMOS pass transistor, voltage reference, error amplifier,
over-current protection thermal shutdown, and Power Good
detection circuitry.
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 300mA. During thermal shutdown,
the output voltage remains low. Normal operation is re-
stored when the junction temperature drops more 20oC.
Capacitor Selection and Regulator Stability
The AME8853A is stable with an output capacitor to
ground of 1
µF or greater. Ceramic capacitors have the
lowest ESR, and will offer the best AC performance. Con-
versely, Aluminum Electrolytic capacitors exhibit the high-
est ESR, resulting in the poorest AC response. Unfortu-
nately, large value ceramic capacitors are comparatively
expensive. One option is to parallel a 0.1
µF ceramic
capacitor with a 10
µF Aluminum Electrolytic. The benefit
is low ESR, high capacitance, and low overall cost.
A second capacitor is recommended between the in-
put and ground to stabilize V
IN. The input capacitor should
be at least 0.1
µF to have a beneficial effect.
Enable Pin
The Enable Pin is pull-low. When activated pulled low,
the MOS pass transistor shuts off, and all internal cir-
cuits are powered down. In this state, the stand by cur-
rent is less than 1
µA.
n Detailed Description
Capacitor Selection and Regulator Stability
The maximum output power of the AME8853A is lim-
ited by the maximum power dissipation of the package.
By calculation the power dissipation of the package as a
function of the input voltage, output voltage and output
current, the maximum input voltage can be obtained. The
maximum power dissipation should not exceed the
package
’s maximum power rating.
P
MAX = (V IN(MAX) -VOUT) x IOUT
Where:
V
IN(MAX) = maximum input voltage
P
MAX = maximum power dissipation of the package


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