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AME8852-AEU090K Datasheet(PDF) 9 Page - Analog Microelectronics

Part # AME8852-AEU090K
Description  High PSRR, Low Noise, 150mA CMOS Regulator
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Manufacturer  AME [Analog Microelectronics]
Direct Link  http://www.ame.com.tw/
Logo AME - Analog Microelectronics

AME8852-AEU090K Datasheet(HTML) 9 Page - Analog Microelectronics

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AME
9
AME8852
Rev. B.01
High PSRR, LowNoise, 150mA
CMOS Regulator
The AME8852 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 150mA. 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 AME8852 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.
Conversely, Aluminum Electrolytic capacitors exhibit the
highest ESR, resulting in the poorest AC response. Un-
fortunately, large value ceramic capacitors are compara-
tively expensive. One option is to parallel a 0.1
µF ce-
ramic 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 Active High. When activated pulled
low, the MOS pass transistor shuts off, and all internal
circuits are powered down. In this state, the stand by
current is than 1
µA. When ENpin float outside, It's pulled
high.
n
Detailed Description
Capacitor Selection and Regulator Stability
The maximum output power of the AME8852 is limited
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 = (VIN(MAX)-VOUT) x IOUT
Where:
V
IN(MAX) = maximum input voltage
P
MAX = maximum power dissipation of the package


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