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AME8818 Datasheet(PDF) 8 Page - AMETHERM Circuit Protection Thermistors

Part # AME8818
Description  Low Dropout 300mA CMOS Regulator
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Manufacturer  AMETHERM [AMETHERM Circuit Protection Thermistors]
Direct Link  http://www.ametherm.com
Logo AMETHERM - AMETHERM Circuit Protection Thermistors

AME8818 Datasheet(HTML) 8 Page - AMETHERM Circuit Protection Thermistors

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AME
AME8818
Low Dropout
300mA CMOS Regulator
8
Rev.A.01
n Detailed Description
n Circuit Limit
n Shutdown Mode
n Capacitor Selection and
Regulator Stability
n Thermal-Overload Protection
n PSRR and Operation from
sources Other than Batteries
Thermal-overload protection limits total power dissipation
in the AME8818. When the junction temperature arrive T
J =
160oC approximately, the thermal sensor signals the shut-
down logic, turning off the pass transistor and allowing the IC
to cool.
Use a 1
µF capacitor on the AME8818 input and a
1
µF capacitor on the OUT. Larger input capacitor val-
ues and lower ESR provide better supply noise rejec-
tion and line transient response. To reduce output
noise and improve load transient voltage dips, use
larger output capacitors up to 4.7
µF. For stable op-
eration over the full temperature range with load cur-
rents up to 300mA, input and output capacitors should
be a minimum of 1
µF by X7R.
Note that some ceramic dielectrics large capacitance
and ESR variation with temperature. With dielectrics
such as Z5U and Y5V, it may be necessary to use
2.2
µF or more for up to 300mA load current to ensure
stability at temperatures below -10oC. With X7R or
X5R dielectrics, 1
µF is sufficient at all operating tem-
peratures. These regulators are optimized for ceramic
capacitors. Tantalum capacitors are not recommended.
Bypass capacitor can be in between 0.1
µF~0.001µF.
A larger capacitor improves AC ripple rejection, but
also make the output come up slowly.
The AME8818 is low-dropout, low quiescent-current linear
regulator designed primarily for battery-powered applications.
It is available with present output voltage ranging from 1.2V
to 4.5V, and can supply loads up to 300mA.
The AME8818 has enable-control-pin. Drive EN low to shut-
down OUT. Drive EN to shutdown the entire chip, reducing
supply current to 5
µA. Connected EN to logic-high or IN for
normal operation.
The AME8818 contains current limiters which monitor and
control the pass transistor's Gate voltage, limiting the guar-
anteed maximum output current to 330mA minimum. The
output can be shorted to ground for an indefinite time without
damaging the part.
The AME8818 is designed to deliver low-dropout
voltage and low quiescent currents in battery-powered
system. Power-supply rejection ratio is 60dB (Typ.)
at 1KHz. When operating from sources other than
betteries, PSRR and transient response can be im-
proved by increasing input, output and bypass
capacitors(see PSRR vs Frequency Curve).


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