ame8800aeft AME, Inc., ame8800aeft Datasheet - Page 24

• Manufacturer Part Number: ame8800aeft
• Description: 300ma Cmos Ldo
• Manufacturer: AME, Inc.

n Detailed Description
a PMOS pass transistor, voltage reference, error ampli-
fier, over-current protection, and thermal shutdown.
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 150
the current exceeds 300mA. During thermal shutdown,
the output voltage remains low. Normal operation is re-
stored when the junction temperature drops below 120
rent mode when the load exceeds the rated output cur-
rent. This prevents over-stress. The AME8800/8811 also
incorporates current foldback to reduce power dissipa-
tion when the output is short circuited. This feature be-
comes active when the output drops below 0.8 volts, and
reduces the current flow by 65%. Full current is restored
when the voltage exceeds 0.8 volts.
24
AME8800 / 8811
The AME8800/8811 family of CMOS regulators contain
The P-channel pass transistor receives data from the
The AME8800/8811 switches from voltage mode to cur-
AME, Inc.
o
C, or
o
C.
n External Capacitors
to ground of 2.2 F 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 F ce-
ramic capacitor with a 10 F Aluminum Electrolytic. The
benefit is low ESR, high capacitance, and low overall cost.
put and ground to stabilize V
be at least 0.1 F to have a beneficial effect.
the pins. A "Quiet" ground termination is desirable. This
can be achieved with a "Star" connection.
The AME8800/8811 is stable with an output capacitor
A second capacitor is recommended between the in-
All capacitors should be placed in close proximity to
300mA CMOS LDO
IN
. The input capacitor should
Rev.T.04