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AME8844 Datasheet(PDF) 7 Page - Analog Microelectronics

Part No. AME8844
Description  750mA CMOS LDO
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Maker  AME [Analog Microelectronics]
Homepage  http://www.ame.com.tw/
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AME8844 Datasheet(HTML) 7 Page - Analog Microelectronics

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AME, Inc.
7
AME8844
750mA CMOS LDO
Rev.E.01
The AME8844 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 140oC, or
the current exceeds 2.2A. During thermal shutdown, the
output voltage remains low. Normal operation is restored
when the junction temperature drops below 120oC.
The AME8844 behaves like a current source when the
load reaches 2.2A. However, if the load impedance drops
below 0.3 ohms, the current drops back to 600mA to
prevent excessive power dissipation. Normal operation
is restored when the load resistance exceeds 0.75 ohms.
n Detailed Description
n External Capacitors
The AME8844 is stable with an output capacitor to
ground of 4.7
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 Vin. The input capacitor should
be at least 0.1
µF to have a beneficial effect.
All capacitors should be placed in close proximity to
the pins. A "Quiet" ground termination is desirable. This
can be achieved with a "Star" connection.
n Enable
When EN pin is pulled low, the PMOS pass transistor
shuts off, and all internal circuits are powered down. In
this state, the quiescent current is less than 2
µA. This
pin behaves much like an electronic switch.
100K ohms resistor is necessary between V
EN source
and EN pin when V
EN is higher than VIN.
n Adjustable Version
The adjustable version uses external feedback resis-
tors to generate an output voltage anywhere from 1.5V to
5.0V. Vadj is trimmed to 1.24V and VOUT is given by the
equation:
VOUT = Vadj ( 1 + R1 / R2 )
Feedback resistors R1 and R2 should be high enough
to keep quiescent current low, but increasing R1 + R2
will reduce stability. In general, R1 and R2 in the 10
of
s
k
Ω will produce adequate stability, given reasonable lay-
out precautions. To improve stability characteristics, keep
parasitics on the ADJ pin to a minimum, and lower R1
and R2 values.
n Power Good
The AME8844 includes the Power Good feature. When
the output is not within ? 5% of the specified voltage, it
pulls low. This can occur under the following conditions:
1) Input Voltage too low.
2) During Over-Temperature.
3) During Over-Current.
4) If output is pulled up.
(Note: PG pin is an open-drain output.)
(Note: There is no internal pull-up for EN pin.
It can not be floating)


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