AME8802LEEVZ datasheet(8/16 Pages) AME

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AME

300mA CMOS LDO

AME8802

Rev.K.02

The AME8802 family of CMOS regulators contain a

PMOS pass transistor, voltage reference, error amplifier,

over-current protection, thermal shutdown, and power

good function.

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 below 120oC.

The AME8802 switches from voltage mode to current

mode when the load exceeds the rated output current.

This prevents over-stress. The AME8802 also incorpo-

rates current foldback to reduce power dissipation when

the output is short circuited. This feature becomes ac-

tive when the output drops below 0.8volts, and reduces

the current flow by 65%. Full current is restored when

the voltage exceeds 0.8 volts.

The Enable pin normally floats high. When actively,

pulled low, the PMOS pass transistor shuts off, and all

internal circuits are powered down. In this state, the qui-

escent current is less than 1

µA. This pin behaves much

like an electronic switch.

n Detailed Description

n External Capacitors

n Enable

n Power Good

The AME8802 includes the Power Good feature. When

the output is not within +15% 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.)

The AME8802 is stable with an output capacitor to

ground of 2.2

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.

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