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APE8805A

Shutdown Pin Voltage (ON)

1.4

V

Shutdown Pin Voltage (OFF)

0.4

V

Shutdown Exit Delay Time

∆T

300

µs

Note 2：Regulation is measured at a constant junction temperature by using 40ms current pulse and load regulation in the load range from

0mA to 600mA.

Application Information

The

APE8805A is a low dropout linear regulator that

could provide 600mA output current at dropout volt-

age about 600mV. Current limit and on chip thermal

shutdown features provide protection against any

combination of overload or ambient temperature that

could exceed maximum junction temperature.

1. Output and Input Capacitor

The

APE8805A regulator is designed to be stable

with a wide range of output capacitors. The ESR

of the output capacitor affects stability. Larger

value of the output capacitor decreases the peak

deviations and improves transient response for

larger current changes.

The capacitor types (aluminum, ceramic, and tant-

alum) have different characterizations such as

temperature and voltage coefficients. All ceramic

capacitors are manufactured with a variety of

dielectrics, each with different behavior across

temperature and applications. Common dielectrics

used are X5R, X7R and Y5V. It is recommended

to use 1uF to 10uF X5R or X7R dielectric ceramic

capacitors with 30m

Ω to 50mΩ ESR range betw-

een device outputs and ground for stability. The

APE8805A is designed to be stable with low ESR

ceramic capacitors and higher values of ca-

pacitors and ESR could improve output stability.

The ESR of output capacitor is very important

because it generates a zero to provide phase lead

for loop stability.

There are no requirements for the ESR on the

input capacitor, but its voltage and temperature

coefficient have to be considered for device

application environment.

2. Protection Features

In order to prevent overloading or thermal con-

dition from damaging the device,

APE8805A has

internal thermal and current limiting functions

designed to protect the device. It will rapidly

shut off PMOS pass element during overload-

ing or over temperature condition.

3. Thermal Consideration

The power handling capability of the device will

be limited by maximum operation junction

temperature. The power dissipated by the

device will be estimated by PD = IOUT

×

(VIN-VOUT). The power dissipation should be

lower than the maximum power dissipation

listed in “Absolute Maximum Ratings” section.

4. Shutdown Operation

The

input should be tied to VIN to keep the regu-

left floating).

Advanced Power

Electronics Corp.