APL5327 datasheet(8/14 Pages) ANPEC

8 / 14 page

Rev. A.2 - Jun., 2011

APL5327

www.anpec.com.tw

Function Description

Where R1 is connected from VOUT to SET with Kelvin

sensing and R2 is connected from SET to GND. The rec-

ommended value of R2 is in the range of 100 to100k

Ω.

An error amplifier works with a temperature compensated

1.2V reference and an output PMOS regulates the output

to the presetting voltage. The error amplifier is designed

with high bandwidth and DC gain provides very fast tran-

sient response and less load regulation. It compares the

reference with the feedback voltage and amplifies the dif-

ference to drive the output PMOS which provides load

current from VIN to VOUT.

Output Voltage Regulation

The APL5327 is an adjustable low dropout linear

regulator. The output voltage set by the resistor-divider is

determined by:

Thermal Shutdown

A thermal shutdown circuit limits the junction tempera-

ture of APL5327. When the junction temperature exceeds

+160οC, a thermal sensor turns off the output PMOS, al-

lowing the device to cool down. The regulator regulates

the output again through initiation of a new soft-start cycle

after the junction temperature is cooled down by 40oC.

The thermal shutdown is designed with a 40oC hyster-

esis to lower the average junction temperature during

continuous thermal overload conditions, extending life-

time of the device.

For normal operation, device power dissipation should

be externally limited so that junction temperature will not

exceed 125oC.

Shutdown Control

The APL5327 has an active-low shutdown function. Force

SHDN high (>1.6V) enables the V

OUT; force SHDN low

(<0.4V) disables the V

OUT. SHDN is internally pulled low

by a resistor (3m

Ω typical). If it is not used, connect to VIN

for normal operation.







 +

⋅

1.2

VOUT

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