APL5323 データシートの表示（PDF） - Anpec Electronics
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APL5323 Datasheet PDF : 15 Pages
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APL5323
Function Description
Output Voltage Regulation
The APL5323 is an adjustable low dropout linear
regulator. The output voltage set by the resistor-divider is
determined by:
VOUT
= 1.25
⋅
1+
R1
R2
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 100Ω to100kΩ.
An error amplifier works with a temperature compensated
1.25V reference and an output PMOS regulates the out-
put to the presetting voltage. The error amplifier is de-
signed with high bandwidth and DC gain provides very
fast transient response and less load regulation. It com-
pares the reference with the feedback voltage and ampli-
fies the difference to drive the output PMOS which pro-
vides load current from VIN to VOUT.
Thermal Shutdown
A thermal shutdown circuit limits the junction tempera-
ture of APL5323. 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 APL5323 has an active-low shutdown function. Force
SHDN high (>1.6V) enables the V ; force SHDN low
OUT
(<0.4V) disables the V . SHDN is internally pulled low
OUT
by a resistor (3mΩ typical). If it is not used, connect to VIN
for normal operation.
Copyright © ANPEC Electronics Corp.
8
Rev. A.2 - Jul., 2010
www.anpec.com.tw
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