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APL5320

Ultra-Low-Noise, High PSRR, Low-Dropout, 300mA Linear Regulator

Anpec Electronics 

APL5320

Function Description

Internal Soft-Start

An internal soft-start function controls rising rate of the

output voltage to limit the surge current at start-up. The

typical soft-start interval is about 60µs.

Thermal Shutdown

A thermal shutdown circuit limits the junction tempera-

ture of APL5320. When the junction temperature exceeds

+160oC, 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 cools by 40oC.The thermal

shutdown is designed with a 40oC hysteresis to lower

the average junction temperature during continuous ther-

mal overload conditions, extending lifetime of the device.

For normal operation, device power dissipation should

be externally limited so that junction temperature will not

exceed 125oC.

Current-Limit with Current Foldback

The APL5320 monitors the current via the output PMOS

and limits the maximum current. When the output current

reaches the current-limit threshold, current-limit with cur-

rent foldback circuit starts to work to prevent load and

APL5320 from damages during overload or short-circuit

conditions. Typical foldback current is about 50mA.

Shutdown Control

The APL5320 has an active-low shutdown function. Forc-

ing SHDN high (>1.5V) enables the VOUT; forcing SHDN

low (<0.4V) disables the V . The SHDN can not be left

OUT

floating. If it is not used, connect it to VIN for normal

operation.

Under-Voltage Lock Out (UVLO)

The APL5320 monitors the input voltage to prevent wrong

logic control. The UVLO function initiates a soft-start pro-

cess after input voltage exceeds its rising UVLO thresh-

old during power on. The UVLO function also shuts off

the output when the input voltage falls below it’s falling

threshold.

Copyright © ANPEC Electronics Corp.

11

Rev. A.9 - Mar., 2012

www.anpec.com.tw

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