APL3538 datasheet(9/16 Pages) ANPEC

Part #	APL3538

Description	Ultra-LowOn-Resistance, 6A Dual Load Switch with Soft Start

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Manufacturer	ANPEC [Anpec Electronics Coropration]

Direct Link	http://www.anpec.com.tw

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Rev. P.1 - Sep, 2015

www.anpec.com.tw

9

APL3538

Preliminary

Function Description

Under-voltage Lockout (UVLO)

Power Switch

The power switch is an N-channel MOSFET with a ultra-

low R

DS(ON). W hen IC is in shutdown state (VEN1,2=Low or

V

ENB1,2=High), the MOSFET prevents a reverse current flow-

ing from the VOUT back to VIN. When IC is in UVLO state,

the internal parasitic diodes connected from VOUT to VIN

will be forward biased.

A Under-Voltage Lockout (UVLO) circuit monitors the VDD

pins voltage to prevent wrong logic controls. The UVLO

function initiates a soft-start process after the VDD supply

voltages exceed rising UVLO voltage threshold during

powering on.

Over-Current Protection (OCP)

When the output current reaches the OCP threshold, the

device is turned off and the output is latched to be floating

until ENx or ENBx is toggled.

Soft-Start

The APL3538 provides an adjustable soft-start circuitry to

control rise rate of the output voltage and limit the current

surge (I

SURGE,Max<7.5A) during start-up. The soft-start time

is set with a capacitor from the SSx pin to the ground.

The APL3538 power switch provides the OCP function.

Enable Control

The APL3538 has a dedicated enable pin (ENx or ENBx).

A logic low/high signal applied to this pin shuts down the

output. Following a shutdown, a logic high/low signal re-

enables the output through initiation of a new soft-start

cycle.

Over-Temperature Protection

When the junction temperature exceeds 150°C, the inter-

nal thermal sense circuit turns off the power FET and

allows the device to cool down. When the device

’s junc-

tion temperature cools by 30°C, the internal thermal sense

circuit will enable the device, resulting in a pulsed output

during continuous thermal protection. Thermal protec-

tion is designed to protect the IC in the event of over tem-

perature conditions. For normal operation, the junction

temperature cannot exceed TJ=+125°C.

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