Protection IC Datasheet

© 2022 Littelfuse, Inc.

Specifications are subject to change without notice.

Revised: FW.12/01/22

LS0504EDD12

5.5V 4A Low-Ron Power Distribution Load Switch

The LS0504EDD12 is a compact, low R

ON load switch with

controlled slew rate. The device operates over an input voltage

range of 1.8V to 5.5V and can support maximum continuous

current of 4A.

The controlled output slew rate greatly reduces inrush current at

start-up when charging large bulk load capacitances, thereby

minimizes input supply voltage droop. LS0504E comes with built-

in full protections against over current, over voltage and over

temperature. It provides an accurate enable threshold which allows

users to program input under-voltage lockout (UVLO) threshold

through external resistor divider network. It has built-in 8Ω resistor

for quick output discharge at disable.

Features

RoHS Pb

Pinout Designation

Description

Applications

OUT

EN

GND

IN

1

2

3

4

■ Wide Input Range from 1.8V

to 5.5V

■ Low R

ON at 26mΩ

■ Up to 4A continuous current

■ Built-in Over-Voltage,

Over-Current and Over

Temperature Fault

Protections

■ 250µs internal Soft-start for

5V output

■ Accurate 1.2V Enable

Threshold

■ Quick Output Discharge in

Shutdown

■ Solid-state Drives

■ Wearable IOT Devices

■ Portable Medical

Equipment

■ Portable Media Players

■ Smartphones and Tablets

IN

EN

OUT

C

O

10F

GND

V

OUT

V

IN : 1.8V~5.5V

6V

TVS

Diode

*Optional

220F

C

IN

LS0504E

10F

C

EN

0.1 F

NC

R

EN2

R

EN1

+

10K

*Optional

Typical Applications

OVP

UVLO

Charge

Pump

IN

EN

GND

Thermal

Detect

Current

Limit

Driver

OUT

Discharge

Control

8Ω

Functional Block Diagram

Pin

Name

Pin #

Description

GND

1

Ground pin.

EN

2

Enable pin. EN has accurate 1.20V ON threshold.

Pull EN pin above ON threshold enables the

LS0504E. Pull EN pin below 0.4V disables the

LS0504EDD12.

IN

3

Input pin. Connect a 10µF or greater ceramic

capacitor from IN to GND close to the IC

OUT

4

Output pin. Connect a 10µF or greater ceramic

capacitor from OUT to GND close to the IC

Pin Description

*USB Port Connection

When the input of LS0504E is connected to a USB port, recommend to add either a 6V Rating TVS diode

or a 220μF Aluminum Cap to absorb input surge current during USB cable hot plug-in.