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
10μF
GND
V
OUT
V
IN
: 1.8V~5.5V
6V
TVS
Diode
*Optional
220μF
C
IN
LS0504E
10μF
C
EN
0.1μFNC
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.
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
Absolute Maximum Rating (Reference to GND)
* Notes: Stress exceeding those listed “Absolute Maximum Ratings” may damage the device.
Symbol Value Units
All Pins -0.3 to +6 V
IN to OUT -0.3 to +6 V
ESD Class 2
Junction Temperature Range -40 to +150 °C
Storage Temperature Range -65 to +150 °C
Lead Temperature (Soldering 10s) 260 °C
Recommend Operating Conditions
Symbol Value Units
Input Voltage (V
IN
) +1.8 to 5.5 V
Junction Temperature Range <135 °C
* Notes: The device is not guaranteed to function outside of the recommended operating conditions.
Note1: Measured on JESD51-7, 4-Layer PCB.
Note 2: The maximum allowable power dissipation is a function of the maximum junction temperature T
J_MAX
,
the junction to ambient thermal resistance θ
JA
, and the ambient temperature TA. The maximum allowable
continuous power dissipation at any ambient temperature is calculated by P
D_MAX
= (T
J_MAX
-T
A
)/θ
JA
. Exceeding
the maximum allowable power dissipation will cause excessive die temperature, and the regulator will go into
thermal shutdown. Internal thermal shutdown circuitry protects the device from permanent damage.
Thermal information
Parameter Test Conditions Min TYP Max Unit
Input-Supply Voltage Range 1. 8 5.5 V
Shutdown Current V
EN
=0V 0.01 1 µA
Quiescent Supply Current V
EN
=2V, I
LOAD
=0mA 35 50 µA
Input Under-Voltage Lockout Threshold
Rising
V
IN
ramp up 1.65 V
Input Under-Voltage Lockout Threshold
Hysteresis
V
IN
ramp down 0.15 V
Input Over-voltage Protection Rising
Threshold
V
IN
ramp up 6.3 V
Input Over-voltage Protection Hysteresis V
IN
ramp down 0.3 V
EN ON Threshold EN Rising 1. 14 1.20 1.26 V
EN ON Threshold Hysteresis EN Falling 0.1 V
EN OFF Threshold Shutdown current <1µA 0.4 V
Load Switch FET On Resistance R
ON
26 mΩ
Load Switch Current Limit 4.5 A
Output Discharge Resistance V
IN
=5V, V
EN
=0V, V
OUT
=0.3V 8 Ω
Load Switch soft-start time V
IN
=5V, Iload=500mA 250 µs
Thermal Shutdown 140 ˚C
Thermal Shutdown Hysteresis 45 ˚C
Electrical Characteristics (T
A
= +25°C, V
IN
=5V, V
EN
=2V, unless otherwise specified)
Symbol Value Units
Maximum Power Dissipation (T
A
=25°C ) 0.5 W
Thermal Resistance (θ
JA
)
200 °C/W
Thermal Resistance (θ
JC
)
70 °C/W