Over Voltage Protection IC Datasheet

© 2024 Littelfuse, Inc.

Specifications are subject to change without notice.

Revised: GD. 06/13/24

LS0504EVT233

5V, 4A eFuse with Over Voltage and Over Current Protection

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Detailed Description

The LS0504EVT233 is a fully integrated load switch with built-in over-voltage protection, internal soft-start, and current limit. When the

input voltage is within the valid range (2.7V ~28V), the output pin OUT will ramp up with a fixed slew rate defined by an internal soft start.

After OUT ramps up to the input level, the internal load switch is fully turned on and ready to supply power to the system. LS0504EVT233

continuously monitors the system load current through the switch when powering on. Once the load current reaches the current limit,

LS0504EVT233 will regulate the load current for 60µs to prevent the load current from running away. After 60µs, if the current limit

condition sustains, LS0504EVT233 will turn off the load switch, wait for 8ms and then try to restart. In the event of system short circuit

failure, the load current could jump significantly higher than the current limit. Whenever the load current is 2A larger than the current limit

level, LS0504EVT233 immediately turns off the load switch to prevent a disastrous outcome, then also for 8ms before it tries to restart.

LS0504EVT233 has an internal input OVP to protect the system from being stressed by excessively high voltage. Once it detects input

voltage is higher than the built-in over-voltage threshold, LS0504EVT233 immediately turns off the load switch. The load switch will be

automatically turned on once the input voltage falls within the valid range. The LS0504EVT233 also has thermal shutdown protection;

when device temperature (T

J) exceeds TSHDN, typically 160°C, the thermal shutdown circuitry will shut down the internal MOSFET, thereby

disconnecting the load from the input supply. The LS0504EVT233 will remain off during a cooling period until the device temperature falls

below T

SHDN - 40°C, after which it will attempt to restart.

Input and Output Capacitor Selection

The LS0504EVT233 require ≥1μF input and output capacitor connected to GND. X7R type capacitors are recommended, but X5R and

others may be used.

PCB Layout Guideline

■ For all applications, a 0.1µF or greater ceramic decoupling capacitor is recommended between IN terminal and GND, and a 0.1µF or

greater ceramic decoupling capacitor is recommended between OUT terminal and GDN. For hot-plug applications, where input power path

inductance is negligible, this capacitor can be eliminated/minimized.

■ The optimum placement of decoupling capacitor is closest to the IN and GND terminals of the device. Care must be taken to minimize the

loop area formed by the bypass-capacitor connection, the IN terminal, and the GND terminal of the IC.

■ High current carrying power path connections should be as short as possible and should be sized to carry at least twice the full-load

current.

■ The GND terminal must be tied to the PCB ground plane at the terminal of the IC. The PCB ground should be a copper plane or island on

the board.

■ Obtaining acceptable performance with alternate layout schemes is possible; however, this layout has been shown to produce good results

and is intended as a guideline.