LP5245
High current load switch with 4A capability and 35mΩ on-resistance for power hungry applications
Product Overview
Description
The LP5265 is a high current load switch designed for power-hungry applications requiring high current capability with minimal voltage drop. It can support continuous currents up to 4A with low 35mΩ on-resistance.
The device operates from 2.5V to 5.5V input voltage range. The active-high enable pin allows software control of the power rail. The fast turn-on time of 150μs enables quick power delivery to high-performance subsystems.
The LP5245 includes comprehensive protection features: thermal shutdown, reverse current blocking, and under-voltage lockout. The exposed-pad DFN-8 package provides excellent thermal performance for high-current operation. It is ideal for powering application processors, motor drivers, and high-power sensors.
Product Series
LP
Primary Application
Application processor power
Key Features
- High 4A current capability
- Low 35mΩ on-resistance
- 2.5V to 5.5V input range
- Active-high enable pin
- Fast 150μs turn-on time
- 2μA disabled current
- Thermal shutdown protection
- Exposed pad DFN-8 package
Specifications
| Input Voltage Range | 2.5V - 5.5V |
|---|---|
| Current Rating | 4A continuous |
| On-Resistance | 35mΩ typical |
| Quiescent Current | 2μA (disabled) |
| Turn-On Time | 150μs typical |
| Turn-Off Time | 15μs typical |
| Enable Threshold | 1.2V typical |
| Thermal Shutdown | 150°C |
| Operating Temperature | -40°C to +85°C |
| Package | DFN-8 (3mm x 3mm) EP |
Applications
Application processor power
Electronic system design
Motor driver supply
Motor drive and control systems
High-power sensors
Sensor signal conditioning
Power amplifier supply
Electronic system design
High-current subsystems
Electronic system design
FAE Expert Insights
"The LP5245 is my recommendation for high current load switching applications. The 4A capability with 35mΩ on-resistance means only 140mV drop at full current - excellent for maintaining voltage to power-hungry loads. I've used this switch for application processors, motor drivers, and RF power amplifiers. The exposed pad DFN package is essential for thermal management - at 4A with 35mΩ, the power dissipation is 560mW, which requires good heat sinking. One implementation tip: solder the exposed pad to a large copper pour with multiple thermal vias to inner ground planes. I've seen the thermal shutdown activate when the pad wasn't properly soldered. The enable pin has hysteresis to prevent chatter. The 150μs turn-on time is reasonable for most applications. Overall, a high-performance load switch for demanding applications."
High current load switch with 4A capability and low 35mΩ on-resistance
— Dr. Liu Ming, BeiLuo
Frequently Asked Questions
What is the maximum current for LP5245?
The LP5245 can support continuous currents up to 4A. At this current level, proper thermal management is critical. The exposed pad must be soldered to a large copper area with thermal vias to dissipate the heat generated (P = I² × R = 4A² × 35mΩ = 560mW).
4A maximum current; requires proper thermal management with exposed pad soldered to copper pour.