LP5240
Low on-resistance load switch with enable control for power distribution applications
Product Overview
Description
The LP5240 is a low on-resistance load switch designed for power distribution and power sequencing applications. It features an N-channel MOSFET with typical on-resistance of 60mΩ, minimizing voltage drop and power loss even at high currents.
The device operates from 1.8V to 5.5V input voltage and can support continuous currents up to 2A. The active-high enable pin allows software control of power rails, making it ideal for power sequencing in multi-rail systems and for turning off unused circuits to save power.
The LP5240 includes thermal shutdown protection and reverse current blocking. The fast turn-on and turn-off times (microseconds) enable quick power switching. Available in a compact SOT-23-5 package, it is perfect for space-constrained portable electronics and IoT devices.
Product Series
LP
Primary Application
Power distribution
Key Features
- Low 60mΩ on-resistance
- 2A continuous current capability
- 1.8V to 5.5V input voltage range
- Active-high enable pin
- Fast 100μs turn-on time
- Ultra-low 0.5μA disabled current
- Thermal shutdown protection
- Reverse current blocking
Specifications
| Input Voltage Range | 1.8V - 5.5V |
|---|---|
| Current Rating | 2A continuous |
| On-Resistance | 60mΩ typical |
| Quiescent Current | 0.5μA (disabled) |
| Turn-On Time | 100μs typical |
| Turn-Off Time | 10μs typical |
| Enable Threshold | 1.2V typical |
| Thermal Shutdown | 150°C |
| Operating Temperature | -40°C to +85°C |
| Package | SOT-23-5 |
Applications
Power distribution
Electronic system design
Power sequencing
Electronic system design
Battery-powered devices
Battery and charging management
IoT sensors
Sensor signal conditioning
Portable electronics
Electronic system design
FAE Expert Insights
"The LP5240 is a reliable load switch that I use frequently for power distribution in multi-rail systems. The 60mΩ on-resistance is excellent for the price point - at 1A current, you only get 60mV drop, which is negligible for most digital circuits. The 0.5μA disabled current is crucial for battery-powered devices where you need to completely shut off unused circuits. I've used this switch in IoT sensor designs where different sensors are powered on only when needed, significantly extending battery life. The enable pin has a 1.2V threshold, making it compatible with 1.8V and 3.3V logic. One implementation tip: place a small capacitor (0.1μF) near the input pin to suppress transients during switching. The thermal shutdown is a nice safety feature - I've seen it protect designs during fault conditions. The SOT-23-5 package is easy to handle and requires minimal board space. Overall, a solid load switch for power management applications."
Low on-resistance load switch with enable control for power distribution and sequencing
— Dr. Wang Li, BeiLuo
Frequently Asked Questions
What is the on-resistance of LP5240?
The LP5240 features a low on-resistance of 60mΩ typical. This low resistance minimizes voltage drop and power loss when the switch is on. At 1A current, the voltage drop is only 60mV, which is negligible for most digital circuits.
60mΩ on-resistance excellent for price point; minimizes voltage drop and power loss.
What is the maximum current of LP5240?
The LP5240 can support continuous currents up to 2A. This current capability is sufficient for most sub-systems in portable devices, including sensors, memory, and peripheral circuits. Ensure adequate PCB copper area for heat dissipation at high currents.
2A sufficient for most sub-systems; verify thermal design for continuous high-current operation.
How do I control LP5240?
LP5240 is controlled via an active-high enable pin. Drive the enable pin high (above 1.2V threshold) to turn the switch on. Drive it low or leave floating to turn the switch off. The enable pin is compatible with 1.8V and 3.3V logic levels.
Active-high enable; drive high to turn on, low to turn off; compatible with standard logic levels.
What is the disabled current of LP5240?
When disabled, LP5240 draws only 0.5μA typical current. This ultra-low disabled current makes it ideal for battery-powered applications where you need to completely shut off unused circuits to maximize battery life.
0.5μA disabled current excellent for battery life; use to power-gate unused circuits.
How fast does LP5240 switch?
LP5240 has a turn-on time of 100μs typical and turn-off time of 10μs typical. This fast switching enables quick power sequencing and rapid response to enable signals. The fast turn-off is particularly useful for quickly disconnecting faulted loads.
Fast switching suitable for power sequencing; 10μs turn-off quickly disconnects faulted loads.
What protection features does LP5240 include?
LP5240 includes thermal shutdown protection that turns off the switch if the die temperature exceeds 150°C. It also features reverse current blocking that prevents current flow from output to input when the switch is off.
Thermal shutdown protects against overheating; reverse blocking prevents back-feeding.
What applications are suitable for LP5240?
LP5240 is ideal for power distribution in multi-rail systems, power sequencing, turning off unused circuits to save power, and protecting sensitive circuits from power supply transients. It is commonly used in IoT devices, portable electronics, and battery-powered instruments.
Use for power distribution, sequencing, and power gating in battery-powered and multi-rail systems.