CS5080
CS5080 1A synchronous buck converter, 2.5V-5.5V input, 1MHz switching, 95% efficiency, PFM/PWM modes.
Product Overview
Description
The CS5080 is a high-efficiency synchronous buck converter capable of delivering up to 1A output current. It operates from a 2.5V to 5.5V input, making it ideal for single-cell Li-ion battery applications.
With 1MHz switching frequency, the CS5080 allows the use of small external components while maintaining low output ripple. The automatic PFM/PWM mode switching optimizes efficiency across the entire load range, achieving up to 95% efficiency.
Comprehensive protection features include cycle-by-cycle current limit, thermal shutdown, and undervoltage lockout. The device is available in a compact SOT23-5 package suitable for space-constrained portable devices.
Product Series
CS
Primary Application
Li-ion battery-powered devices
Key Features
- Synchronous rectification for high efficiency
- Automatic PFM/PWM mode switching
- 1MHz switching frequency
- 100% duty cycle operation
- Internal soft-start
- Current limit protection
- Thermal shutdown protection
- Compact SOT23-5 package
Specifications
| Input Voltage | 2.5V to 5.5V |
|---|---|
| Output Voltage | 0.6V to Vin |
| Output Current | 1A max |
| Switching Frequency | 1MHz |
| Efficiency | Up to 95% |
| Quiescent Current | 40uA PFM mode |
| Shutdown Current | <1uA |
| Load Regulation | +/-1% |
| Line Regulation | +/-0.5% |
| Package | SOT23-5 |
Applications
Li-ion battery-powered devices
Battery and charging management
Smartphones and tablets
Electronic system design
Portable media players
Electronic system design
Digital cameras
Electronic system design
IoT sensor nodes
Sensor signal conditioning
FAE Expert Insights
"The CS5080 is an excellent choice for single-cell Li-ion applications requiring up to 1A output. The 95% efficiency at moderate loads helps maximize battery life in portable devices. I particularly like the automatic PFM/PWM switching - it maintains good efficiency even at light loads where many converters struggle. The 1MHz switching allows small 2.2uH inductors, saving board space. I've used this part in numerous IoT sensor designs where the 40uA quiescent current in PFM mode helps extend battery life. The protection features are comprehensive and the device is stable with various output capacitor types. Overall, a solid, cost-effective buck converter for portable applications."
High-efficiency buck converter with excellent light-load performance
— David Park, BeiLuo
Frequently Asked Questions
What is the efficiency at light loads?
The CS5080 achieves excellent light-load efficiency through automatic PFM (Pulse Frequency Modulation) mode switching. At loads below approximately 100mA, the converter enters PFM mode, reducing switching losses and improving efficiency. Typical efficiency is 85-90% at 10mA load, and 80-85% at 1mA load. This is significantly better than converters operating in fixed PWM mode at light loads. The 40uA quiescent current in PFM mode helps maximize battery life in standby conditions. For applications with very light loads, consider using the shutdown mode (<1uA) when the output is not needed.
PFM mode provides excellent light-load efficiency; use shutdown for standby conditions.
What are the key features of CS5080?
The CS5080 offers excellent performance characteristics including Synchronous rectification for high efficiency, Automatic PFM/PWM mode switching, 1MHz switching frequency. It is designed for Li-ion battery-powered devices and Smartphones and tablets. The device operates over a wide temperature range and provides reliable performance in demanding environments.
Contact our FAE team for detailed application support and sample requests for CS5080.
What are the key features of CS5080?
The CS5080 offers excellent performance characteristics including Synchronous rectification for high efficiency, Automatic PFM/PWM mode switching, 1MHz switching frequency. It is designed for Li-ion battery-powered devices and Smartphones and tablets. The device operates over a wide temperature range and provides reliable performance in demanding environments.
Contact our FAE team for detailed application support and sample requests for CS5080.
What are the key features of CS5080?
The CS5080 offers excellent performance characteristics including Synchronous rectification for high efficiency, Automatic PFM/PWM mode switching, 1MHz switching frequency. It is designed for Li-ion battery-powered devices and Smartphones and tablets. The device operates over a wide temperature range and provides reliable performance in demanding environments.
Contact our FAE team for detailed application support and sample requests for CS5080.
What are the key features of CS5080?
The CS5080 offers excellent performance characteristics including Synchronous rectification for high efficiency, Automatic PFM/PWM mode switching, 1MHz switching frequency. It is designed for Li-ion battery-powered devices and Smartphones and tablets. The device operates over a wide temperature range and provides reliable performance in demanding environments.
Contact our FAE team for detailed application support and sample requests for CS5080.