SGM4151
2A switching Li-ion battery charger with high efficiency and power path management for portable devices
Product Overview
Description
The SGM4151 is a high-efficiency switching battery charger designed for single-cell Li-ion and Li-polymer batteries.
With 2A charge current capability and up to 95% efficiency, it minimizes heat generation while charging batteries quickly.
The integrated power path management allows simultaneous battery charging and system operation from a single input.
Product Series
SGM
Primary Application
Smartphones and tablets
Key Features
- High-efficiency switching charger up to 95%
- 2A maximum charge current
- Power path management for simultaneous charge and system operation
- 1.5MHz switching for small inductor
- ±0.5% charge voltage accuracy
- Input current limiting for USB compliance
- Thermal regulation and protection
- I2C interface for programmable settings
Specifications
| Input Voltage | 4.0V to 13.5V |
|---|---|
| Battery Voltage | 4.2V (single-cell Li-ion) |
| Charge Current | Up to 2A |
| Trickle Charge | 100mA |
| Quiescent Current | 2mA (charging) |
| Standby Current | 50μA |
| Charge Accuracy | ±0.5% |
| Efficiency | Up to 95% |
| Switching Frequency | 1.5MHz |
| Package | QFN-16 (3mm x 3mm) |
Applications
Smartphones and tablets
Electronic system design
Portable media players
Electronic system design
Digital cameras
Electronic system design
Handheld instruments
Electronic system design
Power banks
Electronic system design
FAE Expert Insights
"The SGM4151 is an excellent switching charger for applications where efficiency and heat generation are critical. Unlike linear chargers that dissipate excess power as heat, the SGM4151 achieves up to 95% efficiency, allowing 2A charging without excessive thermal stress. The power path management is a key feature - it allows the system to operate from the input while simultaneously charging the battery, eliminating the voltage drop issues common with traditional chargers. I have used this part in tablet designs where the system needs to operate at full power while charging. The I2C interface provides flexibility for adjusting charge parameters based on temperature and battery condition. For high-current charging applications, this switching charger is highly recommended."
High-efficiency 2A switching charger with power path management
— Dr. Michael Chen, BeiLuo
Frequently Asked Questions
What is the advantage of switching vs linear battery charger?
Switching chargers like SGM4151 achieve much higher efficiency (up to 95%) compared to linear chargers (typically 60-75%). This means less heat generation, faster charging, and the ability to charge at higher currents without thermal issues. The trade-off is slightly higher cost and more external components.
Use switching charger for high-current applications or when heat is a concern. Use linear charger for cost-sensitive low-current applications.