SGM41511
3A synchronous switch-mode Li-ion battery charger with high efficiency, power path management, and I2C interface.
Product Overview
Description
The SGM41511 is a high-efficiency synchronous switch-mode battery charger designed for high-capacity single-cell Li-ion batteries.
With up to 3A charge current and integrated power path management, it supports simultaneous system operation and battery charging.
The I2C interface allows flexible configuration of charge parameters and system monitoring.
Product Series
SGM
Primary Application
Smartphones and tablets
Key Features
- High-efficiency synchronous switching
- Up to 3A charge current
- Integrated power path management
- I2C programmable charge parameters
- USB OTG support up to 1.5A
Specifications
| Input Voltage | 3.9V - 13.5V |
|---|---|
| Charge Current | Up to 3A |
| Battery Voltage | 3.8V - 4.44V (programmable) |
| Charge Efficiency | Up to 93% |
| Protection Features | OVP, OCP, thermal, input current limit |
| Package | QFN-4x4-24 |
Applications
Smartphones and tablets
Electronic system design
Portable media players
Electronic system design
Industrial handheld devices
Industrial automation and control
Medical portable equipment
Medical electronics
Power banks with fast charging
Battery and charging management
FAE Expert Insights
"The SGM41511 is SGMICRO's advanced battery charging technology. The integrated power path is a game-changer for mobile devices - it allows the system to power up instantly when connected to a charger, even with a deeply discharged battery. The switching architecture provides 93% efficiency at 2A charge current, significantly reducing thermal stress compared to linear chargers. I particularly appreciate the I2C interface which enables dynamic charge current adjustment based on system load and thermal conditions. For high-end consumer electronics, this charger delivers performance comparable to premium international brands at a competitive price point."
Advanced switching charger with power path for high-performance mobile devices
— Kevin Li, BeiLuo
Frequently Asked Questions
What is the advantage of the power path feature in the SGM41511?
The power path feature in the SGM41511 provides several key advantages: 1) Instant-on capability - the system can power up immediately when connected to a charger, even with a deeply discharged or missing battery; 2) Reduced battery cycling - the system draws power directly from the input rather than continuously cycling the battery; 3) Dynamic power management - the charger automatically adjusts charge current based on available input power and system load; 4) Battery supplement mode - if system load exceeds input capacity, the battery supplements the difference; 5) Minimized charge time - charging continues even during heavy system load.
Power path is essential for devices requiring uninterrupted operation. The SGM41511 manages power path automatically without host intervention.
How do I configure the SGM41511 using the I2C interface?
The SGM41511 I2C interface allows programming of various parameters: 1) Charge voltage - programmable from 3.8V to 4.44V in 16mV steps; 2) Charge current - programmable up to 3A in 64mA steps; 3) Input current limit - sets maximum current drawn from adapter (useful for USB compliance); 4) Safety timers - watchdog and charge termination timers; 5) OTG current limit - for USB OTG power delivery. The device supports standard I2C speeds up to 400kHz. Default values are loaded at power-up, allowing operation without I2C configuration for standard applications.
Use I2C for dynamic configuration. The device works with default settings for basic applications without host control.
What is the efficiency of the SGM41511 at different charge currents?
The SGM41511 achieves excellent efficiency across the charge current range: approximately 93% at 2A charge current, 91% at 1A, and 88% at 500mA. The high efficiency is maintained across the input voltage range due to the synchronous switching architecture. Compared to linear chargers which dissipate (Vin - Vbat) x Icharge as heat, the switching charger significantly reduces thermal stress. For example, charging a 3.7V battery at 2A from a 5V input: linear charger dissipates 2.6W while SGM41511 dissipates only about 280mW (assuming 93% efficiency).
The high efficiency makes SGM41511 ideal for high-current charging applications where thermal management is critical.
Does the SGM41511 support USB OTG functionality?
Yes, the SGM41511 supports USB On-The-Go (OTG) functionality, allowing the device to supply power to USB peripherals. The OTG mode can deliver up to 1.5A at 5V to power external devices such as USB drives, keyboards, or other accessories. OTG operation is enabled through the I2C interface and includes current limiting and short-circuit protection. The boost converter used for OTG shares the same inductor as the buck charger, minimizing external component count. This feature is particularly useful for tablets and smartphones that need to power USB accessories.
Enable OTG mode through I2C when USB host functionality is required. Ensure battery has sufficient charge to support OTG load.
What safety protections does the SGM41511 include?
The SGM41511 includes comprehensive safety protections: 1) Input over-voltage protection (OVP) - disables charging if input exceeds safe limits; 2) Battery over-voltage protection - prevents overcharging; 3) Charge current limiting - programmable limit prevents excessive current; 4) Thermal regulation and shutdown - reduces current or disables charging if temperature exceeds limits; 5) Watchdog timer - resets charger if I2C communication is lost; 6) Safety timer - terminates charging if not completed within programmed time; 7) Reverse current protection - prevents battery discharge back to input. These protections ensure safe operation under all conditions.
The comprehensive protection suite makes SGM41511 suitable for safety-critical applications. All protections operate automatically without host intervention.