SC9017
280mA linear Li-ion battery charger with ultra-low quiescent current in compact SOT-23-5 package for space-constrained applications
Product Overview
Description
The SC9017 is an ultra-low power linear battery charger designed for space-constrained and power-sensitive applications. It provides up to 280mA charge current in a tiny SOT-23-5 package, making it ideal for wearables, TWS earbuds, and IoT devices.
The device features extremely low quiescent current (<1μA in standby), minimizing battery drain when not charging. The simple design requires no external inductor and minimal external components, reducing solution size and cost.
Comprehensive protection features including over-voltage, over-current, and thermal protection ensure safe and reliable charging operation in compact designs.
Product Series
SC
Primary Application
TWS earbuds
Key Features
- 280mA linear charger
- Ultra-low standby current (<1μA)
- Compact SOT-23-5 package
- No inductor is needed
- Minimal external components
- Comprehensive protection
- Automatic charge termination
Specifications
| Charge Current | Up to 280mA |
|---|---|
| Charge Voltage | 4.2V ±1% |
| Input Voltage | 4.5V to 6.5V |
| Standby Current | <1μA |
| Package | SOT-23-5 |
Applications
TWS earbuds
Electronic system design
Smart watches
Electronic system design
Fitness trackers
Electronic system design
IoT sensors
Sensor signal conditioning
Wearable devices
Electronic system design
FAE Expert Insights
"The SC9017 is my go-to recommendation for ultra-compact wearable applications. The SOT-23-5 package is incredibly small - perfect for TWS earbuds and smart watches where every millimeter counts. The sub-1μA standby current is crucial for wearables that spend most of their time in sleep mode. The 280mA charge current is sufficient for the small batteries typically used in wearables (100-500mAh). The linear topology means no inductor is needed, saving significant board space and cost. I've used this part in dozens of wearable designs. Key design tips: the small package has limited heat dissipation, so keep charge current at or below 280mA. Place input and output capacitors very close to the IC. Overall, this is an excellent, cost-effective solution for space-constrained battery charging."
Ultra-compact linear charger with sub-1μA standby current for wearables
— Sarah Liu, BeiLuo
Frequently Asked Questions
Why is the standby current so important for wearables?
Standby current is critical for wearables because: (1) Most wearables spend >90% of time in standby/sleep mode. (2) Even small standby currents significantly impact battery life over time. (3) SC9017's <1μA standby means minimal battery drain when not charging. (4) For a 100mAh battery, <1μA standby adds only ~0.7% daily drain. (5) This extends time between charges and improves user experience. The ultra-low standby is a key advantage for always-worn devices.
Contact LiTong for low-power design optimization.
What battery sizes work best with SC9017?
The SC9017 is optimized for small batteries: (1) Ideal range - 50mAh to 500mAh Li-ion/Li-polymer cells. (2) Charge time - At 280mA, a 200mAh battery charges in ~1 hour. (3) TWS earbuds - Typically 40-80mAh, perfect fit. (4) Smart watches - 200-400mAh, good match. (5) Fitness bands - 100-200mAh, ideal range. (6) Larger batteries - Can be charged but will take longer. For batteries >1000mAh, consider SC4056 for faster charging.
Contact LiTong for battery and charger matching guidance.
How small is the total solution size?
The SC9017 solution is extremely compact: (1) IC package - 2.9mm x 1.6mm SOT-23-5. (2) External components - 2 capacitors (0402), 1 resistor (0402). (3) Total solution - Approximately 5mm x 5mm including all components. (4) No inductor - Saves significant space compared to switching chargers. (5) Height - All components under 0.5mm height. (6) Comparison - One of the smallest complete charger solutions available. This tiny footprint makes it ideal for the most space-constrained wearable designs.
Contact LiTong for compact layout design guidance.
FAQ 4 for SC9017?
This is additional FAQ information for SC9017. Contact LiTong for detailed technical support and application guidance. For more detailed information and application-specific guidance, please contact LiTong's technical support team.
Contact LiTong for technical support.
FAQ 5 for SC9017?
This is additional FAQ information for SC9017. Contact LiTong for detailed technical support and application guidance. For more detailed information and application-specific guidance, please contact LiTong's technical support team.
Contact LiTong for technical support.