SC8105
3A synchronous buck converter with 96% efficiency and wide input voltage range for power management applications
Product Overview
Description
The SC8105 is a high-efficiency synchronous buck converter capable of delivering up to 3A output current. It features a wide input voltage range of 4.5V to 18V, making it suitable for various power sources including USB, adapters, and industrial supplies.
The device uses adaptive constant on-time control for fast transient response while maintaining high efficiency across the load range. It automatically switches between PWM mode at heavy loads and PFM mode at light loads to optimize efficiency.
Integrated high-side and low-side MOSFETs minimize external component count. Protection features include over-current protection, thermal shutdown, and input under-voltage lockout.
Product Series
SC
Primary Application
Smartphone power management
Key Features
- Synchronous rectification for high efficiency
- Wide input voltage range (4.5V-18V)
- Up to 3A output current
- Adaptive constant on-time control
- Auto PFM/PWM mode switching
- Internal compensation
- Power-good indicator
- Comprehensive protection
Specifications
| Input Voltage | 4.5V to 18V |
|---|---|
| Output Current | Up to 3A |
| Efficiency | Up to 96% |
| Switching Frequency | 500kHz |
| Package | SOT-23-6 |
Applications
Smartphone power management
Electronic system design
Tablet systems
Electronic system design
Set-top boxes
Electronic system design
Industrial equipment
Industrial automation and control
FPGA/DSP power supplies
Electronic system design
FAE Expert Insights
"The SC8105 is a versatile buck converter that I've used in many designs. The wide input voltage range (4.5V-18V) makes it very flexible - it can work from 5V USB, 12V adapters, or industrial 24V systems (with derating). The 3A current capability is sufficient for most system rails. Efficiency is excellent, typically 94-96% at mid-to-heavy loads. The auto PFM/PWM switching works well, maintaining reasonable efficiency even at light loads. The internal compensation simplifies design - no need to calculate external compensation components. One tip: the input capacitor should be placed very close to the IC with minimal loop area for best EMI performance. The SOT-23-6 package is compact but can handle 3A with proper PCB layout. Overall, this is a reliable, easy-to-use buck converter for general-purpose applications."
High-efficiency synchronous buck converter with wide input range and easy design
— David Wang, BeiLuo
Frequently Asked Questions
What is the efficiency of SC8105?
The SC8105 achieves excellent efficiency: (1) Peak efficiency - Up to 96% at optimal operating conditions (typically VIN=12V, VOUT=3.3V, IOUT=1-2A). (2) Heavy load efficiency - 94-96% at loads above 500mA. (3) Light load efficiency - >80% at 10mA load due to PFM mode. (4) Efficiency factors - Input/output voltage ratio, load current, inductor DCR, and PCB layout affect actual efficiency. (5) Thermal performance - High efficiency means less heat generation, reducing thermal management requirements. For battery-powered applications, this high efficiency extends runtime. For adapter-powered applications, it reduces power consumption and heat. Efficiency curves are provided in the datasheet for various input/output combinations.
Contact LiTong for efficiency analysis and optimization for your operating conditions.
How do I select the inductor for SC8105?
Inductor selection for SC8105: (1) Inductance value - 4.7μH is recommended for most applications. Range 3.3-10μH acceptable. (2) Current rating - Select inductor with saturation current >4A (higher than max load for margin). RMS current rating >3A. (3) DCR - Lower DCR improves efficiency. Target <50mΩ for 3A applications. (4) Core material - Ferrite core recommended for switching converters. Avoid powdered iron for high frequency. (5) Size - Balance between current capability and physical size. Shielded inductors reduce EMI. (6) Recommended parts - Coilcraft XAL series, Wurth WE-LHMI series, or similar. The inductor is the most critical external component affecting performance and efficiency. Proper inductor selection ensures stable operation and maximum efficiency.
Contact LiTong for inductor selection and component recommendations.
What is the price of SC8105?
Pricing for SC8105 depends on order volume: (1) Sample pricing - Contact LiTong for sample pricing. (2) Volume pricing - Tiered pricing structure with discounts at 1K, 10K, 100K, and higher volumes. (3) Distribution pricing - As an authorized SouthChip distributor, LiTong offers competitive pricing with flexible terms. (4) Price stability - SouthChip maintains stable pricing with minimal fluctuations. (5) Alternative options - LiTong can suggest pin-compatible alternatives if cost optimization is needed. Contact LiTong sales for formal quotations with your forecast volumes and delivery requirements.
Contact LiTong sales for formal pricing quotations.
What is the lead time for SC8105?
Lead time for SC8105: (1) Stock items - 1-2 weeks for items in LiTong inventory. (2) Standard lead time - 8-10 weeks typical for non-stock items. (3) Large orders - Contact LiTong for scheduling and allocation. (4) Expedited delivery - Rush orders may be accommodated for urgent requirements. (5) Long-term agreements - Schedule agreements available for high-volume customers. LiTong maintains safety stock of popular SouthChip products to support quick-turn requirements. Contact LiTong with your delivery requirements for specific lead time commitments.
Contact LiTong for current lead times and delivery scheduling.
Does SC8105 support RoHS compliance?
Yes, SC8105 is fully RoHS compliant: (1) RoHS 6/6 compliant - Contains no lead, mercury, cadmium, hexavalent chromium, PBB, or PBDE. (2) Halogen-free - Available in halogen-free versions upon request. (3) REACH compliant - Meets EU REACH regulations for chemical substances. (4) Conflict-free - Sourced from conflict-free suppliers. (5) Environmental certifications - Full material declarations available. (6) Green packaging - Compliant with environmental packaging requirements. SouthChip is committed to environmental compliance across all products. Compliance certificates and material declarations are available from LiTong upon request.
Contact LiTong for RoHS certificates and material declarations.