SC8305
5A synchronous buck converter with adjustable switching frequency and external synchronization for high-power applications
Product Overview
Description
The SC8305 is a high-current synchronous buck converter capable of delivering up to 5A continuous output current. It features adjustable switching frequency (200kHz to 1MHz) and can be synchronized to an external clock for multi-rail applications.
The device includes a power-good indicator, soft-start function, and comprehensive protection features. The wide input voltage range of 4.5V to 20V accommodates various power sources including 5V, 12V, and automotive power systems.
The QFN-20 package with exposed thermal pad provides excellent thermal performance for high-current operation.
Product Series
SC
Primary Application
High-power processors
Key Features
- 5A continuous output current
- Adjustable switching frequency
- External clock synchronization
- Power-good indicator
- Programmable soft-start
- Over-current protection
- QFN-20 package with thermal pad
Specifications
| Input Voltage | 4.5V to 20V |
|---|---|
| Output Current | Up to 5A |
| Efficiency | Up to 96% |
| Switching Frequency | 200kHz to 1MHz |
| Package | QFN-20 |
Applications
High-power processors
Electronic system design
FPGA core power
Electronic system design
ASIC power supplies
Electronic system design
Industrial controllers
Industrial automation and control
Telecom equipment
Electronic system design
FAE Expert Insights
"The SC8305 is SouthChip's high-current buck solution for demanding applications. The 5A capability makes it suitable for powering high-performance processors and FPGAs. The adjustable frequency is a key feature - you can optimize for efficiency (lower frequency) or solution size (higher frequency). The external sync capability is useful for multi-rail systems where you want to avoid beat frequencies. I've used this part in several telecom and industrial designs with excellent results. The efficiency is impressive - up to 96% at optimal conditions. Key design tips: use a quality inductor with low DCR (4.7μH typical), ensure plenty of input and output capacitance for high-current transients, and pay close attention to thermal design - the QFN-20 thermal pad needs good via connection to inner planes. The soft-start programming helps prevent inrush current issues. Overall, this is a powerful, flexible buck converter for high-current applications."
High-current 5A buck converter with adjustable frequency and sync capability
— David Wang, BeiLuo
Frequently Asked Questions
How do I select the switching frequency?
Switching frequency selection involves trade-offs: (1) Lower frequency (200-300kHz) - Higher efficiency, larger inductor, lower EMI. (2) Higher frequency (800kHz-1MHz) - Smaller inductor and capacitors, faster transient response, slightly lower efficiency. (3) Considerations - Balance efficiency vs size requirements. (4) External sync - Use when multiple converters need synchronized operation. (5) Default - Start with 500kHz for balanced performance.
Contact LiTong for frequency optimization guidance.
What thermal design is needed for 5A operation?
Thermal design for 5A operation: (1) Copper area - Minimum 1 square inch connected to thermal pad. (2) Thermal vias - Array of 0.3mm vias under QFN pad. (3) Inductor DCR - Use low-DCR inductor (<10mΩ) to minimize losses. (4) Airflow - Consider forced airflow for continuous 5A operation. (5) Temperature monitoring - Implement thermal monitoring in system. (6) Derating - Reduce current at high ambient temperatures. Proper thermal design is essential for reliable high-current operation.
Contact LiTong for thermal design optimization for high-current applications.
FAQ 3 for SC8305?
This is additional FAQ information for SC8305. Contact LiTong for detailed technical support and application guidance.
Contact LiTong for technical support.
FAQ 4 for SC8305?
This is additional FAQ information for SC8305. Contact LiTong for detailed technical support and application guidance.
Contact LiTong for technical support.
FAQ 5 for SC8305?
This is additional FAQ information for SC8305. Contact LiTong for detailed technical support and application guidance.
Contact LiTong for technical support.