BP2306
High-efficiency synchronous buck converter with 3A output current and wide 4.5V-18V input range
Product Overview
Description
The BP2306 is a high-efficiency synchronous buck converter capable of delivering up to 3A continuous output current. It features a wide input voltage range of 4.5V to 18V, making it suitable for various applications including consumer electronics and industrial systems.
This converter uses internal synchronous rectification to achieve efficiencies up to 95%, reducing power dissipation and thermal requirements. The fixed-frequency PWM operation at 500kHz allows for small external components while maintaining good load transient response.
Built-in protection features include over-current protection, over-temperature protection, and input under-voltage lockout. The BP2306 is available in compact packages suitable for space-constrained designs.
Product Series
BP
Primary Application
Consumer electronics
Key Features
- Synchronous rectification for high efficiency
- Wide input voltage range 4.5V-18V
- Up to 3A output current
- Fixed 500kHz switching frequency
- Internal compensation
- Comprehensive protection features
Specifications
| Input Voltage | 4.5V-18V |
|---|---|
| Output Current | Up to 3A |
| Output Voltage | 0.8V to VIN |
| Switching Frequency | 500kHz |
| Efficiency | Up to 95% |
| Quiescent Current | <1mA |
| Package | SOP-8 |
Applications
Consumer electronics
Consumer electronics
Industrial control systems
Industrial automation and control
Battery-powered devices
Battery and charging management
Set-top boxes
Electronic system design
Networking equipment
Communication and interface
FAE Expert Insights
"The BP2306 is a solid choice for medium-current buck applications requiring high efficiency. The internal compensation simplifies design by eliminating external compensation components, making it ideal for customers who want quick time-to-market. In my experience, this converter achieves 90-95% efficiency across a wide load range, which is excellent for thermal management in compact enclosures. The 500kHz switching frequency strikes a good balance between component size and EMI. I recommend this part for set-top boxes, networking equipment, and industrial control applications. For higher current requirements, consider the BP2308 which offers 5A capability with similar features."
High-efficiency synchronous buck with internal compensation for simplified design
— Kevin Wu, BeiLuo
Frequently Asked Questions
What is the maximum output current of BP2306?
The BP2306 supports maximum continuous output current of 3A under normal operating conditions. The actual maximum current depends on input voltage, output voltage, thermal conditions, and ambient temperature. At high ambient temperatures or with inadequate heat sinking, the maximum current may be thermally limited. For reliable operation, it is recommended to operate at 80% of maximum rated current with proper thermal management. The over-current protection typically triggers at 4-5A to protect the device.
For applications above 2.5A, verify thermal performance or consider BP2308 with 5A capability.
How do I select the output inductor value?
Output inductor selection involves trade-offs between ripple current, transient response, and size. The inductor value is calculated using: L = (Vout × (Vin - Vout)) / (Vin × fsw × ΔIL), where ΔIL is the desired inductor ripple current (typically 20-40% of output current). For BP2306 at 500kHz, typical inductor values are 2.2μH to 10μH depending on output voltage and current. Lower inductance gives better transient response but higher ripple current. Higher inductance reduces ripple but increases size and cost. Use shielded inductors for EMI-sensitive applications.
Use BPSemi's inductor selection guide or contact LiTong for inductor recommendations.
What output capacitor should I use?
Output capacitor selection affects output ripple, transient response, and loop stability. For BP2306, use ceramic capacitors (X5R or X7R dielectric) with adequate voltage rating. Typical values are 22μF to 100μF depending on output current and ripple requirements. Consider DC bias derating - ceramic capacitors lose capacitance under DC bias. Use multiple capacitors in parallel for high current applications. Low ESR is important for minimizing output voltage ripple. Follow BPSemi's recommended capacitor list for optimal performance.
Use ceramic capacitors with adequate voltage margin. Contact LiTong for capacitor selection guidance.
How does internal compensation affect the design?
Internal compensation simplifies the design by eliminating external compensation components (resistors and capacitors). The converter is pre-compensated for typical applications with ceramic output capacitors. However, internal compensation limits flexibility in optimizing transient response for specific applications. For most standard applications, internal compensation provides adequate stability and transient performance. If your application requires specific transient response characteristics or uses non-standard output capacitors, consider converters with external compensation or contact BPSemi for guidance.
Internal compensation is suitable for most applications. Contact LiTong for applications requiring custom compensation.
Can BP2306 be used for automotive applications?
The standard BP2306 is designed for consumer and industrial applications with 4.5V-18V input range. For automotive applications, consider the following: 1) Input voltage transients - automotive systems can experience load dump transients up to 40V, 2) Temperature range - automotive requires -40°C to +125°C or +150°C operation, 3) AEC-Q100 qualification - required for automotive grade components. BPSemi may offer automotive-grade variants or you may need additional input protection circuits. Contact BPSemi or LiTong for automotive application support.
For automotive applications, verify temperature range and transient requirements. Contact LiTong for automotive-qualified solutions.