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How to choose "common switching power supply chip" in China
Selecting the right power IC is not just about meeting performance and reliability requirements, but also considering factors like size, weight, battery life, and cost. Here are some key principles and recommendations to guide your selection.
1. **Best Use Cases for LDOs**
When the output voltage needs to have extremely low ripple and noise, and the input-output voltage difference is small, with an output current of no more than 100mA, a low-dropout (LDO) linear regulator is ideal for most portable applications. These devices offer stable and clean power, making them suitable for sensitive circuits.
2. **Use Charge Pumps for Negative Power Supplies**
Portable systems often require a negative power supply. Since the current demand is usually low, a charge pump IC is the simplest solution for generating a negative voltage. If noise or regulation is a concern, consider using a charge pump IC that includes an LDO for better performance.
3. **Avoid Over-Engineering**
Not every design requires the latest high-precision, feature-rich power ICs. Most power ICs have an accuracy range of ±2% to ±4%, with some offering up to ±0.5%. Choose the accuracy that matches your application’s needs to reduce costs. More advanced features can increase both cost and size, so if you don’t need functions like power-off control or status signals, it's better to opt for simpler solutions.
4. **Don’t Oversize the Power IC**
The three main parameters to consider are input voltage (VIN), output voltage (Vout), and maximum output current (Iomax). Ideally, the working current should be around 70–90% of the IC’s maximum output current. This ensures optimal efficiency and avoids unnecessary component size and cost.
5. **Choose Efficient and Compact Solutions**
High-performance power ICs, such as the TB5812A from Yinlianbao Technology, are designed for smart phone-level and small portable applications. This single-chip switching controller features a built-in 710V power switch, eliminating the need for external optocouplers and TL431 components. It offers accurate CV/CC digital control, hysteresis OTP protection, and optimized drive circuitry to improve efficiency and reduce electromagnetic interference (EMC).
TB5812A Features:
- Built-in 710V power switch
- PSR (source-side) control mode eliminates external feedback components
- Accurate CC/CV digital logic control
- Hysteresis-type OTP protection
- Optimized drive circuit for higher efficiency and Class 5 energy compliance
- SOP-7 package for safe insulation between high and low voltage pins
- Low no-load consumption (<75mW)
- Low EMC emissions for simplified filtering
- Comprehensive protection circuits for enhanced reliability
- Quasi-resonant (QR) operation mode
In today’s world, electronic devices play a vital role in daily life. Shenzhen Yinlianbao Electronic Technology Co., Ltd. specializes in developing customized power solutions tailored to customer needs. Through technical collaboration and industry engagement, the company provides cutting-edge product trends, training for engineers, and support for small and medium-sized manufacturers. With a strong market presence and a solid reputation, Yinlianbao continues to deliver reliable and innovative power solutions worldwide.