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How to choose "common switching power supply chip" in China
When selecting a power IC, it's not just about meeting the performance and reliability requirements of the circuit—it also involves considering factors like size, weight, battery life, and cost. Here are some fundamental guidelines and recommendations to help you make the best choice.
1. **Best Use Cases for LDO Regulators**
LDO (Low Dropout) regulators are ideal when the output voltage needs to have extremely low ripple and noise, the input-output voltage difference is small, and the output current doesn’t exceed 100mA. These are particularly suitable for portable applications due to their low power consumption and compact design.
2. **Use Charge Pumps for Negative Power Supplies**
Portable devices often require a negative power supply. Since the current demand is typically low, using a charge pump IC to create an inverting voltage circuit is the simplest and most efficient method. If noise or precise regulation is required, consider using a charge pump with an integrated LDO regulator.
3. **Avoid Over-Engineering**
It’s important not to go for the latest high-precision, feature-rich devices unless necessary. Most power ICs have an accuracy range of ±2% to ±4%, with some offering higher precision at ±0.5% to ±1%. Choose the accuracy that matches your application’s needs to keep costs down. More complex devices tend to be more expensive, so if your product doesn't require advanced features like power-off functions or status signals, there’s no need to include them.
4. **Don’t Oversize the IC**
The three key parameters of a power IC are input voltage (VIN), output voltage (Vo), and maximum output current (Iomax). It’s best to select an IC where the working current is around 70–90% of its maximum Iomax. This ensures optimal performance without unnecessary overdesign.
5. **Choose the Right IC for Your Application**
Selecting the right power IC depends on the specific needs of your project. For example, the TB5812A from Yinlianbao Technology is a high-performance switching power supply controller designed for smart phone-level network products and small portable devices. It uses PSR (Primary Side Regulation) with digital logic control, eliminating the need for optocouplers and TL431 components, which reduces system complexity and cost.
The TB5812A integrates a 710V power switch, accurate CC/CV digital control, hysteresis-type OTP protection, and optimized drive circuits to improve efficiency and reduce electromagnetic interference (EMC). It supports QR (Quasi-Resonant) operation and offers a compact SOP-7 package with excellent insulation between high and low voltage pins. With a no-load consumption of less than 75mW, it’s ideal for energy-efficient designs.
In today’s world, electronic devices play a vital role in daily life. Shenzhen Yinlianbao Electronic Technology Co., Ltd. specializes in developing power solutions tailored to customer needs. Through collaboration with industry experts and technical exchanges, they provide cutting-edge technology trends, training for engineers, and support for small and medium-sized enterprises. Their commitment to quality and innovation has earned them a strong market presence and a solid reputation in the industry.