LM2586SX-3.3/NOPB

LM2586SX-3.3/NOPB is one of the DC DC switching regulators included in the voltage regulator family of PMIC (Power Management Integrated Circuit). This family of highly integrated DC-DC converters provides a viable solution for cost-effective single-ended, unregulated to regulated applications.

Application Field

LM2586SX-3.3/NOPB can be widely used in the field of consumer electronics, portable electronic equipment, communications equipment and instrumentation, such as notebooks, digital cameras, mobile phones, industrial automation, GPS and other products. This voltage regulator offers advanced power supply design, and can generate accurate fixed output voltage and current up to 1.5A. It is a compact, low-cost, and efficient power supply solution.

Working Principle

LM2586SX-3.3/NOPB uses an innovative synchronous rectification scheme to reduce voltage drops on the pass element, qulification, sharply reduce the possibility of EMI issues, and often provide higher efficiencies than linear regulators. This component is designed to offer superior performance across a wide range of input supply voltages. It\'s working principle can be divided into multiple parts which are voltage feedback, error amplifier, PWM comparator, oscillator, power switch, blanace/soft start circuit and protection circuit.

First, the voltage feedback system is used to monitor the output voltage and adjust it to the desired level. The output voltage is fed back to the non-inverting pin of the error amplifier to be compared with the reference voltage from an external resistor divider. The difference between the two is amplified and then fed back to the PWM comparator. The output of the error amplifier is associated with the PWM comparator which compares the amplified error voltage with the triangular wave generated by the oscillator. The comparison will generate a rectangular wave with duty cycle determined by the error voltage magnitude.

Secondly, the power switch is driven by the rectangular wave we just mentioned, and this will drive the whole switching process. This ranges from the switching control of the transistor, changing the output voltage and determining the switch duty cycle. Besides, if the power switch is working in a continuous conduction mode, the voltage drops through the power switch will be minimized, thus have an improved efficiency.

Finally, the balance/soft start circuit is designed to prevent an abrupt output voltage that might damage the system. In addition, the protection circuit will protect the power source by disabling the power switch in case of various abnormalities, such as overvoltage, overcurrent and short circuit.

Conclusion

To sum up, LM2586SX-3.3/NOPB voltage regulator adopted Synchronous Rectification schemes to deliver high efficiency, low standby current and low cost, making it a popular choice for cost-sensitive applications. To ease the design process, it has plenty of features to protect operation, such as the output voltage folding, overload protection and thermal shutdown. Together with an adjustable switching frequency and an adjustable soft start time, make it a flexible part to meet different demands in the market.