L5986

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The L5986 by STMicroelectronics is a high-frequency synchronous step-down SWIFT converter specifically designed to provide a high level of integration for high-performance and low-cost applications. It is intended for use in consumer and automotive applications. The device offers up to 1 A continuous output current over a wide input voltage range and integrates a high-speed current-mode pulse-width modulation (PWM) controller and low on-resistance N-channel MOSFET drivers.

The application field of the L5986 includes consumer, automotive and industrial Power Management applications. It is suitable for powering application CPUs with up to 1A from a wide input voltage range. It is also suitable for any synchronous buck applications requiring fast transient response and flexible design, for example, TV power supply, notebook adapter, and various battery charger applications.

The L5986 working principle is based on the switching regulator design. A regulator is used to generate a regulator voltage from a fixed input voltage or current. The regulator voltage is determined by the operating parameters of the regulator such as the input voltage or current, output voltage and current, a frequency and circuit components such as resistors, capacitors, inductors and diodes. The SWIFT converter has a PWM control circuit, which is used to control the switching times of the power MOSFETs and regulate the output voltage. The PWM control circuit uses a current-mode control technique in order to achieve a constant output voltage over a wide range of input voltages.

The L5986 has improved features to guarantee fast transient response and high efficiency. It also offers multiple feedback options, adjustable soft-start time, power-good signal and various protection functions including over-voltage protection, under-voltage lockout and over-current protection.

In summary, the L5986 is a high-performance synchronous step-down SWIFT converter. It is suitable for consumer, automotive and industrial Power Management applications offering up to 1A continuous output current. It also has improved features that ensure fast transient response and high efficiency.

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