ISL62386 High-Efficiency Quad Output System Power Supply Controller for Notebook Computers

The ISL62386 controller generates supply voltages for battery-powered systems. It features two pulse-width modulation (PWM) controllers that are adjustable from 0.6V to 5.5V, along with two linear regulators, LDO5 and LDO3, which provide fixed outputs of 5V and 3.3V, respectively. Each regulator can deliver up to 100mA. The Channel 2 switching regulator automatically takes over the LDO5 load when programmed to output 5V, resulting in significant power savings and enhanced efficiency. The ISL62386 also offers on-board power-up sequencing, a power-good (PGOOD) output, digital soft-start functionality, and an internal soft-stop output discharge that prevents negative voltages during shutdown. Its patented R3 PWM control scheme ensures low jitter and rapid response to load transients. Light-load efficiency is optimized through period-stretching discontinuous conduction mode (DCM) operation. Additionally, an ultrasonic DCM mode is incorporated to minimize noise in audio frequency applications by limiting the minimum switching frequency to approximately 28kHz.

The ISL62386 is designed to meet the power management requirements of various battery-operated devices. Its dual PWM controllers facilitate flexible voltage regulation, allowing users to set output levels that are appropriate for their specific applications. The adjustable voltage range of 0.6V to 5.5V is particularly advantageous for systems that require different operating voltages for various components.

The two linear regulators, LDO5 and LDO3, provide stable power outputs of 5V and 3.3V, respectively, which are commonly utilized in microcontrollers and other digital circuits. With a maximum output current of 100mA from each regulator, the ISL62386 can support a range of peripheral devices without the need for additional external components.

The automatic takeover feature of the Channel 2 switching regulator enhances the efficiency of the power supply system by ensuring that the load is seamlessly managed between the linear regulator and the switching regulator. This capability not only conserves energy but also helps in maintaining optimal thermal performance.

On-board power-up sequencing is a critical feature for ensuring that all components in a system power up in the correct order, thus preventing potential damage and ensuring reliable operation. The PGOOD output provides a signal that can be used to indicate when the output voltages are stable and within specified limits, allowing for safe operation of downstream circuits.

The digital soft-start function aids in reducing inrush current during startup, while the internal soft-stop output discharge feature prevents negative voltage spikes during shutdown, further enhancing system reliability.

The patented R3 PWM control scheme is notable for its ability to minimize jitter and provide a swift response to changes in load conditions, making it suitable for applications sensitive to voltage fluctuations. The inclusion of period-stretching DCM operation improves efficiency at light loads, which is particularly beneficial in battery-powered applications where power conservation is paramount.

Moreover, the ultrasonic DCM mode addresses the challenges of noise in audio frequency applications, ensuring that the minimum switching frequency is kept at approximately 28kHz, thus preventing interference with audio signals and enhancing the overall performance of audio-related devices.

In summary, the ISL62386 controller is a robust solution for generating supply voltages in battery-powered systems, offering a range of features that enhance efficiency, reliability, and performance across various applications.The ISL62386 controller generates supply voltages for battery-powered systems. The ISL62386 includes two pulse-width modulation (PWM) controllers, adjustable from 0. 6V to 5. 5V, and two linear regulators, LDO5 and LDO3, that generate a fixed 5V output and a fixed 3. 3V output respectively. Each can deliver up to 100mA. The Channel 2 switching regula tor will automatically take over the LDO5 load when programmed to 5V output. This provides a large power saving and boosts efficiency. The ISL62386 includes on-board power-up sequencing, one power-good (PGOOD) output, digital soft-start, and an internal soft-stop output discharge that prevents negative voltages on shutdown. The patented R3 PWM control scheme provides a low jitter system with fast response to load transients.

Light-load efficiency is improved with period-stretching discontinuous conduction mode (DCM) operation. To eliminate noise in audio frequency applications, an ultrasonic DCM mode is included, which limits the minimum switching frequency to approximately 28kHz.

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