ISL6520IB

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ISL6520IB Application Field and Working Principle

The ISL6520IB is a current-mode DC/DC synchronous buck controller with combination of high-performance analog integrated circuits and advanced packaging technologies. Specifically designed to provide a full set of platform solutions for VR12/VR12.5, the ISL6520IB is suitable for a wide range of DC/DC voltage regulators applications, including DC/DC converter designs, server and storage system architectures, power supply design, and mobile devices.

Application Field

The ISL6520IB is designed to meet the demanding VR applications with the following features:

• High efficiency and easy to design
• Integrated low-side/high-side MOSFET drivers
• Up to 90% fixed-frequency peak current mode operation
• External compensation for wide range solutions
• High-accuracy cycle-by-cycle current limit
• Power good indicator (PGOOD)
• Programmable frequency with spread spectrum and sync-synchronization
• Separate supply VDD5V for logic supply
• Wide input voltage range

Equipped with a patented peak current mode control architecture, the ISL6520IB supports full-featured constant-frequency operation, provides excellent load and line transient response, as well as improved loop stability. The ISL6520IB also offers fractional-R current sensing and phase-shedding technology to enhance efficiency.

Working Principle

The ISL6520IB is a current-mode DC/DC synchronous buck controller with combination of high-performance analog integrated circuits and advanced packaging technologies. It is specifically designed to provide a wide range of DC/DC voltage regulator solutions, including server, storage system, and mobile devices.

In its working principle, the ISL6520IB first senses the input voltage, then converts it into a proportional pulse width modulation (PWM) output signal. This PWM signal is then used to drive the high-side and low-side MOSFETs, which in turn generate the correct output voltage. During this process, the maximum current flowing through the inductor is also monitored and regulated, so that the output voltage remains constant.

The ISL6520IB series implements an adjustable-frequency peak-current-mode control method with several features designed to optimize power conversion efficiency:

• Adaptive, fixed-frequency peak-current mode control
• Extendable multi-phase operation
• Phase shedding to reduce even-order harmonics
• Fractional-R sensing to reduce current sensing losses
• Half-bridge/Full-bridge secondary side control and protection

The ISL6520IB is also equipped with additional features, such as adjustable soft start, programmable frequency with spread spectrum, synchronization, and power good indicator (PGOOD).

Conclusion

As an advanced current-mode DC/DC synchronous buck controller, the ISL6520IB is suitable for a wide range of DC/DC voltage regulator applications. With its patented peak current mode control architecture, the ISL6520IB offers high efficiency and easy design, integrated high-side/low-side MOSFET drivers, up to 90% fixed-frequency peak current mode operation, external compensation for wide range solutions, and power good indicator. Additionally, the ISL6520IB features adjustable-frequency peak-current-mode control, extendable multi-phase operation, phase shedding to reduce even-order harmonics, fractional-R sensing to reduce current sensing losses, and half-bridge/full-bridge secondary side control and protection.

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