ISL6528 Dual Regulator-Standard Buck PWM and Linear Power Controller

Description: The ISL6528 offers power control and protection for two output voltages in high-performance graphics cards and other embedded processor applications. This dual-output controller drives an N-Channel MOSFET in a standard buck topology and an NPN pass transistor in a linear configuration. It provides a regulated high current, low voltage supply and an independent, lower current supply, all integrated into an 8-lead SOIC package. The controller is particularly suitable for graphics card applications that require both graphics processing unit (GPU) and memory supplies. The standard buck converter operates with a simple, single feedback loop, utilizing voltage-mode control with a fast transient response. Both the switching regulator and linear regulator maintain a maximum static regulation tolerance of ±2% across line, load, and temperature ranges. Each output can be adjusted by external resistors. An integrated soft-start feature ensures that both supplies are brought into regulation smoothly. The outputs are monitored via the feedback (FB) pins for undervoltage events; if either output falls below 52.5% of the internal reference voltage, both regulators will shut down.

The ISL6528 is designed to efficiently manage power delivery in demanding applications, particularly in graphics processing units (GPUs) and associated memory components. Its architecture leverages a dual-output configuration which allows for the simultaneous regulation of two distinct voltage levels, catering to the different power requirements of the GPU and memory. The use of an N-Channel MOSFET in a buck topology enhances efficiency by minimizing conduction losses during operation, while the linear regulator, utilizing an NPN pass transistor, provides a stable lower current supply with minimal noise.

The voltage-mode control implemented in the buck converter ensures quick response to load changes, which is critical in applications where power demands can fluctuate rapidly. The ±2% regulation tolerance guarantees that the outputs remain stable under varying conditions, protecting sensitive components from voltage variations that could lead to malfunction or damage.

User adjustability of the output voltages through external resistors allows for customization to meet specific application needs, providing flexibility in design. The integrated soft-start feature is crucial in preventing inrush current, which can damage components and affect system stability. The monitoring of undervoltage events through the FB pins adds an important layer of protection; the automatic shutdown feature ensures that if the output voltage drops significantly, the system can prevent further damage by disabling the regulators.

Overall, the ISL6528 is a robust solution for power management in high-performance electronics, combining efficiency, reliability, and flexibility in a compact package.The ISL6528 provides the power control and protection for two output voltages in high-performance graphics cards and other embedded processor applications. The dual-output controller drives an N-Channel MOSFET in a standard buck topology and a NPN pass transistor in a linear configuration.

The ISL6528 provides both a regulated high current, low vo ltage supply and an independent, lower current supply integrated in an 8-lead SOIC package. The controller is ideal for graphics card applications where both graphics processing unit (GPU) and memory supplies are required. The standard buck converter is a simple, single feedback loop, voltage-mode control with fast transient response.

Both the switching regulator and linear regulator provide a maximum static regulation tolerance of ±2% over line, load, and temperature ranges. Each output is user-adjustable by means of external resistors. An integrated soft-start feature brings both supplies into regulation in a controlled manner. Each output is monitored via the FB pins for undervoltage events. If either output drops below 52. 5% of the internal reference voltage, both regulators are shutdown.