ISL6539CA-T

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ISL6539CA-T is a special purpose voltage regulator integrated circuit (IC) developed by Intersil Corporation, a subsidiary of Renesas Electronics. It is mainly used in notebooks, netbooks and embedded computers, enabling systems to operate at lower voltages and improved efficiency. The device includes a configurable 2-phase buck switching regulator with high-efficiency buck drivers, configurable adaptive body diode emulation (ABDE) control, adjustable peak-current mode control voltage and Thermal Runaway Protection (TRP) capability.

The IC provides a wide wide output voltage range by using external components, configurable from 0.9V to 19V. It can be configured in two mode configurations, Continuous Conduction Mode (CCM) for low-input to low-output conversions and Critical Conduction Mode (CRM) for low-input to higher-output conversions. It also has an adjustable current limit and adjustable voltage slope option to optimize the power dissipation.

ISL6539CA-T uses a high efficiency synchronous buck converter with configurable ABDE control that enhances system efficiency under light and heavy load conditions. Adaptive body diode emulation ensures that the switching functionality of the converter is properly controlled, improving power conversion efficiency and eliminating the need for external body diode components. The device also provides an adjustable peak-current mode control voltage for maximum efficiency at light to moderate loads.

The device also includes an adjustable-current limit function, which provides accurate current limit control and avoids the need for current-sense resistors. The adjustable voltage slope control allows the converter to remain in CCM operation even with heavy load transients, ensuring excellent load transient performance. Additionally, the IC provides a Thermal Runaway Protection (TRP) feature to monitor die temperature, ensuring system reliability in case of over temperature or abnormal operation.

To simplify design and reduce component count, ISL6539CA-T comes with integrated bootstrap diodes and inrush current limit. It is optimized to support input voltage of up to 36V and programmable output voltages. The device includes a pull-up resistor circuit to provide an easy start-up procedure and keep a regulated voltage on the internal amplifier section. Furthermore, the device features low EMI operation at light to moderate load conditions and excellent EMI noise immunity.

In conclusion, ISL6539CA-T is a highly integrated voltage regulator IC designed for notebooks, netbooks and embedded computers. It provides high efficiency, adjustable current limit and adaptive body diode emulation control, adjustable peak-current mode control voltage, Thermal Runaway Protection and integrated bootstrap diodes with inrush current limit. Its low EMI operation and noise immunity make it an ideal choice for low voltage DC/DC conversion applications.

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