ISL6558IBZ-T

Frequency - Switching:	80kHz ~ 1.5MHz
Base Part Number:	ISL6558
Supplier Device Package:	16-SOIC
Package / Case:	16-SOIC (0.154", 3.90mm Width)
Operating Temperature:	-40°C ~ 85°C (TA)
Control Features:	Enable, Frequency Control, Power Good
Serial Interfaces:	--
Clock Sync:	No
Synchronous Rectifier:	--
Duty Cycle (Max):	75%
Series:	--
Voltage - Supply (Vcc/Vdd):	4.75 V ~ 5.25 V
Output Phases:	4
Number of Outputs:	4
Topology:	Buck
Output Configuration:	Positive
Function:	Step-Down
Output Type:	PWM Signal
Part Status:	Obsolete
Packaging:	Tape & Reel (TR)

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ISL6558IBZ-T Application Field and Working Principle

ISL6558IBZ-T is a voltage regulator manufactured by Intersil Corporation. It is a member of the company\'s portfolio of Power Management Integrated Circuits (PMIC) and is used in digital devices such as computers, telecommunication systems, and medical devices. The regulator is classified as a DC to DC switching controller, due to its ability to switch input voltage signals from one voltage level to another. This enables the device to step-up, step-down, or invert an input voltage signal.

Features and Uses

The ISL6558IBZ-T is a single step-down three phase phase-shifted full bridge (P&S FB) synchronous buck controller. Its primary benefit is its ability to provide excellent efficiency and excellent transient response for the applications that require the support of multi CPU cores. Other advantages of the ISL6558IBZ-T include its integrated high-side MOSFET drivers, low bill of materials (BOM) cost, its ability to support a wide input range, and its high power density design.The ISL6558IBZ-T is designed to provide excellent current sharing, reducing the need for external components to ensure fairness of current distribution in multi-phase designs. The device is also equipped with a temperature sensing system and adaptive voltage scaling (AVS) output, enhanced clock jitter control, programmable slew rate control, an integrated compensation block, and an automatic start-up mode selection. The ISL6558IBZ-T is suitable for applications such as desktop computers, gaming machines, gaming consoles, servers, home theater systems, TVs, set top boxes, car audio systems, tablets and smart phones, and many other electronic devices.

How it Works

The ISL6558IBZ-T operates using phase-shifted full bridge (P&S FB) synchronous buck controller technology. In this arrangement, the input voltage is stepped-down and synchronized to the switching frequency set by the switch controller. The internal high-side and low-side MOSFET drivers of the controller provide the synchronization of the switch frequency and ensure accurate current share. The integrated temperature sensing system of the device helps to further improve current sharing accuracy and regulated output accuracy. One of the main benefits of the ISL6558IBZ-T is its wide range of operating frequencies. With this, designers can regulate the frequency independently, thereby improving efficiency and saving cost. The device’s wide range of operating frequencies also ensures excellent transient response. For the best results, the output voltage of the device should be preset by external VRing resistors connected to the VOUT pins. This helps to optimize the converter circuit efficiency, allowing the device to remain cool and operate efficiently in applications that require high input voltages. Furthermore, the ISL6558IBZ-T offers high power density by allowing the integration of up to three synchronous buck converters with a single device.

Conclusion

The ISL6558IBZ-T is a state-of-the-art DC to DC switching controller from Intersil Corporation. It offers excellent efficiency and a wide range of operating points, allowing designers to optimize the converter efficiency. Additionally, its integrated high-side MOSFET drivers and automatic start-up mode selection further improve the performance of the device. The ISL6558IBZ-T is suitable for applications requiring multi CPU cores and is designed to provide excellent current sharing, reduce BOM cost, and ensure excellent transient response.

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