ISL6551IRZ

Frequency - Switching:	50kHz ~ 500kHz
Base Part Number:	ISL6551
Supplier Device Package:	28-QFN (6x6)
Package / Case:	28-VQFN Exposed Pad
Operating Temperature:	0°C ~ 85°C (TA)
Control Features:	Current Limit, Dead Time Control, Enable, Soft Start
Serial Interfaces:	--
Clock Sync:	No
Synchronous Rectifier:	Yes
Duty Cycle (Max):	50%
Series:	--
Voltage - Supply (Vcc/Vdd):	10.8 V ~ 13.2 V
Output Phases:	1
Number of Outputs:	1
Topology:	Full-Bridge
Output Configuration:	Positive, Isolation Capable
Function:	Step-Up/Step-Down
Output Type:	Transistor Driver
Part Status:	Obsolete
Packaging:	Tube

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Introduction

ISL6551IRZ is a DC/DC controller integrated circuit (IC). It is designed to provide a high efficiency and reliable voltage regulation to operate in a wide input voltage range and operate in noise-sensitive applications. It is capable of achieving high efficiency operation up to 95.2%, making it an excellent choice for power sensitive applications. This circuit has many useful features, such as multiple output voltage settings, current and temperature protection, forced PWM, adjustable switching frequency, soft-start and other advanced power management features.

Applications

ISL6551IRZ is widely used in a variety of applications, such as handheld and battery powered electronic products, portables, notebook computers, digital cameras, industrial and telecom equipment, DC/DC switching supplies, automotive applications and other energy efficient solutions. With its high efficiency and low power consumption, this DC/DC controller is suitable for many varieties of demanding applications.

Working principle

The ISL6551IRZ has multiple integrated circuit blocks that permit it to be used as a DC/DC power source, or as a DC/DC switching controller. It works by comparing a feedback voltage corresponding to the output voltage to a reference voltage, and then initiating pulse-width modulation (PWM) using a voltage regulator as the output. The PWM control signal is then sent to the output stage to regulate the switch openings and release or reduce sufficient power to control the output voltage.

Advantages

One of the main advantages of the ISL6551IRZ is its high efficiency rating. It is capable of reaching as high as 94.3%. This high efficiency is also accompanied by a low power consumption, providing a longer battery life for portable devices. Additionally, this DC/DC controller also features multiple output voltage settings, adjustable switching frequency, forced PWM, current and temperature protection, and other advanced power management functions. All this allows the user to customize the power delivery according to the user\'s needs.

Limitations

While this is an impressive DC/DC controller, it still faces some limitations. The main limitation is that it only works with a single voltage setting, making it unsuitable for applications requiring multiple voltage settings, or applications where the desired output voltage must be adjusted frequently. Additionally, while it is capable of achieving high efficiency, it is still not as efficient as some other DC/DC controllers available on the market.

Conclusion

ISL6551IRZ is an excellent DC/DC controller for power-sensitive applications. It features a wide input voltage range and high efficiency operation up to 94.3%. Additionally, it has multiple output voltage settings, current and temperature protections, and other advanced power management features. While it has some limitations, such as being unsuitable for applications requiring multiple voltage settings, and being less efficient than some other DC/DC controllers, it is still an excellent choice for applications requiring reliable, efficient and cost-effective power delivery.

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