ISL85402IRZ

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The ISL85402IRZ is a highly efficient, dual-output, synchronous buck controller that provides highly precise output voltage regulation. It is an efficient, low-cost solution for many applications, including portable and embedded products, industrial communications, and server systems.

Overview

The ISL85402IRZ is an ultra-low quiescent current, high efficiency synchronous buck controller. It operates over a wide input voltage range of 4.5V to 38V and provides two regulated power outputs. It is designed to minimize noise and resist output voltage ripple. It also offers adjustable current limits as well as output voltage margining and sequencing functionality. The controller also benefits from a high frequency transient response, making it well suited to high-speed step-down applications. Additionally, it features an adjustable soft-start and over-temperature protection.

Features

• 16V to 38V input voltage range
• 4.5V to 15V regulated output voltage with 0.7V accuracy
• Dual forward or buck converter with programmable operating frequency between 200kHz and 2.2MHz
• Integrated high-side and low-side 60mΩ MOSFETs
• Variable current limit; adjustable from 2A to 8A
• Power good-output for master and slave
• Programmable soft start
• Power sequencing
• Adjustable output voltage margining

Applications

The ISL85402IRZ is suitable for a wide range of applications, including those that require multiple output voltages. These include mobile and embedded systems, servers, industrial communications, and automotive applications. It can be used to provide power to a variety of components, including FPGAs and ASICs, DDR3/4 memory, and processor cores.

Working Principle

The ISL85402IRZ controller works by regulating the output voltage of two sets of output power rails. It uses a two-phase buck converter circuit composed of an external MOSFET and a control circuit. The MOSFET operates alternately between two power rails and is connected to each of the outputs via a PWM signal. The output voltage for each of the power rails is then regulated by the control circuit. This can be achieved by modulating the duty cycle of the PWM signal, and thus the of the MOSFET. Additionally, the controller can also margin and sequence the output voltages, as well as protect against over temperature, over-current, and short-circuit conditions.

Conclusion

The ISL85402IRZ dual output synchronous buck controller offers a highly efficient, low-cost solution for a variety of applications. It is designed to minimize noise and resist output voltage ripple. Additionally, it offers adjustable current limits, power sequencing, adjustable soft-start, and over-temperature protection. It is suitable for a wide range of applications, including mobile and embedded systems, servers, industrial communications, and automotive applications.

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