MAX798ESE+

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Introduction

The MAX798ESE+ is a low-cost, non-synchronous, step-down DC-DC controller with a wide 8V to 44V input voltage range. The features of the MAX798ESE+ include a fixed-frequency PWN current-mode control, low quiescent current, low external components count, and fast current-mode transient response.

The MAX798ESE+ is ideal for use in a variety of DC-DC voltage regulator applications, including automotive applications. It can provide up to 8A of continuous current with equal current across the synchronous rectifiers. In addition, the MAX798ESE+ comes with integrated frequency foldback, thermal shutdown and wide supply voltage operation.

Applications

The MAX798ESE+ is designed to offer the cost and performance benefits of a synchronous buck regulator in a low-cost, easy-to-use, non-synchronous buck design. It can be used in a variety of DC-DC regulator applications, including:

• Power converters and automotive applications
• Battery-operated and portable chargers
• PC motherboards, server boards, and systems
• Mobile phones, medical devices, and wearable electronics

Working Principle

The MAX798ESE+ features an internal PWM regulator which switches the output voltage with a fixed frequency in order to regulate the output voltage. When the output voltage is lower than the setpoint, the PWM controller switches the output voltage to a higher band, allowing current to flow through the synchronous rectifiers.

The MAX798ESE+ also includes an external voltage sense line, which allows the maximum output voltage to be adjusted via external resistors. The MAX798ESE+ also includes a frequency foldback feature which reduces the operating frequency of the PWM controller when the output voltage drops below a certain level or the current increases above a certain level. This helps to keep the device from overheating and improves the overall efficiency.

Benefits

The MAX798ESE+ offers several benefits, including:

• Low cost: The MAX798ESE+ is designed to offer the cost advantages of a synchronous buck regulator in a convenient, low-cost, easy-to-design, non-synchronous buck design.
• High efficiency: The MAX798ESE+ has an efficiency of up to 94%, making it ideal for high-efficiency applications.
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• Low external components count: With the MAX798ESE+, only a few passive components are needed for the voltage regulation circuit.
• Wide supply voltage operation: The MAX798ESE+ can operate from an input voltage range of 8V to 44V.
• Integrated frequency foldback: The MAX798ESE+ features a frequency foldback feature which reduces the operating frequency of the PWM controller in the event of an overcurrent condition or when the output voltage drops below a certain level.

The MAX798ESE+ is a versatile, low-cost DC-DC controller that is suitable for a variety of power converter and automotive applications.

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