MAX5035AUPA+

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MAX5035AUPA+ Application Field and Working Principle

Introduction

The MAX5035AUPA+ integrated circuit (IC) provides a complete, precision, step-down current-mode power supply design solution for the full range of microcontrollers and digital signal-processing (DSP) systems. It is part of the PMIC - Voltage Regulators - DC DC Switching Regulators class of product. The device features a single Pulse-Width Modulation (PWM) controller, achieving, up to 92% efficiency. With an all-ceramic output capacitor and a synchronizable switching frequency, it reduces board size, cost, and good power supply regulation.

Application Field

The MAX5035AUPA+ is an ideal solution for advanced embedded system power requirements due to its excellent integration, flexibility and accuracy. The device ensures maximum efficiency and reliability in IoT, Automotive, Industrial, and Smart Home applications.

Features

• Wide Input Voltage Range: 4.5 V to 16 V
• Integrated Output Discharge Capability: Provides rapid output voltage discharge when disabled
• Frequency Adjustability: Adjustable switching frequency (within the range of 300 kHz and 1.2 MHz)

Working Principle

To accomplish the step-down conversion, the MAX5035AUPA+ uses two main building blocks consisting of the Pulse Width Modulator controller and the synchronous MOSFET (Metal-Oxide Semi-Conductor Field Effect Transistor) gate driver, which are used in the power conversion circuit.

The controller is a Pulse Width Modulator (PWM), which operates in a voltage mode, allowing adjusting of the output voltage using a feedback loop that compares the output voltage to a reference voltage. The controller also provides a clock signal that produces a Pulse Width Modulated output signal to the gate driver. This signal is essentially a square wave that turns the MOSFET transistors on and off. This, in turn, regulates the power supply output voltage in accordance to the load.

The synchronous MOSFET gate driver is composed of two stages, known as the high side and low side driver. The low side driver controls the low side MOSFET while the high side driver switches the high side MOSFET. Both drivers are used to ensure the load current passes through the switching circuit to obtain desired output voltage.

The MAX5035AUPA+ includes several additional features to enhance performance and reliability. These include soft-start, adaptive output discharge, skip/burst mode operation and fault protection. Soft-start is used to reduce inrush current, adaptive output discharge decreases output voltage immediately when disabled, skip/burst mode operation reduces idle current, and the fault protection circuit shuts down the output voltage in case of an overcurrent or overtemperature event.

Overall, the MAX5035AUPA+ step-down DC-DC power supply controller provides excellent features, performance and integration for embedded systems, making it the ideal choice for a wide range of applications.

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