MAX8646ETG+

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The MAX8646ETG+ is a high-level point-of-load or on-board dc-dc converter and power-management IC (PMIC). It integrates a buck controller, 2-A power MOSFETs, switching power FETs, and two independent linear regulators.

The MAX8646ETG+ can provide a wide range of output voltage, current and power levels, making it suitable for many applications. Its advanced features, such as automatic switching between PWM and PFM modes, and programmable soft-start, enable advanced power management capabilities. Its low quiescent current consumption and excellent thermal characteristics make it an attractive option for battery-powered and low-power applications.

Application Field

The MAX8646ETG+ is commonly used for powering small processor core supply, display and camera modules, many small and medium size LED backlights and power amplifier applications in the mobile and consumer industry. It can also be used in a variety of industrial, medical and automotive applications.

Working Principle

The MAX8646ETG+ is a buck converter – a controller that uses Pulse Width Modulation (PWM) to switch the power FETs in order to reduce the output voltage from its input voltage. As a switching voltage regulator, it also has its power dissipation requirements, which is determined by the ratio of its input voltage to output voltage and output current. As the output current increases, the power dissipation increases, and the internal temperature increases.

The MAX8646ETG+ can operate in either continuous PWM mode or pulse-frequency modulation (PFM) mode. The chip automatically switches between the two operation modes based on the demanded output current. PWM mode is used when larger output power is required while PFM mode is used under heavy load conditions. By adjusting an internal soft-start time during startup, current surges can be minimized during power-up. The MAX8646ETG+ also monitors and maintains a fixed switching frequency over an adjustable output voltage range, enabling efficient and repeatable power-conversion performance.

Overall, the MAX8646ETG+ provides a highly efficient, cost-effective switch-mode regulator with both continuous PWM and pulse frequency modulation (PFM) control schemes. Its advanced features and low quiescent current consumption make it an ideal option for low-power applications.

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