MAX77686EWE+T

PMIC - Voltage Regulators - DC DC Switching Regulators

Introduction of MAX77686EWE+T

The MAX77686EWE+T is a DC-DC switching regulator controller with an integrated FET that is specifically designed to provide a step-down voltage solution with a single inductor. The MAX77686EWE+T is designed to control a variety of DC-DC power supplies with wide input voltage ranges and adjustable outputs.

Features of MAX77686EWE+T

• Wide Input Voltage Range: 0.6V to 5.5V
• Wide Output Voltage Range: 0.8V to 4.5V
• Integrated FET with Current Limit Settings
• OVP, UVP, and OTP
• Soft-Start, Load-Line, and Current-Share Settings
• Reliable Operation at 2.5MHz Switching Frequency

Application Areas

The MAX77686EWE+T is suitable for a variety of applications including laptops, tablets, smartphones, cellular handsets, and other portable products where a step-down voltage is required. The integrated FET helps to simplify the design of power supplies, providing designers with a cost-effective solution for a variety of applications that require high efficiency, reduced component count, and small form factor.

Working Principle

The MAX77686EWE+T uses a single inductor design to provide a step-down voltage conversion. It is composed of an analog PWM controller, an integrated FET, and a number of protection circuits. A high-side PowerMOSFET is used to transfer energy from the input to the output, and a low-side FET is used to control the current. The MAX77686EWE+T operates in either Pulse Width Modulation (PWM) or Pulse Frequency Modulation (PFM) mode to provide a regulated output voltage. It also incorporates a number of protection features, including over-voltage protection (OVP), undervoltage protection (UVP), and over temperature protection (OTP).

The MAX77686EWE+T operates by sensing the voltage on the FB pin and comparing it to an internal reference voltage. If the voltage on the FB pin is lower than the reference voltage, the PWM controller will increase the duty cycle of the high-side FET, resulting in an increase in the output voltage. Conversely, if the FB pin voltage is higher than the reference voltage, the PWM controller will decrease the duty cycle of the high-side FET, resulting in a decrease in the output voltage. This process of adjusting the duty cycle to match the desired output voltage is known as "closed-loop" control. Most DC-DC controllers have an open-loop control mode, which does not use feedback from the FB pin.

The MAX77686EWE+T also has several protection features to prevent damage to the system. Over-voltage protection (OVP) is used to prevent the output voltage from exceeding a certain level, while undervoltage protection (UVP) is used to prevent the output voltage from dropping below a certain level. In addition, the MAX77686EWE+T has over temperature protection (OTP) to prevent damage to the IC due to excessive heat. The MAX77686EWE+T also features a number of other features, including soft-start, load-line, and current-share settings.

Conclusion

The MAX77686EWE+T is a DC-DC switching regulator controller with an integrated FET that is specifically designed to provide a step-down voltage solution with a single inductor. It is suitable for a variety of applications including laptops, tablets, smartphones, cellular handsets, and other portable products where a step-down voltage is required. The MAX77686EWE+T operates in either PWM or PFM mode to provide a regulated output voltage, and incorporates a number of protection features, including OVP, UVP, and OTP. With its wide input voltage range, adjustable output voltage, and integrated FET, the MAX77686EWE+T provides a cost-effective, power-efficient solution for a variety of DC-DC applications.