MAX8877EUK18+T

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The MAX8877EUK18+T is an integrated linear voltage regulator that is designed to provide higher efficiency and smaller size for various consumer electronics applications that range from the audio to gaming sector. It is a fixed-voltage regulator that offers low dropout and low noise performance up to 1.5A and up to 4.5V output with adjustable current limit and thermal reset. This device is able to operate from a single 2.5V to 5V input voltage and operates over a wide temperature range of -40 to +125°C.

Features and Benefits

• High efficiency regulator reduces power loss and acoustic noise
• Low dropout, low noise regulator up to 1.5A
• Operates over a wide temperature range of -40 to +125°C
• Integrated LDO and current-limit circuit easily tailored for multiple applications
• Sleep mode and a low load current of ≤8μA
• Special thermal shutdown/current limit circuit prevents any over temperatures
• Low quiescent current in sleep mode of ≤ 8μA
• Soft-start circuit ensures smooth supply of power to the system
• Over-current protection prevents the device from any unexpected surge and overheating
• Short-circuit protection from up to 4mA output current
• Internal current limit circuit with adjustable limit detects and prevents any damage from over-circuit input current
• Simple power shutdown by output enable pin

Application Field

MAX8877EUK18+T is widely used in audio, gaming, computing, automotive, and industrial equipment. The device\'s wide temperature range and on-board protection circuits make it suitable for these applications. It is included in portable media players and their associated accessories such as speakers, monitors, and headphones. Additionally, MAX8877EUK18+T is useful in simple voltage regulation applications that require low power consumption, such as mobile phones, personal digital assistants (PDAs), gaming consoles, and automotive displays.

Working Principle

When power is applied into the special linear regulator circuit, the voltage is reduced via the series pass element and delivered to the output. The series pass element is composed of the power transistor and control circuits that are controlled by the error amplifier. The integrated error amplifier is responsible for the regulation of output voltage. The voltage applied to the error amplifier is the difference between the reference voltage generated by the bandgap reference and the feedback voltage at the output. When the feedback voltage is larger than the reference voltage, the current flow through MOSFET will decrease, thus decreasing the output voltage. When the feedback voltage is lower than the reference voltage, the current flow through MOSFET will increase, thus increasing the output voltage.

The current-limit circuit is integrated together with the error amplifier in order to protect the device from current overload. The input current of the chip will be limited when the current exceeds the fixed current limit (4mA).The other important protection circuit is the thermal protection circuit that protects the device from over-temperature condition. It will begin to shut down the system when the temperature exceeds a certain value, and then re-enable it automatically when the temperature returns to the normal range.

In addition, the MAX8877EUK18+T includes a soft start circuit that eliminates excessive voltage during startup. This feature reduces output voltage surges which can damage system components. MAX8877EUK18+T also features a sleep mode that allows the device to enter a low power stand-by state when system power is turned off. This feature is especially useful for portable devices as it reduces power consumption and extends battery life.

Conclusion

The MAX8877EUK18+T is a versatile linear voltage regulator developed to meet a variety of consumer electronics application needs. It can operate in environments up to 125°C and is rated to 1.5A output with adjustable current limit and thermal reset. It also includes an integrated LDO and current-limit circuit, sleep mode, soft start and over-current protection schemes. With these features, the MAX8877EUK18+T is the ideal voltage regulation solution for audio, gaming, computing, automotive, and industrial equipment.

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