MAX747ESD+T

Series:	*
Packaging:	Tape & Reel (TR)
Part Status:	Active
Package / Case:	14-SOIC (0.154", 3.90mm Width)
Supplier Device Package:	14-SOIC
Base Part Number:	MAX747

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Introduction to MAX747ESD+T

The MAX747ESD+T is a DC-DC switching controller IC from Maxim Integrated, ideal for powering a wide variety of applications including portable equipments, digital signal processors and cellular phones. This particular device belongs to Maxim Integrated’s High-Speed DC-DC Buck Switching Controllers family. It is a fixed-frequency PWM switch regulator solution with minimal external components, providing flexibility, high efficiency, low design cost and excellent thermal performance.

Performance Characteristics

The MAX747ESD+T is a very power efficient switch regulator controller. It features a maximum duty cycle of 95 percent and a standard switching frequency of 1.2MHz. It is designed to cover a wide 3V to 28V input voltage range, making it suitable for a variety of applications. The device also features a switching frequency modulation function to reduce the switching noise, which is further reinforced by its inherently low output ripple and low operating current requirements. Integrated protection features include thermal and current limit shutdown, allowing for higher load capability.

Typical Application

MAX747ESD+T is a popular choice for many switch regulator designers due to its simple, yet highly efficient design. Typical applications of MAX747ESD+T include portable computers, digital signal processors, cellular phones, and a wide variety of battery powered devices or mobile/automotive applications. Its low input voltage, high output power efficiency, high frequency, wide operating temperature, and fast response time make it well suited for such applications. It is also well suited for stand-alone buck regulator designs and current mode Buck-Boost converters.

Working Principle

The MAX747ESD+T is a buck DC-DC controller based on a Fixed Frequency Current Mode PWM (Pulse Width Modulation) switching scheme. The device applies a fixed frequency signal, which controls the output voltage in proportion to the duty cycle of the signal. The signal is generated by the device itself, but is modulated based on the output voltage, the feedback divider network, and the internal reference voltage. The MAX747ESD+T basically acts like an inverting amplifier, driving the gate of the high-side switch with a PWM signal. The PWM signal adjusts based on the output voltage and the feedback signal from the output side of the circuit. A linear voltage regulator, such as a low-dropout regulator (LDO) is often used as a control element for the device. It serves to condition the feedback signal, providing it with the required accuracy.

Conclusion

The MAX747ESD+T is an effective and reliable DC-DC switching controller from Maxim Integrated, specifically designed to suit many portable, mobile and automotive applications. It is suitable for both stand-alone buck regulator designs, as well as current mode Buck-Boost converters. It features a fixed-frequency PWM switching scheme, integrated thermal and current limit shutdown features, and provides flexibility, high efficiency, low design cost and excellent thermal performance.

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