MAX8577EUB+T

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The MAX8577EUB+T is a high-performance integrated DC/DC switching controller and regulator targeted for a variety of applications. It provides a low-cost, easy-to-implement solution for a variety of power conversion schemes. With extended input voltage ratings from 10V to 24V and output power ratings up to 25W, the MAX8577EUB+T is ideal for applications such as LED lighting, motor control, solenoid and valve control, robotics and communications. The MAX8577EUB+T also provides voltage and current limit protections, as well as programmable MOSFET gate drives.

Overview

The MAX8577EUB+T is a pin-compatible version of the MAX8577EUB, which provides many of the same features, but is optimized for higher efficiency and increased power capability. The MAX8577EUB+T is designed for operating/control frequency flexibility and optimized for operation as a current-mode step-up/step-down, a synchronous boost, or a synchronous fly-back controller. The device features wide reference voltage operation, low reset threshold, a wide dropout voltage rating, programmable switching frequency and crossover frequency, and the ability to directly drive the MOSFET gates with either logic level or TTL signals to provide optimized power savings and improved efficiency.

Block Diagram

The MAX8577EUB+T is a high-performance integrated DC/DC switching controller and regulator with a wide variety of functions. It includes an integrated power monitoring system and power control circuit. The controller includes a power-on reset circuit, a wide-range of current-mode PWM control triggered by a Low Side Oscillator (LOS) signal, programmable crossover frequency, adjustable switching frequency, over voltage protection and voltage and current limit protection. The device provides an adjustable power-on reset circuit output and TTL-level MOSFET gate drive signals.

Application Fields

The MAX8577EUB+T DC/DC switching controller and its variants are ideal for a variety of applications, such as LED lighting, motor control, solenoid and valve control, robotics and communications. It is also suitable for applications requiring small size and low quiescent current.

Working Principle

The MAX8577EUB+T is designed for programmable switching of multiple phases. The device operates by controlling two high-side and two low-side N-channel MOSFETs. In a standard input/output control topology, the MAX8577EUB+T steps up or steps down the voltage between the input and output depending on the setting of the external components. The device includes a pulse-width modulation (PWM) controller, an oscillator and high-side drivers to initiate the switching of the two high-side and two low-side MOSFETs.

The device uses direct current measurements to sense its operating conditions, and indirectly control its operating frequency and duty cycle as required. It also features a reset circuit for accurate control during startup and under-voltage protection. The device can be externally programmed to support a wide range of operating frequencies and duty cycle ranges to support a variety of different topologies and approaching efficiencies. The MAX8577EUB+T also provides programmable current limit and over voltage protection to ensure a safe, reliable operation.

Conclusion

The MAX8577EUB+T is a optimized, high-performance integrated DC/DC switching controller and regulator targeted for a variety of applications. It provides a low-cost, easy-to-implement solution for a variety of power conversion schemes. The device includes a pulse-width modulation (PWM) controller, an oscillator and high-side drivers to initiate the switching of the two high-side and two low-side MOSFETs. It is suitable for applications requiring small size and low quiescent current, such as LED lighting, motor control, solenoid and valve control, robotics and communications.

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