MAX17531AUB+

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MAX17531AUB+ is a step-down regulator with internal synchronous MOSFET switch. It integrates several features to enhance transient response and reduce the current ripple count. These features include high-bandwidth, adjustable current limits, internal compensation, current-mode operation, and soft-start/soft-stop functions. It is suitable for point-of-load (POL) applications requiring flexible voltage and current regulation.

Application fields for MAX17531AUB+ include consumer applications such as game consoles and point of sale terminals, rack mount servers and other equipment requiring efficient, small footprint power supplies, embedded system designs, and industrial applications. This product is well suited for automotive applications and has current sinking with up to 500 mA.

The MAX17531AUB+ synchronous step-down (buck) regulator with internal FET switch offers a programmable, constant current output with a wide range of adjustable currents. The device includes a voltage feedback amplifier, reference, and current sense amplifier. A single pin provides for frequency adjustment, allowing adjustment of maximum current limit, and is able to synchronize to an external clock source. The device offers a range of output voltage from 8V to 60V. It can operate from an input voltage range of 4.5V to 65V.

The MAX17531AUB+ operates as a buck regulator, converting input voltages to regulated outputs of up to 60V. This device utilizes a high-frequency synchronous PWM topology allowing for high efficiency power conversion. It\'s output current is sensed by a peak current regulation circuit, providing improved loop stability and transient response. This internal voltage feedback amplifier, which has a gain of 1/2 V per A, compensates for the voltage drop across the internal MOSFET, thus reducing the external compensation components while maintaining accurate dynamic performance.

The MAX17531AUB+ also includes an adjustable maximum current limit feature that allows the designer to reduce the power dissipation in the device, thus improving overall efficiency at heavy load steps. An internal soft-start/soft-stop circuitry allows smooth start-up and shut-down of the output voltage, while also preventing input inrush current. A selectable fixed frequency of up to 1.3 MHz allows the device to be synchronized with an external clock source and to optimize efficiency for a given application. The device has Thermal Shutdown (TSD) and overvoltage protection (OVP) to protect against any operating conditions that exceed the device\'s limits.

In short, the MAX17531AUB+ is a step-down regulator suitable for point-of-load applications requiring efficient, small footprint power supplies. This device meets the needs of various different applications with its adjustable current limits, internal voltage feedback amplifier, reference, and current sense amplifier, adjustable maximum current limit feature, and internal soft-start/soft-stop circuitry. All these features ensure high efficiency power conversion and excellent output voltage regulation. This makes the MAX17531AUB+ the ideal step-down regulator for many power supply applications.

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