MAX1557ETB-T

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The MAX1557ETB-T is a synchronous step-down DC-DC converter in a 4mm × 4mm thin Quad Flat No-Lead package from Maxim Integrated. It is a passively cooled DC-DC converter capable of providing up to 5A of continuous current from input voltages from 4.5V to 28V. It features an integrated, low on-resistance, high-frequency power MOSFET for greater efficiency. This efficient boost regulator is optimized for space-limited applications, providing higher performance and more features in a more compact size than competing devices.

The MAX1557ETB-T belongs to the family of voltage regulators and DC-DC switching regulators. It is suitable for multiple power conversion applications, such as communications equipment, industrial equipment, automotive and consumer electronics, and other space-constrained applications, due to its high integration, low profile, and excellent efficiency.

This device is designed to convert voltages between 4.5 V to 28 V input and outputs of 0.7 V to 18 V. The device includes an internal 2.5-V reference and error-amplifier circuitry that simplifies device programming. It also features a low-noise, fixed-frequency, Pulse Width Modulation (PWM) current-mode architecture that allows the device to respond quickly to load transients and provides a stable output voltage over line, load, and temperature variations.

The MAX1557ETB-T also features a programmable soft-start feature that allows the user to set an initial output voltage and an over top-voltage-limit. The output voltage is programmed using external resistors, and the switching frequency can be adjusted to 300 kHz, 400 kHz, 500 kHz, or 600 kHz. Additionally, the device can be shutdown by applying a low voltage to the EN pin, and includes a thermal shutdown current limit feature to protect the device from excessive power dissipation.

The MAX1557ETB-T also includes several additional features. The device comes with a unique interleaved boost circuitry that allows high input-voltage to be converted to high ouput-voltage with minimal power dissipation. This feature allows the device to increase its power conversion efficiency, while also increasing its power handling capabilities. Additionally, it provides improved line and load regulation over competing products.

In addition, the MAX1557ETB-T is equipped with an oscillator-controlled frequency that allows it to maintain consistent levels of switching frequency over temperature variations and different input voltages. It also features a precise 0.5% output voltage accuracy that allows for precise control of output voltage for power management applications. The device is available in a 14-pin, leadless QFN package that provides excellent thermal properties and small form factor in space-constrained applications.

To sum up, the MAX1557ETB-T is a voltage regulator and DC-DC switching regulator that provides a high degree of integration, low profile, and excellent efficiency. It is suitable for a variety of space-constrained power conversion applications, such as communications equipment, industrial equipment, automotive, and consumer electronics. It includes a passive cooling system and an internal 2.5V reference, along with soft-start, over-temperature protection, and load-transient response features. It also has a frequency-controlled oscillator and a precisely accurate 0.5% output voltage accuracy. It is available in a 14-pin, leadless QFN package that provides excellent thermal properties and small form factor in space-constrained applications.

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