MAX17532ATB+T Integrated Circuits (ICs)

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Maxim MAX17532ATB+T is a DC-to-DC voltage regulator designed for a wide range of applications. The device is a step-down current-mode DC-DC converter with a wide operating temperature range. It is well-suited for a variety of applications such as portable medical devices, industrial equipment, battery-operated end equipments, power tools, and telecommunication systems.

The MAX17532ATB+T integrates a low-side MOSFET and high-side MOSFET with a controller and logic with an operating supply range of 9V to 80V VDD. It is available in a 3.5 mm x 6.5 mm, 8-lead TDFN-EP package and supports up to 1 A output current over the same operating supply range. In addition, it features high-efficiency, low quiescent current, low noise, and integration of the compensation components. The regulator also provides a wide set of programmable functions including enable control, soft-start, pull-down, output overcurrent protection, lossless current-sense, voltage tracking, and output overvoltage protection.

The MAX17532ATB+T is designed to reduce the system cost and printed circuit board size by replacing an entire discrete power-supply system with a single integrated solution. It is capable of generating regulated outputs ranging from 0.8V to VDD, regulated by the FB pin voltage. The device also offers high-efficiency power conversion over the entire load range and allows the system to deliver the highest efficiency across the widest range of output currents.

Working Principle of the MAX17532ATB+T
At its most basic level, the MAX17532ATB+T is a current-mode DC-to-DC voltage regulator. This type of power converter uses the inductor in the feedback loop to generate a voltage change in the output filter capacitor. The current at the inductor is proportional to the output voltage and is set by the PWM control circuit.

The MAX17532ATB+T features an adaptive on-time (AOT) control architecture that provides fast transient response and an adjustable switching frequency with excellent loop stability over a wide range of input voltage and output load conditions. The operation of the device is monitored using a voltage feedback loop with an integrated error amplifier. The error amplifier is used to compare the output voltage feedback to the internally generated reference voltage and adjust the AOT accordingly.

The PWM comparator then compares the error voltage to an external voltage generated by an oscillator and a saw-tooth current. The MAX17532ATB+T operates in a fixed-frequency peak current-mode control scheme. The inductor current is monitored and limited by a lossless current-sensing circuit that has a minimum internal current limit of 600 mA.

The device is enabled by the external EN pin and can be disabled by shooting the EN pin low. When enabled, nodes at the on-time control senses the current flowing through the external inductor and sets the on-time of the switching FET to maintain the output voltage. This start-up occurs only once and is followed by frequency-folding of the on-time to produce the fixed-frequency PWM control. For maximum efficiency, the device can be configured to enter pulse-skipping mode during light-loads.

The device is also equipped with several features such as soft-start, output overvoltage protection, and output overcurrent protection. The soft-start prevents inrush current at start-up and is helpful in reducing the output voltage ripple. Output overvoltage protection is used to protect the device against overvoltage faults and the output overcurrent protection protects the device and connected components against overcurrent faults.

In conclusion, Maxim MAX17532ATB+T is a DC-to-DC voltage regulator designed for a wide range of applications. The device offers a wide set of programmable functions including enable control, soft-start, pull-down, output overcurrent protection, lossless current-sense, voltage tracking, and output overvoltage protection. It features high-efficiency, low quiescent current, low noise, and integration of the compensation components.

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