MIC2171BT

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The MIC2171BT is a step-down regulator integrated circuit chip manufactured by Micrel, Inc., and is categorized in the family of voltage regulators and DC DC switching regulators. This IC is designed to provide a single, fixed output voltage for applications with limited space. It is used for automotive applications, as well as in portable consumer electronics, where dual-output voltage, low noise levels, and cost effectiveness are important considerations.

This regulator\'s main features include synchronization and an internal ideal diode. Synchronization allows the switching power supply to use a cost-effective crystal oscillator instead of a more costly PLL-based or single-mode-oscillator converter. And with its internal ideal diode, it is possible to remove the external diode during steady-state operation.

The MIC2171BT is a high-performance synchronous step-down regulator, offering efficient and compact power conversion. This IC provides a highly regulated output of stable voltage under varying conditions. Its output voltage range covers 0.6 to 5.5V, with an operating current of up to 1.5A and an integrated accurate power-on reset (POR signal). This regulator chip has a very low quiescent current of just 35µA, among the lowest in the industry.

The MIC2171BT is offered in a small, 5-lead SOT-23 package, and it is available with either a Pb-free, RoHS-compliant or a lead (Pb)-only version. It is optimized for both above and below 1.2V output voltage applications, and it is capable of providing up to 80mA of continuous current with a 0.5V output voltage and up to 1.2A of continuous current with 1.2V output.

In terms of the working principle of the MIC2171BT, it is a synchronous Buck regulator with an internal ideal diode, designed to provide a single, fixed output voltage. It has two main topologies of power conversion, Pulse Width Modulation (PWM) and pulse skip modulation (PSM), which provide different speed/performance and dynamic power-supply regulation characteristics, respectively.

The PWM topology uses a steady frequency, high-resolution PWM signal, fast computational speed, low noise, and good power-supply regulation. Its Pulse-Skip Modulation (PSM) topology is designed to drive the MOSFETs more efficiently, especially when the input voltage is lower than the output voltage and the output current is high. It offers a low-noise, low-dissipation power-supply solution with improved light-load efficiency and reduced output ripple, even under low input voltage.

The MIC2171BT includes programmable features, allowing built-in protection for over-current, over-temperature, and under-voltage lockout (UVLO). Other features include a power-good signal, which indicates when the regulator output is within its specified range, a thermally enhanced package, and an over-voltage protection, which turns the regulator off when the output voltage exceeds the maximum specified level.

The MIC2171BT is an ideal solution for applications where space and cost effectiveness are of vital importance. It offers efficient power conversion, low noise, and excellent power-supply regulation characteristics in compact and low-cost packages.

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