LMZ21700SILR Power Supplies - Board Mount

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DC DC converters are used to regulate the voltage of a DC current and to convert the current from one voltage to another. The LMZ21700SILR is a step-down DC-DC converter, and its application field and working principle are discussed in this article.

The LMZ21700SILR is a Wide-Voltage/Wide-Temperature, 2-A Buck DC-DC Converter. It has wide input voltage range, up to 38V, and is ideal for automotive, consumer and industrial applications. This device operates from 4.5V to 38V at operating junction temperatures up to 150°C. With a switching frequency of 500 kHz and an output voltage of 0.825V to 23V, it is ideally suited for a wide variety of applications.

In addition to its uses in automotive and industrial applications, the LMZ21700SILR is ideally suited for powering FPGAs and microprocessors, as well as for powering high voltage ASICs and other relatively low current devices. It offers a power savings of up to 36% over typical linear regulators. The device includes integrated MOSFETs, an input UVLO, output over-voltage protection, current limit and thermal shutdown protection.

The LMZ21700SILR is a non-inverting buck converter that uses a synchronous rectifier for higher efficiency and optimal output voltage regulation. It has a high-side N-MOSFET and a low-side P-MOSFET, the input voltage being applied to the anode of the high-side N-MOS, and the output voltage being set by the cathode of the low-side P-MOS transistor. The device employs an on-time control scheme with peak current mode. Its fixed frequency is generated by the use of a voltage-controlled oscillator, where the rate of rise of the ramp voltage is set by the voltage on the reference pin.

The LMZ21700SILR operating frequency is set by the external resistor. As the output voltage is scaled up or down, the operating frequency automatically adjusts based on the selected resistor. In summary, the LMZ21700SILR is an ideal step-down DC-DC converter for providing clean and dependable power to many applications.

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