MIC38C42-1BM

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The MIC38C42-1BM is a monolithic switching power supply (SMPS) integrated circuit with a wide range of applications. It is designed as an AC–DC converters, offline switchers, and step-down power supplies in both single and multiple output configurations. This device is particularly suitable for battery-driven applications, since the high efficiency attributed to the integrated synchronous buck converter is helpful in extending the battery life. The device also features low start-up and operate current levels, further optimizing its overall efficiency.

The MIC38C42-1BM integrates three stages: a pulse width modulator (PWM) stage, a driver stage and a high current power stage. In a typical application, the PWM stage takes a DC (Rectified AC) input voltage and produces a regulated output voltage by driving a power switch. The power switch is driven by the driver stage, which applies the necessary current to control the switch. The power stage fits in between the PWM and Driver stages, placing the outputs from the driver stage in series with the power MOSFETs to form two output inductors. The output inductors, along with the output capacitor, form the output filter for the application.

The integrated PWM operates in switch mode. This means that, when the power switch is on, the device operates at a constant frequency and duty cycle. The frequency and duty cycle can be adjusted to meet specific requirements. This allows the MIC38C42-1BM to provide the output at different levels while maintaining the same power transfer. The output inductors allow sufficient energy to be stored in the switching power supply during key periods of operation. When the input voltage falls below a certain preset level, the output inductors also act as a short-term energy source until the input voltage is restored.

The MIC38C42-1BM features an adjustable output voltage and current limit. The PWM section can be programmed to provide constant voltage, current and peak power. The output current limit is adjustable from 0 to 1.5A. This prevents the power switch from experiencing fault conditions when the load current exceeds the maximum value.

The MIC38C42-1BM also integrates a wide range of protection features, including over temperature protection, over voltage protection and over current protection. The device also features a fast two-pole frequency clock inhibited switch that allows the over current protection to react quickly in order to prevent power supply faults from damaging the device. Furthermore, the integrated low bulk capacitance protection prevents the internal dielectric stress from causing catastrophic transistor breakdown.

In summary, the MIC38C42-1BM is a powerful, cost-effective switching power supply integrated circuit with a wide range of applications. It features a high-efficiency synchronous buck converter and is well-suited for battery-driven applications. The device is further equipped with adjustable voltage and current limits, as well as various protection features to ensure its robustness and reliable operation. Thus, this device is an ideal choice for DC-to-DC power conversion in a wide range of applications.

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