MIC38C43BMM-TR

MIC38C43BMM-TR application field and working principle

The MIC38C43BMM-TR is a dual-channel high efficiency, step-down DC/DC converter in TO-263 7L package, specifically designed for use in a wide range of lap top, portable and desktop applications. It is a PMIC (Power Management Integrated Circuit) device with integrated DC/DC converters, offering higher efficiency, lower power consumption and reduced system size. The high efficiency performance and the ability to operate in high ambient temperatures make the MIC38C43BMM-TR ideally suited for applications with limited thermal and electrical performance requirements.

The MIC38C43BMM-TR is a dual-channel DC/DC converter operating both in continuous and discontinuous mode, suitable for applications requiring a wide input voltage range. The device features two buck converters, one operating in continuous mode, the other operating in discontinuous mode. Each buck converter has independent current-limit and short circuit protection, an active voltage positioning technology and a fixed frequency operating mode.

The adjustable output voltage ranges from 2.5V up to 5.5V. The MIC38C43BMM-TR has built-in soft start capability and provides a precise output voltage without additional external components. The device has peak current mode control for the limited duration of load transients, allowing the device to react quickly to changing load conditions. The MIC38C43BMM-TR is designed to reduce the external component count and simplify the design of multi-outputs systems.

The MIC38C43BMM-TR is designed to operate from a wide input voltage range of 6V to 18V and provides an output current of up to 2.2A (V_out = 5V). The device features an internal PWM oscillator and an input voltage detector for power-on reset. The MIC38C43BMM-TR is available in a variety of packages, such as PBGA, TQFP and SOIC, to suit a wide range of application environments.

The simplest way to describe the working principle of the MIC38C43BMM-TR device is that it uses an oscillator to rapidly switch the current between the high side transistor and the low side transistor, at a frequency set by an internal pulse width modulation (PWM) controller. This eliminates the need for an external clock and keeps the device self-contained. The RC network connected between the INR and CTL pins modulates the switching frequency of the device.

Basically, the MIC38C43BMM-TR takes the input voltage and converts it into a regulated output voltage. It does this by turning ON and OFF the high side and low side power devices in order to move energy from the input side to the output side. When the high side is turned ON, current is allowed to flow through the energy storage inductor, charging a capacitor on the output side and creating a regulated output voltage.

When the low side is turned ON, current flows out of the storage inductor, across the output capacitor and back to the input side. This \'buck\' principle of operations is used to create constant output voltage regardless of load or input voltage.

Overall, the MIC38C43BMM-TR device is an efficient, cost-effective power management solution for a variety of portable and desktop applications. It provides two dual-channel DC/DC converters with independent current-limits, short-circuit protection, and active voltage positioning technology. It also features an adjustable output voltage range from 2.5V up to 5.5V, and an input voltage range of 6V to 18V. The device is available in a variety of packages, and its internal PWM oscillator and input voltage detector ensure reliable power-on reset.