MIC2145BMM-TR

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MIC2145BMM-TR Application Field and Working Principle

The MIC2145BMM-TR is a micropower dual high side switch designed to be used in a wide range of motor control, appliance and general-purpose switching applications. The device is characterized for operation from –40°C to 85°C and is available in BGA and SOT-23 packages. The MIC2145BMM-TR is fully protected against reverse polarity and has automatic current-limiting shutdown with fault signal.

The MIC2145BMM-TR switch is best suited for high side switching applications in which the load must be electrically isolated from the input voltage level. Common applications include general-purpose relay replacement, automotive door/window lock switch drive, door light switch drive, diode protection, font panel switch protection and contactless power or signal switch applications.

The MIC2145BMM-TR consists of two differential high side switches and control logic to provide full control and diagnostic features. The integrated circuit features a low on-resistance P-channel MOSFET connected between the supply voltage rail (VBAT) and the load for switch control. This low on-resistance allows for low power loss during operation and helps protect the circuit from excessive power dissipation. The MIC2145BMM-TR also includes an integrated voltage regulator that provides a stable supply voltage for the control logic and overcurrent protection.

The working principle of the MIC2145BMM-TR is based on the use of a low-side MOSFET as the switch, which is connected to the supply voltage rail (VBAT). The MOSFET is used to control the current flow through the load. If the control logic detects an overcurrent condition, then the low-side MOSFET goes into a low-impedance state, thus preventing any further current flow through the load. This protects the device and circuitry from short circuit conditions.

The MIC2145BMM-TR offers a variety of features such as adjustable output current limit, over-temperature protection, reverse polarity protection, overvoltage protection, interlock input protection and protection for false on/off signals. All of these features help ensure that the device is safe to use in a variety of applications.

In summary, the MIC2145BMM-TR is a dual high side switch designed to be used in a wide range of motor control, appliance and general-purpose switching applications. The device is characterized for operation from –40°C to 85°C and is available in BGA and SOT-23 packages. The device consists of two differential high side switches and control logic to provide full control and diagnostic features. The device also includes an integrated voltage regulator, adjustable output current limit, over-temperature protection and overvoltage protection.

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