MIC2183BQS-TR

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The MIC2183BQS-TR is a monolithic, high voltage, integrated circuit (IC) controller specifically designed for DC-DC buck (step-down) converter topology applications. It is part of the PMIC - Voltage Regulators - DC DC Switching Controllers group. This type of voltage regulator contain variable and fixed output voltage regulator designed to supply a fixed DC output voltage from a variable DC input voltage. This MIC2183BQS-TR is designed to minimize external components, minimize external inductor ripple current, and provide better transient response, using a novel fixed frequency, constant on-time, open-loop control scheme.

The MIC2183BQS-TR provides an accurate 5V, 2.4A maximum output drive for logic level applications and very fast loop response times. It uses an input voltage up to 20V, 2ms soft-start, and hysteretic overvoltage protection. It has an integrated MOSFET driver to provide a higher current drive capability, and a wide range of PWM switching frequency and voltage output options. It permits differential amplifiers for input voltage sensing, controller loop protection and internal protection features.

The MIC2183BQS-TRis a versatile, cost-effective DC-DC voltage regulator/controller operating with a high maximum switching frequency and integrated MOSFET driver with a wide range of operational flexibility to meet system requirements. This IC operates at constant on-times with a combination of a buck regulator and current-mode control allowing simple design, fast transient response and an excellent stability with an external inductor.

One of the many benefits of a controller like the MIC2183BQS-TR is its over-voltage protection feature, which ensures the output voltage is held within a safe range. This type of protection is important to prevent over-voltage damage and to provide a stable voltage supply. The IC also has adjustable hysteretic over-current protection, ensuring that the current does not go above a certain level.

The MIC2183BQS-TR features constant on-time control to minimize the output ripple and a wide range of adjustable voltage range up to 20V. It includes features such as differential amplifiers for input voltage sensing, automatic self-start sequence, internal programmable soft-start, OVP with hysteretic behavior, adjustable fixed switching frequency and integrated MOSFET driver. It also supports adjustable system-level over current protection and active loop control.

The MIC2183BQS-TR works by sensing the output voltage of the buck regulator and using a voltage-mode loop to regulate the duty cycle of the internal MOSFET driver. When the feedback voltage exceeds the reference voltage, the control loop kicks in, signaling the internal MOSFET driver to turn off, reducing the voltage. The value of the duty cycle is calculated by the constant on-time feature, which is determined by a certain set of internal parameters. This tailored control enables the device to maintain accurate regulation over a wide range of input voltage, load current and switching frequency values.

Overall, the MIC2183BQS-TR device is an ideal choice for single-supply applications requiring power management and adjustable voltage range, while minimizing external components and efficiently passing a wide range of currents. Its wide operating voltage and integrated MOSFET driver allow the device to easily control many different loads while being able to stand up to extreme conditions. Finally, its built-in over-voltage protection and adjustable hysteretic over-current protection ensure optimal safety and reliability.

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