MC34167D2TR4G Integrated Circuits (ICs)

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MC34167D2TR4G (an integrated switching regulator) is a PMIC (power management integrated circuit) fabricated from BCD6s process and available in a 4-lead SOT-23 package. It is part of a family of devices from ON Semiconductor that are categorized as voltage regulators and more specifically, DC-DC Switching Regulators. The purpose of a DC-DC regulator is to transform a source voltage to an output voltage, achieving a desired current level. This particular device provides an output voltage adjustable from 1.5 V to 6.8 V and has a peak output current up to 1.2 A through an external MOSFET.

At the heart of MC34167D2TR4G lies a current-mode PWM (pulse-width modulation) controller, which is a type of voltage regulator that is engineered to regulate output voltage regardless of line or load. With an operating input voltage range from 3V to 36V, the MC34167D2TR4G can be applied to a broad range of AC-DC and DC-DC applications.

The MC34167D2TR4G inherently offers cycle by cycle current limit and has built-in protection features such as under voltage lockout, current limit, and over temperature protection. The device features a wide range of features, such as soft-start, frequency synchronization, and burst mode operation, making it ideal for battery-operated consumer and industrial applications.

The working principle of the MC34167D2TR4G is based on the operation of a pulse-width modulation (PWM) controller. The PWM controller is responsible for regulating the power output and achieving a desired current level. The PWM compares an internally-generated reference voltage to the output voltage feedback and adjusts the duty cycle output accordingly. The output voltage is kept constant despite variations in line and load conditions.

The output voltage is determined by a voltage divider of resistors connected between the device’s reference pin (VREF) and the output pin (VOUT). The voltage at the output is set by making adjustments to the value of one of the resistors. An external gate driver must be used to supply the gate drive current to the external MOSFET. When the device activates its output switch, the voltage across its drain-source will start to decrease and the current flowing through the switch will increase.

In summary, MC34167D2TR4G is a versatile PMIC with a wide range of features. It is typically used in AC-DC and DC-DC applications that require a precise output voltage, adjustable over a wide range. Its built-in protection features, such as undervoltage lockout, current limit, and over-temperature protection, make it an ideal candidate for battery-operated consumer and industrial applications. The device uses a PWM-based current-mode control architecture to regulate output voltage, revising its duty cycle automatically based on input and output voltage conditions.

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