MIC2193BM-TR

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DC-DC switching controllers are versatile components that are used to regulate the voltage within electronic circuits. The MIC2193BM-TR is a DC-DC switching controller from Microchip Technology that is designed for DC-DC applications requiring high-accuracy regulation and high-speed transient response. It features a low on-resistance MOSFET output driver and a pulse width modulation (PWM) control input for accurate voltage regulation. This article will discuss the features of the MIC2193BM-TR and its application field, as well as its working principle.

Features

The MIC2193BM-TR is a fully-integrated DC-DC switching controller that provides excellent regulation accuracy and transient response. It includes an output driver with a low on-resistance MOSFET output stage, allowing it to achieve high efficiency in step-down converter designs. It also features a voltage error amplifier with a programmable transconductance amplifier and resistors that can be programmed to optimize loop gain. In addition, the controller provides fault protection features such as programmable current limit and thermal shutdown.

The MIC2193BM-TR also features a wide input voltage range of 4.5V to 42V and a programmable operating frequency from 200 kHz to 600 kHz. It also has a programmable internal soft-start feature, allowing the designer to control the output voltage ramp-up rate. The current mode PWM control approach used by the IC also provides excellent line and load transient response, allowing it to maintain the output voltage within +/-2% of its setpoint.

Applications

The MIC2193BM-TR is an ideal solution for applications that require minimal external components and high-accuracy regulation. It is suitable for a number of low-voltage DC-DC step-down converter designs, including automotive, industrial and consumer applications. In automotive applications, the MIC2193BM-TR can be used to provide a regulated supply voltage for powertrain systems, engine control modules, ABS controllers, and other automotive electronics.

The MIC2193BM-TR is also suitable for industrial power supply designs for motor drives, materials-handling and process-control systems. In consumer applications, it can be used in products such as LCD TVs and screens, gaming consoles, and UPS/battery backup systems. The device is also well-suited for LED lighting applications, where it can be used to control the current for LED strings.

Working Principle

The working principle of the MIC2193BM-TR is based on a voltage mode current-mode Pulse Width Modulation (PWM) control scheme. The PWM output is generated using an internal oscillator, which is then compared to an error amplifier output to program the duty cycle of the PWM signal. The output of the PWM comparator is then fed to the output MOSFET driver, which turns on the MOSFET and allows current to flow through the inductor.

The current in the inductor is then sensed by a current sense resistor, which is used to generate a voltage drop across the resistor. This voltage is then compared to an internally generated voltage ramp, which is used to determine when the MOSFET should be turned off. The on/off timing of the MOSFET is used to regulate the output voltage.

The MIC2193BM-TR also features a number of protection features that increase its safety and reliability, such as programmable current limit, thermal shutdown, and undervoltage lockout. The device also features internal soft start and active cycle-by-cycle current limit, which allow the designer to optimize their solution for the application.

Conclusion

The MIC2193BM-TR is a fully-integrated DC-DC switching controller that provides excellent regulation accuracy and transient response. It features a low on-resistance MOSFET output driver, a current mode PWM control scheme and a wide input voltage range of 4.5V to 42V. With its robust protection features and wide input voltage range, the MIC2193BM-TR is an ideal solution for a variety of DC-DC step-down converter designs, including automotive, industrial and consumer applications.

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