MIC29712BT

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MIC29712BT Application Field and Working Principle

The MIC29712BT is a special purpose voltage regulator from Micrel Semiconductor, designed to operate over a wide input voltage range from 1.8 V to 5.5 V, making it particularly useful for low-power digital and analog applications. This voltage regulator is designed to provide accurate and reliable output voltages for digital controllers, signal conditioning ICs, and other high performance analog components.

The MIC29712BT is a non-synchronous fixed-voltage regulator that is capable of providing low dropout output voltages while still minimizing the input-output voltage differential. This voltage regulator features a low minimum input voltage requirement and excellent transient response. Additionally, the MIC29712BT features a wide operating temperature range and is optimized to provide low power consumption with high efficiency. The MIC29712BT also offers a wide range of protection functions, such as over-current protection, reverse-current protection, and thermal shutdown, ensuring it runs safely and reliably.

The MIC29712BT has a variety of applications. It can be used for providing core voltage for CPU, DSP, FPGA, and other digital control ICs. It can also provide voltage for analog signal conditioning circuits, such as filter circuits, low noise amplifiers, and RF transceivers. Additionally, it can be used for power-supply solutions for wireless local area networks, Bluetooth, Zigbee, and other low power wireless applications.

Working Principle

The MIC29712BT operates in a non-synchronous buck mode, converting a wide input voltage range (1.8V-5.5V) into a regulated output voltage. This voltage regulator uses an internal MOSFET to switch the input voltage to the required output voltage. The MOSFET is controlled in Pulse Width Modulation (PWM) mode, meaning that it pulses on and off in response to changes in the input or output voltage. When the voltage regulator senses that the output voltage needs to be adjusted, it pulses the MOSFET and adjusts the on-time to reach the desired output voltage. This process is known as pulse-width modulation.

The MIC29712BT works by first regulating the input voltage through an internal control block. This control block is designed to maintain output voltages within a narrow margin by monitoring the input and output voltages and supplying the appropriate corrections. If a voltage difference is detected, it adjusts the duty cycle of the internal MOSFET to the desired output voltage. The pulse-width modulation control loop then adjusts the MOSFET’s switching frequency to maintain the output voltage. The MIC29712BT features a wide output voltage range and is capable of providing accurate and reliable output voltages.

Conclusion

The MIC29712BT from Micrel is a special-purpose voltage regulator designed to provide low dropout input voltages and reliable outputs for digital and analog components. It operates in a non-synchronous buck conversion mode, converting a wide input voltage range into a regulated output voltage. The MIC29712BT is optimized for low power consumption and offers a wide range of protection functions, including over-current protection, reverse-current protection, and thermal shutdown, making it an ideal choice for low-power digital and analog applications.

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