TDA21301

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PMIC (Power Management ICs) are components designed with the aim of managing the power consumption of an electronic device or system. Voltage regulators enable the consistent flow of current and voltage to various components and parts of a device or system, and special purpose voltage regulators are designed to cater to a specific purpose. TDA21301 is one of these special purpose voltage regulators, and this article will discuss its application field and working principle.

Application Field of TDA21301

Power supply systems face the challenge of managing both the level of input voltage and the load voltage. This is made even more difficult when the system has to provide power to varying or moving loads, as the system must constantly adjust to changing conditions. To address this challenge, Texas Instruments released the TDA21301, which is a voltage regulator capable of controlling both output voltage and current.

The TDA21301 is a single-channel, synchronous step-down DC-DC converter that operates in a range between 4V and 28V input voltage, and between 0.6V and 25V output voltage. It also has a minimum 3A output current and a maximum switching frequency of 1.2MHz. Moreover, the TDA21301 features an adjustable peak current mode control, and can provide a very precise output voltage regardless of changing load conditions. This voltage regulator is suitable for applications such as adjustable power supplies, embedded systems, and portable devices.

Working Principle of TDA21301

The TDA21301 voltage regulator uses two switches to control both the output voltage and current. When providing input voltage, the high-side MOSFET switch (named HS or HP in the diagram) turns on, and the output of the switch is applied to the inductor through a current sensing resistor. The inductor will begin to store energy and create a magnetic field, in order to increase the current to the output capacitor. The low-side MOSFET switch (LS or LP) is then turned on and off in order to regulate the voltage on the capacitor. The output current is sensed by a current sensing resistor and used to control the on/off cycle of the low-side MOSFET.

When controlling an adjustable power supply, the peak current mode of the TDA21301 can be used to manage the output voltage. This mode allows the user to adjust the peak value of the output voltage by varying the peak current setting of the voltage regulator. This peak current setting will then be compared to the sensed current value sensed by the current sensing resistor, and if the sensed value is greater then the peak setting, then the low-side MOSFET switch will be shut off for a short period of time in order to regulate the output voltage.

Conclusion

The TDA21301 voltage regulator from Texas Instruments is a special purpose device, designed to control both the output voltage and current of a power supply system. It is suitable for a wide range of applications and features adjustable peak current mode control. This voltage regulator works by using two switches to turn on and off the output of the power supply system, and by controlling the on/off cycle of the low-side MOSFET based on the peak current setting.

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