L6920DTR Integrated Circuits (ICs)

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L6920DTR is a monolithic integrated circuit power management device, belonging to the category of PMIC - Voltage Regulators – DC DC Switching Regulators. The application field and working principle of L6920DTR will be covered in this article. The primary application of L6920DTR is to protect and control voltage in automotive, industrial, and communication systems. It is designed to be used as an adjustable (from 3V to 40V) Buck-Boost switching regulator and contains a built-in low-side MOSFET driver, enabling an application to work in buck or boost mode. The intended purpose of the L6920DTR is to provide a stable power supply output voltage and reliable protection against over-current and short-circuit. The working principle of the L6920DTR is based on the buck-boost topology where the output voltage is regulated by varying the duty cycle of charging period with respect to the basic switching frequency. The device features an on-board pull-down voltage divider which allows the user to adjust the comparison voltage. This comparison voltage between the output sense voltage and the reference voltage level is used by the internal logic circuitry to regulate the output voltage. The L6920DTR has two input pins, namely Vin and VBoost, from which the device can receive power. Vin is the normal supply input, where the input voltage range depends on the device family selected (ranging from 3V to 40V). VBoost is an auxiliary input which can be used to supply current to the output when the Vin voltage drops below a certain value, thus allowing the device to support voltage input transient conditions. The L6920DTR also has two output pins, Vout and FB, interconnected by an integrated low-side N-MOSFET. In the buck mode the current flows from Vin to Vout, while in boost mode it flows from VBoost to Vout. By controlling the duty-cycle of the switch, the device can regulate the output voltage to a set value. The feedback signal from the output is then sent through the FB pin back to the PWM block, so that the voltage can be maintained at the desired level. The L6920DTR integrates various protection features such as over-current protection (OCP), over-voltage protection (OVP) and under-voltage protection (UVP). The OCP circuit will automatically shut off the current flow whenever the load current surpasses a certain threshold, thus avoiding possible damage or destruction of the load. The OVP circuit will shut off the current flow when the output voltage reaches a level higher than the user-defined threshold. The UVP circuit will also detect a low output voltage level and shut off the current flow. As a final note, the L6920DTR is an ideal solution for a variety of automotive, industrial, and communication systems applications requiring voltage regulation and protection. The applied buck-boost topology and integrated protection circuits ensure the system stability, reliability and safe operation.

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