TPS54627DDAR

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The TPS54627DDAR is a synchronous, wide-VIN, high-efficiency step-down driver-regulator. It supports input voltages up to 24 V and output voltages as low as 0.7 V. It can deliver a maximum continuous output current of 5 A and a maximum output power of 40 W. It is a member of the TPS546xx family of devices, providing a complete solution for driving power stages up to 24 V.

The device features a proprietary adaptive on-time control architecture to achieve fast transient response and excellent light load efficiency. It operates over a wide input range and maintains a constant frequency of 2.25 MHz. The device also features constant-frequency peak current-mode operation with programmable current limit, over-voltage protection, cycle-by-cycle current limit, and a 1.2 V reference for voltage sensing.

The core of the device is a driver-regulator that selectively drives two external power MOSFETs, which are connected in a step-down circuit to generate the output voltage. The regulator consists of an internal oscillator, driver circuit, current sensing, PWM, and output stage. This combination of components enables the switching of power between the voltage input and the output connector at the desired frequency. The driver-transistor then controls the current flow between the power FETs, thus regulating and controlling the output voltage.

The TPS54627DDAR provides several protections against fault conditions and overvoltage situations. Fault protection includes an integrated thermal shutdown feature and a flexible power-good output. The overvoltage protection (OVP) limits the output voltage to the maximum rating by automatically turning off the driver transistors.

The TPS54627DDAR from Texas Instruments is ideal for a variety of applications including embedded systems, digital signage, power over Ethernet (PoE) networks, LED lighting, and battery-powered devices. It is suitable for DC/DC converter designs which require high efficiency, wide input voltage range, and output current of up to 5 A.

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