TPS54140DGQ

The TPS54140DGQ is a non-synchronous buck DC-DC converter with advanced features. This device is designed to provide high efficiency, low noise, and high performance linear current mode regulation. It also features an integrated power MOSFET, low input UVLO, and current-limited protection. The output voltage range of TPS54140DGQ is from 0.6V to 5.5V. It supports high input voltage (up to 42V) with low quiescent current (IQ) and high efficiency. The device can operate in both Continuous Conduction Mode (CCM) and Discontinuous Conduction Mode (DCM) for efficiency.

The application field of TPS54140DGQ includes mobile phones, battery powered equipment, digital cameras, notebooks, LCD TVs, and other general purpose applications. It is used in computer-based systems, power coming from a standard battery charger, or straight from a single power line with the need of low voltage regulators.

The working principle of the TPS54140DGQ is based on a Pulse Width Modulation (PWM) regulation, which is generated by a high-side N-MOSFET acting in a Square wave format at a frequency of 1.2 MHz. A low-side NFET is utilized for a synchronous rectification. The IC contains two differential inputs and two operators, to provide good output voltage accuracy and wide line and load compensation range.

As a non-synchronous buck regulator, TPS54140DGQ performs two steps: step-downing from the input voltage (VIN) to a middle voltage (Vmid) and step-downing from Vmid to the output voltage (Vout). Both steps are regulated by the error amplifier (EA) and the current sense comparator (CSC) of the IC. The EA sets the duty cycle of the high-side N-MOSFET while the CSC sets the pulse-by-pulse limitation of the switch current.

In conclusion, the TPS54140DGQ is a high-efficiency, low-noise, and high-performance linear current mode buck DC-DC converter. It has been designed to be used in a wide range of applications and can be used to reliably provide the desired output voltage with high accuracy.