TPS61054DRCR

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TPS61054DRCR is a high-efficiency, space-saving, step-up converter for a broad range of portable applications. It is a very common PMIC-LED Driver that used in different kind of application such as air quality sensors, area illumination, keyboard/switch illumination, Led flash and torch, night alarm, and power level indication.

The TPS61054DRCR takes an input voltage range of 2.7V – 5.5V and boosts it to a maximum of 21V giving you 6-20mA continuous output current with up to 95% efficiency. The TPS61054DRCR converter is internally compensated and features pulse-by-pulse current limiting with a 0.8µs fault protection enabling higher efficiency over a wide range of output load current. It is offered in a 3x3x0.8mm, 5-pin VDFN package allowing for greater output power density. It is available with a maximum switching frequency of 1MHz.

The circuit of TPS61054DRCR involves two blocks – the power switch, which can be an N-channel MOSFET, and control circuitry. The power switch provides an idealized ON/OFF switch which controls the power delivered to the output voltage. In ON state full power is delivered, while in OFF state no power is delivered. The control circuitry provides the switching timing, the regulation of output voltage and other protection circuits. An N-channel transistor is used for the power switch due to its low ON resistance and its better high frequency switching performance.

The control circuitry of the TPS61054DRCR consists of a synchronous rectifier control circuit, a pulse width modulation (PWM) converter, a feedback loop and a constant frequency oscillator. The synchronous rectifier control circuit senses the output voltage and regulatesthe power switch to maintain a constant output voltage. The PWM converter receives a voltage input and produces an output whose pulse width is proportional to the measured voltage. The feedback loop monitors the output voltage and adjusts its pulse width accordingly. The constant frequency oscillator sets the operating speed of the TPS61054DRCR and is used to generate the synchronous recitification control signal.

The TPS61054DRCR also provides protection features that prevent excessive input voltage or output current. It has an under-voltage lockout (UVLO) and thermal shutdown that prevents current from exceeding its guaranteed safe limit. It also has a low-side MOSFET protection circuit which ensures that the load current is limited in case of short-circuit. Additionally, it has a short-to-ground protection to prevent it from overheating.

In summary, TPS61054DRCR is a great choice for applications requiring efficient, low-cost LED drivers due to its small size, high efficiency, and protection features. Its wide input voltage range, wide output current range and constant frequency oscillator make it suitable for various applications. Moreover, its silver-pad and VDFN package place it as an integrated solution, reducing the total system cost.

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