NCV51411PWR2G

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The NCV51411PWR2G¹ is a DC/DC switching regulator designed specifically for power management applications. It is a non-isolated, synchronous buck regulator with a 300 kHz fixed frequency and dynamically adjustable duty cycle from 0 to 100%. The device is suited for applications such as the power supply for embedded microprocessors and logic, instrumentation, communication and consumer electronics.

Functionally, the NCV51411PWR2G is an integrated solution combining multiple power stages for a complete system. The power supply circuit is composed of a low-dropout regulator (LDO) for input voltage regulation, a buck switching regulator stage and a voltage feedback loop to provide regulated output voltage. The integration of the LDO and the buck regulator with feedback loop makes the device very efficient in terms of power delivery and regulation accuracy.

The input voltage range is 2.8V to 13.2V and its output is programmed with an external resistor divider setting (ratio – Vout/Vin). Output voltage can range from 0.6V to 6V. The device is capable of delivering up to 2.5A of continuous current, while offering good thermal performance with a maximum power dissipation of 3.2W in a tiny 3-mm × 3-mm QFN package.

A power-save mode is available which reduces the quiescent current to 0.4 μA, which makes the device suitable for battery-based applications. The NCV51411PWR2G features built-in current and thermal protection.

The NCV51411PWR2G is specified over the industrial temperature range from –40°C to +125°C.

The device is a Pulse Width Modulation (PWM) regulator, with the output voltage regulated by pulse width modulation. The regulator takes the input voltage and outputs a square wave signal to drive a power MOSFET, which in turn regulates the output voltage. The frequency of the signal is adjustable and is generally set in the range of 300 kHz to 1MHz. The on-time of the pulse width is proportional to the difference in the input and output voltages, which results in the output voltage being maintained.

The device features protections, including undervoltage lockout, which is used to prevent the regulator from operating at input voltages lower than 4V. It also has overcurrent protection, which protects the regulator from excessive current and thermal shutdown, which protects the device from thermal overload.

The device also incorporates a power-save mode, which reduces the quiescent current down to 0.4μA. This feature makes the device suitable for battery-based applications.

In summary, the NCV51411PWR2G is a DC/DC switching regulator designed specifically for power management applications it is an integrated solution combining multiple power stages for a complete system, offering good thermal performance with a maximum power dissipation of 3.2W in a tiny 3-mm × 3-mm QFN package. With the power-save mode, the quiescent current can be reduced to 0.4 μA, making the device suitable for battery-based applications.

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