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NCP140AMXC280TCG application field and working principle

NCP140AMXC280TCG is a voltage regulator of PMIC (Power Management Integrated Circuit) - Voltage Regulators - Linear family.

It has many features: low dropout and low noise, low quiescent current, fast load transient response, over voltage clamp, etc. The device provides adjustable current limit and thermal shutdown protection. With these features NCP140AMXC280TCG can be used in various applications.

Applications:

• Notebooks and desktops with NB and SFF power supply
• Motherboards
• Battery-powered and portable electronic device
• Data storage and networking equipment
• Audio/visual equipment
• PCMCIA, USB, IEEE1394, DSL modems
• PDAs and other sensor networks

Working Principle:

The NCP140AMXC280TCG is a low-dropout linear voltage regulator that uses an internal PNP pass transistor to regulate the output voltage. The device features low noise performance and a low quiescent current (Iqa).

The PNP pass transistor limits the output voltage by drawing a current proportional to the error voltage (Vin - Vout). The error voltage is compared to the reference voltage (Vref) at the internal error-amplifier. The error amplifier outputs a signal that is proportional to the error voltage, and this signal is used to drive the base of the PNP transistor.

The output voltage is set by the external feedback divider network, which is connected to the voltage divider pins (FB and VREF pins). The feedback network determines the output voltage and the output current limit. The resistor between VREF and FB sets the output current limit.

The quiescent current for the NCP140AMXC280TCG is low, due to its low output voltage variation with load current and the low turn-on voltage of the PNP pass transistor. The device also features a fast load transient response and over voltage clamp. This means that the NCP140AMXC280TCG can be used in applications that require fast load transient response and low input-output voltage ripple.

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