NCV5501DT15G

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The NCV5501DT15G is a low dropout linear voltage regulator that provides a current capability of up to 1.5A in an industry standard SOT223-5 package. It is an ideal regulator for medium and high power applications in a wide variety of applications including portable and industrial electronics. The device is well-suited for low noise and high current power supply designs, making it a preferred choice for many applications.

The main application fields for the NCV5501DT15G are various power supply designs for PC motherboards and peripheral equipment, telecom systems, battery chargers, LCD display circuits and various portable devices. The device can also be used for other applications such as high current gate drive and voltage source applications, industrial power supplies and in test and measurement equipment.

Working Principle

The NCV5501DT15G is an adjustable voltage regulator featuring a voltage range of 1.25V to 11V. It is an adjustable low- dropout (LDO) regulator with a maximum output current of 1.5A. The Linear Regulator has an integrated Power MOSFET that provides tight output voltage regulation.

The device has excellent line and load regulation over a wide operating temperature range of -40°C to +125°C and is stable with ceramic output capacitors. The device features a load-dump protection, a power-on reset and a fault-detection circuit to prevent over-voltage, short-circuit and thermal shutdown. It also has a low-noise (50µVrms) operation and an automatic thermal shutdown.

The NCV5501DT15G contains two voltage sensing pins, which are used to set the output voltage. An internal voltage reference provides a voltage reference level, which can be adjusted with an external resistor, and the two pins are used to sense the output voltage. The internal MOSFET switch is controlled by a control circuit, which compares the sensed voltage with the reference voltage to determine the status of the MOSFET switch. The output voltage is then regulated by varying the switch on/off duty cycle.

The NCV5501DT15G also provides a power good signal (PG), which indicates when the output voltage is within a specified range. The PG signal is provided through a dedicated open-drain output pin and is discarded when the output voltage falls below a set level. This benefits an application by immediately signaling a fault condition, which alerts the system and prevents further damage.

Conclusion

The NCV5501DT15G is a low dropout linear voltage regulator suitable for various power supply designs for PC motherboards, telecom systems and various portable devices. With its low-dropout performance, it is an ideal regulator for medium and high power applications. It also provides tight output voltage regulation, low-noise operation and a power good signal, making it a preferred choice for power supply designs.

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