NCV551SN15T1G

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Linear voltage regulators are widely used and required in almost all types of applications. The NCV551SN15T1G is a low voltage, low standby current linear voltage regulator which offers a wide range of features.

Characteristics

• Output voltage is adjustable from 0.4V to 8V with a tolerance of ± 5%
• Operating current is up to 100mA
• Operating temperature range is -40°C to+85°C
• Built in thermal shutdown protection
• Low quiescent current of 0.3mA (<20V input)
• Low drop out voltage of 0.2V at 9 mA
• Small package dimensions of 1.6 x 1.6mm

Applications

The NCV551SN15T1G is suitable for a wide range of applications due to its low power consumption, low drop out voltage and high operating temperature range. Some applications include portable electronics, cellular phones, personal digital assistants, PDAs, digital cameras, navigation systems, battery powered hand held equipment, camcorders and laptop computers.

Working Principle

The NCV551SN15T1G is a linear voltage regulator which controls the output voltage by means of an error amplifier. The error amplifier monitors the output voltage and compares it to the reference voltage. If the output voltage is greater than the reference voltage, the error amplifier increases the voltage applied to the base of the regulating transistor, which causes the output voltage to decrease. Similarly, if the output voltage is less than the reference voltage, the error amplifier decreases the voltage applied to the base of the regulating transistor, thus increasing the output voltage. The output voltage is then regulated by controlling the base-emitter voltage of the controlling transistor. This configuration is relatively simple and therefore generates a very low dropout voltage, allowing the regulator to deliver a constant output voltage at a very low power consumption.

Design Considerations

When designing with the NCV551SN15T1G, it is important to keep in mind the maximum input voltage, available output voltage, maximum load current and thermal conditions. Input voltage should not exceed the maximum specified or the device will go into current-limit. Output voltage should be set such that it is below the maximum specified, or else the device will overshoot. The maximum load current should not exceed the specified value, as the device may not be able to withstand a higher load current. Lastly, under certain conditions the device may need additional heat sinking. This is often the case when the maximum load current is exceeded, so it is important to consider thermal effects when designing with this device.

Conclusion

The NCV551SN15T1G provides a versatile and reliable low-voltage, low-power linear voltage regulator suitable for a wide range of applications. With its low quiescent current, low dropout voltage and high operating temperature range, the NCV551SN15T1G is an ideal solution for many battery-powered applications. It is important to account for the maximum input voltage, available output voltage, maximum load current and thermal conditions when designing with this device.

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