LP5912Q3.0DRVRQ1 Application Field and Working Principle

LP5912Q3.0DRVRQ1 is a high-performance linear voltage regulator from National Semiconductor. It is a 3.0V low-dropout fixed output-voltage current regulator available in both 5-pin SOT23 and 10-pin QSOP packages. Its wide input voltage range of 1.71V to 7.0V and very low dropout voltage make it an ideal choice for power-sensitive applications.

The LP5912Q3.0DRVRQ1 belongs to PMIC (Power Management IC) category, specifically the Voltage Regulators - Linear subcategory. It provides a constant 3.0V output voltage over a wide input voltage range of 1.71V to 7.0V. It utilizes a dropout voltage of typically 180 mV, and can deliver up to 250mA of output current. It has an ultra-low quiescent current of 7μA in light load operation, making it ideal for power-sensitive applications.

The LP5912Q3.0DRVRQ1 provides a unique feature of thermal shutdown protection. This feature helps to prevent the device from extreme temperatures and allows the regulator to function within its rated temperature range of -40°C to +125°C. The device also features over-voltage protection, which limits the output current during output overshoots, further protecting the device.

The LP5912Q3.0DRVRQ1 works on a feedback loop principle. The device contains an error amplifier, an internal voltage reference, a current limit circuit, a thermal shutdown circuit and a power MOSFET to regulate the output voltage. When an input voltage is applied, an error amplifier compares the regulator output voltage to the internal voltage reference of 2.6V, and provides a control voltage to the gate of the power MOSFET. If the output voltage of the regulator starts to vary from the required voltage level, the error amplifier adjusts the control voltage to the power MOSFET, maintaining thereby the output voltage constant

The LP5912Q3.0DRVRQ1 is widely used in power-sensitive electronic systems such as portable electronic devices and instrumentation equipment. The device is available in 5-pin SOT23 and 10-pin QSOP packages.