LD3985M47R

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LD3985M47R is a low-dropout (LDO) linear voltage regulator

The device is optimized specifically for applications where low quiescent current and wide output voltage range are needed. It can deliver up to 1A output current and offer adjustable output voltage range of 1.2V to 6V. It features an input voltage range from 2V up to 16V. The device uses precision 2.5% series reference, providing accuracy line and load regulation.

LD3985M47R is a high-performance regulator. It has an ultra-low quiescent current of typically 8µA, and also consume only 150µA of shutdown current. Its wide input voltage range makes it ideal for devices in need of low-loss regulation and wide system operating voltages range.

The LD3985M47R offers a variety of protection features, including short-circuit protection, current-limit protection and thermal protection. It also has capacitor-less design, and it finally provide users with a simple, cost-efficient solution.

Application field and Working Principle

The LD3985M47R low-dropout linear voltage regulator can be mainly used for portable applications, such as notebook computers, PDAs, portable media players, digital cameras and cell phones. Its wide input voltage range makes it suitable for applications where common DC input source is available including batteries, USB power, and AC adapters.

The working principle of the device is simple. Through a combination of a power transistor and precision reference, LD3985M47R voltage regulator provides an accurate output voltage. The feedback voltage from the output controls the voltage by adjusting the current through the Base-Emitter junction. When the output voltage is lower than the reference, the transistor will turn on to provide more current to raise the output voltage. On the other hand, when the output voltage is higher than the reference, the current flow is reduced, thus lowering the output voltage. This process, called regulation, will be repeated all the time as the output voltage variation, so as to keep a constant output voltage all the time.

The device supplies the internal power transistor with a constant current source. This constant current source provides a temperature-insensitive loop control, ensuring that the voltage regulation point will remain constant over temperature. This results in a very stable output.

LD3985M47R also provides an enable feature that allows the user to shut down the output by activating an external logic. Low power dissipation in shutdown mode also reduce the device’s total energy expense.

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