LDL212DR

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The LDL212DR is a linear voltage regulator designed to provide a stable output voltage even when faced with large input voltage fluctuations. It is part of a family of voltage regulators manufactured by Linear Technology, offering features such as fast transient response, internal current limiting, thermal shutdown protection and low dropout voltage.

The LDL212DR works by accurately regulating the output voltage under a wide range of input voltages and suppliers. The device uses a bandgap reference circuit, a p-channel MOSFET, and an error amplifier to regulate the output voltage. The bandgap reference circuit provides an accurate and stable reference voltage which is compared to the input voltage. The error amplifier essentially amplifies any difference between the reference voltage and the input voltage and drives the gate of the MOSFET, which in turn provides the regulation of the output voltage. The current limit circuitry prevents the device from overloading and the thermal shutdown circuit helps protect against overheating.

The LDL212DR is typically used for applications that require an accurately regulated output voltage even in the face of large input voltage fluctuations. Such systems require smooth dynamic loading, typically in battery powered applications. Examples of systems where it could be used include portable medical equipment, Li-ion/Li-Po battery-powered consumer electronic equipment, automotive audio systems, computer peripherals, and communications systems.

The LDL212DR has several performance features that make it well suited for the task, including a dropout voltage of 160mV (at 5mA) and a minimum input voltage of 2.5V. The device also has a 1.2µA (typical) quiescent current, low noise level and a fast transient response of 15µs. The device is available in a variety of fixed output voltage options from 1.2V to 5V, and is available in the popular SOT-23-5 package.

The Linear Technology LDL212DR is a cost-effective and highly reliable linear voltage regulator especially suited for applications where accurate and reliable output voltage is required even when faced with large input voltage fluctuations. It offers a wide input voltage and fast transient performance, along with protection circuitry to help ensure the device’s long term reliability.

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