LP38691SD-5.0

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The LP38691SD-5.0 is a three-terminal ultra-low-noise linear regulator capable of delivering 250mA of continuous load current in a SOT-23-5 package. It provides high-performance operation, low noise, and low minimum dropout voltage. This linear regulator integrated circuit (IC) is designed to provide a regulated output voltage from an input voltage that is above the regulated output voltage.

Applications

The LP38691SD-5.0 is designed for battery-powered and supply voltage-sensitive applications such as digital cameras, CMOS and CCD image sensors, portable radios, and cellular phones. It is also suitable for tabletop electronic product applications such as CD/DVD players, satellite receivers, and disk drives. Other possible applications include medical devices, metering, and system monitoring.

Working Principle

The LP38691SD-5.0 uses a linear regulator circuit operating with a low quiescent current. It features an advanced BiCMOS design and integrated-circuit process to provide low dropout performance and low noise. The output voltage is determined by an external resistor divider. An internal pass transistor is operated in an unregulated current mirror structure. The output current is defined by a single feedback input, which is used to compensate for both load current and thermal conditions. This results in a voltage accuracy of ±0.5% over the entire range of operating power consumptions. The LP38691SD-5.0 is capable of delivering up to 250mA of output current, and has a wide operating temperature range of –40°C to 85°C.

The LP38691SD-5.0 features internal current limiting and thermal shutdown circuitry to protect the device from overload and other damage. The device can be shut down through an open-drain logic input pin. The shutdown current is typically less than 0.1uA. The device also incorporates an internal compensation circuit that reduces the device’s power supply rejection ratio (PSRR), and enhances line transient response.

Benefits

The LP38691SD-5.0 linear regulator offers several benefits, including a wide operating temperature range and low noise operation. The device is designed for ultra-low-noise operation, and provides flexibility in its output voltage accuracy. The device has a wide operating range of -40°C to 85°C, which makes it ideal for applications where the ambient temperature may range from cold to hot temperatures.

Conclusion

The LP38691SD-5.0 linear regulator is an ideal choice for low noise portable and system monitoring applications. The device offers a wide operating temperature range of -40°C to 85°C, low dropout performance, and low noise operation. The device is capable of delivering up to 250mA of continuous load current in a SOT-23-5 package. Additionally, it features internal current limiting, shutdown, and thermal protection.

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