ADI LT1763 Low Noise Micropower Regulators

LT1763 Low Noise Micropower Regulators General Description

The LT1763 series of regulators are designed for low-power, low-noise, and low dropout voltage applications. The LT1763 series is capable of supplying up to 500mA of output current. These regulators have a low dropout voltage of only 300mV. This means they can regulate the output voltage even when the input voltage is very close to the desired output voltage. The regulators have a low quiescent current of 30µA, making them suitable for battery-powered systems where power efficiency is crucial. Importantly, the quiescent current remains well controlled and does not increase as the input voltage approaches the output voltage (dropout). The LT1763 regulators are known for their low output noise. When an external 0.01µF bypass capacitor is added, the output noise is as low as 20µVRMS over a bandwidth of 10Hz to 100kHz. This is advantageous for noise-sensitive applications. These regulators remain stable with output capacitors as low as 3.3µF. Unlike some other regulators, you can use small ceramic capacitors without needing additional series resistance for stability. The regulators include internal protection features such as reverse battery protection, current limiting, thermal limiting, and reverse current protection. These protections help ensure the safety and reliability of the device and the connected circuitry. The LT1763 regulators are available in fixed output voltages of 1.5V, 1.8V, 2.5V, 3V, 3.3V, and 5V. They are also available as an adjustable device with a 1.22V reference voltage. The LT1763 regulators come in 8-lead SO (Small Outline) and 12-lead DFN (Dual Flat No-Lead) packages, including low-profile DFN packages that are compact and space-efficient.

Pin configuration

Features

Low Noise: The regulators offer low output noise of 20µVRMS over a wide bandwidth of 10Hz to 100kHz, making them ideal for noise-sensitive applications.

Output Current: Capable of providing an output current of up to 500mA, which is useful for powering a range of electronic components and systems.

Low Quiescent Current: The quiescent current is as low as 30µA, making these regulators energy-efficient, especially in battery-powered applications.

Wide Input Voltage Range: The regulators can accept a broad input voltage range from 1.8V to 20V, providing flexibility in power supply design.

Low Dropout Voltage: With a dropout voltage of only 300mV, the regulators can maintain stable output voltage even when the input voltage is very close to the desired output voltage.

Very Low Shutdown Current: In shutdown mode, the current consumption is less than 1µA, helping conserve power when the regulator is not in use.

No Protection Diodes Needed: These regulators do not require additional protection diodes, simplifying circuit design.

Fixed and Adjustable Output Voltages: Available in fixed output voltages of 1.5V, 1.8V, 2.5V, 3V, 3.3V, and 5V, and as an adjustable device with an output voltage ranging from 1.22V to 20V.

Stable with Low-Value Output Capacitors: The regulators remain stable with output capacitors as low as 3.3µF, and they can work with various types of capacitors, including aluminum, tantalum, and ceramic.

Protection Features: Internal protection features include reverse battery protection, overcurrent protection, overtemperature protection, and the prevention of reverse current.

Package Options: The regulators are available in 8-lead SO (Small Outline) and 12-lead DFN (Dual Flat No-Lead) packages, including low-profile DFN packages for space-efficient designs.

Related Parts

Application

The LT1763 series of regulators is well-suited for various applications due to its low noise, low dropout voltage, and other features. Here are some specific applications where the LT1763 regulators can be employed:

Cellular Phones: The low dropout voltage and low noise characteristics make the LT1763 series ideal for regulating power in cellular phones and other mobile devices. These regulators can help maintain stable and clean power supplies for critical components in these devices.

Battery-Powered Systems: The low quiescent current of 30µA and the ability to operate with a wide input voltage range from 1.8V to 20V make the LT1763 regulators suitable for various battery-powered systems. This includes portable electronics, IoT devices, and other battery-operated equipment where power efficiency is essential.

Noise-Sensitive Instrumentation Systems: Noise-sensitive instrumentation systems, such as precision measurement equipment, audio devices, and sensors, can benefit from the low output noise (20µVRMS) offered by the LT1763 regulators. These regulators can help maintain a clean and stable power supply to ensure accurate and reliable measurements and signal processing.

Typical Application

Absolute Maxium Rating

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