The LT3021 is a high-performance, low-dropout linear regulator capable of delivering up to 500mA of output current. It offers both fixed and adjustable output voltage options, making it highly versatile for a wide range of applications. The device operates within an input voltage range of 0.9V to 10V, with a typical dropout voltage of just 160mV at 500mA, ensuring efficient power delivery even in low-voltage environments.
Key features include a configurable output voltage that can be set as low as 200mV, a 3.3μF output capacitor requirement, and excellent load regulation of 0.2% across the full 0–500mA current range. The quiescent current is only 130μA, and when in shutdown mode, the power consumption drops to a mere 3μA. Additional protection features such as current limit, reverse battery protection, and overtemperature protection with hysteresis ensure reliable operation under various conditions.
Available in two package options—16-pin DFN and 8-pin SO—the LT3021 is suitable for use in compact designs. It operates reliably over a wide junction temperature range of -40°C to +125°C, making it ideal for industrial and consumer electronics alike.
Applications include low-power systems, battery-powered devices, mobile phones, wireless modems, and more. The device supports flexible configuration through external resistors, allowing users to customize the output voltage according to their specific needs.
The following application circuit illustrates how to configure the LT3021 for an adjustable output voltage. The output voltage is calculated using the formula: Vout = 0.2V × (1 + R1/R2). A 2.2μF input capacitor and a 3.3μF ceramic output capacitor are recommended for stable performance.
Another example shows a fixed 1.2V output configuration (model LT3021-1.2). In this setup, the SENSE pin is connected to the output voltage, and the SHDN pin must be held high to enable operation. When SHDN is pulled low, the device enters shutdown mode, significantly reducing power consumption.
Whether you're designing a power supply for a portable device or a low-noise system, the LT3021 provides a robust and efficient solution. Its combination of low dropout, high accuracy, and advanced protection features makes it a top choice for engineers looking for reliability and flexibility in their designs.
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