The LT3021 is a low dropout linear regulator designed for high performance and flexibility, offering an output current of 500mA. It supports both fixed output voltage options (1.2V, 1.5V, and 1.8V) as well as adjustable configurations. This device is ideal for applications requiring stable and efficient power management in compact designs.
Key features include an input voltage range from 0.9V to 10V, with a typical dropout voltage of just 160mV at 500mA. The output voltage can be set as low as 200mV, making it suitable for low-voltage systems. It also offers excellent load regulation of 0.2% across the full 0–500mA output range, ensuring stable performance under varying loads. The quiescent current is only 130μA, and when in shutdown mode, it drops to an ultra-low 3μA, which is perfect for battery-powered devices.
The LT3021 includes essential protection features such as overcurrent protection, reverse battery protection, and thermal shutdown with hysteresis. It is available in two package options: a 16-pin DFN and an 8-pin SO, providing design flexibility. The operating junction temperature range is from -40°C to 125°C, ensuring reliable performance in a wide range of environments.
Applications include low-current power supplies, portable electronics, mobile phones, wireless modems, and other energy-sensitive systems where efficiency and reliability are critical.
The circuit diagram above shows an adjustable output configuration where the output voltage is calculated as Vout = 0.2V × (1 + R1/R2). The input capacitor is recommended to be 2.2μF, while the output capacitor should be between 3.3μF and 10μF, preferably using a multilayer ceramic capacitor (MLCC) for stability. The SHDN pin is not used here and is connected to the input voltage (Vin) to keep the device active.
Another schematic illustrates a fixed 1.2V output version (LT3021-1.2). In this setup, the SENSE pin is tied to the output voltage, and the SHDN pin is pulled high to enable operation. When SHDN is pulled low, the device turns off, minimizing power consumption. This makes it easy to integrate into systems that require remote control or power-saving modes.
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