STMicroelectronics Fixed LDO Voltage Regulator 3.3V 0.5A TO-252-3

The STMicroelectronics Fixed LDO Voltage Regulator is a highly efficient low-dropout regulator featuring an inhibit function and a fixed 3.3V output. Designed with low quiescent current, it is particularly suited for low-noise, low-power applications, especially in battery-powered systems.

When utilised in a 5-pin configuration (PPAK), a shutdown logic control function is available (pin 2, TTL compatible). This allows a part of the board to be put into standby mode when used as a local regulator, significantly decreasing total power consumption. In the 3-terminal configuration, the device delivers the same electrical performance but remains fixed in the ON state.

Key Features

• Very low drop-out voltage (0.45V)
• Very low quiescent current (typical 50µA in OFF mode, 500µA in ON mode)
• 500mA output current
• Logic-controlled electronic shutdown
• Internal current and thermal limit
• Available in ±1% (AB) or ±2% (C) selection at 25°C
• 80dB (typical) supply voltage rejection
• Requires a capacitor of only 2.2µF for stability, saving board space and costs

This surface-mount device offers reliable performance across an operating temperature range of -40°C to 125°C, making it a robust choice for demanding environments.