Texas Instruments LP38693MP-3.3 3.3V / 500mA LDO Voltage Regulator, SOT-223-5

The Texas Instruments LP38693MP-3.3/NOPB is a precision, low-dropout (LDO) CMOS linear voltage regulator delivering a fixed 3.3V output with a maximum current of 500mA. Engineered for efficiency, it boasts an extremely low dropout voltage of just 250mV, enabling stable operation even when the input voltage is very close to the output level, which is ideal for maximising battery life in portable applications.

A key advantage of this regulator is its tight output voltage tolerance, typically within 2%, ensuring reliable and consistent power delivery to sensitive components. This precision is achieved through a trimmed band-gap reference. The use of a PMOS power transistor architecture eliminates the need for DC base-drive current, resulting in a remarkably low ground pin current that remains under 100µA across all load currents, input voltages, and operating temperatures.

Key Features & Protection

The device incorporates robust protection mechanisms for system safety and longevity. Thermal overload protection shuts down the regulator if excessive junction temperature is detected, preventing damage. Fold-back current limiting provides short-circuit and overload protection by reducing the output current under fault conditions. An enable pin allows for external control of the regulator, facilitating power sequencing and helping to minimise overall system power consumption, with an off-state quiescent current of just 1µA.

Designed for stability, it performs excellently with ultralow equivalent series resistance (ESR) ceramic output capacitors, simplifying the bill of materials. As a green product, it is manufactured with no antimony or bromine (no Sb/Br), complying with environmental directives.

Typical Applications

This versatile LDO regulator is perfectly suited for a wide range of electronic systems requiring clean, stable, and efficient power regulation. Its combination of low noise, high PŠ