LP87743-Q1

The LP87743-Q1 is a high-efficiency, low-dropout (LDO) linear regulator designed for automotive applications, manufactured by Texas Instruments. It delivers up to 3 A of continuous output current with excellent line and load regulation, ensuring stable voltage delivery under varying conditions. The device features an ultra-low quiescent current of just 50 µA, making it ideal for power-sensitive systems where efficiency and long battery life are critical. This regulator operates from an input voltage range of 2.5 V to 5.5 V, supporting a wide variety of supply configurations commonly found in automotive electronics. Its integrated thermal shutdown and over-current protection enhance system reliability by preventing damage due to excessive heat or abnormal current draw. Additionally, the LP87743-Q1 includes a fast transient response, minimizing voltage deviations during sudden load changes—a key requirement in modern vehicle environments with dynamic electronic loads. Designed for compliance with AEC-Q100 Grade 1 qualification, the LP87743-Q1 meets stringent automotive standards for reliability, temperature performance, and durability across harsh operating conditions—from -40°C to +125°C. This makes it suitable for use in engine control units (ECUs), infotainment systems, advanced driver-assistance systems (ADAS), and other safety-critical automotive domains. The device supports multiple output voltages via external resistor dividers, offering flexibility in system design. It also features an enable pin for remote control of power states, enabling power sequencing and sleep-mode operation to reduce overall system power consumption. With its compact 3 mm × 3 mm WQFN package, the LP87743-Q1 provides a space-efficient solution for densely populated PCBs in automotive and industrial applications. In summary, the LP87743-Q1 combines high performance, robust protection mechanisms, and automotive-grade reliability, making it a preferred choice for powering sensitive circuits in vehicles where stability, efficiency, and long-term durability are paramount.