STMicroelectronics Voltage Regulators - Linear LD3985J18R

The LD3985J18R is a linear voltage regulator from Quarktwin Technology Ltd. designed to provide a stable output current of up to 150 mA. It operates with an input voltage range of 2.5 V to 6 V and features an ultra low dropout voltage of 60 mV at a 150 mA load, making it suitable for low power applications, particularly in battery-powered systems. The device has a very low quiescent current of 85 ¬µA at no load and 170 ¬µA at full load, with a maximum of 1.5 ¬µA in OFF mode, which helps prolong battery life. This regulator is stable with low ESR ceramic capacitors and offers a wide range of output voltages including 1.22 V, 1.8 V, 2.5 V, 2.7 V, 2.8 V, 2.9 V, 3 V, 3.3 V, and 4.7 V. It also features a fast turn-on time of approximately 200 ¬µs and includes logic-controlled electronic shutdown for reduced power consumption. The output noise voltage is low at 30 ¬µV RMS over a frequency range of 10 Hz to 100 kHz, and it maintains a power supply rejection ratio of 60 dB at 1 kHz. The operating temperature range is from -40 ¬8C to 125 ¬8C, making it suitable for various environmental conditions.