STMicroelectronics’ 40V industrial and automotive linear regulators combine efficiency with flexibility

STMicroelectronics’ LDH40 and LDQ40 voltage regulators for automotive and industrial applications start-up from an input as low as 3.3V, operate with up to 40V applied, and have low quiescent current. The LDH40 delivers up to 200mA and is available in one version only, having adjustable output voltage from 1.2V to 22V. The 250mA LDQ40 is available with a 1.2V-12V adjustable output and a choice of 1.8V, 2.5V, 3.3V, and 5.0V fixed output voltages.

These low-dropout (LDO) regulators ensure efficient power conversion for energy-conscious applications. The quiescent current of 2µA at zero load and 300nA logic-controlled shutdown mode help preserve battery energy in always-on standby systems. The devices are stabilized with a small ceramic capacitor on the output.

The automotive devices are AEC-Q100 qualified and packaged as 2mm x 2mm DFN6L devices with wettable flanks that ease PCB design and facilitate automated optical inspection. Their wide input-voltage range allows connection to a vehicle 12V bus, that can reach up to 40V transient, to power infotainment systems, instrument clusters, and advanced driver-assistance systems (ADAS). With their low quiescent and standby current, they are especially suited to use in electric vehicles (more info).