CMOS LDO Regulators Automatically Save Power

A series of CMOS low-dropout (LDO) regulators features the company’s automatic power-saving (APS) function that dynamically switches performance characteristics based on operating conditions. The BHxxPB1 Series combines small packaging, minimal external components and simple design-in with very low average power consumption. During high-speed operation, with operating current of 20 µA, the output voltage is regulated to ±1% over step-load changes. In the power-save mode, the operating current is reduced to 2 µA. These devices are particularly useful in portable applications such as cell phones, where lower average current consumption can aid in extending battery life. The PB1 series is offered in nine models with fixed output voltages ranging from 1.2 V to 3.3 V. Models in the series feature a built-in shutdown function, 8-kV ESD protection, and foldback over-current and thermal protection. They feature a low-voltage reference source to enable stable operation from 1.7-V inputs and an integrated output discharge function that eliminates external blocking diodes required to prevent reverse-voltage damage. Pricing is $0.23 each in small quantities; samples are available now with production quantities available in 12 weeks from receipt of order. ROHM SEMICONDUCTOR USA, San Diego, CA. (858) 625-3600.