One-Amp Voltage Regulators Support Sub-1 V Rails
Thu, 04/01/2010 - 8:20am
ON Semiconductor introduced five CMOS linear voltage regulator families. The NCP69x families are optimized for use in low current consumption portable battery-powered and ‘always on’ applications such as cable modems, satellite receivers, digital-set-top boxes and electricity meters. The NCP690, NCP691, and NCP692 are very low dDropout (VLDO) 1 A regulator devices available with an adjustable output voltage from 5.0 V down to 1.25 V or in fixed voltage versions. The devices offer a power supply rejection ratio (PSRR) of 62 dB, low quiescent current (145 uA typical) and low noise (50 µVrms) operation, as well as short circuit and thermal protection. They have electro-static discharge (ESD) protection of 4 kV and are designed to be used with low cost ceramic capacitors. The NCP691 includes an enable-low function, while the NCP692 has an enable-high function. The NCP693 1 A regulator operates with a supply current of 65 µA at no load, and a standby mode with a supply current less than 0.15 µA, selected by a chip enable pin. Standard voltage versions are 0.8 V, 1.0 V, 1.2 V, 2.5 V and 3.3 V. This series is complemented by the NCP694, which is an Ultra Low Dropout (ULDO) 1 A regulator for applications where there is a small differential between the input and output voltage.