PHILIPS has introduced the SA8877-XX family of very low noise, low dropout, low quiescent current linear regulators designed for battery-powered applications, although they can also be used for devices powered by ac-dc converters.
Available from Adilam Electronics , the parts are available in a range of preset output voltages from 2.5V to 4.5V. Typical dropout voltages are only 165mV at 150mA, and 55mV at 50mA. Reverse battery current is extremely low, 0.5μA typ.
For demanding applications, output noise voltage of typically 20μV rms is achieved with a 0.01μF capacitor on the noise bypass pin. The input voltage can vary from 2.5V dc to 5.5V dc, providing up to 150mA output current.
An internal P-channel FET pass transistor maintains an 85μA typical supply current, independent of the load current and dropout voltage.
Other features include a 0.01μA logic-controlled shutdown, short circuit and thermal shutdown protection, and reverse battery protection.
To accommodate high density layouts, it is packaged in the small footprint 5-pin SO5 (SOT23-5). The SA8877 is pin compatible with the industry standard ¹2982 and a direct replacement for the MAX8877.