Low dropout regulators

8 February 2012 Power Electronics / Power Management

Recently introduced by Analog Devices is a pair of LDOs (low dropout regulators) with low noise, high power supply rejection, and excellent line and load transient response. The ADP7102 and ADP7104 LDOs achieve a 15 μVrms fixed-voltage noise figure, power supply rejection ratio (PSRR) of 60 dB at 10 kHz in 3 V operation, and feature reverse current protection to guard against shorts and sudden load discharges. They are designed to maximise the load performance and yield higher data conversion accuracy and resolution in high-frequency communications infrastructure, medical imaging, and industrial and instrumentation applications.

The new LDOs operate from 3,3 V to 20 V and are designed to regulate high-performance analog and mixed-signal circuits operating from 19 V to 1,22 V rails while achieving excellent line and load transient response with just a small 1 μF ceramic output. The ADP7102 has a maximum output current of 500 mA, while the maximum output current of the ADP7104 is 300 mA. Both are available in an 8-lead SOIC-EP and a space saving 3 x 3 mm LFCSP package.

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