LDOs Feature Low-Voltage Inputs

The ADP174x and ADP175x low drop-out (LDO) regulators are optimized for low input and output voltage operation in applications that require low-noise power. While many traditional LDOs can only operate down to inputs of 2.5 V, or require a second power input to convert from less than 2.5 V, the ADP174x and ADP175x families operate on voltages as low as 1.6 V. This reduces the power wasted when converting from higher inputs, and makes PCB layout much easier. The devices also incorporate “enable” and “power good” pins that simplify system health monitoring in mission-critical applications. The devices are available with 800-mA, 1.2-A, or 2-A load-current ranges. Power-supply rejection ratio at 100 kHz is ?60 dB and drop-out performance is 160 mV at 2 A. The regulators are available now in 4- by 4-mm 16-lead leadless frame chip-set packages with an exposed pad that conducts heat away from the device to improve thermal conduction. Prices range from $0.90 to $1.20 in quantities of 1000. ANALOG DEVICES INC., Norwood, MA. (781) 329-4700.