LDO voltage-regulators offer best performance, size, price

Ideal for designs with 9- and 12-V power-supply rails, the MCP1755 CMOS and MCP1755S low-dropout (LDO) voltage regulators can accept a wide input voltage range of 3.6 to 16 V and deliver an output current of 300 mA at output voltages of 1.8 to 5.5V, while consuming only 68 µA of quiescent current typical. These parts have a shutdown pin, enabling them to consume less than 0.1 µA typical during shutdown mode, which extends battery lifetimes.  They target a broad range of applications, such as medical, mobile devices and LED lighting controllers.

In addition, the LDOs have a PSRR of 70 dB at 1 kHz, which filters input noise and provides significantly cleaner output voltages, making them well suited for noise-sensitive applications. The MCP1755S is offered in 3-pin SOT223 and 8-pin, 2×3 mm DFN packages.  The MCP1755 is available in 5-pin SOT223 and SOT23 packages, as well as the 8-pin, 2×3 mm DFN. (From $0.45 ea/5,000 — available now)