The MCP1755 and MCP1755S are high-performance, high-input-voltage and high-output-current family of CMOS Low-Dropout (LDO) voltage regulators from Microchip Technology. These LDOs can accept a wide input voltage range of 3.6-16V and deliver an output current of 300 mA at output voltages of 1.8-5.5V, while consuming only 68 µA of quiescent current (typical). Additionally, the MCP1755/1755S LDOs have a shutdown pin, enabling them to consume less than 0.1 µA (typical) during shutdown mode, which extends battery lifetimes. To conserve space, the LDOs are offered in SOT and 2x3 mm DFN packages. These features provide designers with a high degree of flexibility for an extremely broad range of applications, such as medical, mobile devices and LED lighting controllers.
Many of today's electronic designs need to operate in environments that contain high levels of electrical and magnetic noise. Noise is generated when switching transients and RF signals get coupled onto power-supply lines. Applications such as GFCI and AFCI circuit breakers, wireless devices, automotive-aftermarket electronics, and medical devices are sensitive to this power-supply noise. The MCP1755 and MCP1755S LDOs have a high Power Supply Rejection Ratio (PSRR) of 70 dB @ 1 kHz, which filters input noise and provides significantly cleaner output voltages, making them well suited for noise-sensitive applications.
Both of the new LDOs are available today for sampling and volume production, starting at $0.45 each in 5,000-unit quantities. The MCP1755S is offered in 3-pin SOT223 and 8-pin, 2x3 mm DFN packages. The MCP1755 is available in 5-pin SOT223 and SOT23 packages, as well as the 8-pin, 2x3 mm DFN.
