LDO voltage-regulator family targets demanding applications



Microchip Technology, a leading provider of microcontroller, mixed-signal, analog and Flash-IP solutions, announced the MCP1755 and MCP1755S high-performance, high-input-voltage and high-output-current family of CMOS Low-Dropout (LDO) voltage regulators 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. "The MCP1755/S LDOs are ideal for designs with 9V and 12V power-supply rails, and their higher output current expands our high-performance LDO portfolio into a broader range of applications," said Bryan J. Liddiard, marketing vice president of Microchip's Analog & Interface Products Division. "Additionally, the high PSRR of these voltage regulators is great for applications that require very clean supply voltages." Microchip