LDO Solution Reduces Footprint By 57%

San Jose, U.S.: Micrel has developed and launched two high-performance, low-dropout (LDO) regulators for portable and space-constrained electronics. The MIC5385 and MIC5387 triple-output LDOs come in a 1.6- by 1.6-mm thin molded lead-frame (MLF) package, which is 57% smaller than the industry-standard 2- by 3-mm MLF package.

These 150-mA triple LDOs suit a range of battery-powered electronic applications including mobile phones, personal navigation devices (PNDs), portable media players (PMP), digital still cameras (DSC), notebook computers, personal digital assistants (PDAs), and handheld instruments.

“When compared to the industry 2- by 3-mm MLF package, the 1.6- by 1.6-mm thin MLF provides portable system designers the smallest footprint,” explained Andy Khayat, director of Micrel’s portable product group. “This new series of high-performance LDOs offers excellent overall performance and value for very high-volume handheld electronics.”

These triple LDOs also feature voltage range options down to 1.0 V. The MIC5385 and MIC5387 provide fast transient response to any load change and up to 70 dB of power-supply rejection ratio (PSRR) for noise-sensitive applications, says Micrel. The devices achieve this in spite of only consuming 32 µA typical per channel while enabled.

With this combination of compact integration, high performance, and low power consumption, the MIC5385 and MIC5385 suit most applications in portable electronics. They use a µCap design operating with very small ceramic output capacitors, which additionally reduces required board space. This series offers full-protection circuitry including current limit and thermal shutdown protection and an operating junction temperature range of –40°C to 125°C as well.

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