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Dual ULDOs tout 'smallest' MLF package

Posted: 11 Aug 2006 ?? ?Print Version ?Bookmark and Share

Keywords:Micrel? ultra-low dropout voltage? ULDO? MIC5320? MIC5321?

Micre's dual ULDO

Micrel Inc. has launched a new family of tiny dual ultra-low dropout voltage (ULDO) linear regulators. The company said its MIC5320 and the MIC5321 are part of a new family of dual LDOs offering ultralow dropout voltages of 35mV at 150mA, more than 70db Power Supply Rejection Ratio (PSRR) and ultralow output noiseall in an extremely compact form factor.

The new devices are offered in one of the industry's smallest packages, a tiny 1.6-by-1.6mm 6-pin MLF package, making them suitable for today's most advanced portable applications including cellular phone RF power, camera modules, imaging sensors for digital still and video cameras, PDAs, portable media players (PMP) and PC cameras.

"Today's portable applications continue to demand increasingly smaller solution sizes without compromising on specifications or performance," noted Ralf Muenster, Micrel's director of marketing for power products. "Micrel's new MIC5320 and MIC5321 allow engineers to reduce the footprint of their solution by an astounding 71 percent when compared to standard 3-by-3mm packaged solutions commonly available in the market."

The MIC5321 is targeted for applications requiring high PSRR because it provides a bypass pin for additional noise filtering. Coupled with the low dropout, this promises significant advantages in applications where maintaining high PSRR under low input voltage-to-output voltage conditions is crucial. The MIC5320 is for general purpose or digital applications requiring over 60db PSRR. This device is said to eliminate the bypass capacitor and provides two enable pins for applications requiring sequenced start-up.

Both devices promise exceptional thermal performance, reduced size and high current capabilities delivering 117mA/mm2, which makes possible very compact form factor designs. The ICs are also said to have the industry's lowest dropout for a 150mA dual LDO, thereby enabling longer battery life when powering portable applications from a Li-ion battery.

The MIC5320 and MIC5321 integrate two, high-performance LDOs that promise exceptional transient performance while requiring only very small and inexpensive 1F ceramic capacitors. Both devices feature low quiescent current, a fast turn-on time of 30a;sec, current limit and thermal shutdown protection, and can operate from -40C to 125C.

The new ULDOs are currently available in volume, with pricing starting at 64 cents for 1,000-unit quantities. Additional ICs are planned for introduction later this year.

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