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LDO touts 60 percent lower quiescent current

Posted: 15 Dec 2006 ?? ?Print Version ?Bookmark and Share

Keywords:LDO? regulator? linear regulators? power management? Maxim?

Maxim Integrated Products has announced the MAX5091, a low-quiescent-current LDO with a wide operating input-voltage range of 5-40V and the capability to withstand up to 40V transients. Its maximum light-load quiescent current is 100mA, which is approximately 60 percent lower than the nearest competitor, the company said. This device delivers up to 100mA of output current with low 50mV (max) dropout voltage.

The MAX5091 has stable operation with a small, 10mF ceramic cap. A user-adjustable reset timeout can be programmed with an external capacitor. The integrated active-low microprocessor reset circuit is triggered when the regulator output drops 10 percent below the nominal voltage, thus providing an early system warning of an impending power failure. An Enable input then turns the regulator off. The uncommitted comparator can monitor the input voltage or detect power-fail conditions.

The device is available in thermally enhanced, surface-mount, 8-pin TDFN and SO-EP packages. When operating in the JEDEC 51 standard environment, the TDFN package has a thermal junction-to-case resistance of 6C/W. The 8-pin SO has a thermal junction-to-case resistance of 8C/W. The exposed-paddle packages are very effective thermal conductors that simplify thermal design.

The MAX5091 is rated for operation through the automotive temperature range (-40C to 125C). It is available with fixed 3.3V or 5V outputs, and includes short-circuit protection and thermal shutdown. Pricing starts at $1.25 (1,000-up, FOB USA).

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