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10mA LDO offers power saving features

Posted: 23 Nov 2006 ?? ?Print Version ?Bookmark and Share

Keywords:Micrel? MIC5232? LDO? low-dropout? regulator?

Micrel Inc. has launched a 10mA low dropout (LDO) that offers power saving features for extending battery life. The MIC5232 is suitable to provide stand-by power to memory and real-time clocks used in high-end mobile phones, PDAs, GPS, handheld instrumentation/metering and medical instrumentation.

"Ultralow quiescent current LDOs (1?A-type) have been around for some time," noted Ralf Muenster, Micrel's director of marketing for power products. "However, most offer poor regulation, no protection circuitry and cannot be back driven, making them ill-suited to today's consumer products. The MIC5232 offers a lower input voltage and lower output voltage capability, making it an ideal solution for a wide variety of portable applications where saving battery power is crucial."

The MIC5232 LDO features ultralow ground current of 1.2?A, typical. A back-bias protection feature allows for external voltage that can be supplied to the output of the MIC5232 without harm or excessive current flow. This feature allows this LDO to be used in a battery back-up system where it regulates a coin cell while preventing reverse current to the coin cell when a higher supply voltage is applied to the output of the LDO. Additional protection features include thermal shutdown and current limit. The input voltage range of the device is 2.7-7V, which covers 3.3V and 5V bus and Li-ion battery input voltage ranges. The MIC5232 is available in fixed output voltages in a 2-by-2mm MLF6-L and TSOT-23-5 packages. The parts are qualified to the full industrial temperature range of 40C to 125C.

The MIC5232 is currently available in volume and pricing starts at 45 cents for 1,000 units.

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