TITLE

Power regulators and LDOs

PUB. DATE
January 2005
SOURCE
Portable Design;Jan2005, Vol. 11 Issue 1, p45
SOURCE TYPE
Periodical
DOC. TYPE
Article
ABSTRACT
The article reports that combining a 300-mA LDO linear regulator with a low-current ;uP reset in half the space of two discrete devices, the 3- by 2.85-mm AAT3258 minimizes board size for portable products like cell phones, PDAs, digital cameras, and notebook computers. With separate input pins, the regulator also allows designers to operate each function from independent sources and more easily and efficiently configure their design. It features very fast startup and shutdown timing to regulate power for microprocessor blocks that quickly turn to full power from sleep mode and delivers very fast transient response time to react quickly to load current changes--important for such applications as GSM phones, which turn on and off quickly to transmit and receive data. The LDO comes in either 12-pin QFN 4- by 4-mm or wafer bumping packaging. he user has three choices of termination: Program the timer, program the current, or rely on an external means such as a DSP or microcontroller. The one-time programmable function allows engineers to program the output voltage for each regulator onsite in the range from 1.8 to 3.3 V in steps of 100 mV, allowing for fast prototyping as well as full-production ramp-up.
ACCESSION #
15777299

 

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