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LDO regulator improves battery life of portable apps

Posted: 02 May 2006 ?? ?Print Version ?Bookmark and Share

Keywords:AS13985? low dropout regulator? LDO? austriamicrosystems?

austriamicrosystems introduced a low dropout (LDO) regulator, which is said to improve operating times in battery-powered portable equipment such as PDAs, digital cameras, Bluetooth and GPS modules. The devices are designed to extend the talk and standby time of cellphones.

The AS13985 LDO regulator is sold in a miniature wafer level chip-scale package (WL-CSP). This means the silicon itself is placed directly on the PCB. The device has low noise of 30Vrms between 10Hz and 100kHz. This is said to allow the use of a small and less cheap 1F ceramic output capacitor. The product has a supply voltage rejection performance of 60dB at 1kHz and 55dB at 10kHz.

A digital enable pin with a turn-on time of 150s allows system-level dynamic power management. The AS13985 LDO regulator features a voltage drop of 45mV at 150mA output current, going down to 0.3mV at 1mA. It offers over-temperature and over-current protection.

With an operating input voltage between 2.5V and 5.5V, the AS13985 LDO regulator is available in a variety of pre-programmed output voltages from 1.2V to 5V. The output voltage is regulated with an accuracy of 1 percent. The AS13985 is available in a 1-by-1.4mm five bumps WL-CSP, which is said to be 15 percent of the size of a standard SOT23 package.

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