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LDO regulator delivers adjustable output

Posted: 15 Oct 2008     Print Version  Bookmark and Share

Keywords:LDO  voltage regulator  adjustable output  ground current 


Vishay Intertechnology Inc. has extended its LDO product family portfolio with the release of SiP21110 250-mA LDO voltage regulator. The device features a low 35-µA typical ground current at a 1-mA load in thin SOT23-5L package.

Vishay says that the SiP21110's ultra-low ground current helps to extend battery run times between charges in battery-operated power systems and portable electronics, such as cell phones and wireless handsets, PDAs, digital cameras, pagers, wireless modems, and medical handheld devices.

The SiP21110 features adjustable output from 1.3V to 5V with an external resistor network, and a high 1.0 per cent output voltage accuracy at +25°C. Vishay claims that the device's design architecture allows stable operation with very small, low-ESR ceramic output capacitors, reducing board space and component cost. Additional SiP21110 features include low peak-to-peak transient output voltage with fast recovery time, as well as high PSRR, while consuming a minimum of current.

The device is designed to maintain regulation while delivering 330-mA typical peak current for systems with a high surge current upon turn-on. During start-up, an active pull-down circuit improves the output transient response and regulation. In shutdown mode, the output automatically discharges by connecting the output to ground through a 100-Ω n-channel MOSFET.

For safe operation, the device offers thermal overload (+160°C typical) and built-in short circuit protection (500mA typical), with a 1-µA maximum shutdown current at +85°C. The SiP21110 operates over a junction temperature range of -40°C to +125°C.

Samples and production quantities of the new SiP21110 LDO voltage regulator are available, with lead times of eight weeks for larger orders.

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