Power sequencers watch over DC/DC convertors

Xicor has a new family of time-based power sequencers that can sequence and monitor five independent DC/DC convertors via an SMBus interface.

Xicor has a new family of time-based power sequencers that can sequence and monitor five independent DC/DC convertors via an SMBus interface.

Sequence delays as well as other power management functions can be programmed into on-chip EEPROM.

This function allows sequencing and monitoring features to be customised at the board level for optimal power management performance.

Dubbed X80140 series, X80130 series and X80120 series, the devices' power supply sequencing provides systematic on/off control of DC/DC convertors on line cards and other devices.

Xicor's power sequencing products yield flexible designs that support both parallel and relay timing configurations.

Multiple devices can be cascaded to support more complicated time-based sequencing designs.

In addition, Xicor's new sequencing products provide maximum compatibility with existing boards with previous hot-swap solutions.

Xicor's X80140, X80130, and X80120 series contain quad, triple and dual voltage monitors, respectively.

Independent voltage monitors, integrated voltage references and comparators can be programmed to different voltage trip points between 0.9 to 5V.

Each device has a unique set of voltage trip points that initiate time delays.

The device's time-base sequencers offer a choice of two to four time delay circuits with SMBus selectable time delay between 100ms and 5s.

Timeout pin indicators are provided as well as on-chip oscillator and dividers.

System management functions include integrated power on reset with selectable delay, manual reset, and a fault detection register that provides additional control and monitoring of each timer and voltage supervisor via the SMBus.

The devices also include 2Kbit of customer accessible EEPROM for storing timing information, manufacturing information and other calibration data.

The new family of products complements Xicor's existing family of power management products that includes hot-swap products, sequencing products, and combination products that integrate both functions on a single chip.

A unique customer benefit is the flexibility of feature selection through either board hardware components or by SMBus software.

Xicor's power sequencing devices can be used in various applications for communications, consumer, and industrial markets.

End applications include routers, Gigabit Ethernet, cellular basestations, mass-storage devices, industrial or process controllers, ATE or data acquisition equipment and multiprocessor servers.

Production samples are available in 20-lead QFN packaging.

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