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Maxim announces new power supply tracker/sequencer

Posted: 25 Jan 2005 ?? ?Print Version ?Bookmark and Share

Keywords:maxim integrated products? eeprom? power supply tracker? sequencer? max6876?

Maxim Integrated Products unveiled an EEPROM-programmable, quad-voltage power supply device that monitors four voltages and ensures proper power-up and power-down conditions for systems requiring voltage tracking and/or sequencing.

The new MAX6876 chip allows key parameters such as voltage thresholds, slew rates, overcurrent limits and timing parameters to be programmed through an I?C interface and stored in internal EEPROM. It features programmable undervoltage and overvoltage thresholds in 10mV increments for each supply input. When all voltages are within their specifications, the device turns on external n-channel MOSFETs to track or sequence the voltages to the system. All the voltages can be tracked together, sequenced independently, or tracked and sequenced in various combinations.

During voltage tracking, the voltage at the gate of each MOSFET is increased to turn on the n-channel MOSFET. The voltage at the source of each MOSFET is measured to ensure that all voltages dynamically track to within 125mV of each other. If any supply fails to track within 250mV from the reference ramp, or if the voltage fails to power up within a specific time frame, a fault condition occurs and the power-up mode is terminated. Additionally, the MAX6876 offers a fast shut-off mode to prevent power-down problems. The device incorporates independent charge pumps to ensure that each external n-channel MOSFET is fully enhanced during normal operation.

Additional features of the MAX6876 include an auto-retry (or latch-off) mode, an overcurrent-detect feature, power-good output indicators, and a reset circuit. It also offers a synchronization feature that allows up to four devices to operate in a master/slave mode and thus track up to 16 voltages.

Available in a 6-by-6mm, 36-pin TQFN package, the MAX6876 is fully specified from -40C to 85C. Prices start at $6.39 (1,000-up, FOB USA). An evaluation kit with an easy-to-use graphical user interface is also available to help simplify design.

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