Whether your system has two voltage rails or dozens, Texas Instruments has a power sequencer to fit your requirements.
Power sequencing is an essential part of any design, especially in complex systems that utilize multiple power rails. Today's high-performance processing devices, such as FPGAs, ASICs, PLDs, DSPs, ADCs, and microcontrollers, require multiple voltage rails just to power their own internal circuitry, such as the core, memory, and I/O. These types of applications demand very specific voltage rail power-up and power-down sequencing in order to guarantee reliable operation, better efficiency, and overall system health.
TI offers the easiest method to control the power up and power down sequence of multiple power supplies. Discrete solutions with a combination of resistors and capacitors can provide power-up sequencing, but by themselves cannot provide a reverse sequence during power down. The LM3880 and LM3881 simple power supply sequencers offer:
Power sequencing with reset ICs
TI also offers a simple option to consider for power-up sequencing using reset ICs with adjustable timing. The family of TPS3860xx supervisors offers:
The UCD90xxx family of digital power supply sequencers, also known as system health monitors, provides a comprehensive digital solution for complex power systems:
TI's digital power supply sequencers offer the benefits of PMBus and digital power without changing your power tree.
|# Rails Sequenced||24||32||16||12||12||10||10||8|
|# of Monitor Inputs||24||32||16||13||13||11||13||8|
|ADC Ref Accuracy||External||External||0.5% Internal||0.5% Internal||0.5% Internal||0.5% Int ot Ext||0.5% Internal||External|
|ACPI Sleep State Control||Yes||Yes||Yes||Yes||No||Yes||No||No|
|Current and Temp||Yes||Yes||No||Yes||Yes||Yes||Yes||No|
|NV Fault Logs||100||100||18||16||10||15||20||8|
|Other NV Logging||Blackbox, Peaks, Resets, RTC||Blackbox, Peaks, Resets, RTC||Peaks, Resets, Run-time clock||Peaks, Resets, Run-time clock||Peaks, Resets, Run-time clock||Peaks, Resets, Run-time clock||Peaks, Resets, Run-time clock||N/A|
|Internal Temp Sensor||Yes||Yes||Yes||Yes||Yes||Yes||Yes||No|
|Communication and Programming I/F **||PMBus/I2C, JTAG||PMBus/I2C, JTAG||PMBus/I2C, JTAG||PMBus/I2C, JTAG||PMBus/I2C, JTAG||PMBus/I2C, JTAG||PMBus/I2C, JTAG||I2C|
|Package Type (size, mm)||157-ball BGA (9x9)||169NFBGA (12x12)||64-pin QFN(9x9)||64-pin QFN(9x9)||64-pin QFN (9x9)||48-pin QFN (7x7)||64-pin QFN (9x9)||32-pin QFN|