The TPS40100 controller supports three common sequencing schemes found in today's high-performing power systems: sequential sequencing, ratio-metric sequencing and simultaneous sequencing. This enables designers to address the various sequencing requirements of complex systems with multiple output voltages without having to specify different controllers for each application. This saves time, design effort and cost—especially if power supply sequencing requirements change when a digital signal processor or a field-programmable gate array is changed mid-way through a design process. Using the device's 'power good' function, the TPS40100 can implement a sequential sequencing scheme, where a single power supply output voltage will ramp up and settle at its final regulation voltage before the next power supply voltage ramps up. By using a soft-start capacitor, the TPS40100 is able to implement a ratio-metric scheme that ramps up both power supply outputs proportionally, at the same time, until proper regulation is established. Finally, the device can effectively implement a simultaneous sequencing scheme through its integrated amplifier.

The TPS40100 manages power supplies up to 15 A with peak efficiencies of 90%. In addition, the synchronous peak-current mode controller with on-chip adaptive gate drive provides a peak current-mode control loop, which enables simple compensation that is insensitive to wide variations of output capacitance. The device is also equipped with supervisory and control features that are essential in today's power supplies.

The TPS40100 controller is available in volume from TI and its authorized distributors. Packaged in a 24-pin QFN, pricing is $1.45 each in quantities of 1000 units.

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