The controller provides excellent current detection at low duty cycles and limits energy into the system with an over-current sensing feature for both high- and low-side MOSFETs. The TPS40195 also supports control and protection features, such as shutdown control, power good output, adjustable under-voltage lockout, selectable digital soft start, programmable closed-loop soft start and short-circuit protection.
Power system designers can optimize the TPS40195 for efficiency or solution size by programming the switching frequency from 250 kHz to 600 kHz, or the controller can be synchronized via an external clock. By integrating the bootstrap diode, the device reduces system cost and saves board space.
TI also introduced the TPS5450, a new 5-A, non-synchronous step-down converter if a designer wants to further reduce complexity and external component count in their end-equipment design. The newest SWIFTT DC/DC converter integrates a low-resistance, high-side N-channel MOSFET, and provides tight voltage regulation accuracy under transient conditions. Available in an easy-to-use, eight-pin SOIC PowerPadT package, the TPS5450 supports a wide input voltage range of 5.5 V to 36 V and features a low shutdown quiescent current of 18 µA.
The new TPS40195 and TPS5450 controllers are available in volume from TI and its authorized distributors. Suggested retail pricing per quantities of 1,000 units begins at $1.50 each for the TPS40195 and $2.25 each for the TPS5450.