Texas Instruments Incorporated (TI) (NYSE: TXN) introduced a flexible, synchronous buck controller that simplifies power management design of LCD TVs and IP set-top boxes that use digital signal processors (DSPs) and FPGAs. TI’s new TPS40195 high-performance controller provides several features to enhance the power performance of a 4.5 V to 20 V system. For instance, the device uses the input voltage available for power conversion as its bias supply, eliminating the need for additional voltages to power the integrated circuit. The TPS40195, which comes in a 16-pin TSSOP package, also can switch 180 degrees out of phase when the bi-directional synchronization pin is used as an output to other buck controllers. This reduces bulk capacitance and saves board space and cost when using 5 V and 12 V power supplies. In addition, the TPS40195 lowers electromagnetic interference (EMI) when the pin is used as an input connected to a master clock.
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.
5-A SWIFT(TM) Converter for Digital TV and Set-Top Box Designs
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 SWIFT(TM) 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 PowerPad(TM) 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 uA.
Availability, Packaging and Pricing
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.
Analog and Digital Solutions for Digital TV
TI offers a wide range of complementary high-performance analog and digital signal processor (DSP) products for digital TVs, including digital media processors, video decoders, PurePath Digital(TM) audio amplifiers and power management. TI provides the silicon, software, systems expertise and support for the entire video signal chain, enabling customers to get to market quickly.