Dallas—Texas Instruments' TPS40140 PWM controller, touting a simpler approach to multiphase DC/DC topologies, can be scaled up in 16-phase blocks to facilitate 320-amp service. Indeed, more than a dual version of the company's previously released TPS40100, the chip offers a new take on previous multiphase controller topologies offered by International Rectifier and Linear Technology, says Tim Goodrow, product marketing manager for DC/DC controllers. More specifically, the stand alone "universal" chips will serve in a master or slave capacity, doing away with the need for such function-specific chips; the overall topology based on the new chips also eliminates the design considerations associated with timing using PLL synchronized clock-in, clock-out schemes.
"Power supply designers for high-performance data center and 3G base station applications face challenging requirements for higher power density, scalability, and high-efficiency operation," said Stephen Anderson, vice president of the system power management business. "TI's new stackable controllers will enable customers to meet those demands in an easy-to-use-modular approach."
Designers achieve "stacking" of these wide-input (2-40 volt), dual-output TPS40140 using a cascaded type arrangement, with minimal device-to-device wiring. As such, these chips, according to TI, facilitate automatic phase-balancing to significantly minimize ripple current at both input and output. Thus, associated input and output capacitors can be physically smaller. The system design will also be simpler for multiple output rail topologies (based on single-phase or multiphase outputs) that are both synchronized and phase-balanced, according to the company. Line and load regulation is 0.1 percent.
The TPS40140, which supports sequential, ratiometric, and simultaneous sequencing, includes complete supervisory and control features. These including pre-bias start-up capability, programmable under-voltage lockout, loss direct current resistance (DCR) and resistor current sensing, independent power-good indicators, programmable over-current protection and thermal shutdown.
Click here for the device datasheet. The TPS40140, packaged in a 6-by-6 mm, 36-pin QFN, has a suggested resale price of $3.30 each in 1k quantities. Software development tools will be available in Q4. Click here for evaluation modules, application notes, and reference designs.
Texas Instruments, 1-800-477-8924, www.ti.com