Dallas—Texas Instruments' wide-input TPS5430 SWIFT (switcher with integrated FETs) converter delivers 3 amps at greater than 90 percent efficiency for consumer electronics and industrial point-of-load power systems. A second converter, the company's low-input TPS5413 synchronous step-down device, provides similar output for 5- and 3.3-volt distributed power systems and broadband and networking infrastructure.
The TPS5430, a nonsynchronous step-down DC/DC working from a 5.5- to 36-volt input, features 2 percent output voltage accuracy (down to 1.23 V). It's rated for full output over -40 to +125°C, and thus serves in environments where good thermal performance is needed, such as for a digital TV's liquid crystal display operating without the use of a cooling fan. The TPS5430 is also suited to powering set-top boxes, DVDs, DSPs, and FPGAs. Additionally, for applications that require higher output voltage levels such as high power LED or automotive systems, the TPS5430 can step-down voltages as high as 30 volts. The device’s switching frequency is preset to 500 kHz to minimize the size of external components. All compensation components are integrated into the TPS5430, cutting the required number of external parts to seven in a typical application.
The second chip, the TPS54317 synchronous, step-down DC/DC converter, can be synchronized up to 1.6 MHz. Working from a 3- to 6-volt input, the switcher also delivers 3 amps continuous (4 amps peak). It can deliver an output voltage down to 0.9 volts.
Interactive software and other design resources for these chips are available using the SWIFT Software Tool, available free through www.ti.com/swift.The tool provides a bill of materials, reference schematic, loop response graphs and an efficiency curve based on the designer’s inputs. Additionally, more than a dozen application notes and evaluation modules on TI’s TPS54xxx family of SWIFT ICs guide designers through such topics as sequencing, adjusting the output compensation and designing with high-frequency applications.
Click here for the TPS5430 datasheet and here for the TPS54317 datasheet. The TPS5430, in an 8-pin HSOIC package, and the TPS54317, in a 4-by-5 mm 24-pin QFN package, are priced at $1.85, and $2.50 each, respectively, both in quantities of 1,000 units.
Evaluation boards, the TPS5430EVM-136 and TPS54317EVM-159, are available for $10 each through www.ti.com/swift.
Texas Instruments, 1-800-477-8924, www.ti.com