Highly Efficient Converter Eases Power Design, Provides Low Voltage Regulation for Space-Constrained Power Systems
Nov. 18, 2003 - Texas Instruments Incorporated (TI) announced a new highly efficient DC/DC converter with an internal MOSFET that supports an input voltage from 4.5 V to 20 V at a continuous output current of 3-A in a small 16-pin HTSSOP package. The new device simplifies point-of-load power management design by allowing designers to power digital signal processors (DSPs), field programmable gate arrays (FPGAs) and microprocessors directly from a mid-voltage bus, instead of relying on an additional low-voltage bus. (See power.ti.com/sc03223.)
The TPS54350 integrates a high-side MOSFET and a gate driver for an optional low-side external MOSFET. The device also features a high performance voltage error amplifier that enables maximum performance under transient conditions and flexibility when choosing the output filter inductors and capacitors. The switching frequency can be fixed at 250 kHz or 500 kHz or adjusted up to 700 kHz to reduce the size of passive components.
The new SWIFT device, which supports high efficient synchronous or low cost non-synchronous operation, comes with an interactive software development tool and evaluation module that helps power system level designers meet aggressive equipment development cycles. The software, available free through power.ti.com/swift, provides a bill of materials, reference schematic, loop response graphs and an efficiency curve based on the designer's inputs.
Key Features of TPS54350:
- Greater than 90 Percent Efficiency at 3-A Continuous Output Current
- Input Voltage Range of 4.5 V to 20 V
- Output Voltage Adjustable Down to 0.891 V with One Percent Accuracy
- Programmable Synchronization to External Clock
- Wide Pulse Width Modulation (PWM) Frequency - Fixed 250 kHz, 500 kHz or Adjustable 250 kHz to 700 kHz
- Load Protected by Peak Current Limit and Thermal Shutdown
- Adjustable Under-Voltage Lockout
- Internal Soft Start
- Power Good Output
Availability, Pricing, Packaging
The TPS54350 is available now in volume from TI and its authorized distributors. The device is packaged in 16-pin HTSSOP with PowerPADTMfor thermal enhancement and space savings. Suggested resale pricing is $2.45 each in quantities of 1,000. Fixed output voltage versions will be available in the first quarter of 2004.
