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DC/DC converters deliver buck regulator performance

Posted: 03 Mar 2006     Print Version  Bookmark and Share

Keywords:Linear Technology  DC/DC converter  LTC3705  LTC3725  LTC3706 

 Linear Tech DC/DC converters

Linear Technology Corp. has introduced a family of DC/DC converters that offers the performance and simplicity of a buck (step-down) regulator for the design of isolated power supplies. These primary- and secondary-side ICs introduce PolyPhase operation for current sharing and paralleling of two circuits to achieve higher output current. Other advantages include self-starting capability, which eliminates the need for an extra transformer winding; no optocoupler design; fast transient response; and synchronous rectiflation for high efficiency operation, said the press release.

The chipset supports standard output voltages such as five, 12, 28 and 52V as well as low voltages down to 0.6V. In addition, said Linear Tech, they allow the use of inexpensive and off-the-shelf magnetics and discrete components.

The primary-side controllers, the LTC3705 and LTC3725, are forward drivers. The LTC3705 is a dual switch driver, while the LTC3725 is the simpler version with single-switch operation. The secondary-side ICs, the LTC3706 and LTC3726, are current mode synchronous rectifiers with a self-starting architecture. The LTC3706 is suitable for PolyPhase operation whereas the LTC3726 is simpler and is designed for single-phase operation. To further simplify the design, a proprietary technique is used to multiplex gate drive signals and DC bias power across the isolation barrier through a single, tiny pulse transformer.

The 1,000-piece price per unit for the LTC3705, LTC3706, LTC3725 and LTC3726 ICs are Rs.116.38 ($2.63), Rs.171.69 ($3.88), Rs.113.28 ($2.56) and Rs.141.16 ($3.19), respectively.

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Related Datasheets
Part Number Description Category
LTC3706 Secondary-Side Synchronous Forward Controller with Polyphase Capability ICs, Interface
LTC3705 2-Switch Forward Controller and Gate Driver ICs, Interface
LTC3726 Secondary-Side Synchronous Forward Controller ICs, Interface
LTC3725 Single-Switch Forward Controller and Gate Driver ICs, Interface



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