15VIN, 2.5A Synchronous Buck-Boost dc/dc Converter

Linear Technology's LTC3112 is a synchronous buck-boost converter thatdelivers up to 2.5A of output current from a wide range of power sources,including single or multiple cell batteries, super capacitor stacks and walladapters. Its 2.7 to 15V input range and 2.5 to 14V output range provides aregulated output with inputs above, below or equal to the regulated output. Thelow noise buck-boost topology incorporated in the LTC3112 provides a continuous, jitter-free transitionbetween buck and boost modes, making it ideal for RF and other noise-sensitiveapplications that must maintain a low-noise constant output voltage with avariable input power source. In many applications, battery run time issignificantly extended over step-down only solutions. The LTC3112's default 750kHz switching frequency, that can besynchronized to an external 300 KHz to 1.5 MHz clock and proprietary thirdgeneration buck-boost PWM circuitry provide low noise and high efficiency whileminimizing the size of external components. The combination of tiny externalsand a 4 x 5mm DFN or TSSOP-20E package provides a compact solution footprint.

The LTC3112 includes four internal low R_DS(ON)N-channel MOSFETs to deliver efficiencies of up to 95 percent. User-selectableBurst Mode operation lowers quiescent current to only 50 AmuA, improving lightload efficiency and extending battery run time. For noise-sensitiveapplications, Burst Mode operation can be disabled. The LTC3112 also offers an integrated output current monitorthat enables the load current to be monitored or controlled to a constantvalue. Other features include soft-start, overvoltage protection, short circuitprotection, thermal shutdown and output disconnect.

LTC3112EDHD is available in a 16-lead 4 x 5mm DFN package and the LTC3112EFE isavailable in a thermally enhanced 20-lead TSSOP package. Pricing starts at$4.00 each and $4.15 each, respectively for 1,000 piece quantities. Industrialgrade versions, the LTC3112IDHD and LTC3112IFE, are guaranteed to operate overthe -40 to 125C operating junction temperature range and are priced at $4.40and $4.57 each, respectively, in 1,000-piece quantities.

15VIN, 2.5A Synchronous Buck-Boost dc/dc Converter