Linear Technology's LTC3112 is a synchronous buck-boost converter that
delivers up to 2.5A of output current from a wide range of power sources,
including single or multiple cell batteries, super capacitor stacks and wall
adapters. Its 2.7 to 15V input range and 2.5 to 14V output range provides a
regulated output with inputs above, below or equal to the regulated output. The
low noise buck-boost topology incorporated in the LTC3112 provides a continuous, jitter-free transition
between buck and boost modes, making it ideal for RF and other noise-sensitive
applications that must maintain a low-noise constant output voltage with a
variable input power source. In many applications, battery run time is
significantly extended over step-down only solutions. The LTC3112's default 750kHz switching frequency, that can be
synchronized to an external 300 KHz to 1.5 MHz clock and proprietary third
generation buck-boost PWM circuitry provide low noise and high efficiency while
minimizing the size of external components. The combination of tiny externals
and a 4 x 5mm DFN or TSSOP-20E package provides a compact solution footprint.
The LTC3112 includes four internal low RDS(ON)
N-channel MOSFETs to deliver efficiencies of up to 95 percent. User-selectable
Burst Mode operation lowers quiescent current to only 50 ÂµA, improving light
load efficiency and extending battery run time. For noise-sensitive
applications, Burst Mode operation can be disabled. The LTC3112 also offers an integrated output current monitor
that enables the load current to be monitored or controlled to a constant
value. Other features include soft-start, overvoltage protection, short circuit
protection, thermal shutdown and output disconnect.
LTC3112EDHD is available in a 16-lead 4 x 5mm DFN package and the LTC3112EFE is
available in a thermally enhanced 20-lead TSSOP package. Pricing starts at
$4.00 each and $4.15 each, respectively for 1,000 piece quantities. Industrial
grade versions, the LTC3112IDHD and LTC3112IFE, are guaranteed to operate over
the -40 to 125C operating junction temperature range and are priced at $4.40
and $4.57 each, respectively, in 1,000-piece quantities.
At this year's MD&M West show, lots of material suppliers are talking about new formulations for wearables and things that stick to the skin, whether it's adhesives, wound dressings, skin patches and other drug delivery devices, or medical electronics.
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