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7V, 500mA Synchronous Buck-Boost DC/DC Converter Provides Extended Battery Run Time in Handheld Applications

(PresseBox) (Milpitas,CA, ) Linear Technology announces the LTC3534, a 7V synchronous buck-boost converter that can delivers up to 500mA of output current to a regulated output above, below or equal to the input using a single inductor. The device's topology provides a continuous transfer through all operating modes making it ideal for three- or four- cell Alkaline/NiCad/NiMH or single cell lithium applications which must maintain a constant output voltage even as the battery voltage declines below the output. A typical application is alkaline cells with an input voltage range of 3.6V to 6.4V, powering a 5V output rail. In most cases this Buck-Boost DC/DC Converter can add up to 25% more battery run-time compared to a traditional SEPIC solution. The LTC3534's constant 1MHz switching frequency ensures low noise while minimizing the size of external components. The combination of tiny externals and a 3mm x 5mm DFN (or SSOP-16) provide a tiny solution footprint, typically required in handheld applications.

The LTC3534 includes two N-Channel MOSFETs and two P-Channel MOSFETs (215mOhm/275mOhm and 260mOhm, respectively) to deliver efficiencies of up to 94%. Burst Mode® operation requires only 25uA of quiescent current while shutdown current is less than 1uA, further extending battery run-time. If the application is noise sensitive, the PWM pin can also be configured to provide forced continuous operation to reduce noise and RF interference. Other features include soft-start, current limiting, thermal shutdown and output disconnect.

LTC3534EDD is available from stock in a 16-lead 3mm x 5mm DFN package, and the LTC3534EGN is available in a 16-lead SSOP package. Pricing for both versions is $3.15 each in 1,000 piece quantities. For more information, visit www.linear.com.

Summary of Features: LTC3534

- Regulated Output with Input Voltages Above, Below or Equal to the Output
- 2.4V to 7V Input & 1.8V to 7V Output Voltage Ranges
- 5V VOUT at 500mA from 4 AA Cells
- Single Inductor
- Synchronous Rectification: Up to 94% Efficiency
- Burst Mode® Operation with 25uA IQ
- Output Disconnect in Shutdown
- 1MHz Switching Frequency
- <1uA Shutdown Current
- Small Thermally Enhanced 16-Lead (3mm × 5mm × 0.75mm) DFN & 16-Lead SSOP Packages


Linear Technology Corporation, a manufacturer of high performance linear integrated circuits, was founded in 1981, became a public company in 1986 and joined the S&P 500 index of major public companies in 2000. Linear Technology products include high performance amplifiers, comparators, voltage references, monolithic filters, linear regulators, DC-DC converters, battery chargers, data converters, communications interface circuits, RF signal conditioning circuits, uModule(TM) products, and many other analog functions. Applications for Linear Technology's high performance circuits include telecommunications, cellular telephones, networking products such as optical switches, notebook and desktop computers, computer peripherals, video/multimedia, industrial instrumentation, security monitoring devices, high-end consumer products such as digital cameras and MP3 players, complex medical devices, automotive electronics, factory automation, process control, and military and space systems. LT, LTC, LTM and Burst Mode are registered trademarks and uModule is a trademark of Linear Technology Corp. All other trademarks are the property of their respective owners.

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