PRESSEMITTEILUNGEN

(pressebox) MILPITAS, CA, 01.04.2009, Linear Technology Corporation announces the H-Grade version of the LTC3805/-5 current mode programmable frequency flyback controllers. These devices contain all the features necessary to design high efficiency single-ended isolated and non-isolated flyback converters for telecom, datacom, Power-over-Ethernet (PoE), automotive and general housekeeping power supplies. With its ultralow 40uA start-up current, the LTC3805/-5 allows the use of a high-value input resistor and a low-value capacitor for low power dissipation and quick power supply start-up. The LTC3805H-5 differs from the LTC3805H with its lower turn-on voltage of 4.5V instead of 8.4V.

These parts are ideal for wide input voltage range applications, enabling users to have one power supply for both 48V (36V-75V) and 24V (18V-36V) nominal input systems. The operating frequency is selectable from 70kHz to 700kHz by one external resistor or for noise-sensitive requirements the device can be synchronized to an external clock over the same range. With a standby quiescent current of only 360uA, the LTC3805/-5 is an excellent choice for automotive applications.

The H-Grade products are tested and guaranteed to a junction temperature of +150°C, compared to the E and I Grade versions, which are specified for +85°C and +125°C maximum operating temperatures, respectively. The LTC3805 H-Grade version is ideal for automotive and industrial applications, which are subjected to high ambient temperatures.

Both the LTC3805H and LTC3805H-5 are available from stock in the thermally enhanced MSOP-10 package. Pricing starts at $1.76 each for 1,000 piece quantities. For more information, visit www.linear.com.

Summary of Features: LTC3805H/-5

-Start up Current of 40uA
-VIN and VOUT Limited Only by External Components
-Programmable Turn-On Voltage
-Adjustable Slope Compensation
-Programmable Soft Start
-Current Mode Control
-70kHz to 700kHz Programmable Constant Frequency Operation
-Synchronizable up to 700kHz
-Thermally Enhanced MSOP-10 PackageÜber LINEAR TECHNOLOGY GmbH

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 and LTM are registered trademarks and µModule is a trademark of Linear Technology Corp. All other trademarks are the property of their respective owners.

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