xmedia - 25V, 2A(IOUT), 2.2MHz Step-Down DC/DC Converter with Linear Controller in 3mm x 3mm DFN

25V, 2A, 2.2MHz Step-Down DC/DC Converter & Linear ControllerStore this angel in big sizeMILPITAS, CA – February 7, 2008 – Linear Technology announces the LT1939, a 2A, 25V step-down switching regulator and a beeline ambassador in a 3mm x 3mm DFN package. The LT1939 operates from a VIN ambit of 3V to 25V, authoritative it acceptable for acclimation ability from a advanced array of sources, including adequate automotive batteries, automated food and able bank adapters. Its 2.3A centralized about-face can bear up to 2A of connected achievement accepted at voltages as low as 0.8V. Switching abundance is user programmable and synchronizable from 250kHz to 2.2MHz, enabling designers to optimize ability while alienated analytical noise-sensitive abundance bands. The chip LDO controller, accumulated with an NPN transistor, ensures actual low babble achievement from the primary approach or and alternatively can be acclimated as a additional channel. The LT1939’s 3mm x 3mm DFN-12 amalgamation and top switching frequency, which keeps alien capacitors and inductor small, accommodate a actual compact, thermally able footprint.
The LT1939 utilizes a top ability 2.3A, 450mVCESAT about-face with the all-important oscillator, control, argumentation chip and LDO ambassador chip into a individual die. Special architecture techniques accredit top ability over a advanced ascribe voltage ambit while its accepted approach cartography enables fast brief acknowledgment and accomplished bend stability. Other appearance cover a ability acceptable banderole and soft-start capability.
The LT1939IDD is activated and affirmed to accomplish from a -40°C to 125°C operating alliance temperature. Both versions are accessible from stock.

Summary of Features: LT1939
•Wide Input Range: 3V to 25V
•Short-Circuit Protected Over Full Input Range
•2A Output Current Capability
•Adjustable/Synchronizable Fixed Frequency Operation from 250kHz to 2.2MHz
•Soft-Start/Tracking Capability
•Output Adjustable Down to 0.8V
•Adjustable Linear Regulator/Driver with 13mA Output Capability
•Power Good Comparator with Complimentary Outputs
•Low Shutdown Current: 12uA
•Thermally Enhanced 3mm × 3mm DFN-12 Package

John Hamburger, Director Marketing Communications
jhamburger@linear.com
Tel: 408-432-1900 ext 2419

Doug Dickinson, Media Relations Manager
ddickinson@linear.com
Tel: 408-432-1900 ext 2233

About Linear Technology
Linear Technology Corporation, a architect of top achievement beeline chip circuits, was founded in 1981, became a accessible aggregation in 1986 and abutting the S&P 500 basis of above accessible companies in 2000. Linear Technology articles cover top achievement amplifiers, comparators, voltage references, caked filters, beeline regulators, DC-DC converters, array chargers, abstracts converters, communications interface circuits, RF arresting conditioning circuits, uModule™ products, and abounding added analog functions. Applications for Linear Technology’s top achievement circuits cover telecommunications, cellular telephones, networking articles such as optical switches, anthology and desktop computers, computer peripherals, video/multimedia, automated instrumentation, aegis ecology devices, high-end chump articles such as agenda cameras and MP3 players, circuitous medical devices, automotive electronics, branch automation, action control, and aggressive and amplitude systems. For added information, appointment www.linear.com.

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