DC to DC Power Supplies (Converters)
Step-Down DC/DC Converter includes linear controller.
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Press Release Summary:
Housed in 3 x 3 mm DFN-12 package, Model LT1939 operates from VIN range of 3-25 V, making it suited for regulating power from variety of sources, including protected automotive batteries, industrial supplies, and unregulated wall adapters. Unit's 2.3 A internal switch delivers up to 2 A continuous output current at voltages as low as 0.8 V. Switching frequency is user programmable and synchronizable from 250 kHz to 2.2 MHz, enabling designers to avoid noise-sensitive frequency bands.
Original Press Release:
25V, 2A(I(OUT)), 2.2MHz Step-Down DC/DC Converter with Linear Controller in 3mm x 3mm DFN
MILPITAS, CA - February 7, 2008 - Linear Technology announces the LT1939, a 2A, 25V step-down switching regulator and a linear controller in a 3mm x 3mm DFN package. The LT1939 operates from a VIN range of 3V to 25V, making it suitable for regulating power from a wide variety of sources, including protected automotive batteries, industrial supplies and unregulated wall adapters. Its 2.3A internal switch can deliver up to 2A of continuous output current at voltages as low as 0.8V. Switching frequency is user programmable and synchronizable from 250kHz to 2.2MHz, enabling designers to optimize efficiency while avoiding critical noise-sensitive frequency bands. The integrated LDO controller, combined with an NPN transistor, ensures very low noise output from the primary channel or and alternatively can be used as a second channel. The LT1939's 3mm x 3mm DFN-12 package and high switching frequency, which keeps external capacitors and inductor small, provide a very compact, thermally efficient footprint.
The LT1939 utilizes a high efficiency 2.3A, 450mVCESAT switch with the necessary oscillator, control, logic circuitry and LDO controller integrated into a single die. Special design techniques enable high efficiency over a wide input voltage range while its current mode topology enables fast transient response and excellent loop stability. Other features include a power good flag and soft-start capability.
The LT1939EDD is priced starting at $3.05 each for 1,000-piece quantities. The LT1939IDD is tested and guaranteed to operate from a -40°C to 125°C operating junction temperature and is priced at $3.66 each. Both versions are available from stock.
Summary of Features: LT1939
o Wide Input Range: 3V to 25V
o Short-Circuit Protected Over Full Input Range
o 2A Output Current Capability
o Adjustable/Synchronizable Fixed Frequency Operation from 250kHz to 2.2MHz
o Soft-Start/Tracking Capability
o Output Adjustable Down to 0.8V
o Adjustable Linear Regulator/Driver with 13mA Output Capability
o Power Good Comparator with Complimentary Outputs
o Low Shutdown Current: 12uA
o Thermally Enhanced 3mm × 3mm DFN-12 Package
About Linear Technology
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. For more information, visit www.linear.com.
LT, LTC, LTM and are registered trademarks and uModule is a trademark of Linear Technology Corp.
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
