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Press release Box-ID: 55865

LINEAR TECHNOLOGY GmbH Oskar-Messter-Straße 24 85737 Ismaning, Germany http://www.linear.com
Contact Ralf Stegmann +49 7131 92340
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LINEAR TECHNOLOGY GmbH

750mA, 1.2MHz Synchronous Boost Regulator Offers Output Disconnect & Reverse Battery Protection in a 3mm x 3mm DFN

(PresseBox) (MILPITAS, )
Linear Technology Corporation announces the LTC3499/B, a 1.2MHz, current mode, synchronous boost DC/DC converter with true output disconnect, inrush current limiting and reverse battery protection. Its internal switches provide a 750mA current limit (min) and can deliver output voltages as high as 6V from an input voltage range of 1.8V to 5.5V, making it ideal for single cell Li-Ion and two or three dual cell alkaline/NiCd/NiMH applications.


The LTC3499/B delivers up to 175mA of continuous output current (at 5V) from dual alkaline cells. Synchronous rectification enables efficiencies of up to 94% while Burst Mode® operation lowers quiescent current to only 20uA, providing maximum battery run-time in handheld applications. For applications that require the lowest noise possible, the LTC3499B features continuous switching at light loads. The combination of a DFN or MSOP package and a constant switching frequency of 750kHz minimize both inductor and capacitor sizes, providing a tiny solution footprint required in handheld applications.


The LTC3499/B uses internal switches with an RDS(ON) of only 0.45 Ohm (N-Channel) and 0.58 Ohm (P-Channel) to deliver efficiencies as high as 94%. Reverse battery protection protects both the IC and the load when battery polarity is reversed, while the true output disconnect feature allows the output to be completely discharged in shutdown. This also limits the inrush of current during start-up, minimizing surge currents seen by the input supply. Additional features include over-voltage protection, programmable soft-start, and thermal protection. For boost applications, requiring up to 175mA of output current, where reverse battery protection, a small solution size and low maximum battery run-time are defining factors, the LTC3499/B delivers an ideal solution.


LTC3499EDD and LTC3499EMS8 are available from stock in 8-lead DFN or MSOP packages, respectively. Both have 1,000-piece pricing starting at $2.15 each. The “B” versions, LTC3499BEDD and LTC3499BEMS8, are also available from stock in 8-lead DFN or MSOP packages, respectively. 1,000-piece pricing starts at $2.15 each.


Photo Caption: 750mA, 1.2MHz Synchronous Boost Regulator with Reverse
Battery Protection


Summary of Features: LTC3499/B

• Reverse-Battery Protection for DC/DC Converter and Load
• High Efficiency: Up to 94%
• Generates 5V at 175mA from a 1.8V Input
• Operates from 1.8V to 5.5V Input Supply
• 2V to 6V Adjustable Output Voltage
• Inrush Current Controlled During Start-Up
• Output Disconnect in Shutdown
• Low Noise 1.2MHz PWM Operation
• Tiny External Components
• Automatic Burst Mode Operation (LTC3499)
• Continuous Switching at Light Loads (LTC3499/B)
• Overvoltage Protection
• 8-Lead (3mm x 3mm x 0.75mm) DFN and MSOP Packages

LINEAR TECHNOLOGY GmbH

Die Firma Linear Technology Corporation, Hersteller von hochleistungsfähigen Linear-ICs, wurde 1981 gegründet, ging 1986 an die Börse und wurde im Jahr 2000 in den S&P-500-Index bedeutender börsennotierter Unternehmen aufgenommen. Linear Technology produziert u. a. Präzisionsverstärker, Komparatoren, Spannungsreferenzen, monolithische Filter, Linearregler, Gleichspannungswandler, Batterieladegeräte, Datenkonverter, Kommunikationsschnittstellen-ICs, HF-Signalaufbereitungs-ICs, uModuleTM-Produkte und viele andere Analog-ICs. Typische Anwendungsbereiche für die hochleistungsfähigen ICs von Linear Technology sind: Tele-kommunikation, Handys, Netzwerkprodukte wie z. B. optische Schalter, Notebook- und Desktop-Computer, Computerperipheriegeräte, Video/Multimedia-Geräte, industrielle Mess-systeme, Sicherheits- und Überwachungseinrichtungen, hochwertige Consumer-Produkte wie z. B. Digitalkameras und MP3-Player, komplexe medizinische Geräte, Automobilelektronik, Fabrikautomatisierung, Prozesssteuerung sowie militärische Systeme und Luft-/Raumfahrt. Weitere Informationen finden Sie unter www.linear.com.

LT, LTC, LTM, Burst Mode und sind eingetragene Marken und uModule ist eine Marke der Firma Linear Technology Corp. Alle anderen Marken sind Eigentum der jeweiligen Inhaber.

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The publisher indicated in each case is solely responsible for the press releases above, the event or job offer displayed, and the image and sound material used (see company info when clicking on image/message title or company info right column). As a rule, the publisher is also the author of the press releases and the attached image, sound and information material. The use of information published here is generally free of charge for personal information and editorial processing. Please clarify any copyright issues with the stated publisher before further use. In case of publication, please send a specimen copy to service@pressebox.de.