Buck-Boost Battery Charger eliminates DC/DC converter.

Press Release Summary:



Model LTC1980 switching regulator battery charger combines battery charging and system power supply functions into small 24-lead SSOP. It operates from regulated or unregulated input supply voltage, which can be above or below battery voltage by automatically performing step-up or step-down DC/DC conversion. Stand-alone, single- and dual-cell Li-Ion charger also charges NiCd, NiMH and lead-acid batteries. Wall adapter can provide simultaneous charging and regulation.



Original Press Release:



Double Duty, Buck-Boost Battery Charger Eliminates System DC/DC Converter



MILPITAS, CA - June 25, 2003 - Linear Technology Corporation introduces the LTC1980, a switching regulator battery charger that combines both battery charging and system power supply functions into a small 24-lead SSOP. The LTC1980 operates from a regulated or unregulated input supply voltage, which can be above or below the battery voltage by automatically performing step-up or step-down DC/DC conversion. The versatile LTC1980 is not only a stand-alone single- and dual-cell Li-Ion battery charger, but it also charges NiCd, NiMH and lead-acid batteries.

The power path function integrated into the LTC1980 supports simultaneous battery charging and system voltage regulation from an input source such as a wall adapter. Examples of the applications for this simple and compact design include industrial handheld computers, memory backup boards, RAID systems, servers, uninterrupted power supplies, medical equipment and charging cradles.

The LTC1980 uses a current mode flyback topology for high efficiency, excellent transient response and design simplicity. It shares the discrete components for both the battery charger and the DC/DC converter, thereby minimizing size and cost relative to dual controller solutions. Optional Burst Mode® operation and power-down mode allow power density, efficiency and output ripple to be tailored to the application. The IC also incorporates automatic battery recharging, shorted-cell detection, C/10 and wall plug detect outputs are also provided.

Pricing starts at $3.75 each in 1,000-piece quantities.

Summary of Features: LTC1980
Single Controller IC Includes Battery Charger and DC/DC Converter
Wall Adapter Voltage May Be Above or Below Battery Voltage
Allows Simultaneous Charging and Regulation from Wall Adapter Input
Standalone Li-Ion Battery Charger
Simple NiMH and NiCd Battery Charger
High Efficiency Current Mode 300kHz PWM
Small 24-Lead SSOP

Company Background
Linear Technology Corporation was founded in 1981 as a manufacturer of high performance linear integrated circuits. Linear Technology products include operational, instrumentation and audio amplifiers; voltage regulators,power management devices, DC-DC converters and voltage references; comparators; monolithic filters; communications interface circuits; one-chip data acquisition sub-systems; pulse-width modulators and sample-and-hold devices; and high frequencydevices. Applications for Linear Technology's high performance circuits include wireless and broadband telecommunications infrastructure, cellular telephones, networking products and satellite systems, notebook and desk top computers, computer peripherals, video/multimedia, industrial and medical instrumentation, automotive electronics, factory automation, process control, military and space systems, and high-end consumer products including digital cameras, MP3 players and other electronic products.

READER SERVICE: Call toll-free 1-800-4-LINEAR (for literature only), or go to the company's web site: www.linear.com

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