Step-Down DC/DC Converter produces 800 mA current.

Press Release Summary:




Housed in MSOP and 3 x 3 mm DFN packages, LTC3407-2 synchronous buck regulator delivers up to 800 mA continuous output current from 2 separate channels. It uses constant frequency and current mode architecture and operates from 2.5-5.5 V input voltage. Delivering efficiencies up to 95%, converter can generate 2 independent output voltages as low as 0.6 V, while 2.25 MHz switching frequency keeps switching noise out of AM and xDSL frequency bands.



Original Press Release:



2.25MHz Dual 800mA Synchronous Step-Down DC/DC Converter



MILPITAS, CA - May 10, 2004 - Linear Technology Corporation announces the LTC3407-2, a dual output, high efficiency, 2.25 MHz synchronous buck regulator that delivers up to 800mA of continuous output current from two separate channels. Using a constant frequency and current mode architecture, the LTC3407-2 operates from an input voltage range of 2.5V to 5.5V making it ideal for single cell Li-Ion, multi-cell alkaline or NiMH applications. The LTC3407-2 can generate two independent output voltages as low as 0.6V, enabling it to power the latest generation of low voltage DSPs and microcontrollers. Its 2.25 MHz switching frequency of keeps switching noise out of critical AM and xDSL frequency bands and allows the use of tiny, low cost ceramic capacitors and inductors less than 1.2mm in height. The LTC3407-2 is the most compact synchronous step-down solution available for dual output voltage rails, with its tiny externals and MSOP-10 and 3mm x 3mm DFN packages.

The LTC3407-2 uses internal switches with an RDS(ON) of only 0.35 Ohms to deliver efficiencies as high as 95%. It utilizes low dropout 100% duty cycle operation for output voltages up to VIN, further extending battery run-time. No load quiescent current is only 40uA (both channels) and <1uA in shutdown, ensuring optimal battery life. The LTC3407 features automatic Burst Mode® operation to reduce gate charge losses when the load current drops below the level required for continuous operation, for optimum efficiency at light loads. If the application is noise sensitive, the user can disable the Burst Mode operation, replacing it with a lower noise pulse-skipping mode. Other features include short-circuit protection, power-on/reset outputs, and optional external synchronization capability. Furthermore, the LTC3047-2 is stable with ceramic capacitors, achieving very low output voltage ripple. For handheld applications that require dual outputs of up to 800mA, high efficiency, and a very small solution footprint, the LTC3407-2 is the ideal solution.

The LTC3407EMSE-2 is available from stock in a thermally enhanced MSOP-10 package. LTC3407EDD-2 is available from stock in a low profile (0.75mm) 3mm x 3mm DFN package. Both are priced from $2.95 each in 1,000-piece quantities.

Summary of Features: LTC3407-2

High Efficiency: Up to 95%

Very Low Quiescent Current: Only 40uA: ISD <1uA

2.25MHz Constant Frequency Operation

High Switch Current: 1.2A Per Channel

Low RDS(ON) Internal Switches: 0.35 Ohms

Current Mode Operation for Excellent Line & Load Transient Response

Low Dropout Operation: 100% Duty Cycle

Output Voltages from 5V down to 0.6V

Small Thermally Enhanced MSOP and 3mm x 3mm DFN Packages

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.

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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