Press Release Summary:
Model LTC3407 1.5 MHz synchronous-buck regulator operates from input voltage of 2.5-5.5 V, using constant-frequency, current-mode architecture. It generates 2 independent output voltages as low as 0.6 V, enabling it to power low-voltage DSPs and microcontrollers. Switching frequency of 1.5 MHz allows utilization of tiny ceramic capacitors and inductors less than 1.2 mm in height. Unit delivers low dropout, 100% duty cycle operation and efficiencies up to 96%.
Original Press Release:
Dual Synchronous Step-Down DC/DC Converter Delivers up to 600mA from Two Independent Channels
MILPITAS, CA - July 28, 2003 - Linear Technology announces the LTC3407, a dual output high efficiency, 1.5 MHz synchronous buck regulator, which delivers up to 600mA of continuous output current from two separate channels. Using a constant frequency, current mode architecture, the LTC3407 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 generates two independent output voltages as low as 0.6V, enabling it to power the latest generation of low voltage DSPs and microcontrollers. Its switching frequency of 1.5 MHz allows the utilization of tiny, low cost ceramic capacitors and inductors less than 1.2mm in height. The combination of dual architecture, tiny externals and an MSOP package make the LTC3407 the most compact synchronous step-down solution available for dual output voltage rails.
The LTC3407 uses internal switches with an RDS(ON) of only 0.35Ù to deliver efficiencies as high as 96%. It also features low dropout 100% duty cycle operation to allow output voltages equal to VIN, further extending battery run-time. No load quiescent current is only 40µA (both channels), and <1µA in shutdown, providing optimal battery life. The LTC3407 utilizes Automatic Burst Mode® operation to reduce gate charge losses when the load current drops below the level required for continuous operation, providing 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 LTC3407 is stable with ceramic capacitors, achieving very low output voltage ripple. For handheld applications that require dual outputs of up to 600mA, high efficiency and very small solution footprint, the LTC3407 is the ideal solution.
The LTC3407EMSE is available from stock in a thermally enhanced MSOP-10 package. Pricing starts at $2.60 each for the LTC3407 in 1,000-piece quantities.
Summary of Features: LTC3407
Dual 600mA (IOUT) Outputs
High Efficiency: Up to 96%
1.5 MHz Constant Frequency Operation
Only 40µA Quiescent Current (Both Channels) In Burst Mode Operation
2.5V to 5.5V Input Voltage Range
5V to 0.6V Output Voltage Range
Small 10-Lead Thermally Enhanced MSOP-10 Package
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.
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