Linear Technology offers LT3741 DC/DC converter
Linear Technologycontact supplier
LT3741 DC/DC converter
The LT3741 from Linear Technology is a synchronous step-down DC/DC converter that is ideal for applications ranging from battery and supercap chargers and laser drivers to high-current LED lighting.
The LT3741 has been designed to accurately (+/-6 per cent) regulate output currents up to 20A.
It features a 6V to 36V input range, constant current and constant voltage operation.
The LT3741 uses two external switching Mosfets and delivers up to 20A of continuous output current over a wide voltage range of 0V to 34V.
Efficiencies as high as 95 per cent eliminate the need for external heat sinking.
The LT3741's frequency can be programmed and synchronised between 200kHz and 1MHz, allowing designers to optimise efficiency while minimising external component size.
Combined with a 4 x 4mm QFN-20 or thermally enhanced TSSOP-20 package, the LT3741 provides a highly compact constant voltage and current solution.
The LT3741 uses an average current mode control scheme to maintain inductor current regulation over a wide output voltage range of 0V to VIN-2V.
The regulated current is set by an analogue voltage on the CTRL pins and an external sense resistor.
The LT3741's topology enables it to both source and sink current.
Its regulated output voltage and overvoltage protection are set with an external voltage divider.
Additional features include an accurate external voltage reference, a programmable under-voltage lockout (ULVO) pin and thermal shutdown.
The LT3741EUF is available in a 20-pin 4 x 4mm QFN package and the LT3741EFE is available in a thermally enhanced TSSOP-20.
Extended temperature versions - 'I' Grades - the LT3741IUF and LT3741IFE, are also available.
Linear Technology has announced the LT8709, a synchronous PWM controller for negative-to-negative or negative-to-positive DC/DC conversion.
This application note describes a Linear Technology ‘Half-Flash’ A/D converter, the LTC1099, being connected to a 256 element line scan photodiode array.
Linear Technologies offers synthesiser core for generating and distributing low-jitter signals download
Linear Technology has launched the LTC6950, a low-phase-noise integer-N synthesiser core with an ultra-low jitter clock distribution output section. The LTC6950 is suitable for generating and distributing the low-jitter signals essential to clocking data converters with a high signal-to-noise ratio (SNR).
PC-board layout determines the success or failure of every power supply project. It sets functional, electromagnetic interference (EMI) and thermal behaviour. Switching power supply layout is not black magic, but is often overlooked until it is too late in the design process. Fortunately, physics is on your side.
The methods discussed in this article allow Linear Technology’s switched capacitor filters to be utilised as high-quality bandpass filters.