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.
Related images
More stories
Application note: parasitic capacitance effects in step-up transformer design download
Transformers have parasitic components that can cause them to deviate from their ideal characteristics, and the parasitic capacitance associated with the secondary can cause large resonating current spikes on the leading edge of the switch current waveform. These spikes can cause the regulator to exhibit erratic operating conditions that manifests itself as duty-cycle instability. Attention to transformer design will cure this problem.
Linear Technology releases synchronous buck converter suitable for always-on applications downloadweblink
Linear Technology has released the LTC3639, a 150V input-capable synchronous buck converter that delivers up to 100mA of continuous output current. The device’s internal high side and synchronous power switches, drawing only 12µA at no load while maintaining output voltage regulation, make it suitable for always-on battery-powered applications.
Data sheet: LTC3639 synchronous buck converter from Linear Technology download
The LTC3639 from Linear Technology is a 150V input-capable synchronous buck converter that delivers up to 100mA of continuous output current.
Application note: fast charge circuits for nickel cadmium batteries downloadweblink
According to Linear Technology, the safe, fast charging of nickel cadmium (NiCad) batteries is required for many applications. A short charge time requires high current. A potential difficulty with high-current charging is battery heating. Excessive internal heating degrades the battery and can cause gas venting to the outside atmosphere. Fast charge schemes based on monitoring cell voltage during charge suffer because cell voltage is not necessarily indicative of the battery’s charge ...
Linear Technology releases µmodule regulator featuring differential remote-sense amplifier downloadweblink
Linear Technology has launched the LTM4637, a 20A DC/DC step-down µmodule regulator suitable for applications such as industrial and medical equipment and networking and telecommunications systems.