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Switching regulator controller requires no sense resistors

Posted: 24 Nov 2005 ?? ?Print Version ?Bookmark and Share

Keywords:Linear Technology? LTC3736-2? switching regulator controller?

The new 2-phase dual synchronous step-down switching regulator controller from Linear Technology Corp. features an output tracking that drives a wide range of external power MOSFETs. The LTC3736-2's 2.75V to 9.8V input range enables it to operate from a wide range of inputs, from single cell Li-ion, multicell NiCd/NiMH, as well as fixed 5V inputs. This device can also deliver outputs as low as 0.6V.

According to the press release, the LTC3736-2's constant frequency current mode architecture with MOSFET VDS sensing eliminates the need for sense resistors while improving efficiency. By operating the two controllers out of phase, both power loss and noise due to the ESR of the input capacitance are minimized.

The LTC3736-2's switching frequency can be programmed up to 750kHz, allowing the use of small surface mount inductors and capacitors. For noise sensitive applications, the LTC3736-2 switching frequency can be externally synchronized from 250kHz to 850kHz, utilizing a phase locked loop. Pulse skipping operation provides high efficiency at light loads while 100 percent duty cycle capability provides low dropout operation, extending operating time in battery-powered systems. Other features include an internal soft-start, Power Good Output voltage monitor and overvoltage protection.

The LTC3736EUF-2 is available from stock in a 4-by-4mm QFN-24 package. Pricing starts at $3.90 each for 1,000-piece quantities.

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Related Datasheets
Part Number Description Category
? LTC3736-2 Dual 2-Phase, No RSENSE Synchronous Controller with Output Tracking ICs, Interface



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