A synchronous dual output buck regulator from Analog Devices incorporates a constant frequency and peak current mode architecture, while optional spread spectrum frequency modulation is integrated for reducing radiated and conductive EMI noise.

The LTC7124 can deliver up to 3.5A of continuous output current from each channel or generate a 2-phase single output up to 7A. The switching frequency is user programmable from 500kHz to 4MHz, enabling the use of tiny, low cost capacitors and inductors; also included is external clock synchronisation capability for noise-sensitive applications, according to the company.

The LTC7124 operates from an input voltage of 3.1V to 17V with an output voltage range of 0.6V to 99% of VIN, with high ±1% VOUT accuracy, ideal for 1-4 cell Li-ion applications as well as 5V and 12V intermediate bus systems. Other key applications include battery-powered systems, point-of-load supplies, portable instruments and handheld scanners.

Each channel of the LTC7124 uses internal N-channel MOSFET switches with RDS (ON) of 80mΩ and 40mΩ to deliver efficiencies as high as 95%. The two channels run 180 degrees out-of-phase, minimising the size of both input and output capacitance. User-selectable Burst Mode operation is used to maximise light load efficiency, requiring only 8µA with both channels enabled and only 5.5µA of quiescent current with one channel enabled.

For applications requiring the lowest possible noise, the LTC7124 can be configured to run in forced continuous operation, reducing output voltage ripple and potential RF interference, according to Analog Devices. Additional features include input overvoltage and overtemperature protection, power good voltage monitors, independent soft-start capability for each channel, internal or external loop compensation, programmable current limit and short-circuit protection.

The LTC7124 is available in a thermally enhanced 3mm x 5mm QFN-24 package. E- and I-grade versions are capable of operating over the -40°C to 125°C operating junction temperature. The E-grade is priced starting at $4.05 each in 1,000-piece quantities.

Aside from the LTC7124, Analog Devices has also introduced a half-duplex transceiver that withstands up to ±40kV HBM and a step-down regulator that maintains 400mV dropout voltage.