Linear Technology Introduces High-Efficiency, 4MHz Synchronous Dual-Output Step-Down Regulator LTC7124

17V, 4MHz, Dual Output 3.5A Synchronous Step-Down Regulator with Spread Spectrum Modulation Reduces EMI

Linear Technology Corporation introduces the LTC7124, a high efficiency, 4MHz synchronous dual output buck regulator that uses a constant frequency, peak current mode architecture. The device is available in a compact package with a footprint of 3mm x 5mm, providing up to 3.5A of continuous output current per channel, or a two-phase single output up to 7A. The LTC7124 operates from an input voltage range of 3.1V to 17V, with an output voltage range of 0.6V to 99% of VIN, with a high ±1% VOUT accuracy, making it ideal for 1- to 4-cell Li-Ion battery applications and 5V and 12V Intermediate bus system. Other key applications include battery-powered systems, point-of-load power supplies, portable instruments, and handheld scanners.

The LTC7124 uses internal N-channel MOSFET switches with RDS(ON) of only 80mΩ and 40mΩ per channel to provide up to 95% efficiency. Both channels operate at 180 degrees in phase to minimize input and output capacitor size. User-selectable Burst Mode operation maximizes efficiency at light loads, requiring only 8μA of quiescent current when both channels are enabled and only 5.5μA of quiescent current when one channel is enabled. Other features include input over-voltage and over-temperature protection, a power good voltage monitor, an independent soft-start function for each channel, internal or external loop compensation, programmable current limiting, and short-circuit protection.

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Author：Brittany Antonia （The author of article owns the copyright.）