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Dual non-synchronous PWM buck regulators

Micrel has unleashed a family of dual non-synchronous PWM buck regulators. Operating at 2 and 4MHz, with a maximum load current of 2A per channel, the MIC4742 (2MHz) and MIC4744 (4MHz) are the new additions to the low-voltage family of small footprint, non-synchronous buck regulators. The ICs address the designer’s need for a dual regulator solution for 5 and 3.3V buses, as well as the need for smaller footprint and substantial cost savings. The chips target applications, where total solution cost is a critical design consideration, such as wired and wireless broadband communication equipments, HD set top boxes, computing peripherals and low power FPGAs. The dual channel regulators allow customers to address multiple-rail step-down requirements in a cost-effective manner. The devices feature fast operation and an internal compensation, which provide fast transient response. Each channel provides up to 2A of output current, while designers can realise more than 92% efficiency. The output voltage can be adjusted to 0.6V and these devices can operate with a maximum duty cycle of 100% for use in low dropout conditions.