Energy Management Unit
National Semiconductor Corporation announces a digitally-controlled PowerWise energy management unit (EMU), a highly integrated circuit that reduces the power consumption of digital processors used in battery-powered handheld consumer products. The LP5550 EMU, used in conjunction with the company’s advanced power controller (APC) and intelligent energy manager (IEM) technology from ARM Ltd., reduces the power consumption of digital processor cores by up to 70%. The LP5550 enables a digital processor to adaptively adjust its supply voltage to the minimum level needed. The device includes an adaptive-supply-voltage buck regulator for the processor core and three additional fixed-voltage regulators. The fixed-voltage regulators power the input/output ring, oscillator/phase-locked loops (PLL) and memory on a low-power system-on-chip (SoC). The PWI interface controls the LP5550's functions for simple interfacing to the digital processor. The LP5550 supports the PWI interface, a 2-pin, high-speed serial power management control interface for advanced processor power management.
National Semiconductor Corporation