Santa Clara, Calif.—National Semiconductor's LP5552 energy management unit and APC2 advanced power controller, second-generation PowerWise components, provide extended functionality to extend battery life. The combination, according to the company, can reduce power consumption in existing high data-rate processors by up to 70 percent.
The LP5552, working from a 2.7 to 4.8-volt input, includes two adaptive 600-mA, 0.6- 1.2V buck regulators that enable the processor to scale its supply voltages to the minimum level required, and five programmable regulators. The chip's linear regulators (50 to 250 mA at 0.6 to 3.3 volts), power the input/output (I/O) ring, oscillator and phase-locked loops (PLL) and embedded and external memories on low-power SoCs, and can also power other auxiliary devices in the system. The PWI 2.0 interface controls the LP5552's functions for simple interfacing to the digital processor.
Compliant with the AMBA specification, the APC2 is a synthesizable macrocell that includes a hardware performance monitor to support adaptive voltage and frequency scaling. Similar to the APC1 announced by National Semiconductor in 2004, the APC2 automatically calibrates for process and temperature variations, and communicates with the LP5552 using the PWI 2.0 interface. In addition, the APC2 concurrently manages multiple voltages and frequency-scaled power domains on a multi-processor SoC, as well as bias voltages for leakage reduction with threshold scaling. The APC2 is provided as configurable soft intellectual property with RTL, configuration and synthesis scripts, test benches, implementation, and programming documentation, as well as reference driver software. The IP package is compatible with industry-standard design tools and flows. The APC2 supports up to four power domains each with up to four independently frequency-scaled clock domains inside. It also supports eight frequency settings, clock-stop and power-down modes for each clock domain.
Click here for more information on the LP5552 and to order samples. The LP5552, in a 36-bump micro SMD package, is priced at $5.50 in 1,000-unit quantities. The APC2 is available for licensing from National and ARM Ltd.
The LP5552 and APC2 are compliant with the PowerWise Interface (PWI) 2.0 open-industry standard introduced by National Semiconductor and ARM earlier this year. The APC2 IP is compatible with Intelligent Energy Manager (IEM) frequency-scaling technology from ARM Ltd. For more information about the PWI 2.0 adaptive voltage scaling technology, click here. For more information about the PowerWise Interface, click here. Click here for the on-line seminar, "PowerWise Adaptive Voltage Scaling Technology."
National Semiconductor, 1-800-272-9959, www.national.com