Power Electronics

Power Controller Features Energy Management Unit

National Semiconductor’s second-generation, digitally programmable LP5552 PowerWise energy management unit (EMU) and advanced power controller (APC2) intellectual property (IP) package is designed for reducing power consumption in battery-powered handheld consumer products. The APC2 IP pairs with the LP5552 EMU to reduce the power consumption of high data-rate digital processors with frequency-scaling capability by up to 70%.

The APC2 IP is compatible with Intelligent Energy Manager (IEM) frequency-scaling technology from ARM. 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 LP5552 supports the PWI 2.0 interface, a 2-pin, high-speed serial power management control interface for advanced processor power management. To enable adaptive voltage scaling, the LP5552 includes two digitally programmable, 600 mA, 0.6-V to 1.2-V buck regulators with up to 90% efficiency and excellent transient performance for rapidly varying digital loads. In addition, it has five programmable low dropout (LDO) regulators with output voltages ranging from 0.6 V to 3.3 V.

The linear regulators support output current ranges from 50 mA to 250 mA. Two of the linear regulators contain a low quiescent (lq) current-retention mode for minimizing system power consumption when SoC processors are inactive, but need fast recovery time.

Available in a lead-free, 36-bump micro SMD package, the LP5552 has excellent package thermal characteristics and operates over the full temperature range from –40°C to +85°C, with input voltages from 2.7 V to 4.8 V. The LP5552 is available now and is priced at $5.50 in 1000-unit quantities. Samples are also available. The APC2 is available for licensing from National and ARM.

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