National Semiconductor launches two highly integrated power management chips using dynamic voltage regulation technology

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National Semiconductor launches two highly integrated power management chips using dynamic voltage regulation technology [Copy link]

National Semiconductor has introduced two new products in its family of digitally programmable multi-output power management chips, one of which is a highly flexible power management unit and the other is a highly integrated DC/DC converter. The LP3971 power management unit and the LM3370 dual-channel step-down DC/DC converter both feature a digital I2C-compatible interface, allowing design engineers to set the technical parameters of consumer electronics products, such as output voltage and switching mode, to suit their needs. The advantage of the digital interface is that it is highly flexible, allowing solutions with different output voltages to use the same chip and significantly saving power in consumer electronics products.

　　The flexible and highly integrated LP3971 power management unit and LM3370 DC/DC converter both have built-in buck regulators, which guarantee efficiency of more than 90% as long as they operate within the specified load current range. System designers can further reduce power consumption by using dynamic voltage regulation technology, which allows the power supply system to adjust the output voltage according to the processor's workload and clock frequency. For systems that attach great importance to energy saving, such as mobile phones and personal media players, these two chips can extend their battery life.

　　"National's newest power management chips are digitally programmable and highly efficient, making them ideal for the Intel XScale microarchitecture," said Mark Casey, general manager of Intel's Application Processor Business Unit. "They also support the advanced power management modes in our new Monahans family of application processors, allowing a new generation of multimedia electronics to stay powered on or perform services longer, such as ensuring that users can talk longer."

　　The LP3971 chip with flexible design can provide a fully integrated power management solution for the new generation of multimedia processors. In addition to the digital setting function, this chip has many extremely easy-to-use functions. This is the most ideal power management solution for digital systems in multiple fields. Since the LM3370 dual-channel buck DC/DC converter has the function of independent setting, it can be used in conjunction with the LP3971 power management unit with flexible design. In addition, the two digitally controlled buck regulators built into the LM3370 chip can also be used together with National Semiconductor's LP3990 and LP5900 linear regulators to form another highly flexible power system that can meet customers' special requirements.

　　"Chip makers like Intel are working hard to reduce the power consumption of their processors, and National is also actively working to save energy," said Gianluca Colli, business director of National Semiconductor's power management products division. "For example, we are constantly improving the conversion efficiency of power management chips and adding advanced power management features to our products."

　　Technical features of National Semiconductor's LP3971 power management unit

　　The LP3971 power management unit has three high-efficiency 1600mA programmable step-down converters and six programmable low-dropout regulators built in, so it can meet the stringent power supply requirements of microcontroller systems such as Intel XScale processors. The LP3971 chip uses a small 40-pin LLP&Reg package that measures only 5mm x 5mm x 0.8mm.

　　The LP3971 chip is suitable for input voltages between 2.7V and 5.5V. The built-in buck regulator can provide an output voltage of 0.8V to 3.3V, while the low-dropout regulator can provide an output voltage of 1V to 3.3V. Since the power conversion efficiency of the low-dropout regulator is no different from that of the switching regulator, and its input voltage is lower and the input/output voltage drop is also smaller, the two low-dropout regulators can be used as post-regulators.

　　Because the output voltage range of this LP3971 chip is relatively wide, it is suitable for a variety of different application processors and can meet the needs of different applications. Design engineers only need to use the evaluation kit of the LP3971 chip to set the parameters of each regulator through the I2C compatible interface and its software control function. This LP3971 chip also has other functions, including a backup battery charger, a power reset function to protect the processor from input voltage fluctuations, and a control function that ensures that the processor can control the start-up and switching of the regulator through the I2C compatible interface.

　　Technical features of National Semiconductor's LM3370 DC/DC converter

　　The LM3370 DC/DC converter uses an extremely small 16-pin LLP package, which is only 4mm x 5mm x 0.8mm in size, but each channel can provide 600mA of load current and is extremely efficient. There is a special reason for such high efficiency. It turns out that this converter uses advanced intelligent technology to automatically switch between pulse width modulation (PWM) and pulse frequency modulation (PFM) modes according to operational needs. Taking PFM mode as an example, the quiescent current of each channel is only 16uA, which is the lowest level in the industry, helping to further extend the battery life of portable electronic products. As for the output voltage range, the first output voltage is between 1V and 2V, and the second output voltage is between 1.8V and 3.3V. Both output voltages can be adjusted through the I2C interface and can be increased or decreased in steps of 50mV and 100mV respectively. In addition, the LM3370 chip has other features such as a power-on reset function that protects the processor from voltage fluctuations, and an independently controlled startup function that ensures that the system can be easily and effectively sequenced for power.

　　National Semiconductor's power management products

　　According to iSuppli's 2005 voltage regulator/voltage reference circuit market survey, National Semiconductor is the world's largest supplier of power management integrated circuits, with a market share of 14.1%. In 2004, National Semiconductor's power management product sales increased by 37.3% over the previous year, far higher than the industry average of 24%. National Semiconductor has a wide range of innovative power management products, including industry-leading linear regulators, power monitoring, control and voltage reference integrated circuits, and various switching converters, such as high-voltage DC/DC conversion integrated circuits, switched capacitor converters, light management integrated circuits and inductive switching converters. National Semiconductor also provides system design engineers with a variety of different online design tools, allowing engineers to select the best power management chip for their system design. System design engineers can also log in to National Semiconductor's WEBENCHò design website to purchase products, then conceive and analyze system designs online, and then use customized kits for modeling, and the kits are guaranteed to be delivered to customers in the shortest possible time.

　　Both the LP3971 and LM3370 are available in quantities of 1,000. The LP3971 is priced at $4.00 and the LM3370 is priced at $2.10. Both products are available in large quantities from stock.

　　About National Semiconductor

　　National Semiconductor is a well-known analog technology supplier and has been committed to developing analog chips and subsystems with high value-added capabilities. The company's advanced products include power management circuits, display drivers, audio and operational amplifiers, communication interface products and data conversion solutions. National Semiconductor's analog chip products are mainly aimed at mobile phones, displays and a wide range of electronic product markets, including medical equipment, automotive electronic systems, industrial systems, and test and measurement equipment. National Semiconductor's headquarters is located in Santa Clara, California, USA, and its turnover in the 2005 fiscal year ending May 29, 2005 reached US$1.91 billion.

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