National Semiconductor Introduces Family of Dual-Rail Linear Regulators That Offers Industry's Lowest Dropout

New Products Enable Efficient Power Conversion from 1.8 V to 1.5 V and 1.2 V For Notebook and Set-Top Box Applications

SANTA CLARA, Calif., April 14 /PRNewswire-FirstCall/ -- Continuing its power management innovations, National Semiconductor today announced the addition of two CMOS dual input low dropout (LDO) voltage regulators that offer the industry's lowest dropout. Optimized for low-voltage, high current applications in PCs and set-top boxes, this new family of LDOs enables high efficiency linear conversion while consuming ultra-low quiescent current of only 3 mA under all conditions.

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In contrast, the quiescent current of bipolar alternatives increases to over 100 mA as the regulator approaches dropout.

"The ultra-low dropout of 160 mV and ultra-low quiescent current make National's LP3881 the industry's most power efficient LDO in applications generating a regulated 1.5 V output from a 1.8 V input," said Paul Greenland, marketing director of National Semiconductor's Power Management Group. "With the LP388x family, designers now have a linear alternative to complex, noisy switching regulators when generating output voltages down to 1.2 V."

The LP388x family now includes the two new devices, the LP3881 and LP3882, and the recently released LP3883, providing a significant power savings to customers. This family uses a separate input to power the control circuitry; the power input may be fed independently from the high current supply facilitating conversion from input rails of less than 2.5 V. The CMOS dual input architecture allows for an ultra low input voltage and low output voltages down to 1.2 V. The dropout voltage for the LP3883/2/1 is typically 210 mV/110 mV/75 mV at 3 A/1.5 A/0.8 A and a maximum of 420 mV/270 mV/160 mV over temperature, the best in the industry.

The LP388x family's unique circuit approach enables delivery of custom voltages in 50 mV increments in the range of 1.25 V to 1.8 V. The LP388x family has an output voltage accuracy of +/-3 percent over line, load and temperature variations and features on/off control, over-temperature and over-current protection.

Availability, Pricing and Packaging

National Semiconductor's LP388x family of high current, low voltage CMOS LDOs is shipping today in TO220-5 lead and TO263-5 lead packages. In 1,000-unit quantities, the LP3881 is priced at $2.08 each, the LP3882 is priced at $2.18 each and the LP3883 is priced at $2.68 each.

About National Semiconductor

National Semiconductor is the premier analog company driving the information age. Combining real-world analog and state-of-the-art digital technology, the company is focused on analog-based semiconductor products, which include stand-alone devices and subsystems in the areas of power management, imaging, display drivers, audio, amplifiers and data conversion. The company targets key markets such as wireless, displays, information infrastructure and a broad range of portable applications. With headquarters in Santa Clara, California, National reported sales of $1.5 billion for its most recent fiscal year. Additional company and product information is available on the World Wide Web at

NOTE: National Semiconductor is a registered trademark of National Semiconductor Corporation. All other brands or product names are trademarks or registered trademarks of their respective holders.

CONTACT: Media, Mike He of National Semiconductor Corporation,
+1-408-721-5222, or Email Contact

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