Low-Dropout Regulators power DSPs, FPGAs, and ASICs.

Press Release Summary:

Series LP385x CMOS LDO regulators feature output currents of 1.5 and 3.0 A, logic-controlled on/off, error flag or separate sense pin, over-temperature, and over-current protection. Typical dropout voltage is 240 mV at 1.5 A and 390 mV at 3.0 A load, allowing designers to generate high-eeficiency 2.5 V output from 3.3 V supply up to 2.5 A. Output-voltage accuracy is ±1.5% at room temperature over load and line variations.

Original Press Release:

National Semiconductor Introduces New CMOS High Current Family of Ultra LDO Regulators Ideal for Powering DSP, FPGA and ASICs

April 29, 2003 - Enabling innovative power supply designs, National Semiconductor (NYSE: NSM) today announced a new family of low-noise, high-performance CMOS low dropout (LDO) regulators for low voltage, high current DSP, FPGA and ASIC applications. The new products provide customers with design flexibility, ease-of-use and competitive advantages, extending National's leadership in power management.

The new LP385x family, comprised of the LP3852, LP3853, LP3855 and LP3856, features output currents of 1.5 A or 3.0 A, logic-controlled ON/OFF, an error flag or a separate sense pin, over-temperature and over-current protection. The typical dropout voltage for the regulators is a low 240 mV at 1.5 A, and 390 mV at 3.0 A load.

The family's ultra-low dropout voltage allows designers to generate a high efficiency 2.5 V output from a 3.3 V supply up to 2.5 A. Moreover, a power supply rejection ratio (PSRR) of 73 db on the LP385x family offers enhanced power supply ripple rejection with low input and output filter capacitance.

For the LP385x family, the output voltage accuracy is ± 1.5 percent at room temperature over load and line variations and is guaranteed to be ±3 percent over all conditions. In applications where the load is remote from the regulator, the separate output sense pin allows sensing at the load, compensating for PCB trace resistance. When energy efficiency is paramount, the 10 nA quiescent current in shutdown mode facilitates sleep or STANDBY operation. Sixteen voltage options and an adjustable version are possible for each product.

Availability, Pricing and Packaging

National Semiconductor's LP385x family of high current, low voltage CMOS LDOs is shipping today in both TO-263 and TO-220 packages. In 1,000-unit quantities, the LP3852/LP3855 is priced at $1.64 each; the LP3853/LP3856 is priced at $2.58 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 www.national.com.

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

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