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National Semiconductor Improves Power Supply Efficiency and Reliability with Industry’s First Dual 5 Amp Gate Drivers

Sep 8, 2003

September 8, 2003 - National Semiconductor Corporation (NYSE: NSM) today announced dual gate drivers that offer the industry’s highest peak output current and unique negative-to-positive output voltage swing.  Featuring ultra-fast switching speed (14 nanosecond rise and fall times with 25 nanosecond propagation delay), the dual 5 amp peak gate drivers are offered in three different versions (inverting, non-inverting, and complementary).  They are designed to drive large power MOSFETs and low threshold synchronous rectifiers found in communication infrastructure power supplies, motor controls and uninterruptible power supply (UPS) systems. 

National Semiconductor’s new LM5110 dual gate driver is the latest addition to their family of high-voltage power control integrated circuits designed to enable efficient and reliable DC-DC power supply solutions. 

“The LM5110 broadens our high-voltage power IC portfolio for the communications market,” said Paul Greenland, marketing director of National Semiconductor’s power management group.  “The LM5110’s MOSFET/bipolar compound output circuitry permits rail-to-rail swing and output current 3x to 4x higher than competitive CMOS dual gate drivers.  When combined with our LM5041 or LM5030 high-voltage pulse width modulation (PWM) controllers, the LM5110 provides a cost-effective, high-speed PWM and field effect transistor (FET) driver chipset solution for modern power converters with high-current, low-voltage outputs.”

The LM5110 is the industry’s first  MOSFET driver offering split-supply capability to pull the  gate below the source, so that low threshold MOSFETs are held in the OFF-state with design margin for drain to gate transients and threshold shift.  In conventional single-supply applications with positive-only gate drive, the input reference pin of the LM5110 is simply connected to power ground.   The driver operates over a wide supply voltage range from 3.5 V to 14 V and have an integrated line under-voltage lockout (UVLO) circuit for safe and predictable operation when powering up / down or during power line transients.

Integrating important new features onto the two unused pins of  industry standard dual drivers,  the LM5110 supplements the unique value of 5 A peak output currents with a shutdown pin and  negative output drive capability to reliably control power MOSFETs in any situation.  The LM5110’s dual drivers can also be connected in parallel for twice the output current, providing 10 A peak current for more demanding applications. 

Housed in a tiny, thermally enhanced 10-pin LLP® chip-scale package (4 mm x 4 mm), the LM5110 improves thermal performance and minimizes overall PCB space, which translates into improved reliability and cost savings.  The LM5110 is offered in three configurations: dual non-inverting (-1), dual inverting (-2) and one inverting and one non-inverting stage (-3).  Electrical specifications are guaranteed over the  industrial temperature range from –40 °C to +125 °C.

Available today, the LM5110 is offered in either an SOIC-8 package or a 10-pin surface mounted LLP chip-scale package.  It is priced at $0.65 each in 1,000 units.

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, PCs, networks and a broad range of portable applications. With headquarters in Santa Clara, California, National reported sales of $1.67 billion for its most recent fiscal year. Additional company and product information is available on the World Wide Web at www.national.com