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National Semiconductor Introduces High-Voltage Single-Ended Converter for High Efficiency Current-Mode Power Supplies

New Power Product Provides Efficient DC-DC Solution for PoE Applications

Feb 23, 2004

February 23, 2004 - Expanding its power management portfolio, National Semiconductor Corporation (NYSE:NSM) announced today a new high-voltage, single-ended converter that contains all the functions required to implement control, drive and regulation in flyback and forward power supplies. 

Packaged in a tiny (4 mm x 4 mm), thermally enhanced chip-scale package, this device integrates a 100 V start-up bias regulator, a current-mode PWM controller, 1 A power MOSFET driver and precision high-frequency control circuitry, making it a compact and efficient solution for many Power-over-Ethernet (PoE) powered device (PD) applications.  It is also an ideal bias supply controller for 42 V automotive, 36 V industrial power bus and high-availability distributed power systems in 48 V communications equipment such as central office switches, routers and DSL access multiplexers.

“National Semiconductor’s new LM5020 is yet another example of our commitment to providing optimized, high-voltage power management products to our most demanding customers,” said Paul Greenland, marketing director of the power management group, National Semiconductor.  “The first combination of our 100 V ABCD150XV (analog bipolar CMOS DMOS) process technology, small footprint and the integrated 100 V start-up bias regulator provides the optimal solution for its targeted applications.”

National’s LM5020 is offered as a high-voltage (up to 100 V) single-ended converter controller that will complement the recently launched LM5030 push-pull controller. 

The high-speed LM5020 controller provides total propagation delays less than 100ns and a 1 MHz-capable oscillator that is programmed with a single resistor.  The level of integration and innovative technology in National’s LM5020 differentiates it from competitors’ products:

  • Wide-range, 15 V-to-100 V, start-up bias regulator         
  • High-speed, 1 A peak power MOSFET driver         
  • User-programmable line under-voltage lockout (UVLO) with hysteresis         
  • Tiny, 10-pin MSOP or 10-pin thermally enhanced LLP® chip-scale package

Additional features of the LM5020 include error amplifier, precision reference, cycle-by-cycle current limit, internal slope compensation, programmable soft-start, oscillator synchronization capability and thermal shutdown.  Customers will benefit from reduced component count, high-speed performance, elimination of the external start-up regulator, power on sequencing, minimized start-up surge currents and the capability to synchronize the oscillator while eliminating interference.

Shipping now, the LM5020 is housed in either a MSOP-10 or a LLP chip-scale package.  It is priced at $0.75 each in 1,000-unit quantities. 

About National Semiconductor
National Semiconductor, the industry's premier analog company, creates high performance analog devices and subsystems. National's leading-edge products include power management circuits, display drivers, audio and operational amplifiers, imaging sensors and data conversion solutions. National's key markets include wireless handsets, displays, PCs, networks and a broad range of portable applications. With headquarters in Santa Clara, California, National reported sales of $1.67 billion for fiscal 2003, which ended May 25, 2003. Additional company and product information is available at www.national.com