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National Semiconductor Introduces High-Voltage Positive Hot Swap Controller For Networking and Industrial Systems

LM5069, in MSOP Package, Utilizes Current Limiting, Power Limiting and Over-Voltage Protection to Provide Intelligent Control of the Power Supply

Oct 25, 2006

October 25, 2006 -- National Semiconductor Corporation (NYSE: NSM) today introduced the LM5069, a positive hot swap controller with power limiting for use as in-rush current protection and as a solid-state circuit breaker in server backplane, base station power distribution and 12V, 24V and 48V industrial systems.

The LM5069 controller, packaged in a 10-pin MSOP package, provides intelligent control of the power supply connections during insertion and removal of circuit cards from a live system backplane or other "hot" power source.  The LM5069 provides in-rush current control to limit system voltage droop and transients.  The current limit and power dissipation in the external series pass N-Channel MOSFET are programmable, ensuring operation with the device’s Safe Operating Area (SOA).  The POWER GOOD output indicates when the output voltage is within 1.25V of the input voltage.  The input under-voltage and over-voltage lockout levels and hysteresis are programmable, as well as the initial insertion delay time and fault detection time.

Key Features of the LM5069:

  • Wide operating range of 9V to 80V 
  • Transient input capability to 100V 
  • Programmable control of power dissipation in external MOSFET 
  • Circuit breaker function for severe over-current events 
  • Internal high-side charge pump and gate driver for external N-channel MOSFET 
  • Initial insertion timer allows ringing and transients to subside after system connection 
  • Programmable fault timer prevents false triggering from momentary load transients 
  • Available in latched fault and automatic restart versions

About National’s Power Management Products
National Semiconductor is the number one supplier of voltage regulator ICs with 14 percent market share, according to iSuppli’s 2005 Semiconductor Market Share survey.  National's innovative power management products include best-in-class linear regulators; power monitoring, control and reference ICs; and switching converters, such as high-voltage ICs for DC-DC conversion, switched capacitor converters, lighting management ICs and inductive switching converters.  National also offers online tools that enable power designers to select the best power management chips for their applications.  National's Webench® design tool allows designers to choose a product, create and analyze a design, and then build custom prototypes that can be delivered within 24 hours. More information about National’s power management products is available at

Pricing and Availability
The LM5069 is priced at $1.60 in 1,000-unit quantities.  For more information about the LM5069, including how to order evaluation boards and samples, please visit http://www.national.com/pf/LM/LM5069.html

About National Semiconductor
National Semiconductor, the industry's premier analog company, creates high-value analog devices and subsystems.  National's leading-edge products include power management circuits, display drivers, audio and operational amplifiers, interface products and data conversion solutions. National's key analog markets include wireless handsets, displays and a variety of broad electronics markets, including medical, automotive, industrial, and test and measurement applications. Headquartered in Santa Clara, Calif., National reported sales of $2.16 billion for fiscal 2006, which ended May 28, 2006.  Additional company and product information is available at www.national.com