LM5000  Product Folder

The LM5000 is a monolithic integrated circuit specifically designed and optimized for flyback, boost or forward power converter applications. The internal power switch is rated for a maximum of 80V, with a current limit set to 2A. Protecting the power switch are current limit and thermal shutdown circuits. The current mode control scheme provides excellent rejection of line transients and cycle-by-cycle current limiting. An external compensation pin and the built-in slope compensation allow the user to optimize the frequency compensation. Other distinctive features include softstart to reduce stresses during start-up and an external shutdown pin for remote ON/OFF control. There are two operating frequency ranges available. The LM5000-3 is pin selectable for either 300kHz (FS Grounded) or 700kHz (FS Open). The LM5000-6 is pin selectable for either 600kHz (FS Grounded) or 1.25MHz (FS Open). The device is available in a low profile 16-lead TSSOP package (available now) or a thermally enhanced 16-lead LLP package (coming in Q3CY03).

• 80V internal switch
• Operating input voltage range of 3.1V to 40V
• Pin selectable operating frequency 300kHz/700kHz (-3) 600kHz/1.25MHz (-6)
• Adjustable output voltage
• External compensation
• Input undervoltage lockout
• Softstart
• Current limit
• Over temperature protection
• External shutdown
• Small 16-Lead TSSOP or 16-Lead LLP package

• Flyback Regulator
• Forward Regulator
• Boost Regulator
• DSL Modems
• Distributed Power Converters