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2.5MHz Boost/Inverter DC/DC Converter with 2A/42V Switch & Synchronization

Oct 4 2007 - MILPITAS, CA
  • MILPITAS, CA - October 4, 2007 - Linear Technology Corporation announces the LT3580, a current mode, fixed frequency step-up DC/DC converter with an internal 2A, 42V switch. It operates from an input voltage range of 2.5V to 32V, making it suitable for applications with input sources ranging from a single-cell Li-Ion to automotive inputs. The LT3580 can be configured as either a boost, SEPIC or an inverting converter. Its switching frequency can be programmed, via a single resistor or synchronized to an external clock, between 200kHz and 2.5MHz, enabling designers to minimize external component sizes and to avoid "noise critical" frequency bands. The combination of a 3mm x 3mm DFN package (or MSOP-8E) and tiny externals ensures a very compact footprint while minimizing solution cost.


    The LT3580's low VCESAT switch, 0.3V at 1.5A, delivers efficiencies of up to 89%. Under-voltage lockout (UVLO) is user adjustable for optimal system performance. A single feedback resistor sets the output voltage, minimizing external components. Other features include external synchronization capability, internal soft-start and thermal shutdown protection.


    The LT3580EDD is available in a 3mm x 3mm DFN-8 package. Pricing starts at $2.00 each for 1,000 piece quantities. The LT3580MS8E is also available in a thermally enhanced MSOP-8 package. Pricing starts at $2.10 each for 1,000 piece quantities. Industrial temperature (-40°C to 125°C) versions, the LT3580IDD and the LT3580IMS8E, are also available from stock. Pricing starts at $2.40 and $2.52 each, respectively, for 1,000 piece quantities.


     
    Summary of Features: LT3580
    •  2A Internal Power Switch
    •  Adjustable Switching Frequency
    •  Single Feedback Resistor Sets VOUT
    •  Synchronizable to External Clock from 200kHz to 2.5MHz
    •  High Gain SHDN Pin Accepts Slowly Varying Input Signals
    •  Wide Input Voltage Range: 2.5V to 32V
    •  Low VCESAT Switch: 300mV at 1.5A (Typical)
    •  Integrated Soft-Start Function
    • 

    Easily Configurable as a Boost or Inverting Converter


    •  User Configurable Undervoltage Lockout (UVLO)
    •  Tiny 8-Lead 3mm × 3mm DFN and 8-Lead MSOP Packages
     

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