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Product details

Parameters

Vin (Min) (V) 3.1 Vin (Max) (V) 40 Vout (Min) (V) 1.259 Vout (Max) (V) 75 Switch current limit (Typ) (A) 2 Regulated outputs (#) 1 Switching frequency (Min) (kHz) 300 Switching frequency (Max) (kHz) 1300 Iq (Typ) (mA) 2.1 Features Enable Duty cycle (Max) (%) 90 Operating temperature range (C) -40 to 125 Type Converter Rating Catalog open-in-new Find other Boost converters (integrated switch)

Package | Pins | Size

TSSOP (PW) 16 22 mm² 5 x 4.4 WSON (NHQ) 16 25 mm² 5 x 5 open-in-new Find other Boost converters (integrated switch)

Features

  • 80V internal switch
  • Operating input voltage range of 3.1V to 40V
  • Pin selectable operating frequency
       300kHz/700kHz (-3)
       600kHz/1.3MHz (-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

  • open-in-new Find other Boost converters (integrated switch)

    Description

    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 1.3MHz (FS Open). The device is available in a low profile 16-lead TSSOP package or a thermally enhanced 16-lead LLP package.


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    Technical documentation

    Design & development

    For additional terms or required resources, click any title below to view the detail page where available.

    Hardware development

    EVALUATION BOARDS Download
    document-generic User guide
    $49.00
    Features

    Features:

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

    Design tools & simulation

    CALCULATION TOOLS Download
    Fly-Buck and Flyback Topology Selector
    FLYBUCK-FLYBACK-DESIGN-CALC This tool helps a power supply engineer to select the right isolated DC-DC topology based on the specifications. Depending on the topology chosen, the calculator also recommends the right IC for the design.
    Features
    • Features isolated topologies like Fly-Buck™, Fly-Buck-Boost, DCM and CCM Flyback
    • Capability to design up to 6 isolated outputs
    • Recommends ICs for desired application design
    • Incorporates loop compensation in designs
    • Compares efficiency, external component count and transformer currents for every topology (...)
    CALCULATION TOOLS Download
    LM5000 Mathcad Design Tools
    LM5000MATHCAD-CALC
    CALCULATION TOOLS Download
    SNVU077.ZIP (2559 KB)

    Reference designs

    REFERENCE DESIGNS Download
    Dual Polarity Output Isolated Flyback (12Vout@-.25A)
    PMP7900 — This is an isolated flyback converter with input voltage range of 12V to 24Vin and dual polarity outputs (+/-12Vout) at 0.25A each (total of 0.5Aout).
    Design files
    REFERENCE DESIGNS Download
    Isolated Flyback Converter for Industrial Bias Supply - Reference Design
    PMP7932 PMP7932 is an isolated flyback converter which accepts an input voltage of 12Vin to 24Vin and provides dual polarity ouputs of +12Vout @ 0.25A and -12V @ 0.25A.
    document-generic Schematic document-generic User guide
    REFERENCE DESIGNS Download
    4.5Vin to 5.5Vin; 4Vout @ 0.7A; Flyback
    PMP7964 — A Flyback design accepting an input voltage of 4.5Vin to 5.5Vin and providing an isolated output of 4Vout that can deliver 0.7A.
    Design files
    REFERENCE DESIGNS Download
    Boost LED Driver with 12V AC and driving 6LEDS at 320mA
    PMP7754 — This design uses a 12Vac input which is rectified and fed to a boost DC to DC Converter with constant current feedback loop for driving 6 series LEDs at 0.32A. Also implemented is a simple circuit to decode a dimming signal from a TRIAC. This dimming decoder circuit controls the dimming level of the (...)

    CAD/CAE symbols

    Package Pins Download
    TSSOP (PW) 16 View options
    WSON (NHQ) 16 View options

    Ordering & quality

    Support & training

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    Videos

    Power Tips: Layout for a Boost Power Stage

    This video shows a simplified schematic and PCB layout for a boost converter

    Posted: 21-Jan-2016
    Duration: 04:31

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