42V Synchronous Step-Down Controller with 3.3V Output and Adjustable Switching Frequency


Product details


Vin (Min) (V) 6 Vin (Max) (V) 42 Vout (Min) (V) 3.3 Vout (Max) (V) 3.3 Iout (Max) (A) 12 Iq (Typ) (uA) 3600 Switching frequency (Min) (kHz) 250 Switching frequency (Max) (kHz) 250 Features Enable, Synchronous Rectification, Tracking Operating temperature range (C) -40 to 125 Regulated outputs (#) 1 Number of phases 1 Rating Catalog open-in-new Find other Buck controllers (external switch)

Package | Pins | Size

HTSSOP (PWP) 14 32 mm² 5 x 6.4 open-in-new Find other Buck controllers (external switch)


  • PowerWise ® step-down controller
  • 6V to 42V Wide input voltage range
  • Fixed output voltage of 3.3V
  • Fixed switching frequencies of 250 kHz/500 kHz/750 kHz
  • No loop compensation required
  • Fully WEBENCH ® enabled
  • Low external component count
  • Constant On-Time control
  • Ultra-Fast transient response
  • Stable with low ESR capacitors
  • Output voltage pre-bias startup
  • Valley current limit
  • Programmable soft-start

  • Typical Applications

  • Telecom
  • Networking Equipment
  • Routers
  • Security Surveillance
  • Power Modules

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    The LM3151/2/3 SIMPLE SWITCHER ® Controller is an easy to use and simplified step down power controller capable of providing up to 12A of output current in a typical application. Operating with an input voltage range from 6V-42V, the LM3151/2/3 features a fixed output voltage of 3.3V, and features switching frequencies of 250 kHz, 500 kHz, and 750 kHz. The synchronous architecture provides for highly efficient designs. The LM3151/2/3 controller employs a Constant On-Time (COT) architecture with a proprietary Emulated Ripple Mode (ERM) control that allows for the use of low ESR output capacitors, which reduces overall solution size and output voltage ripple. The Constant On-Time (COT) regulation architecture allows for fast transient response and requires no loop compensation, which reduces external component count and reduces design complexity.

    Fault protection features such as thermal shutdown, under-voltage lockout, over-voltage protection, short-circuit protection, current limit, and output voltage pre-bias startup allow for a reliable and robust solution.

    The LM3151/2/3 SIMPLE SWITCHER ® concept provides for an easy to use complete design using a minimum number of external components and National’s WEBENCH ® online design tool. WEBENCH ® provides design support for every step of the design process and includes features such as external component calculation with a new MOSFET selector, electrical simulation, thermal simulation, and Build-It boards for prototyping.

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    Technical documentation

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    Type Title Date
    * Data sheet LM3151/52/53 SIMPLE SWITCHER CONTROLLER, High Input Voltage Sync Step-Down datasheet (Rev. G) Mar. 04, 2011
    Selection guide Power Management Guide 2018 (Rev. R) Jun. 25, 2018
    User guide AN-1900 LM3150 Evaluation Boards (Rev. D) May 01, 2013
    Application note AN-1229 SIMPLE SWITCHER PCB Layout Guidelines (Rev. C) Apr. 23, 2013
    Application note Controlling Output Ripple & Achiev ESR Indep Constant On-Time Reg Designs (Rev. A) Apr. 23, 2013
    User guide SIMPLE SWITCHER® Design Guide Apr. 11, 2011

    Design & development

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    Hardware development

    document-generic User guide

    The LM3152-3.3 demonstration board is a part of the PowerWise® family of SIMPLE SWITCHER® Controllers. It has been designed to balance solution size and performance. The Constant-On-Time (COT) Emulated Ripple Mode (ERM) Control allows for the use of low ESR output capacitors and therefore (...)

    • Easy To Use with Webench and Offline Design Tools
    • No Loop Compensation Required
    • Low Solution Component Count
    • Ultra-Fast Transient Response
    • Low Output Voltage Ripple (32mVpp)
    • 3.3V Fixed Output Voltage
    • Optimized for 10A Average Load Current
    • 95% Peak Efficiency
    • Constant-On-Time with Emulated Ripple Mode (...)

    Design tools & simulation

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    • Leverages Cadence PSpice Technology
    • Preinstalled library with a suite of digital models to enable worst-case timing analysis
    • Dynamic updates ensure you have access to most current device models
    • Optimized for simulation speed without loss of accuracy
    • Supports simultaneous analysis of multiple products
    • (...)

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