2.2MHz Wide Input Nonsynchronous Boost,SEPIC,Flyback Controller with Spread Spectrum


Product details


Vin (Min) (V) 1.5 Vin (Max) (V) 60 Vout (Min) (V) 1.5 Vout (Max) (V) 300 Regulated outputs (#) 1 Switching frequency (Min) (kHz) 100 Switching frequency (Max) (kHz) 500 Iq (Typ) (mA) 0.49 Features Adjustable Current Limit, Enable, Frequency Synchronization, Light Load Efficiency, Power Good, UVLO Adjustable Duty cycle (Max) (%) 93 TI functional safety category Functional Safety-Capable Rating Automotive Operating temperature range (C) -40 to 125 open-in-new Find other Boost controllers (external switch)

Package | Pins | Size

WSON (DSS) 12 6 mm² 3 x 2 open-in-new Find other Boost controllers (external switch)


  • Functional Safety-Capable
  • Suited for wide input operating range battery applications
    • 3.5-V to 60-V operating range (65-V abs max)
    • 2.97-V to 16-V when BIAS = VCC
    • Minimum boost supply voltage 1.5 V when BIAS ≥ 3.5 V
    • Input transient protection up to 65 V
    • Minimized battery drain
      • Low shutdown current (IQ ≤ 2.6 µA)
      • Low operating current (IQ ≤ 490 µA)
  • Small solution size and low cost
    • Maximum switching frequency of 2.2 MHz
    • 12-Pin WSON package (3 mm × 2 mm)
    • Integrated error amplifier allows primary-side regulation without optocoupler (flyback)
  • EMI mitigation
    • Selectable dual random spread spectrum
    • Lead-less package
  • Higher efficiency with low-power dissipation
    • 100-mV ±7% accurate current limit threshold
    • Strong 1.5-A peak standard MOSFET driver
    • Supports external VCC supply
  • Avoid AM band interference and crosstalk
    • Optional clock synchronization
    • Dynamically programmable switching frequency from 100 kHz to 2.2 MHz
  • Integrated protection features
    • Constant peak current limiting over input voltage
    • Optional hiccup mode overload protection (see the Device Comparison Table)
    • Programmable line UVLO
    • OVP protection
    • Thermal shutdown
  • ±1% accuracy feedback reference
  • Supports additional slope compensation
  • Programmable soft start
  • PGOOD indicator
  • Create a custom design using the LM5156x with the WEBENCH power designer
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The LM5156x (LM5156 and LM51561) device is a wide input range, non-synchronous boost controller that uses peak current mode control. The device can be used in boost, SEPIC, and flyback topologies.

The LM5156x device can start up from a 1-cell battery with a minimum of 2.97 V if the BIAS pin is connected to the VCC pin. It can operate with the input supply voltage as low as 1.5 V if the BIAS pin is greater than 3.5 V.

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Same functionality with different pin-out to the compared device.
NEW LM51561H ACTIVE 2.2-MHz wide VIN nonsynchronous boost, flyback, & SEPIC controller with spread spectrum and hiccup Functionally equivalent device in a HTSSOP package

Technical documentation

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Type Title Date
* Data sheet LM5156x 2.2-MHz Wide VIN 65-V Non-synchronous Boost/SEPIC/Flyback Controller with Dual Random Spread Spectrum datasheet Jan. 28, 2021
Functional safety information LM34966-Q1, LM5156x-Q1 Functional Safety, FIT Rate, Failure Mode Distribution (Rev. C) Apr. 28, 2021
Technical article Lowering audible noise in automotive applications with TI’s DRSS technology Mar. 18, 2021
User guide LM5156EVM-BST User's Guide (Rev. A) Jun. 22, 2020
Application note EMI Reduction Technique, Dual Random Spread Spectrum Jun. 19, 2020
Application note How to Design a Boost Converter Using the LM5156 Jun. 18, 2020
Application note How to design an isolated flyback using LM5155 Feb. 05, 2019
Technical article How to add overvoltage protection to a synchronous boost controller Sep. 17, 2018

Design & development

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

Hardware development

document-generic User guide

The LM5156EVM-BST evaluation module showcases the features and performance of the LM5156-Q1 wide-input voltage non-synchronous boost controller. The standard configuration is designed to provide a regulated output of 12 V at 3 A from an input of 3 V to 12 V, switching at 440 kHz.

This EVM is designed (...)

  • Input voltage range: 3 V to 12 V
  • Output voltage: 12 V at 3 A with 1% accurate reference voltage
  • Efficiency > 95% at full load
  • 440-kHz switching frequency
  • External clock synchronization option
  • Internal spread spectrum operation

Design tools & simulation

SNVMBV9F.ZIP (204 KB) - PSpice Model
SNVMC69.ZIP (42 KB) - PSpice Model
PSpice® for TI design and simulation tool
PSPICE-FOR-TI — PSpice® for TI is a design and simulation environment that helps evaluate functionality of analog circuits. This full-featured, design and simulation suite uses an analog analysis engine from Cadence®. Available at no cost, PSpice for TI includes one of the largest model libraries in the (...)
  • 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
  • (...)
SNVC224A.ZIP (3484 KB)
SNVC240.ZIP (5304 KB)
SNVR481.ZIP (1265 KB)

CAD/CAE symbols

Package Pins Download
WSON (DSS) 12 View options

Ordering & quality

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  • Lead finish/Ball material
  • MSL rating/Peak reflow
  • MTBF/FIT estimates
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  • Qualification summary
  • Ongoing reliability monitoring

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