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LM51561-Q1

ACTIVE

2.2-MHz wide VIN nonsynchronous boost, flyback, & SEPIC controller with spread spectrum and hiccup

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Data sheet

LM51561-Q1

ACTIVE
Data sheet Order now

Product details

Vin (min) (V) 1.5 Vin (max) (V) 60 Operating temperature range (°C) -40 to 150 Control mode current mode Topology Boost, Flyback, SEPIC Rating Automotive Vout (min) (V) 1.5 Vout (max) (V) 300 Features Adjustable current limit, Enable, Frequency synchronization, Hiccup mode protection, Improved max. duty cycle, Light Load Efficiency, Nonsynchronous rectification, Power good, Spread Spectrum, UVLO adjustable Iq (typ) (µA) 490 Duty cycle (max) (%) 93 TI functional safety category Functional Safety-Capable
Vin (min) (V) 1.5 Vin (max) (V) 60 Operating temperature range (°C) -40 to 150 Control mode current mode Topology Boost, Flyback, SEPIC Rating Automotive Vout (min) (V) 1.5 Vout (max) (V) 300 Features Adjustable current limit, Enable, Frequency synchronization, Hiccup mode protection, Improved max. duty cycle, Light Load Efficiency, Nonsynchronous rectification, Power good, Spread Spectrum, UVLO adjustable Iq (typ) (µA) 490 Duty cycle (max) (%) 93 TI functional safety category Functional Safety-Capable
WSON (DSS) 12 6 mm² 3 x 2
  • AEC-Q100 qualified for automotive applications
    • Temperature grade 1: –40°C to +125°C TA
  • Functional Safety-Capable
  • Suited for wide input operating range car 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) with wettable flanks
    • Integrated error amplifier allows primary-side regulation without optocoupler (flyback)
    • Minimized undershoot during cranking (start-stop application)
  • 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
  • Accurate ±1% accuracy feedback reference
  • Programmable extra slope compensation
  • Adjustable soft start
  • PGOOD indicator
  • Create a custom design using the LM5156x-Q1 with the WEBENCH power designer
  • AEC-Q100 qualified for automotive applications
    • Temperature grade 1: –40°C to +125°C TA
  • Functional Safety-Capable
  • Suited for wide input operating range car 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) with wettable flanks
    • Integrated error amplifier allows primary-side regulation without optocoupler (flyback)
    • Minimized undershoot during cranking (start-stop application)
  • 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
  • Accurate ±1% accuracy feedback reference
  • Programmable extra slope compensation
  • Adjustable soft start
  • PGOOD indicator
  • Create a custom design using the LM5156x-Q1 with the WEBENCH power designer

The LM5156x-Q1 (LM5156-Q1 and LM51561-Q1) 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-Q1 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.

The LM5156x-Q1 (LM5156-Q1 and LM51561-Q1) 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-Q1 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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LM5156-Q1 ACTIVE 2.2-MHz wide VIN nonsynchronous boost, flyback, & SEPIC controller with dual random spread spectrum Does not have hiccup mode

Technical documentation

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Type Title Date
* Data sheet LM5156x-Q1 2.2-MHz Wide VIN 65-V Non-synchronous Boost/SEPIC/Flyback Controller with Dual Random Spread Spectrum datasheet (Rev. B) PDF | HTML 05 Jan 2021
White paper Isolated Bias Power Supply Architecture for HEV and EV Traction Inverters PDF | HTML 11 Oct 2023
Application note How to Implement the Soft Start in a Flyback PDF | HTML 10 Jul 2023
Application note EMI 감소 기법, 듀얼 랜덤 확산 스펙트럼 (Rev. A) PDF | HTML 21 Nov 2022
Application note LM5156을 사용하여 부스트 컨버터를 설계하는 방법 (Rev. A) PDF | HTML 21 Nov 2022
Application note How to Design a Boost Converter Using the LM5156 (Rev. A) PDF | HTML 14 Nov 2022
Application note EMI Reduction Technique, Dual Random Spread Spectrum (Rev. A) 19 Oct 2022
Functional safety information LM34966-Q1, LM5156x-Q1 Functional Safety, FIT Rate, Failure Mode Distribution (Rev. C) PDF | HTML 28 Apr 2021
Technical article Lowering audible noise in automotive applications with TI’s DRSS technology PDF | HTML 18 Mar 2021

Design & development

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

Evaluation board

LM5155EVM-FLY — LM5155 Flyback Controller Evaluation Module

The LM5155EVM-FLY evaluation module showcases the features and performance of the LM5155 as a wide input non-synchronous flyback controller. The standard configuration is designed to provide a regulated output of 5V at 4A from an input of 18V to 36V, switching at 250 kHz. This evaluation module is (...)
User guide: PDF
Not available on TI.com
Evaluation board

LM5155EVM-SEPIC — LM5155 SEPIC evaluation module

The LM5155EVM-SEPIC evaluation module showcases the features and performance of the LM5155 as wide input non-synchronous SEPIC controller. The standard configuration is designed to provide a regulated output of 12V at up to 2A from an input of 3V to 42V, switching at 2.2 MHz.
User guide: PDF | HTML
Not available on TI.com
Evaluation board

LM5156EVM-BST — LM5156 boost controller evaluation module

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 (...)

User guide: PDF
Not available on TI.com
Simulation model

Unencrypted LM5156-Q1 PSpice Transient Model Package (Rev. H)

SNVMBV9H.ZIP (205 KB) - PSpice Model
Download
Simulation model

Unencrypted LM5156x-Q1 PSpice Average Model (Rev. A)

SNVMC69A.ZIP (43 KB) - PSpice Model
Download
Calculation tool

SNVC224 — LM5155/56 Boost Controller Quick Start Calculator

Supported products & hardware

Supported products & hardware

Products
AC/DC & DC/DC controllers (external FET)
LM5155 — 2.2-MHz wide VIN, 1.5-A MOSFET driver, non-synchronous boost controller LM5155-Q1 — 2.2-MHz wide VIN, 1.5-A MOSFET driver, non-synchronous boost controller, AEC-Q100 qualified LM51551 — 2.2-MHz wide VIN nonsynchronous boost, flyback, & SEPIC controller with hiccup LM51551-Q1 — 2.2-MHz wide VIN, 1.5-A MOSFET driver, non-synchronous boost controller, hiccup mode protection LM5156 — 2.2-MHz wide VIN nonsynchronous boost, flyback, & SEPIC controller with dual random spread spectrum LM5156-Q1 — 2.2-MHz wide VIN nonsynchronous boost, flyback, & SEPIC controller with dual random spread spectrum LM51561 — 2.2MHz Wide Input Nonsynchronous Boost,SEPIC,Flyback Controller with Spread Spectrum LM51561-Q1 — 2.2-MHz wide VIN nonsynchronous boost, flyback, & SEPIC controller with spread spectrum and hiccup LM5156H — 2.2-MHz wide VIN nonsynchronous boost, flyback, & SEPIC controller with dual random spread spectrum LM5156H-Q1 — 2.2-MHz wide VIN nonsynchronous boost, flyback, & SEPIC controller with dual random spread spectrum
Hardware development
Evaluation board
LM5155EVM-BST — LM5155 Boost Controller Evaluation Module
Download
Calculation tool

SNVC240 — LM5155/56 Flyback Controller Quick Start Calculator

LM5155/56 Flyback Controller Quick Start Calculator
Supported products & hardware

Supported products & hardware

Products
AC/DC & DC/DC controllers (external FET)
LM5155 — 2.2-MHz wide VIN, 1.5-A MOSFET driver, non-synchronous boost controller LM5155-Q1 — 2.2-MHz wide VIN, 1.5-A MOSFET driver, non-synchronous boost controller, AEC-Q100 qualified LM51551 — 2.2-MHz wide VIN nonsynchronous boost, flyback, & SEPIC controller with hiccup LM51551-Q1 — 2.2-MHz wide VIN, 1.5-A MOSFET driver, non-synchronous boost controller, hiccup mode protection LM5156 — 2.2-MHz wide VIN nonsynchronous boost, flyback, & SEPIC controller with dual random spread spectrum LM5156-Q1 — 2.2-MHz wide VIN nonsynchronous boost, flyback, & SEPIC controller with dual random spread spectrum LM51561 — 2.2MHz Wide Input Nonsynchronous Boost,SEPIC,Flyback Controller with Spread Spectrum LM51561-Q1 — 2.2-MHz wide VIN nonsynchronous boost, flyback, & SEPIC controller with spread spectrum and hiccup LM51561H — 2.2-MHz wide VIN nonsynchronous boost, flyback, & SEPIC controller with spread spectrum and hiccup LM51561H-Q1 — 2.2-MHz wide VIN nonsynchronous boost, flyback, & SEPIC controller with spread spectrum and hiccup LM5156H — 2.2-MHz wide VIN nonsynchronous boost, flyback, & SEPIC controller with dual random spread spectrum LM5156H-Q1 — 2.2-MHz wide VIN nonsynchronous boost, flyback, & SEPIC controller with dual random spread spectrum
Hardware development
Evaluation board
LM5155EVM-FLY — LM5155 Flyback Controller Evaluation Module LM5156HEVM-FLY — LM5156H flyback controller evaluation module
Download
Calculation tool

SNVR481 — LM5155/56 SEPIC Controller Quick Start Calculator

Supported products & hardware

Supported products & hardware

Products
AC/DC & DC/DC controllers (external FET)
LM5155 — 2.2-MHz wide VIN, 1.5-A MOSFET driver, non-synchronous boost controller LM5155-Q1 — 2.2-MHz wide VIN, 1.5-A MOSFET driver, non-synchronous boost controller, AEC-Q100 qualified LM51551 — 2.2-MHz wide VIN nonsynchronous boost, flyback, & SEPIC controller with hiccup LM51551-Q1 — 2.2-MHz wide VIN, 1.5-A MOSFET driver, non-synchronous boost controller, hiccup mode protection LM5156 — 2.2-MHz wide VIN nonsynchronous boost, flyback, & SEPIC controller with dual random spread spectrum LM5156-Q1 — 2.2-MHz wide VIN nonsynchronous boost, flyback, & SEPIC controller with dual random spread spectrum LM51561 — 2.2MHz Wide Input Nonsynchronous Boost,SEPIC,Flyback Controller with Spread Spectrum LM51561-Q1 — 2.2-MHz wide VIN nonsynchronous boost, flyback, & SEPIC controller with spread spectrum and hiccup LM5156H — 2.2-MHz wide VIN nonsynchronous boost, flyback, & SEPIC controller with dual random spread spectrum LM5156H-Q1 — 2.2-MHz wide VIN nonsynchronous boost, flyback, & SEPIC controller with dual random spread spectrum
Hardware development
Evaluation board
LM5155EVM-SEPIC — LM5155 SEPIC evaluation module
Download
Reference designs

PMP41086 — 10.5W nonsynchronous SEPIC reference design with non-coupled inductors

This reference design showcases a nonsynchronous single-ended primary-inductor converter (SEPIC) with non-coupled inductors using the LM51561-Q1 device. The design covers an input voltage range of 6.0V to 28V. The output voltage is 21.0V with a maximum load current of 0.5A. The design has compact (...)
Test report: PDF
Reference designs

PMP31279 — 12-W nonsynchronous automotive SEPIC reference design

This reference design showcases a 1-A, 1.5-A peak, output current nonsynchronous SEPIC converter based on LM51561, which covers an input voltage range of 6 V to 36 V with an output voltage of 12 V. The efficiency reaches up to 90.5% at 12-V input voltage. The design can operate as low as 4.5 V to (...)
Test report: PDF
Reference designs

PMP41012 — 200-V to 480-V DC input, 22-W flyback isolated power supply reference design

This reference design provides an isolated 15-V and 22-W outputs with flyback topology with LM51561-Q1 controller. The power supply can be powered from the 200-V to 480-V DC input. This primary-side regulation design does not contain an optocoupler and uses a dual random spread spectrum which (...)
Test report: PDF
Reference designs

PMP31246 — Discontinuous mode SEPIC reference design with modulated output voltage

This automotive single-ended primary inductor converter (SEPIC) reference design uses either the LM5156-Q1 or LM51561-Q1 device to support a modulated output voltage with a sinusoidal waveform of 60 VPP up to 120 Hz. The magnetizing inductance is minimized to operate the power stage in (...)
Test report: PDF
Reference designs

PMP30805 — Tiny automotive SEPIC reference design

This tiny automotive SEPIC reference design contains a 6-W auxiliary power supply and is designed for a 12-V bias rail. The wide input accepts cranking down to 4.5 Vmin and surge up to 40 Vmax. Due to switching frequency of 2 MHz, the dual inductor is fairly small, resulting in excellent dynamic (...)
Test report: PDF
Schematic: PDF
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