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LM51561H-Q1

ACTIVE

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

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Data sheet

LM51561H-Q1

ACTIVE
Data sheet Order now

Product details

Rating Automotive Topology Boost, Flyback, SEPIC Vin (max) (V) 60 Vin (min) (V) 1.5 Vout (max) (V) 300 Vout (min) (V) 1.5 Control mode current mode Features Adjustable current limit, Enable, Frequency synchronization, Hiccup mode protection, Light-load efficiency, Nonsynchronous rectification, Power good, Spread Spectrum, UVLO adjustable EMI features Frequency Dithering, Spread Spectrum Duty cycle (max) (%) 93 Iq (typ) (A) 0.00049 TI functional safety category Functional Safety-Capable Operating temperature range (°C) -40 to 150
Rating Automotive Topology Boost, Flyback, SEPIC Vin (max) (V) 60 Vin (min) (V) 1.5 Vout (max) (V) 300 Vout (min) (V) 1.5 Control mode current mode Features Adjustable current limit, Enable, Frequency synchronization, Hiccup mode protection, Light-load efficiency, Nonsynchronous rectification, Power good, Spread Spectrum, UVLO adjustable EMI features Frequency Dithering, Spread Spectrum Duty cycle (max) (%) 93 Iq (typ) (A) 0.00049 TI functional safety category Functional Safety-Capable Operating temperature range (°C) -40 to 150
HTSSOP (PWP) 14 32 mm² 5 x 6.4
  • AEC-Q100 Qualified for automotive applications
    • Temperature grade 1: –40°C to +125°C TA
    • Maximum operating temperature 150°C TJ
  • Functional Safety-Capable
    • Documentation available to aid functional safety system design
  • 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
    • Integrated error amplifier allows primary-side regulation without optocoupler (flyback)
    • Minimized undershoot during cranking (start-stop application)
  • EMI mitigation
    • Selectable dual random spread spectrum
  • 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
  • 14-Pin HTSSOP package (5.0 mm × 4.4 mm)
  • Create a custom design using the LM5156xH-Q1 with the WEBENCH power designer
  • AEC-Q100 Qualified for automotive applications
    • Temperature grade 1: –40°C to +125°C TA
    • Maximum operating temperature 150°C TJ
  • Functional Safety-Capable
    • Documentation available to aid functional safety system design
  • 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
    • Integrated error amplifier allows primary-side regulation without optocoupler (flyback)
    • Minimized undershoot during cranking (start-stop application)
  • EMI mitigation
    • Selectable dual random spread spectrum
  • 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
  • 14-Pin HTSSOP package (5.0 mm × 4.4 mm)
  • Create a custom design using the LM5156xH-Q1 with the WEBENCH power designer

The LM5156xH-Q1 (LM5156H-Q1 and LM51561H-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 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 LM5156xH-Q1 (LM5156H-Q1 and LM51561H-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 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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Technical documentation

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Type Title Date
* Data sheet LM5156xH-Q1 2.2-MHz Wide VIN 65-V Non-synchronous Boost/SEPIC/Flyback Controller with 150°C Maximum Junction Temperature datasheet PDF | HTML 23 Sep 2020
White paper Isolated Bias Power Supply Architecture for HEV and EV Traction Inverters PDF | HTML 11 Oct 2023
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
Functional safety information LM34966-Q1, LM5156x-Q1 Functional Safety, FIT Rate, Failure Mode Distribution (Rev. C) PDF | HTML 28 Apr 2021

Design & development

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

Evaluation board

LM5156HEVM-FLY — LM5156H flyback controller evaluation module

The LM5156HEVM-FLY evaluation module showcases the features and performance of the LM51561 (TSSOP package) as 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 (...)
User guide: PDF | HTML
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Calculation tool

SNVC240 — LM5155/56 Flyback Controller Quick Start Calculator

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

Supported products & hardware

Products
DC/DC controllers
  • 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
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HTSSOP (PWP) 14 Ultra Librarian
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