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LM51561

ACTIVE

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

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Data sheet

LM51561

ACTIVE
Data sheet Order now

Product details

Vin (min) (V) 1.5 Vin (max) (V) 60 Iout (max) (A) 15 Operating temperature range (°C) -40 to 125 Control mode current mode Topology Boost, Flyback, SEPIC Rating Catalog Vout (min) (V) 1.5 Vout (max) (V) 300 Iq (typ) (A) 0.00049 Duty cycle (max) (%) 93 TI functional safety category Functional Safety-Capable
Vin (min) (V) 1.5 Vin (max) (V) 60 Iout (max) (A) 15 Operating temperature range (°C) -40 to 125 Control mode current mode Topology Boost, Flyback, SEPIC Rating Catalog Vout (min) (V) 1.5 Vout (max) (V) 300 Iq (typ) (A) 0.00049 Duty cycle (max) (%) 93 TI functional safety category Functional Safety-Capable
WSON (DSS) 12 6 mm² 3 x 2
  • 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
  • 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

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.

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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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 PDF | HTML 28 Jan 2021
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
EVM User's guide LM5156EVM-BST User's Guide (Rev. A) 22 Jun 2020

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