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LM34966-Q1

ACTIVE

500-kHz wide VIN nonsynchronous boost, flyback, & SEPIC controller

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Data sheet

LM34966-Q1

ACTIVE
Data sheet Order now

Product details

Rating Automotive Topology Boost, Flyback, SEPIC Vin (max) (V) 40 Vin (min) (V) 1.5 Vout (max) (V) 300 Vout (min) (V) 1.5 Control mode current mode Features Adjustable current limit, Enable, Light-load efficiency, Nonsynchronous rectification, Power good, UVLO adjustable 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) 40 Vin (min) (V) 1.5 Vout (max) (V) 300 Vout (min) (V) 1.5 Control mode current mode Features Adjustable current limit, Enable, Light-load efficiency, Nonsynchronous rectification, Power good, UVLO adjustable 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
  • Suited for wide input operating range car battery applications
    • 3.5-V to 40-V operating range (45-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 45 V
    • Minimized battery drain
      • Low shutdown current ( IQ ≤ 2.6 µA )
      • Low operating current ( IQ ≤ 490 µA )
  • Small solution size and low cost
    • Integrated error amplifier allows primary-side regulation without optocoupler (flyback)
    • Minimized undershoot during cranking (start-stop application)
  • Higher efficiency with low-power dissipation
    • 100-mV ±7% accurate current limit threshold
    • Strong 1.0-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 500 kHz
  • Integrated protection features
    • Constant peak current limiting over input voltage
    • Hiccup mode overload protection
    • 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 LM34966-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
  • Suited for wide input operating range car battery applications
    • 3.5-V to 40-V operating range (45-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 45 V
    • Minimized battery drain
      • Low shutdown current ( IQ ≤ 2.6 µA )
      • Low operating current ( IQ ≤ 490 µA )
  • Small solution size and low cost
    • Integrated error amplifier allows primary-side regulation without optocoupler (flyback)
    • Minimized undershoot during cranking (start-stop application)
  • Higher efficiency with low-power dissipation
    • 100-mV ±7% accurate current limit threshold
    • Strong 1.0-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 500 kHz
  • Integrated protection features
    • Constant peak current limiting over input voltage
    • Hiccup mode overload protection
    • 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 LM34966-Q1 with the WEBENCH power designer

The LM34966-Q1 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 internal VCC regulator also supports BIAS pin operation up to 40 V (45-V absolute maximum) for automotive load dump. The switching frequency is dynamically programmable with an external resistor from 100 kHz to 500 kHz.

The LM34966-Q1 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 internal VCC regulator also supports BIAS pin operation up to 40 V (45-V absolute maximum) for automotive load dump. The switching frequency is dynamically programmable with an external resistor from 100 kHz to 500 kHz.

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Technical documentation

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Type Title Date
* Data sheet LM34966-Q1 500kHz Wide VIN Non-synchronous Boost/SEPIC/Flyback Controller datasheet PDF | HTML 23 Sep 2020
Functional safety information LM34966-Q1, LM5156x-Q1 Functional Safety, FIT Rate, Failure Mode Distribution (Rev. C) PDF | HTML 28 Apr 2021
Certificate LM34966EVM-FLY EU Declaration of Conformity (DoC) 10 Sep 2020

Design & development

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

Evaluation board

LM34966EVM-FLY — LM34966 flyback controller evaluation module

The LM34966EVM-FLY evaluation module showcases the features and performance of the LM34966-Q1 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 evaluation (...)
User guide: PDF | HTML
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Simulation model

LM34966-Q1 PSpice Transient Model (Rev. B)

SNVMC41B.ZIP (222 KB) - PSpice Model
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HTSSOP (PWP) 14 Ultra Librarian
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