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LM5119Q

ACTIVE

Automotive Grade 5.5-65V Wide Vin, Current Mode Dual Synchronous Buck Controller

Product details

Vin (min) (V) 5.5 Vin (max) (V) 65 Vout (min) (V) 0.8 Vout (max) (V) 64 Iout (max) (A) 15 Iq (typ) (mA) 6 Switching frequency (min) (kHz) 50 Switching frequency (max) (kHz) 750 Features Adjustable current limit, Enable, Frequency synchronization, Light Load Efficiency, Synchronous Rectification, UVLO adjustable Operating temperature range (°C) -40 to 125 Regulated outputs (#) 2 Number of phases 2 Rating Automotive Control mode current mode Type Controller
Vin (min) (V) 5.5 Vin (max) (V) 65 Vout (min) (V) 0.8 Vout (max) (V) 64 Iout (max) (A) 15 Iq (typ) (mA) 6 Switching frequency (min) (kHz) 50 Switching frequency (max) (kHz) 750 Features Adjustable current limit, Enable, Frequency synchronization, Light Load Efficiency, Synchronous Rectification, UVLO adjustable Operating temperature range (°C) -40 to 125 Regulated outputs (#) 2 Number of phases 2 Rating Automotive Control mode current mode Type Controller
WQFN (RTV) 32 25 mm² 5 x 5
  • Qualified for Automotive Applications
  • AEC-Q100 Qualified With the Following Results:
    • Device Temperature Grade 1: –40°C to 125°C Ambient Operating Temperature Range
    • Device HBM ESD Classification Level 1C
    • Device CDM ESD Classification Level C4A
  • Emulated Peak Current Mode Control
  • Wide Operating Range (5.5 V to 65 V)
  • Easily Configurable for Dual Outputs or Interleaved Single Output
  • Robust 3.3-A Peak Gate Drive
  • Switching Frequency Programmable to 750 kHz
  • Optional Diode Emulation Mode
  • Programmable Output from 0.8 V
  • Precision 1.5% Voltage Reference
  • Programmable Current Limit
  • Hiccup Mode Overload Protection
  • Programmable Soft-Start
  • Programmable Line Undervoltage Lockout
  • Automatic Switch-Over to External Bias Supply
  • Channel2 Enable Logic Input
  • Thermal Shutdown
  • Leadless 32-Pin WQFN Package
  • Qualified for Automotive Applications
  • AEC-Q100 Qualified With the Following Results:
    • Device Temperature Grade 1: –40°C to 125°C Ambient Operating Temperature Range
    • Device HBM ESD Classification Level 1C
    • Device CDM ESD Classification Level C4A
  • Emulated Peak Current Mode Control
  • Wide Operating Range (5.5 V to 65 V)
  • Easily Configurable for Dual Outputs or Interleaved Single Output
  • Robust 3.3-A Peak Gate Drive
  • Switching Frequency Programmable to 750 kHz
  • Optional Diode Emulation Mode
  • Programmable Output from 0.8 V
  • Precision 1.5% Voltage Reference
  • Programmable Current Limit
  • Hiccup Mode Overload Protection
  • Programmable Soft-Start
  • Programmable Line Undervoltage Lockout
  • Automatic Switch-Over to External Bias Supply
  • Channel2 Enable Logic Input
  • Thermal Shutdown
  • Leadless 32-Pin WQFN Package

The LM5119Q device is a dual synchronous buck controller intended for step-down regulator applications from a high voltage or widely varying input supply. The control method is based upon current mode control using an emulated current ramp. Current mode control provides inherent line feedforward, cycle-by-cycle current limiting and ease-of-loop compensation. The use of an emulated control ramp reduces noise sensitivity of the pulse-width modulation circuit, allowing reliable control of very small duty cycles necessary in high input voltage applications. The switching frequency is programmable from 50 kHz to 750 kHz. The LM5119Q device drives external high-side and low-side NMOS power switches with adaptive dead-time control. A user-selectable diode emulation mode enables discontinuous mode operation for improved efficiency at light load conditions. A high voltage bias regulator with automatic switch-over to external bias further improves efficiency. Additional features include thermal shutdown, frequency synchronization, cycle-by-cycle and hiccup mode current limit and adjustable line undervoltage lockout. The device is available in a power enhanced leadless 32-pin WQFN package featuring an exposed die attach pad to aid thermal dissipation.

The LM5119Q device is a dual synchronous buck controller intended for step-down regulator applications from a high voltage or widely varying input supply. The control method is based upon current mode control using an emulated current ramp. Current mode control provides inherent line feedforward, cycle-by-cycle current limiting and ease-of-loop compensation. The use of an emulated control ramp reduces noise sensitivity of the pulse-width modulation circuit, allowing reliable control of very small duty cycles necessary in high input voltage applications. The switching frequency is programmable from 50 kHz to 750 kHz. The LM5119Q device drives external high-side and low-side NMOS power switches with adaptive dead-time control. A user-selectable diode emulation mode enables discontinuous mode operation for improved efficiency at light load conditions. A high voltage bias regulator with automatic switch-over to external bias further improves efficiency. Additional features include thermal shutdown, frequency synchronization, cycle-by-cycle and hiccup mode current limit and adjustable line undervoltage lockout. The device is available in a power enhanced leadless 32-pin WQFN package featuring an exposed die attach pad to aid thermal dissipation.

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Technical documentation

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* Data sheet LM5119Q Wide Input Range Dual Synchronous Buck Controller datasheet 29 Jan 2018
White paper Overcoming Challenges in Designing Step-Dwn Reg Apps w/40V Input Voltage (Rev. A) 03 Jul 2018
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Design & development

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Simulation tool

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WQFN (RTV) 32 View options

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