Automotive Grade 5.5-65V Wide Vin, Current Mode Dual Synchronous Buck Controller - LM5119Q

LM5119Q (ACTIVE)

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

 

Description

The LM5119 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 LM5119 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.

Features

  • LM5119-Q1 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

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Parametrics Compare all products in Buck Controller (External Switch)

 
Vin (Min) (V)
Vin (Max) (V)
Vout (Min) (V)
Vout (Max) (V)
Iout (Max) (A)
Regulated Outputs (#)
Number of Phases
Switching Frequency (Min) (kHz)
Switching Frequency (Max) (kHz)
Iq (Typ) (mA)
Features
Duty Cycle (Max) (%)
Operating Temperature Range (C)
Rating
Package Group
Control Mode
LM5119Q LM25117-Q1 LM25119Q LM5117-Q1 LM5140-Q1 LM5141-Q1 LM5642
5.5    4.5    4.5    5.5    3.8    3.8    4.5   
65    42    42    65    65    65    36   
0.8    0.8    0.8    0.8    1.5    1.5    1.236   
64    41    41.3    62    15    15    34   
15    20    40    20    40    20    20   
2    1    2    1    2    1    2   
2    1    2    1    1    1    2   
50    50    50    50    350    350    150   
750    750    750    750    2600    2600    250   
6    4.8    6    4.8    0.035    0.035    1.1   
Adjustable Current Limit
Enable
Frequency Synchronization
Light Load Efficiency
Synchronous Rectification
UVLO Adjustable   
Adjustable Current Limit
Enable
Frequency Synchronization
Light Load Efficiency
Synchronous Rectification
Tracking
UVLO Adjustable   
Adjustable Current Limit
Enable
Frequency Synchronization
Light Load Efficiency
Synchronous Rectification
UVLO Adjustable   
Adjustable Current Limit
Enable
Frequency Synchronization
Light Load Efficiency
Synchronous Rectification
Tracking
UVLO Adjustable   
Adjustable Current Limit
Enable
Frequency Synchronization
Light Load Efficiency
Phase Interleaving
Power Good
Synchronous Rectification   
Adjustable Current Limit
Enable
Frequency Synchronization
Light Load Efficiency
Power Good
Synchronous Rectification   
Adjustable Current Limit
Enable
Frequency Synchronization
Synchronous Rectification   
98    98    98    98    78    78    99   
-40 to 125    -40 to 125    -40 to 125    -40 to 125    -40 to 150    -40 to 150    -40 to 125   
Automotive    Automotive    Automotive    Automotive    Automotive    Automotive    Catalog   
WQFN    HTSSOP
WQFN   
WQFN    HTSSOP
WQFN   
VQFNP    VQFN    HTSSOP
TSSOP   
Current Mode    Current Mode      Current Mode    Current Mode    Current Mode    Current Mode   
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WEBENCH® Designer LM5119Q

  Min   Max Range
Vin  V 5.5 to 65.0V
Vout  V 0.8 to 60V
Iout  A ≤ 15A
Ambient Temp  °C -40 to 125°C


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