LM5116 (ACTIVE)

6-100V Wide Vin, Current Mode Synchronous Buck Controller

 

Description

The LM5116 is a 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 utilizing an emulated current ramp. Current mode control provides inherent line feed-forward, 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 operating frequency is programmable from 50 kHz to 1 MHz. The LM5116 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 low quiescent current shutdown disables the controller and consumes less than 10 µA of total input current.

Additional features include a high-voltage bias regulator, automatic switch-over to external bias for improved efficiency, thermal shutdown, frequency synchronization, cycle-by-cycle current limit, and adjustable line undervoltage lockout. The device is available in a power enhanced HTSSOP-20 package featuring an exposed die attach pad to aid thermal dissipation.

Features

  • Emulated Peak Current Mode
  • Wide Operating Range Up to 100 V
  • Low IQ Shutdown (< 10 µA)
  • Drives Standard or Logic Level MOSFETs
  • Robust 3.5-A Peak Gate Drive
  • Free-run or Synchronous Operation to 1 MHz
  • Optional Diode Emulation Mode
  • Programmable Output from 1.215 V to 80 V
  • Precision 1.5% Voltage Reference
  • Programmable Current Limit
  • Programmable Soft-Start
  • Programmable Line Undervoltage Lockout
  • Automatic Switch to External Bias Supply
  • HTSSOP-20 Exposed Pad
  • Thermal Shutdown

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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
LM5116 LM25116 LM25145 LM5116WG LM5117 LM5141 LM5145
6    6    6    6    5.5    3.8    6   
100    42    42    100    65    65    75   
1.215    1.215    0.8    1.215    0.8    1.5    0.8   
80    36    40    80    62    15    60   
20    20    30    20    20    20    30   
1    1    1    1    1    1    1   
1    1    1      1    1    1   
50    50    100    50    50    350    100   
1000    1000    1000    1000    750    2600    1000   
4.6    4.6    1.8    4.6    4.8    0.035    1.5   
Adjustable Current Limit
Enable
Frequency Synchronization
Light Load Efficiency
Synchronous Rectification
UVLO Adjustable   
Adjustable Current Limit
Enable
Frequency Synchronization
Light Load Efficiency
Synchronous Rectification   
Adjustable Current Limit
Enable
Frequency Synchronization
Light Load Efficiency
Power Good
Pre-Bias Start-Up
Synchronous Rectification
Tracking
UVLO Adjustable   
Enable
Frequency Synchronization
Light Load Efficiency   
Adjustable Current Limit
Enable
Frequency Synchronization
Light Load Efficiency
Synchronous Rectification
Tracking
UVLO Adjustable   
Adjustable Current Limit
Enable
Frequency Synchronization
Light Load Efficiency
Power Good
Pre-Bias Start-Up
Spread Spectrum
Synchronous Rectification
UVLO Fixed   
Adjustable Current Limit
Enable
Frequency Synchronization
Light Load Efficiency
Power Good
Pre-Bias Start-Up
Synchronous Rectification
Tracking
UVLO Adjustable   
98    98    99    98    98    99    99   
-40 to 150    -40 to 125    -40 to 125    -40 to 125    -40 to 125    -40 to 125    -40 to 125   
Catalog    Catalog    Catalog    Catalog    Catalog    Catalog    Catalog   
HTSSOP    HTSSOP    VQFN    CFP    HTSSOP
WQFN   
VQFN    VQFN   
Current Mode    Current Mode    Voltage Mode    Current Mode    Current Mode    Current Mode    Voltage Mode   

Other qualified versions of LM5116

Version Part Number Definition
High-Temperature LM5116-HT High-Temperature product for harsh environments
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WEBENCH® Designer LM5116

  Min   Max Range
Vin  V 6.0 to 100.0V
Vout  V 1.22 to 80.0V
Iout  A ≤ 20A
Ambient Temp  °C -40 to 125°C


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