LM25116 (ACTIVE)

6-42V Wide Vin, Current Mode Synchronous Buck Controller

 

Recommended alternative parts

  • LM25117  -  4.5-42V wider Vin with added tracking feature

Description

The LM25116 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 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 operating frequency is programmable from 50 kHz to 1 MHz. The LM25116 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 20-pin HTSSOP package featuring an exposed die attach pad to aid thermal dissipation.

Features

  • Emulated Peak Current Mode
  • Wide Operating Range (Up to 42 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 36 V
  • Precision 1.5% Voltage Reference
  • Programmable Current Limit
  • Programmable Soft Start
  • Programmable Line Undervoltage Lockout
  • Automatic Switch to External Bias Supply
  • 20-Pin HTSSOP 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
LM25116 LM25117 LM25141 LM25145 LM3150 LM5116 LM5116WG TPS40200
6    4.5    3.8    6    6    6    6    4.5   
42    42    42    42    42    100    100    52   
1.215    0.8    1.5    0.8    0.6    1.215    1.215    0.7   
36    41    15    40    40    80    80    46   
20    20    20    30    12    20    20    3   
1    1    1    1    1    1    1    1   
1    1    1    1    1    1      1   
50    50    350    100    200    50    50    35   
1000    750    2600    1000    1000    1000    1000    500   
4.6    4.8    0.035    1.8    3.5    4.6    4.6    1.5   
Adjustable Current Limit
Enable
Frequency Synchronization
Light Load Efficiency
Synchronous Rectification   
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   
Adjustable Current Limit
Enable
Frequency Synchronization
Pre-Bias Start-Up
Synchronous Rectification
UVLO Adjustable   
Adjustable Current Limit
Enable
Frequency Synchronization
Light Load Efficiency
Synchronous Rectification
UVLO Adjustable   
Enable
Frequency Synchronization
Light Load Efficiency   
Frequency Synchronization   
98    98    99    99    96    98    98    90   
-40 to 125    -40 to 125    -40 to 125    -40 to 125    -40 to 125    -40 to 150    -40 to 125    -40 to 85   
Catalog    Catalog    Catalog    Catalog    Catalog    Catalog    Catalog    Catalog   
HTSSOP    HTSSOP
WQFN   
VQFN    VQFN    HTSSOP    HTSSOP    CFP    SOIC
SON   
Current Mode    Current Mode    Current Mode    Voltage Mode    COT with emulated ripple    Current Mode    Current Mode    Voltage Mode   
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WEBENCH® Designer LM25116

  Min   Max Range
Vin  V 6.0 to 42.0V
Vout  V 1.22 to 36.0V
Iout  A ≤ 20A
Ambient Temp  °C -40 to 125°C


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