LM25116 6-42V Wide Vin, Current Mode Synchronous Buck Controller | TI.com

LM25116 (ACTIVE)

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

6-42V Wide Vin, Current Mode Synchronous Buck Controller - LM25116
 

Recommended alternative parts

  • LM25145  -  A next-generation solution that provides comparable functionality, smaller solution size and higher efficiency over a 6V to 42V operating voltage range.

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