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

LM25116 (ACTIVE)

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

 

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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WEBENCH® Power Designer is now even easier to use. Try it now.

WEBENCH® Designer LM25116

  Min   Max Range
Vin  V 6.0 to 42.0V
Vout  V 1.215 to 36V
Iout  A ≤ 20A
Ambient Temp  °C -40 to 125°C

Parametrics

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Part number Order 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 Type Control mode
LM25116 Order now 6     42     1.215     36     20     1     1     50     1000     4.6     Adjustable Current Limit
Enable
Frequency Synchronization
Light Load Efficiency
Synchronous Rectification    
98     -40 to 125     Catalog     HTSSOP | 20     Controller     Current Mode    
LM25117 Order now 4.5     42     0.8     41     20     1     1     50     750     4.8     Adjustable Current Limit
Enable
Frequency Synchronization
Light Load Efficiency
Synchronous Rectification
Tracking
UVLO Adjustable    
98     -40 to 125     Catalog     HTSSOP | 20
WQFN | 24    
Controller     Current Mode    
LM25141 Order now 3.8     42     1.5     15     20     1     1     350     2600     0.035     Adjustable Current Limit
Enable
Frequency Synchronization
Light Load Efficiency
Power Good
Pre-Bias Start-Up
Spread Spectrum
Synchronous Rectification
UVLO Fixed    
96     -40 to 125     Catalog     VQFN | 24     Controller     Current Mode    
LM25145 Order now 6     42     0.8     40     30     1     1     100     1000     1.8     Adjustable Current Limit
Enable
Frequency Synchronization
Light Load Efficiency
Power Good
Pre-Bias Start-Up
Synchronous Rectification
Tracking
UVLO Adjustable    
99     -40 to 125     Catalog     VQFN | 20     Controller     Voltage Mode    
LM3150 Order now 6     42     0.6     40     12     1     1     200     1000