LM25116 - Wide Range Synchronous Buck Controller from the PowerWise® Family
Datasheet Packaging Samples & Pricing Eval. Boards Reliability Design Tools Knowledge Base

Features
Emulated peak current mode
Wide operating range up to 42V
Low IQ shutdown (<10µA)
Drives standard or logic level MOSFETs
Robust 3.5A peak gate drive
Free-run or synchronous operation to 1MHz
Optional diode emulation mode
Programmable output from 1.215V to 36V
Precision 1.5% voltage reference
Programmable current limit
Programmable soft-start
Programmable line under-voltage lockout
Automatic switch to external bias supply
TSSOP-20EP exposed pad
Thermal shutdown

General Description


The LM25116 is a synchronous buck controller intended for step-down regulator applications from a high voltage or widely varying input supply. More...


  Typical Application
click for larger image


ParametersValues
Output Current 20000 mA
Input Min Voltage 6 Volt
Input Max Voltage 42 Volt
Feedback Voltage 1.215 Volt
Feedback Tolerance 1.5 %
Frequency Min 50 kHz
Frequency Max 1000 kHz
Efficiency (peak) 95 %
Output Range 1.215V to 36V
Adj Switch Frequency Yes
Adjustable Output Yes
Synchronous Rectification Yes
On/Off Pin Yes
Error Flag No
SoftStart Yes
Sync Pin Yes
Inverting No
Flyback No
Lossless Current Sense Yes
RegType Switching Controller
Temperature Min -40 deg C
Temperature Max 125 deg C
Channels 1 Channels
Special Features High step-down ratio using emulated current mode control
Topology Buck
PWM Mode Current
Step-Down Yes
Step-Up No
Output Max 36 Volt
Output Min 1.215 Volt
Automotive Yes
PowerWise Yes


Typical Performance


*click for larger image


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LM25116

 
6.00 <=
V in Lower
 V
 
<=
V in Upper
 V
 
<= 42.00
V out 1.22 <=  V <= 36.00
I out    A <= 20.00
Ambient Temperature  °C <= 100


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Also Recommended
LM5116100V Input Voltage Max
LM5116WG100V Input CERPACK-20 With No Thermal Shutdown
LM5118Buck-Boost
Additional Resources
Design Tools


Block Diagram


*click for larger image



Datasheet
RoHS Compliance Information Size in KbytesDate Click link below to Download
LM25116 Wide Range Synchronous Buck Controller 622
Kbytes
8-Dec-08 Download
LM25116 Wide Range Synchronous Buck Controller (Japanese)
984 Kbytes   Download

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Package Availability, Models, Samples & Pricing
Part NumberPackageFactory Lead TimeModelsSamples &
Electronic
Orders
Budgetary PricingStd
Pack
Size
Package
Marking
Format
TypePinsSpec.MSL
Rating
Peak
Reflow
RoHS
Report
CAD
Symbols
WeeksQtyQty$US each
LM25116MHTSSOP EXP PAD20NOPB1260RoHS Download Full productionN/A
Samples
Buy Now
1K+$2.50rail
of
73
NSUZXYTT
LM25116
MH
6 weeks1000
LM25116MHXTSSOP EXP PAD20NOPB1260RoHS Download Full productionN/A
 
Buy Now
1K+$2.50reel
of
2500
NSUZXYTT
LM25116
MH
6 weeks7500
LM25116EVALEvaluation Board for LM25116 Wide Range Synchronous Buck ControllerFull productionN/A
 
Buy Now
1+$70.501-
8 weeksN/A

General 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 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 50kHz to 1MHz. 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 10µA 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 under-voltage lockout. The device is available in a power enhanced TSSOP-20 package featuring an exposed die attach pad to aid thermal dissipation.

Reliability Metrics


Part Number Process EFR Reject EFR Sample Size PPM LTA Rejects LTA Device Hours FITS MTTF (Hours)
LM25116MHABCD150XV2036010011554964327875145
LM25116MHXABCD150XV2036010011554964327875145

Note: The Early Failure Rates (EFR) were calculated as point estimate PPM based on rejects and sample size for EFR. The Long Term Failure Rates were calculated at 60% confidence using the Arrhenius equation at 0.7eV activation energy and derating the assumed stress temperature of 150°C to an application temperature of 55°C.

For more information on Reliability Metrics, please click here.


Design Tools


TitleSize in Kbytes Date Click link below to Download    
Current Mode Modeling - Reference Guide 1372 Kbytes 1-Aug-2007 View Online Download  
LM5116 Quick Start Component Calculator 362 Kbytes 25-Feb-2008 View    
Understanding and Applying Current-Mode Control Theory 427 Kbytes 8-Jan-2008 View Online Download  

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Application Notes


TitleSize in Kbytes Date Click link below to Download
AN-1617: Application Note 1617 LM25116 Evaluation Board 314
Kbytes
10-Apr-07 Download
AN-1596: Application Note 1596 LM5116 Evaluation Board 299
Kbytes
18-May-07 Download
AN-1713: Application Note 1713 LM5116-12 Evaluation Board 313
Kbytes
3-Oct-07 Download
AN-1628: Application Note 1628 Minimizing FET Losses For a High Input Rail Buck Converter 91
Kbytes
5-Sep-07 Download
AN-1628 (Japanese): Application Note 1628 Minimizing FET Losses For a High Input Rail Buck Converter
115 Kbytes   Download
AN-1628 (Chinese): Application Note 1628 Minimizing FET Losses For a High Input Rail Buck Converter
283 Kbytes  

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[Information as of 8-Nov-2009]