LM2854 - 4A 500 kHz / 1 MHz Synchronous SIMPLE SWITCHER® Buck Regulator from the PowerWise® Family
Datasheet Packaging Samples & Pricing Eval. Boards Reliability Design Tools Application Notes Knowledge Base

Features
•Input voltage range of 2.95V to 5.5V
•Maximum load current of 4A
•Wide bandwidth voltage mode control loop, partial internal compensation
•Fixed switching frequency of 500 kHz or 1 MHz
•35 mΩ integrated MOSFET switches
•Adjustable output voltage down to 0.8V
•Optimized reference voltage initial accuracy and temperature drift
•External soft-start control with tracking capability
•Enable pin with hysteresis
•Low standby current of 230 µA
•Pre-biased load startup capability
•Integrated UVLO, OCP and thermal shutdown
•100% duty cycle capability
•eTSSOP-16 exposed pad package

General Description

The LM2854 PowerWise ® SIMPLE SWITCHER ® buck regulator is a 500 kHz or 1 MHz step-down switching voltage regulator capable of driving up to a 4A load with exceptional power conversion efficiency, line and load regulation, and output accuracy. More...


Applications

•Low Voltage POL Regulation from 5V or 3.3V Rail
•Local Solution for FPGA/DSP/ASIC/µP Core or I/O Power
•Broadband Networking and Communications Infrastructure
•Portable Computing
  Typical Application
*click for larger image


ParametersValues
Output Current 4000 mA
Input Min Voltage 2.95 Volt
Input Max Voltage 5.5 Volt
Output Min 0.8 Volt
Output Max 5 Volt
Frequency Min 500 kHz
Frequency Max 1000 kHz
Efficiency (peak) 98 %
On/Off Pin Yes
Error Flag No
SoftStart Yes
Sync Pin No
Inverting No
Flyback No
RegType Switching Regulator
Temperature Min -40 deg C
Temperature Max 85 deg C
Adjustable Output Yes
Adj Switch Frequency No
PWM Mode Undefined
Topology Synchronous Buck
Special Features Undefined
Step-Down Yes
Multiple Output Capability No
Output Power Undefined Watt
Output Voltage Undefined Volt
Output Range Undefined
Feedback Voltage Undefined Volt
Regulator Family SIMPLE SWITCHER
Automotive No
PowerWise Yes
Synchronous Rectification Yes


Typical Performance

*click for larger image


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LM2854X
 
2.95 <=		 V in Lower
 V		  
<=		 V in Upper
 V		  
<= 5.50
V out 0.80 <=  V <= 4.50
I out    A <= 4.00
Ambient Temperature  °C <= 100


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Also Recommended
LM20124▲4A Full-featured, 1 MHz Switching Frequency
LM2852▲2A Version, 500kHz Or 1.5MHz Switching Frequency
LM2853▲3A Version, 550 KHz Switching Frequency
Additional Resources
Design Tools

Application Notes


Block Diagram

*click for larger image



Datasheet
RoHS Compliance Information Size in KbytesDate Click link below to Download
LM2854 4A 500 kHz / 1 MHz Synchronous SIMPLE SWITCHER® Buck Regulator 543
Kbytes		 5-Nov-08 Download
LM2854 4A 500 kHz / 1 MHz Synchronous SIMPLE SWITCHER® Buck Regulator (Japanese)
 638 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
LM2854EVALEvaluation Board for the LM2854Full productionN/A
 
Buy Now 		1+$69.501-
8 weeksN/A
LM2854MH-1000TSSOP EXP PAD16NOPB1260RoHS N/A Full productionN/A
Samples
Buy Now 		1K+$2.40rail
of
92		NSUZXYTT
LM2854
-1000
8 weeksN/A
LM2854MH-500TSSOP EXP PAD16NOPB1260RoHS N/A Full productionN/A
Samples
Buy Now 		1K+$2.40rail
of
92		NSUZXYTT
LM2854
-500
6 weeksN/A
LM2854MHX-1000TSSOP EXP PAD16NOPB1260RoHS N/A Full productionN/A
 
Buy Now 		1K+$2.40reel
of
2500		NSUZXYTT
LM2854
-1000
6 weeksN/A
LM2854MHX-500TSSOP EXP PAD16NOPB1260RoHS N/A Full productionN/A
 
Buy Now 		1K+$2.40reel
of
2500		NSUZXYTT
LM2854
-500
8 weeksN/A
LM2854-1000EVALLM2854-1000 - 1 MHz Buck RegulatorFull productionN/A
 
Buy Now 		1+$69.501-
8 weeksN/A

General Description

The LM2854 PowerWise ® SIMPLE SWITCHER ® buck regulator is a 500 kHz or 1 MHz step-down switching voltage regulator capable of driving up to a 4A load with exceptional power conversion efficiency, line and load regulation, and output accuracy. The LM2854 can accept an input voltage rail between 2.95V and 5.5V and deliver an adjustable and highly accurate output voltage as low as 0.8V. Externally established soft-start with a small capacitor facilitates controlled start-up, and the LM2854 is capable of starting gracefully into a pre-biased output voltage. Partial internal compensation reduces the number of external passive components and PC board space typically necessary in a voltage mode buck converter application, yet preserving flexibility to deal with ceramic and/or electrolytic based load capacitors. Lossless cycle-by-cycle peak current limit is used to protect the load from an overcurrent or short-circuit fault, and an enable comparator simplifies sequencing applications. The LM2854 is available in an exposed pad TSSOP-16 package that enhances the thermal performance of the regulator.

Reliability Metrics

Part Number Process EFR Reject EFR Sample Size PPM LTA Rejects LTA Device Hours FITS MTTF (Hours)
LM2854MH-1000CMOS70184060010890004309006723
LM2854MH-500CMOS70184060010890004309006723
LM2854MHX-1000CMOS70184060010890004309006723
LM2854MHX-500CMOS70184060010890004309006723

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    
Article - Voltage Mode Compensation of Buck Regulators     View    

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Application Notes

TitleSize in Kbytes Date Click link below to Download
AN-1880: Application Note 1880 LM2854 1MHz Buck Regulator Demo Board 692
Kbytes		 27-Aug-08 Download
AN-1786: Application Note 1786 LM2854 500 kHz Buck Regulator Evaluation Board 760
Kbytes		 2-Apr-08 Download

If you have trouble printing or viewing PDF file(s), see Printing Problems.

More Application Notes

TitleSize in Kbytes Date Click link below to Download
AN-1397: Application Note 1397 LM2852X Demonstration Board 518
Kbytes		 21-Sep-05 Download
AN-1397 (Chinese): Application Note 1397 LM2852X Demonstration Board
 213 Kbytes  
AN-1973: Application Note 1973 Benefits and Challenges of High-Frequency Regulators 348
Kbytes		 25-Jun-09 Download
AN-1343: Application Note 1343 LM2852 Evaluation Board (500kHz version) 818
Kbytes		 19-May-05 Download
AN-1513: Application Note 1513 LM2853 Evaluation Board 530
Kbytes		 30-Oct-06 Download

If you have trouble printing or viewing PDF file(s), see Printing Problems.

[Information as of 7-Nov-2009]