LM3671 - 2MHz, 600mA Step-Down DC-DC Converter from the PowerWise® Family
Datasheet Packaging Samples & Pricing Eval. Boards Reliability Design Tools Application Notes Knowledge Base

Features
•16 µA typical quiescent current
•600 mA maximum load capability
•2 MHz PWM fixed switching frequency (typ.)
•Automatic PFM/PWM mode switching
•Internal synchronous rectification for high efficiency
•Internal soft start
•0.01 µA typical shutdown current
•Operates from a single Li-Ion cell battery
•Only three tiny surface-mount external components required (one inductor, two ceramic capacitors)
•Current overload and Thermal shutdown protection
•Available in fixed output voltages and adjustable version
•SOT23-5, 5-bump micro SMD and 6-pin LLP packages

General Description

The LM3671 step-down DC-DC converter is optimized for powering low voltage circuits from a single Li-Ion cell battery and input voltage rails from 2.7V to 5.5V. More...


Applications

•Mobile phones
•PDAs
•MP3 players
•W-LAN
•Portable instruments
•Digital still cameras
•Portable Hard disk drives
  Typical Application
click for larger image


ParametersValues
Output Current 600 mA
Input Min Voltage 2.7 Volt
Input Max Voltage 5.5 Volt
Output Min 1.8, 2.5, 1.1, 1.875, 1.2, 3.3, 1.375, 1.25, 2.8, 1.6, 1.5 Volt
Output Max 1.8, 2.5, 1.875, 1.2, 3.3, 1.375, 1.25, 2.8, 1.6, 1.5 Volt
Frequency Min 2000 kHz
Frequency Max 2000 kHz
Efficiency (peak) 96 %
On/Off Pin Yes
Error Flag No
SoftStart Yes
Sync Pin No
Inverting No
Flyback No
RegType Switching Regulator
Temperature Min -30 deg C
Temperature Max 85 deg C
Adjustable Output No, Yes
Adj Switch Frequency No
PWM Mode Voltage with input feedforward
Topology Synchronous Buck
Special Features Pin-selectable PWM/PFM modes, Iq=15uA, 100% duty cycle, internal compensation, ceramic-cap stable, only 3 external components
Step-Down Yes
Multiple Output Capability No
Output Power Undefined Watt
Output Voltage 1.8, Undefined, 2.5, 1.875, 1.2, 3.3, 1.375, 1.25, 2.8, 1.6, 1.5 Volt
Output Range 1.1V to 3.3V
Switching Frequency 2000 kHz
Feedback Voltage Undefined Volt
Regulator Family Undefined
PowerWise Yes
Synchronous Rectification Yes


Typical Performance

click for larger image


  WEBENCH Live Simulation!
WEBENCH Power Designer My Designs

LM3671
 
2.50 <=		 V in Lower
 V		  
<=		 V in Upper
 V		  
<= 5.50
V out 1.00 <=  V <= 3.30
I out    A <= 0.60
Ambient Temperature  °C <= 100


What are WEBENCH® tools?

Also Recommended
LM2651▲1.5A Output Current
LM2734▲1A Output Current, Wider Vin Range, SOT-23
LM3670▲1 MHz Switching Frequency, 350mA Output Current
LM3674▲With PWM Only Mode
Additional Resources
Online Seminars Design Tools

Application Notes


Block Diagram

click for larger image



Datasheet
RoHS Compliance Information Size in KbytesDate Click link below to Download
LM3671 2MHz, 600mA Step-Down DC-DC Converter 7467
Kbytes		 28-Oct-08 Download
LM3671 2MHz, 600mA Step-Down DC-DC Converter (Japanese)
 2487 Kbytes   Download

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


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
LM3671MF-1.5EV2MHz, 600mA Step-Down DC-DC Converter in SOT23-5 and 5-Bump Micro SMDFull productionN/A
 
Buy Now 		1+$53.001-
6 weeksN/A
LM3671MF-1.8EV2MHz, 600mA Step-Down DC-DC Converter in SOT23-5 and 5-Bump Micro SMDFull productionN/A
 
Buy Now 		1+$53.001-
6 weeksN/A
LM3671TL-1.5EVLM3671TL-1.5 Evaluation BoardFull productionN/A
 
Buy Now 		1+$53.001-
6 weeksN/A
LM3671TL-1.8EV2MHz, 600mA Step-Down DC-DC Converter in SOT23-5 and 5-Bump Micro SMDFull productionN/A
 
Buy Now 		1+$53.001-
6 weeksN/A
LM3671LC-1.2LLP COL6NOPB1260RoHS Download Full productionN/A
Samples
Buy Now 		1K+$1.10reel
of
1000		XTT
S39
6 weeksN/A
LM3671LC-1.3LLP COL6NOPB1260RoHS Download Full productionN/A
Samples
Buy Now 		1K+$1.10reel
of
1000		XTT
S40
12 weeksN/A
LM3671LC-1.6LLP COL6NOPB1260RoHS Download Full productionN/A
Samples
Buy Now 		1K+$1.10reel
of
1000		XTT
S41
12 weeksN/A
LM3671LC-1.8LLP COL6NOPB1260RoHS Download Full productionN/A
Samples
Buy Now 		1K+$1.10reel
of
1000		XTT
S42
12 weeksN/A
LM3671LCX-1.2LLP COL6NOPB1260RoHS Download Full productionN/A
 
Buy Now 		1K+$1.10reel
of
4500		XTT
S39
12 weeksN/A
LM3671LCX-1.3LLP COL6NOPB1260RoHS Download Full productionN/A
 
Buy Now 		1K+$1.10reel
of
4500		XTT
S40
12 weeksN/A
LM3671LCX-1.6LLP COL6NOPB1260RoHS Download Full productionN/A
 
Buy Now 		1K+$1.10reel
of
4500		XTT
S41
12 weeksN/A
LM3671LCX-1.8LLP COL6NOPB1260RoHS Download Full productionN/A
 
Buy Now 		1K+$1.10reel
of
4500		XTT
S42
12 weeksN/A
LM3671MF-1.2SOT-235NOPB
STD		1
1		260
260		RoHS Download Full productionN/A
Samples
Buy Now 		1K+$1.00reel
of
1000		SBPB
XTT
6 weeks2000
LM3671MF-1.25SOT-235NOPB1260RoHS Download Full productionN/A
Samples
Buy Now 		1K+$1.00reel
of
1000		SDRB
XTT
6 weeks2000
LM3671MF-1.375SOT-235NOPB1260RoHS Download Full productionN/A
Samples
Buy Now 		1K+$1.00reel
of
1000		SEDB
XTT
6 weeksN/A
LM3671MF-1.5SOT-235NOPB
STD		1
1		260
260		RoHS Download Full productionN/A
Samples
Buy Now 		1K+$1.00reel
of
1000		SBRB
XTT
6 weeks2000
LM3671MF-1.6SOT-235NOPB1260RoHS Download Full productionN/A
Samples
Buy Now 		1K+$1.00reel
of
1000		SDUB
XTT
6 weeks500
LM3671MF-1.8SOT-235NOPB1260RoHS Download Full productionN/A
Samples
Buy Now 		1K+$1.00reel
of
1000		SBSB
XTT
6 weeks1000
LM3671MF-1.875SOT-235NOPB
STD		1
1		260
260		RoHS Download Full productionN/A
Samples
Buy Now 		1K+$1.00reel
of
1000		SDVB
XTT
6 weeks2000
LM3671MF-2.5SOT-235NOPB1260RoHS Download Full productionN/A
Samples
Buy Now 		1K+$1.00reel
of
1000		SJRB
XTT
6 weeks1000
LM3671MF-2.8SOT-235NOPB1260RoHS Download Full productionN/A
Samples
Buy Now 		1K+$1.00reel
of
1000		SJSB
XTT
12 weeks50
LM3671MF-3.3SOT-235NOPB
STD		1
1		260
260		RoHS Download Full productionN/A
Samples
Buy Now 		1K+$1.00reel
of
1000		SJEB
XTT
6 weeks1000
LM3671MF-ADJSOT-235NOPB
STD		1
1		260
260		RoHS Download Full productionN/A
Samples
Buy Now 		1K+$1.00reel
of
1000		SBTB
XTT
6 weeks2000
LM3671MFX-1.2SOT-235NOPB1260RoHS Download Full productionN/A
 
Buy Now 		1K+$1.00reel
of
3000		SBPB
XTT
6 weeks5000
LM3671MFX-1.25SOT-235NOPB1260RoHS Download Full productionN/A
 
Buy Now 		1K+$1.00reel
of
3000		SDRB
XTT
6 weeksN/A
LM3671MFX-1.375SOT-235NOPB1260RoHS Download Full productionN/A
 
Buy Now 		1K+$1.00reel
of
3000		SEDB
XTT
12 weeksN/A
LM3671MFX-1.5SOT-235NOPB1260RoHS Download Full productionN/A
 
Buy Now 		1K+$1.00reel
of
3000		SBRB
XTT
12 weeks7500
LM3671MFX-1.6SOT-235NOPB1260RoHS Download Full productionN/A
 
Buy Now 		1K+$1.00reel
of
3000		SDUB
XTT
6 weeks5000
LM3671MFX-1.8SOT-235NOPB1260RoHS Download Full productionN/A
 
Buy Now 		1K+$1.00reel
of
3000		SBSB
XTT
6 weeks7500
LM3671MFX-1.875SOT-235NOPB1260RoHS Download Full productionN/A
 
Buy Now 		1K+$1.00reel
of
3000		SDVB
XTT
6 weeks7500
LM3671MFX-2.5SOT-235NOPB1260RoHS Download Full productionN/A
 
Buy Now 		1K+$1.00reel
of
3000		SJRB
XTT
6 weeks5000
LM3671MFX-2.8SOT-235NOPB1260RoHS Download Full productionN/A
 
Buy Now 		1K+$1.00reel
of
3000		SJSB
XTT
6 weeks5000
LM3671MFX-3.3SOT-235NOPB1260RoHS Download Full productionN/A
 
Buy Now 		1K+$1.00reel
of
3000		SJEB
XTT
8 weeks15000
LM3671MFX-ADJSOT-235NOPB1260RoHS Download Full productionN/A
 
Buy Now 		1K+$1.00reel
of
3000		SBTB
XTT
6 weeks50000
LM3671LC-1.6EVLM3671LC-1.6 Evaluation BoardFull productionN/A
 
Buy Now 		1+$53.001-
6 weeksN/A
LM3671LC-1.8EVevaluation boardFull productionN/A
 1+$53.001-
6 weeksN/A
LM3671TL-1.2MICRO SMD5NOPB1260RoHS Download Full productionN/A
Samples
Buy Now 		1K+$0.85reel
of
250		XV
I C
12 weeksN/A
LM3671TL-1.5MICRO SMD5NOPB1260RoHS Download Full productionN/A
Samples
Buy Now 		1K+$0.85reel
of
250		XV
I D
6 weeksN/A
LM3671TL-1.8MICRO SMD5NOPB1260RoHS Download Full productionN/A
Samples
Buy Now 		1K+$0.85reel
of
250		XV
I B
6 weeksN/A
LM3671TL-1.875MICRO SMD5NOPB1260RoHS Download Full productionN/A
Samples
Buy Now 		1K+$0.85reel
of
250		XV
I S
6 weeksN/A
LM3671TL-2.5MICRO SMD5NOPB1260RoHS Download Full productionN/A
Samples
Buy Now 		1K+$0.85reel
of
250		XV
I L
6 weeksN/A
LM3671TL-2.8MICRO SMD5NOPB1260RoHS Download Full productionN/A
Samples
Buy Now 		1K+$0.85reel
of
250		XV
I K
6 weeksN/A
LM3671TL-3.3MICRO SMD5NOPB1260RoHS Download Full productionN/A
Samples
Buy Now 		1K+$0.85reel
of
250		XV
I J
6 weeksN/A
LM3671TL-ADJMICRO SMD5NOPB1260RoHS Download Full productionN/A
Samples
Buy Now 		1K+$0.85reel
of
250		XV
I E
6 weeksN/A
LM3671TLX-1.2MICRO SMD5NOPB1260RoHS Download Full productionN/A
 
Buy Now 		1K+$0.85reel
of
3000		XV
I C
12 weeksN/A
LM3671TLX-1.5MICRO SMD5NOPB1260RoHS Download Full productionN/A
 
Buy Now 		1K+$0.85reel
of
3000		XV
I D
6 weeksN/A
LM3671TLX-1.8MICRO SMD5NOPB1260RoHS Download Full productionN/A
 
Buy Now 		1K+$0.85reel
of
3000		XV
I B
6 weeksN/A
LM3671TLX-1.875MICRO SMD5NOPB1260RoHS Download Full productionN/A
 
Buy Now 		1K+$0.85reel
of
3000		XV
I S
6 weeksN/A
LM3671TLX-2.5MICRO SMD5NOPB1260RoHS Download Full productionN/A
 
Buy Now 		1K+$0.85reel
of
3000		XV
I L
6 weeksN/A
LM3671TLX-2.8MICRO SMD5NOPB1260RoHS Download Full productionN/A
 
Buy Now 		1K+$0.85reel
of
3000		XV
I K
6 weeksN/A
LM3671TLX-3.3MICRO SMD5NOPB1260RoHS Download Full productionN/A
 
Buy Now 		1K+$0.85reel
of
3000		XV
I J
6 weeksN/A
LM3671TLX-ADJMICRO SMD5NOPB1260RoHS Download Full productionN/A
 
Buy Now 		1K+$0.85reel
of
3000		XV
I E
6 weeksN/A

General Description

The LM3671 step-down DC-DC converter is optimized for powering low voltage circuits from a single Li-Ion cell battery and input voltage rails from 2.7V to 5.5V. It provides up to 600mA load current, over the entire input voltage range. There are several different fixed voltage output options available as well as an adjustable output voltage version range from 1.1V to 3.3V.

The device offers superior features and performance for mobile phones and similar portable systems. Automatic intelligent switching between PWM low-noise and PFM low-current mode offers improved system control. During PWM mode, the device operates at a fixed-frequency of 2 MHz (typ.). Hysteretic PFM mode extends the battery life by reducing the quiescent current to 16 µA (typ.) during light load and standby operation. Internal synchronous rectification provides high efficiency during PWM mode operation. In shutdown mode, the device turns off and reduces battery consumption to 0.01 µA (typ.).

The LM3671 is available in SOT23-5, tiny 5-bump micro SMD and a 6-pin LLP packages in leaded (PB) and lead-free (NO PB) versions. A high switching frequency of 2 MHz (typ.) allows use of tiny surface-mount components. Only three external surface-mount components, an inductor and two ceramic capacitors, are required.

Reliability Metrics

Part Number Process EFR Reject EFR Sample Size PPM LTA Rejects LTA Device Hours FITS MTTF (Hours)
LM3671LC-1.2CMOS70184060010890004309006723
LM3671LC-1.3CMOS70184060010890004309006723
LM3671LC-1.6CMOS70184060010890004309006723
LM3671LC-1.8CMOS70184060010890004309006723
LM3671LCX-1.2CMOS70184060010890004309006723
LM3671LCX-1.3CMOS70184060010890004309006723
LM3671LCX-1.6CMOS70184060010890004309006723
LM3671LCX-1.8CMOS70184060010890004309006723
LM3671MF-1.2CMOS70184060010890004309006723
LM3671MF-1.25CMOS70184060010890004309006723
LM3671MF-1.375CMOS70184060010890004309006723
LM3671MF-1.5CMOS70184060010890004309006723
LM3671MF-1.6CMOS70184060010890004309006723
LM3671MF-1.8CMOS70184060010890004309006723
LM3671MF-1.875CMOS70184060010890004309006723
LM3671MF-2.5CMOS70184060010890004309006723
LM3671MF-2.8CMOS70184060010890004309006723
LM3671MF-3.3CMOS70184060010890004309006723
LM3671MF-ADJCMOS70184060010890004309006723
LM3671MFX-1.2CMOS70184060010890004309006723
LM3671MFX-1.25CMOS70184060010890004309006723
LM3671MFX-1.375CMOS70184060010890004309006723
LM3671MFX-1.5CMOS70184060010890004309006723
LM3671MFX-1.6CMOS70184060010890004309006723
LM3671MFX-1.8CMOS70184060010890004309006723
LM3671MFX-1.875CMOS70184060010890004309006723
LM3671MFX-2.5CMOS70184060010890004309006723
LM3671MFX-2.8CMOS70184060010890004309006723
LM3671MFX-3.3CMOS70184060010890004309006723
LM3671MFX-ADJCMOS70184060010890004309006723
LM3671TL-1.2CMOS70184060010890004309006723
LM3671TL-1.5CMOS70184060010890004309006723
LM3671TL-1.8CMOS70184060010890004309006723
LM3671TL-1.875CMOS70184060010890004309006723
LM3671TL-2.5CMOS70184060010890004309006723
LM3671TL-2.8CMOS70184060010890004309006723
LM3671TL-3.3CMOS70184060010890004309006723
LM3671TL-ADJCMOS70184060010890004309006723
LM3671TLX-1.2CMOS70184060010890004309006723
LM3671TLX-1.5CMOS70184060010890004309006723
LM3671TLX-1.8CMOS70184060010890004309006723
LM3671TLX-1.875CMOS70184060010890004309006723
LM3671TLX-2.5CMOS70184060010890004309006723
LM3671TLX-2.8CMOS70184060010890004309006723
LM3671TLX-3.3CMOS70184060010890004309006723
LM3671TLX-ADJCMOS70184060010890004309006723

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 - Managing Power Consumption on Your Portable Applications Processor Design     View    

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Application Notes

TitleSize in Kbytes Date Click link below to Download
AN-1395: Application Note 1395 LM3671 Evaluation Board 3838
Kbytes		 10-Oct-08 Download
AN-1395 (Chinese): Application Note 1395 LM3671 Evaluation Board
 321 Kbytes  

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-1682: Application Note 1682 LM3679TL Evaluation Board 3720
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AN-1465: Application Note 1465 LM3673 Evaluation Board 3717
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AN-1465 (Chinese): Application Note 1465 LM3673 Evaluation Board
 269 Kbytes  
AN-1427: Application Note 1427 LM3674 Evaluation Board 4966
Kbytes		 14-Oct-08 Download
AN-1427 (Chinese): Application Note 1427 LM3674 Evaluation Board
 292 Kbytes  
AN-1595: Application Note 1595 LM3677 Evaluation Board 2801
Kbytes		 14-Oct-08 Download
AN-1536: Application Note 1536 LM3676 Evaluation Board 417
Kbytes		 14-Oct-08 Download
AN-1536 (Chinese): Application Note 1536 LM3676 Evaluation Board
 278 Kbytes  
AN-1722: Application Note 1722 LM3678 Evaluation Board 506
Kbytes		 14-Oct-08 Download
AN-1348: Application Note 1348 LM3670 Evaluation Board 3906
Kbytes		 9-Oct-08 Download
AN-1348 (Chinese): Application Note 1348 LM3670 Evaluation Board
 257 Kbytes  

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

[Information as of 7-Nov-2009]