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LM3671 -
2MHz, 600mA Step-Down DC-DC Converter from the PowerWise® Family
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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 |
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Typical Application
click for larger image
| Parameters | Values |
| 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
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WEBENCH Live Simulation!
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
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Datasheet
RoHS Compliance Information
| Size in Kbytes | Date |
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| LM3671 2MHz, 600mA Step-Down DC-DC Converter |
7467 Kbytes |
28-Oct-08 |
Download |
LM3671 2MHz, 600mA Step-Down DC-DC Converter (Japanese)
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2487 Kbytes |
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Package Availability, Models, Samples & Pricing
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) |
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LM3671LC-1.2 | CMOS7 | 0 | 18406 | 0 | 0 | 1089000 | 4 | 309006723
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LM3671LC-1.3 | CMOS7 | 0 | 18406 | 0 | 0 | 1089000 | 4 | 309006723
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LM3671LC-1.6 | CMOS7 | 0 | 18406 | 0 | 0 | 1089000 | 4 | 309006723
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LM3671LC-1.8 | CMOS7 | 0 | 18406 | 0 | 0 | 1089000 | 4 | 309006723
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LM3671LCX-1.2 | CMOS7 | 0 | 18406 | 0 | 0 | 1089000 | 4 | 309006723
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LM3671LCX-1.3 | CMOS7 | 0 | 18406 | 0 | 0 | 1089000 | 4 | 309006723
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LM3671LCX-1.6 | CMOS7 | 0 | 18406 | 0 | 0 | 1089000 | 4 | 309006723
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LM3671LCX-1.8 | CMOS7 | 0 | 18406 | 0 | 0 | 1089000 | 4 | 309006723
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LM3671MF-1.2 | CMOS7 | 0 | 18406 | 0 | 0 | 1089000 | 4 | 309006723
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LM3671MF-1.25 | CMOS7 | 0 | 18406 | 0 | 0 | 1089000 | 4 | 309006723
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LM3671MF-1.375 | CMOS7 | 0 | 18406 | 0 | 0 | 1089000 | 4 | 309006723
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LM3671MF-1.5 | CMOS7 | 0 | 18406 | 0 | 0 | 1089000 | 4 | 309006723
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LM3671MF-1.6 | CMOS7 | 0 | 18406 | 0 | 0 | 1089000 | 4 | 309006723
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LM3671MF-1.8 | CMOS7 | 0 | 18406 | 0 | 0 | 1089000 | 4 | 309006723
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LM3671MF-1.875 | CMOS7 | 0 | 18406 | 0 | 0 | 1089000 | 4 | 309006723
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LM3671MF-2.5 | CMOS7 | 0 | 18406 | 0 | 0 | 1089000 | 4 | 309006723
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LM3671MF-2.8 | CMOS7 | 0 | 18406 | 0 | 0 | 1089000 | 4 | 309006723
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LM3671MF-3.3 | CMOS7 | 0 | 18406 | 0 | 0 | 1089000 | 4 | 309006723
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LM3671MF-ADJ | CMOS7 | 0 | 18406 | 0 | 0 | 1089000 | 4 | 309006723
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LM3671MFX-1.2 | CMOS7 | 0 | 18406 | 0 | 0 | 1089000 | 4 | 309006723
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LM3671MFX-1.25 | CMOS7 | 0 | 18406 | 0 | 0 | 1089000 | 4 | 309006723
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LM3671MFX-1.375 | CMOS7 | 0 | 18406 | 0 | 0 | 1089000 | 4 | 309006723
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LM3671MFX-1.5 | CMOS7 | 0 | 18406 | 0 | 0 | 1089000 | 4 | 309006723
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LM3671MFX-1.6 | CMOS7 | 0 | 18406 | 0 | 0 | 1089000 | 4 | 309006723
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LM3671MFX-1.8 | CMOS7 | 0 | 18406 | 0 | 0 | 1089000 | 4 | 309006723
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LM3671MFX-1.875 | CMOS7 | 0 | 18406 | 0 | 0 | 1089000 | 4 | 309006723
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LM3671MFX-2.5 | CMOS7 | 0 | 18406 | 0 | 0 | 1089000 | 4 | 309006723
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LM3671MFX-2.8 | CMOS7 | 0 | 18406 | 0 | 0 | 1089000 | 4 | 309006723
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LM3671MFX-3.3 | CMOS7 | 0 | 18406 | 0 | 0 | 1089000 | 4 | 309006723
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LM3671MFX-ADJ | CMOS7 | 0 | 18406 | 0 | 0 | 1089000 | 4 | 309006723
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LM3671TL-1.2 | CMOS7 | 0 | 18406 | 0 | 0 | 1089000 | 4 | 309006723
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LM3671TL-1.5 | CMOS7 | 0 | 18406 | 0 | 0 | 1089000 | 4 | 309006723
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LM3671TL-1.8 | CMOS7 | 0 | 18406 | 0 | 0 | 1089000 | 4 | 309006723
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LM3671TL-1.875 | CMOS7 | 0 | 18406 | 0 | 0 | 1089000 | 4 | 309006723
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LM3671TL-2.5 | CMOS7 | 0 | 18406 | 0 | 0 | 1089000 | 4 | 309006723
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LM3671TL-2.8 | CMOS7 | 0 | 18406 | 0 | 0 | 1089000 | 4 | 309006723
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LM3671TL-3.3 | CMOS7 | 0 | 18406 | 0 | 0 | 1089000 | 4 | 309006723
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LM3671TL-ADJ | CMOS7 | 0 | 18406 | 0 | 0 | 1089000 | 4 | 309006723
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LM3671TLX-1.2 | CMOS7 | 0 | 18406 | 0 | 0 | 1089000 | 4 | 309006723
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LM3671TLX-1.5 | CMOS7 | 0 | 18406 | 0 | 0 | 1089000 | 4 | 309006723
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LM3671TLX-1.8 | CMOS7 | 0 | 18406 | 0 | 0 | 1089000 | 4 | 309006723
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LM3671TLX-1.875 | CMOS7 | 0 | 18406 | 0 | 0 | 1089000 | 4 | 309006723
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LM3671TLX-2.5 | CMOS7 | 0 | 18406 | 0 | 0 | 1089000 | 4 | 309006723
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LM3671TLX-2.8 | CMOS7 | 0 | 18406 | 0 | 0 | 1089000 | 4 | 309006723
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LM3671TLX-3.3 | CMOS7 | 0 | 18406 | 0 | 0 | 1089000 | 4 | 309006723
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LM3671TLX-ADJ | CMOS7 | 0 | 18406 | 0 | 0 | 1089000 | 4 | 309006723
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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
| Title | Size in Kbytes |
Date |
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| Article - Managing Power Consumption on Your Portable Applications Processor Design |
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View |
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Application Notes
| Title | Size in Kbytes |
Date |
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| AN-1395: Application Note 1395 LM3671 Evaluation Board |
3838 Kbytes |
10-Oct-08 |
Download |
AN-1395 (Chinese): Application Note 1395 LM3671 Evaluation Board
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321 Kbytes |
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AN-1427 (Chinese): Application Note 1427 LM3674 Evaluation Board
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| AN-1536: Application Note 1536 LM3676 Evaluation Board |
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AN-1348 (Chinese): Application Note 1348 LM3670 Evaluation Board
|
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[Information as of 7-Nov-2009]
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