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LM3674 -
2MHz, 600mA Step-Down DC-DC Converter in SOT 23-5 from the PowerWise® Family
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Features
| | 600mA max load current |
| | Input voltage range from 2.7V to 5.5V |
| | Available in fixed and adjustable output voltages ranging from 1.0V to 3.3V |
| | Operates from a single Li-Ion cell Battery |
| | Internal synchronous rectification for high efficiency |
| | Internal soft start |
| | 0.01 µA typical shutdown current |
| | 2 MHz PWM fixed switching frequency (typ) |
| | SOT23-5 package |
| | Current overload protection and Thermal shutdown protection |
General Description
The LM3674 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 |
| | Portable instruments |
| | W-LAN |
| | 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, 1.1, 1.875, 1.2, 2.8, 1.5 Volt |
| Output Max |
1.8, 1.875, 1.2, 3.3, 2.8, 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, 1.875, 1.2, 2.8, 1.5 Volt |
| Output Range |
Undefined |
| 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
| LM3670▲ | 1 MHz Switching Frequency, 350mA Output Current, W/O PWM Mode |
| LM3671▲ | 2 MHz Switching Frequency, 600mA Output Current, W/O PWM Mode |
Additional Resources
Application Notes

Block Diagram
click for larger image
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Datasheet
RoHS Compliance Information
| Size in Kbytes | Date |
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| LM3674 2MHz, 600mA Step-Down DC-DC Converter in SOT 23-5 |
1102 Kbytes |
13-Sep-06 |
Download |
LM3674 2MHz, 600mA Step-Down DC-DC Converter in SOT 23-5 (Japanese)
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1307 Kbytes |
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Package Availability, Models, Samples & Pricing
General Description
The LM3674 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 fixed output voltages and adjustable output voltage versions.
The device offers superior features and performance for mobile phones and similar portable systems. During PWM mode, the device operates at a fixed-frequency of 2 MHz (typ). 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 LM3674 is available in SOT23-5 in leaded (PB) and lead-free (NO PB) versions. A high switching frequency of 2 MHz (typ) allows use of only three tiny external surface-mount components, an inductor and two ceramic capacitors.
Reliability Metrics
| Part Number |
Process |
EFR Reject |
EFR Sample Size |
PPM |
LTA Rejects |
LTA Device Hours |
FITS |
MTTF (Hours) |
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LM3674MF-1.2 | CMOS7 | 0 | 18406 | 0 | 0 | 1089000 | 4 | 309006723
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LM3674MF-1.5 | CMOS7 | 0 | 18406 | 0 | 0 | 1089000 | 4 | 309006723
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LM3674MF-1.8 | CMOS7 | 0 | 18406 | 0 | 0 | 1089000 | 4 | 309006723
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LM3674MF-1.875 | CMOS7 | 0 | 18406 | 0 | 0 | 1089000 | 4 | 309006723
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LM3674MF-2.8 | CMOS7 | 0 | 18406 | 0 | 0 | 1089000 | 4 | 309006723
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LM3674MF-ADJ | CMOS7 | 0 | 18406 | 0 | 0 | 1089000 | 4 | 309006723
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LM3674MFX-1.2 | CMOS7 | 0 | 18406 | 0 | 0 | 1089000 | 4 | 309006723
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LM3674MFX-1.5 | CMOS7 | 0 | 18406 | 0 | 0 | 1089000 | 4 | 309006723
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LM3674MFX-1.8 | CMOS7 | 0 | 18406 | 0 | 0 | 1089000 | 4 | 309006723
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LM3674MFX-1.875 | CMOS7 | 0 | 18406 | 0 | 0 | 1089000 | 4 | 309006723
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LM3674MFX-2.8 | CMOS7 | 0 | 18406 | 0 | 0 | 1089000 | 4 | 309006723
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LM3674MFX-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.
Application Notes
| Title | Size in Kbytes |
Date |
 |
| AN-1427: Application Note 1427 LM3674 Evaluation Board |
4966 Kbytes |
14-Oct-08 |
Download |
AN-1427 (Chinese): Application Note 1427 LM3674 Evaluation Board
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292 Kbytes |
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3720 Kbytes |
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10-Oct-08 |
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AN-1395 (Chinese): Application Note 1395 LM3671 Evaluation Board
|
321 Kbytes |
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| AN-1465: Application Note 1465 LM3673 Evaluation Board |
3717 Kbytes |
10-Oct-08 |
Download |
AN-1465 (Chinese): Application Note 1465 LM3673 Evaluation Board
|
269 Kbytes |
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| 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 |
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| AN-1722: Application Note 1722 LM3678 Evaluation Board |
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| AN-1348: Application Note 1348 LM3670 Evaluation Board |
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AN-1348 (Chinese): Application Note 1348 LM3670 Evaluation Board
|
257 Kbytes |
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[Information as of 7-Nov-2009]
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