Datasheet
RoHS Compliance Information
| Size in Kbytes | Date |
 |
| LM2671 SIMPLE SWITCHER Power Converter High Efficiency 500mA Step-Down Voltage Regulator with Features |
620 Kbytes |
5-Apr-07 |
Download |
LM2671 SIMPLE SWITCHER Power Converter High Efficiency 500mA Step-Down Voltage Regulator with Features (Japanese)
 |
1113 Kbytes |
|
 |
Package Availability, Models, Samples & Pricing
| Obsolete Part | Alternate Part or
Supplier | Source | Last Time Buy Date |
LM2671LD-12
| NONE
| NATIONAL SEMICONDUCTOR
| 16 Nov 2008
|
LM2671LD-3.3
| NONE
| NATIONAL SEMICONDUCTOR
| 16 Nov 2008
|
LM2671LD-5.0
| NONE
| NATIONAL SEMICONDUCTOR
| 16 Nov 2008
|
LM2671LDX-12
| NONE
| NATIONAL SEMICONDUCTOR
| 16 Nov 2008
|
LM2671LDX-3.3
| NONE
| NATIONAL SEMICONDUCTOR
| 16 Nov 2008
|
LM2671LDX-5.0
| NONE
| NATIONAL SEMICONDUCTOR
| 16 Nov 2008
|
LM2671LDX-ADJ
| NONE
| NATIONAL SEMICONDUCTOR
| 16 Nov 2008
|
General Description
The LM2671 series of regulators are monolithic integrated circuits built with a LMDMOS process. These regulators provide all
the active functions for a step-down (buck) switching regulator, capable of driving a 500mA load current with excellent line
and load regulation. These devices are available in fixed output voltages of 3.3V, 5.0V, 12V, and an adjustable output version.
Requiring a minimum number of external components, these regulators are simple to use and include patented internal frequency
compensation (Patent Nos. 5,382,918 and 5,514,947), fixed frequency oscillator, external shutdown, soft-start, and frequency
synchronization.
The LM2671 series operates at a switching frequency of
260 kHz, thus allowing smaller sized filter components than what would be needed with lower frequency switching regulators. Because
of its very high efficiency (>90%), the copper traces on the printed circuit board are the only heat sinking needed.
A family of standard inductors for use with the LM2671 are available from several different manufacturers. This feature greatly
simplifies the design of switch-mode power supplies using these advanced ICs. Also included in the datasheet are selector
guides for diodes and capacitors designed to work in switch-mode power supplies.
Other features include a guaranteed ±1.5% tolerance on output voltage within specified input voltages and output load conditions,
and ±10% on the oscillator frequency. External shutdown is included, featuring typically 50 μA stand-by current. The output
switch includes current limiting, as well as thermal shutdown for full protection under fault conditions.
To simplify the LM2671 buck regulator design procedure, there exists computer design software,
LM267X Made Simple
(version 6.0).
Reliability Metrics
| Part Number |
Process |
EFR Reject |
EFR Sample Size |
PPM |
LTA Rejects |
LTA Device Hours |
FITS |
MTTF (Hours) |
|
LM2671LD-12 | LMDMOS | 0 | 16810 | 0 | 0 | 2200000 | 2 | 624256007
|
|
LM2671LD-5.0 | LMDMOS | 0 | 16810 | 0 | 0 | 2200000 | 2 | 624256007
|
|
LM2671LD-ADJ | LMDMOS | 0 | 16810 | 0 | 0 | 2200000 | 2 | 624256007
|
|
LM2671M-12 | LMDMOS | 0 | 16810 | 0 | 0 | 2200000 | 2 | 624256007
|
|
LM2671M-3.3 | LMDMOS | 0 | 16810 | 0 | 0 | 2200000 | 2 | 624256007
|
|
LM2671M-5.0 | LMDMOS | 0 | 16810 | 0 | 0 | 2200000 | 2 | 624256007
|
|
LM2671M-ADJ | LMDMOS | 0 | 16810 | 0 | 0 | 2200000 | 2 | 624256007
|
|
LM2671MX-12 | LMDMOS | 0 | 16810 | 0 | 0 | 2200000 | 2 | 624256007
|
|
LM2671MX-3.3 | LMDMOS | 0 | 16810 | 0 | 0 | 2200000 | 2 | 624256007
|
|
LM2671MX-5.0 | LMDMOS | 0 | 16810 | 0 | 0 | 2200000 | 2 | 624256007
|
|
LM2671MX-ADJ | LMDMOS | 0 | 16810 | 0 | 0 | 2200000 | 2 | 624256007
|
|
LM2671N-12 | LMDMOS | 0 | 16810 | 0 | 0 | 2200000 | 2 | 624256007
|
|
LM2671N-3.3 | LMDMOS | 0 | 16810 | 0 | 0 | 2200000 | 2 | 624256007
|
|
LM2671N-5.0 | LMDMOS | 0 | 16810 | 0 | 0 | 2200000 | 2 | 624256007
|
|
LM2671N-ADJ | LMDMOS | 0 | 16810 | 0 | 0 | 2200000 | 2 | 624256007
|
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 |
|
|
|
| SimpleSwitcher® DC-DC Converters Design Software |
|
|
View |
|
|
| Power Reference Design Library |
0 Kbytes |
28-Mar-2006 |
View |
|
|
Reference Designs
Application Notes
| Title | Size in Kbytes |
Date |
|
| AN-1061: Application Note 1061 Power Conversion in Line-Powered Equipment |
162 Kbytes |
1-Oct-02 |
Download |
AN-1061 (Japanese): Application Note 1061 Power Conversion in Line-Powered Equipment
 |
215 Kbytes |
|
|
More Application Notes
| Title | Size in Kbytes |
Date |
|
| AN-1135: Application Note 1135 LM267X 3A, 5A Evaluation Boards |
1208 Kbytes |
10-May-04 |
Download |
| AN-1157: Application Note 1157 Positive to Negative Buck‐Boost Converter Using LM267X SIMPLE SWITCHER® Regulators |
189 Kbytes |
1-May-04 |
Download |
AN-1157 (Japanese): Application Note 1157 Positive to Negative Buck‐Boost Converter Using LM267X SIMPLE SWITCHER® Regulators
|
193 Kbytes |
|
|
AN-1157 (Chinese): Application Note 1157 Positive to Negative Buck‐Boost Converter Using LM267X SIMPLE SWITCHER® Regulators
|
307 Kbytes |
|
 |
| AN-1120: Application Note 1120 LM2675-5.0EVAL 1 Amp Step-Down High-Efficiency SIMPLE SWITCHER Evaluation Board |
44 Kbytes |
4-Oct-04 |
Download |
| AN-1229: Application Note 1229 SIMPLE SWITCHER PCB Layout Guidelines |
229 Kbytes |
1-May-04 |
Download |
AN-1229 (Japanese): Application Note 1229 SIMPLE SWITCHER PCB Layout Guidelines
|
304 Kbytes |
|
|
AN-1229 (Chinese): Application Note 1229 SIMPLE SWITCHER PCB Layout Guidelines
|
668 Kbytes |
|
|
[Information as of 3-Jul-2009]
|
