Datasheet
RoHS Compliance Information
| Size in Kbytes | Date |
 |
| LM2745 / LM2748 Synchronous Buck Controller with Pre-Bias Startup, and Optional Clock Synchronization |
547
Kbytes |
20-Jan-09 |
Download |
Package Availability, Models, Samples & Pricing
General Description
The LM2745/8 are high-speed synchronous buck regulator controllers with an accurate feedback voltage accuracy of ±1.5%. It
can provide simple down conversion to output voltages as low as 0.6V. Though the control sections of the IC are rated for
3 to 6V, the driver sections are designed to accept input supply rails as high as 14V. The use of adaptive non-overlapping
MOSFET gate drivers helps avoid potential shoot-through problems while maintaining high efficiency. The IC is designed for
the more cost-effective option of driving only N-channel MOSFETs in both the high-side and low-side positions. It senses the
low-side switch voltage drop for providing a simple, adjustable current limit.
The LM2745/8 features a fixed-frequency voltage-mode PWM control architecture which is adjustable from 50 kHz to 1 MHz with
one external resistor. In addition, the LM2745 also allows the switching frequency to be synchronized to an external clock
signal over the range of 250 kHz to 1 MHz. This wide range of switching frequency gives the power supply designer the flexibility
to make better tradeoffs between component size, cost and efficiency.
Features include the ability to startup with a pre-biased load on the output, soft-start, input undervoltage lockout (UVLO)
and Power Good (based on both undervoltage and overvoltage detection). In addition, the shutdown pin of the IC can be used
for providing startup delay, and the soft-start pin can be used for implementing precise tracking, for the purpose of sequencing
with respect to an external rail.
Reliability Metrics
| Part Number |
Process |
EFR Reject |
EFR Sample Size |
PPM |
LTA Rejects |
LTA Device Hours |
FITS |
MTTF (Hours) |
|
LM2745MTC | ABCD150 | 0 | 34175 | 0 | 0 | 4234000 | 1 | 1201409060
|
|
LM2745MTCX | ABCD150 | 0 | 34175 | 0 | 0 | 4234000 | 1 | 1201409060
|
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 |
|
|
|
| Article - Exploit Controller Features to Optimize Power Designs |
|
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View |
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Application Notes
| Title | Size in Kbytes |
Date |
|
| AN-1573: Application Note 1573 LM2745-19A Demo Board |
2572
Kbytes |
17-May-07 |
Download |
| AN-1603: Application Note 1603 LM274X Reference Designs |
431
Kbytes |
6-Dec-07 |
Download |
AN-1603 (Chinese): Application Note 1603 LM274X Reference Designs
|
482 Kbytes |
|
 |
More Application Notes
| Title | Size in Kbytes |
Date |
|
| AN-1437: Application Note 1437 Current Limit Foldback Improves Short Circuit Protection in LM274X Family |
470
Kbytes |
25-May-06 |
Download |
AN-1437 (Chinese): Application Note 1437 Current Limit Foldback Improves Short Circuit Protection in LM274X Family
|
238 Kbytes |
|
|
| AN-1640: Application Note 1640 LM2743-19A Demo Board |
2570
Kbytes |
17-May-07 |
Download |
AN-1640 (Chinese): Application Note 1640 LM2743-19A Demo Board
|
535 Kbytes |
|
|
| AN-1641: Application Note 1641 LM2747-19A Demo Board |
2571
Kbytes |
17-May-07 |
Download |
| AN-1357: Application Note 1357 LM2744 Evaluation Board |
1794
Kbytes |
5-Oct-05 |
Download |
AN-1357 (Chinese): Application Note 1357 LM2744 Evaluation Board
|
388 Kbytes |
|
|
| AN-1325: Application Note 1325 LM2742 Evaluation Board |
607
Kbytes |
1-Apr-04 |
Download |
| AN-1449: Application Note 1449 LM2747 Evaluation Board |
594
Kbytes |
11-Apr-06 |
Download |
| AN-1385: Application Note 1385 LM2746 Evaluation Board |
1743
Kbytes |
1-Jun-05 |
Download |
AN-1385 (Chinese): Application Note 1385 LM2746 Evaluation Board
|
265 Kbytes |
|
|
| AN-1356: Application Note 1356 LM2743 Evaluation Board |
1785
Kbytes |
5-Oct-05 |
Download |
AN-1356 (Japanese): Application Note 1356 LM2743 Evaluation Board
 |
659 Kbytes |
|
 |
AN-1356 (Chinese): Application Note 1356 LM2743 Evaluation Board
|
298 Kbytes |
|
|
[Information as of 8-Nov-2009]
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