Datasheet
RoHS Compliance Information
| Size in Kbytes | Date |
 |
| LM22679 5A SIMPLE SWITCHER®, Step-Down Voltage Regulator with Adjustable Soft-Start and Current Limit |
350
Kbytes |
24-Nov-08 |
Download |
LM22679 5A SIMPLE SWITCHER®, Step-Down Voltage Regulator with Adjustable Soft-Start and Current Limit (Japanese)
 |
479 Kbytes |
|
 |
Package Availability, Models, Samples & Pricing
General Description
The LM22679 series of regulators are monolithic integrated circuits which provide all of the active functions for a step-down
(buck) switching regulator capable of driving up to 5A loads with excellent line and load regulation characteristics. High
efficiency (>90%) is obtained through the use of a low ON-resistance N-channel MOSFET. The series consists of a fixed 5V output
and an adjustable version.
The SIMPLE SWITCHER
® concept provides for an easy to use complete design using a minimum number of external components and National’s WEBENCH
® design tool. National’s WEBENCH
® tool includes features such as external component calculation, electrical simulation, thermal simulation, and Build-It boards
for easy design-in. The switching clock frequency is provided by an internal fixed frequency oscillator which operates at
500 kHz. The LM22679 series also has built in thermal shutdown and current limiting. The current limit threshold can be adjusted
using an external resistor. An adjustable soft-start feature is provided by selecting an appropriate external soft-start capacitor.
Reliability Metrics
| Part Number |
Process |
EFR Reject |
EFR Sample Size |
PPM |
LTA Rejects |
LTA Device Hours |
FITS |
MTTF (Hours) |
|
LM22679TJ-5.0 | ABCD5 | 0 | 5364 | 0 | 0 | 1626984 | 3 | 461661152
|
|
LM22679TJ-ADJ | ABCD5 | 0 | 5364 | 0 | 0 | 1626984 | 3 | 461661152
|
|
LM22679TJE-5.0 | ABCD5 | 0 | 5364 | 0 | 0 | 1626984 | 3 | 461661152
|
|
LM22679TJE-ADJ | ABCD5 | 0 | 5364 | 0 | 0 | 1626984 | 3 | 461661152
|
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 |
|
|
|
| "Downloadable LM2267x, LM22680 Quick Start Simple Switcher Component Calculator" |
1413 Kbytes |
12-Jan-2009 |
View |
|
|
Application Notes
| Title | Size in Kbytes |
Date |
|
| AN-1891: Application Note 1891 LM22679 Evaluation Board |
232
Kbytes |
14-Oct-08 |
Download |
| AN-1930: Application Note 1930 SIMPLE SWITCHER® Regulators Take Over Automotive Applications |
85
Kbytes |
7-Jan-09 |
Download |
| AN-1889: Application Note 1889 How to Measure the Loop Transfer Function of Power Supplies |
612
Kbytes |
14-Oct-08 |
Download |
More Application Notes
| Title | Size in Kbytes |
Date |
|
| AN-1888: Application Note 1888 LM22670 Evaluation Board Inverting Topology and Application Notes |
1020
Kbytes |
9-Jul-09 |
Download |
AN-1888 (Japanese): Application Note 1888 LM22670 Evaluation Board Inverting Topology and Application Notes
 |
566 Kbytes |
|
|
| AN-1895: Application Note 1895 LM22671 Evaluation Board |
249
Kbytes |
14-Oct-08 |
Download |
| AN-1896: Application Note 1896 LM22672 Evaluation Board |
258
Kbytes |
14-Oct-08 |
Download |
| AN-1894: Application Note 1894 LM22673 Evaluation Board |
255
Kbytes |
14-Oct-08 |
Download |
| AN-1892: Application Note 1892 LM22677 Evaluation Board |
237
Kbytes |
14-Oct-08 |
Download |
AN-1892 (Japanese): Application Note 1892 LM22677 Evaluation Board
|
287 Kbytes |
|
|
| AN-1885: Application Note 1885 LM22670 Evaluation Board |
499
Kbytes |
14-Oct-08 |
Download |
[Information as of 7-Nov-2009]
|
