LT3973-3.3 Buck Converter overview
Description
LT3973-3.3 is a 42.00 V sync Buck Converter from with 0.75 A output current. The maximum 42.00 V input voltage can be regulated down into a 3.30 V to 3.30 V output voltage.
It requires are a typical inductor size of 15.00 µH, a typical external component count of 6 and achieves a peak efficiency of 88 %. Further LT3973-3.3 characteristics are a adjustable 800 kHz switching frequency and 2 available package option(s): MSOP-10 DFN-10 .
Parameter overview and features with replacement search
For the LT3973-3.3 replacement search, please select a main parameter tolerance value and adjust the checkboxes for feature match. The product counter within the button shows the number of available equivalents and a click on the replacement button shows all possible replacements within a parametric overview.
| Parameter | Value | Replacement Search Filter |
| V-IN min. | 4.20 V | |
| V-IN max. | 42.00 V | |
| I-OUT? | 0.75 A | |
| V-OUT min. | 3.30 V | |
| V-OUT max. | 3.30 V | |
| V-OUT | 3.300 V | |
| V-OUT programmable |  |
|
| sync/non-sync | sync | |
| Frequency typ. | 800 kHz | |
| Frequency | adjustable | |
| Frequency selectable | ||
| ext.clock sync. | |
|
| Frequency adj./ ext.clock min. | 195 kHz | |
| Frequency adj./ ext.clock max | 2150 kHz | |
| Softstart | |
|
| Softstart adjustable | |
|
| Tracking | |
|
| PG/Power OK |  |
|
| Quiescent current max. | 6 µA | |
| Operating min. | ||
| Operating max. | ||
| Junction min. | -40 °C | |
| Junction max. | 125 °C | |
| thermal shutdown typ. | ||
| Inductor size typ. | 15.00 µH | |
| Inductor suggested by Würth Elektronik | ||
| Automotive AEC-Q100 | |
|
| Light-Load-Mode | |
|
| Topology | Buck | |
| Peak Efficiency | 88 % | |
| Component count min. | 6 | |
| current limit adjustable | |
|
| Nr.of packages | 2 | |
| CSP | ||
| SC70 | ||
| SOT | ||
| MSOP | MSOP-10 | |
| QFN/DFN | DFN-10 | |
| SO/SOIC | ||
| SOP | ||
| DIP | ||
| TO | ||
| DDPAK |
LT3973-3.3 Datasheet
Link to the most up-to-date LT3973-3.3 datasheet and the product page for EVM, tools and support information.
LT3973-3.3 Sample stock and distributor price breaks
LT3973-3.3 prices and online available distributors.
Available Distributors with stock: 0
Available Distributors with stock: 0
List of equivalents and alternatives
The following DC/DC Buck Converter are similar to LT3973-3.3. Optional, compare LT3973-3.3 side-by-side with other Buck Converter via the Comparison function.
Inductor suggestions
Below you can find matching inductors from Wuerth Elektronik calculated on the maximum parameters of LT3973-3.3.
| Order Code | Spec | L (µH) | IR (A) | ISAT (A) | RDC (mΩ) | L x W x H (mm) |
| 744025100 | 10.0 | 1.0 | 1.1 | 170.00 | 2.8 x 2.8 x 3 | |
| 74404032100 | 10.0 | 0.8 | 0.9 | 230.00 | 3 x 3 x 1.5 | |
| 74404041100 | 10.0 | 1.3 | 1.0 | 168.00 | 4 x 4 x 1.2 | |
| 74404042100 | 10.0 | 1.2 | 1.5 | 150.00 | 4 x 4 x 1.8 | |
| 74404042150 | 15.0 | 0.9 | 1.2 | 210.00 | 4 x 4 x 1.8 | |
| 744042100 | 10.0 | 1.3 | 1.0 | 120.00 | 4.8 x 4.8 x 2 | |
| 744042120 | 12.0 | 1.2 | 1.0 | 150.00 | 4.8 x 4.8 x 2 | |
| 744043100 | 10.0 | 1.2 | 1.0 | 95.00 | 4.8 x 4.8 x 3 | |
| 744043120 | 12.0 | 1.1 | 1.0 | 100.00 | 4.8 x 4.8 x 3 | |
| 744045100 | 10.0 | 1.0 | 1.5 | 240.00 | 4.5 x 3.2 x 2.9 | |
| 744045120 | 12.0 | 0.8 | 1.4 | 336.00 | 4.5 x 3.2 x 2.9 | |
| 744052100 | 10.0 | 1.1 | 1.3 | 105.00 | 5.8 x 5.8 x 2 | |
| 744052120 | 12.0 | 1.0 | 1.2 | 130.00 | 5.8 x 5.8 x 2 | |
| 744052150 | 15.0 | 1.0 | 1.1 | 175.00 | 5.8 x 5.8 x 2 | |
| 744053100 | 10.0 | 1.5 | 1.4 | 60.00 | 5.8 x 5.8 x 3 | |
| 744053120 | 12.0 | 1.5 | 1.3 | 70.00 | 5.8 x 5.8 x 3 | |
| 744053150 | 15.0 | 1.4 | 1.2 | 80.00 | 5.8 x 5.8 x 3 | |
| 744062100 | 10.0 | 1.6 | 1.4 | 53.00 | 6.8 x 6.8 x 2.5 | |
| 744062120 | 12.0 | 1.4 | 1.3 | 70.00 | 6.8 x 6.8 x 2.5 | |
| 744062150 | 15.0 | 1.3 | 1.1 | 80.00 | 6.8 x 6.8 x 2.5 | |
| 7440680100 | 10.0 | 1.2 | 1.0 | 177.00 | 8 x 8 x 1.2 | |
| 7440680120 | 12.0 | 1.2 | 1.0 | 195.00 | 8 x 8 x 1.2 | |
| 7440690100 | 10.0 | 1.6 | 1.3 | 112.00 | 8 x 8 x 1.5 | |
| 7440690120 | 12.0 | 1.4 | 1.2 | 148.00 | 8 x 8 x 1.5 | |
| 7440690150 | 15.0 | 1.3 | 1.1 | 179.00 | 8 x 8 x 1.5 | |
| 7440700100 | 10.0 | 2.0 | 1.6 | 78.00 | 8 x 8 x 2 | |
| 7440700150 | 15.0 | 1.7 | 1.3 | 117.00 | 8 x 8 x 2 | |
| 74408941100 | 10.0 | 0.9 | 1.6 | 248.00 | 4.8 x 4.8 x 2.1 | |
| 74408941150 | 15.0 | 0.8 | 1.4 | 430.00 | 4.8 x 4.8 x 2.1 | |
| 74408942150 | 15.0 | 1.1 | 1.6 | 207.00 | 4.8 x 4.8 x 3.1 | |
| 74408943150 | 15.0 | 1.4 | 1.7 | 118.00 | 4.8 x 4.8 x 4.1 | |
| 74477310 | 10.0 | 1.5 | 1.7 | 118.00 | 4 x 4.5 x 3.5 | |
| 744773112 | 12.0 | 1.3 | 1.6 | 156.00 | 4 x 4.5 x 3.5 | |
| 744773115 | 15.0 | 1.2 | 1.5 | 204.00 | 4 x 4.5 x 3.5 | |
| 744778115 | 15.0 | 1.5 | 1.8 | 100.00 | 7.3 x 7.3 x 3.4 | |
| 744778510 | 10.0 | 1.9 | 1.6 | 100.00 | 5.9 x 6.2 x 3.3 | |
| 7447785115 | 15.0 | 1.6 | 1.4 | 165.00 | 5.9 x 6.2 x 3.3 | |
| 744778610 | 10.0 | 2.1 | 1.8 | 74.00 | 5.9 x 6.2 x 5.1 | |
| 7447789115 | 15.0 | 1.5 | 1.8 | 100.00 | 7.3 x 7.3 x 3.5 | |
| 78477310 | 10.0 | 1.5 | 1.7 | 118.00 | 4 x 4.5 x 3.5 | |
| 784773112 | 12.0 | 1.3 | 1.6 | 156.00 | 4 x 4.5 x 3.5 | |
| 784773115 | 15.0 | 1.2 | 1.5 | 204.00 | 4 x 4.5 x 3.5 |
