LTC3549 Buck Converter overview
Description
LTC3549 is a 5.50 V sync Buck Converter from with 0.25 A output current. The maximum 5.50 V input voltage can be regulated down into a 0.60 V to 5.00 V output voltage.
It requires are a typical inductor size of 3.30 µH, a typical external component count of 6 and achieves a peak efficiency of 93 %. Further LTC3549 characteristics are a fixed 2250 kHz switching frequency and 1 available package option(s): DFN-6 .
Parameter overview and features with replacement search
For the LTC3549 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. | 1.60 V | |
| V-IN max. | 5.50 V | |
| I-OUT? | 0.25 A | |
| V-OUT min. | 0.60 V | |
| V-OUT max. | 5.00 V | |
| V-OUT | adjustable V | |
| V-OUT programmable |  |
|
| sync/non-sync | sync | |
| Frequency typ. | 2250 kHz | |
| Frequency | fixed | |
| Frequency selectable | ||
| ext.clock sync. | |
|
| Frequency adj./ ext.clock min. | ||
| Frequency adj./ ext.clock max | ||
| Softstart |  |
|
| Softstart adjustable | |
|
| Tracking | |
|
| PG/Power OK | |
|
| Quiescent current max. | 475 µA | |
| Operating min. | -40 °C | |
| Operating max. | 85 °C | |
| Junction min. | ||
| Junction max. | ||
| thermal shutdown typ. | 150 °C | |
| Inductor size typ. | 3.30 µH | |
| Inductor suggested by Würth Elektronik | ||
| Automotive AEC-Q100 | |
|
| Light-Load-Mode | |
|
| Topology | Buck | |
| Peak Efficiency | 93 % | |
| Component count min. | 6 | |
| current limit adjustable | |
|
| Nr.of packages | 1 | |
| CSP | ||
| SC70 | ||
| SOT | ||
| MSOP | ||
| QFN/DFN | DFN-6 | |
| SO/SOIC | ||
| SOP | ||
| DIP | ||
| TO | ||
| DDPAK |
LTC3549 Datasheet
Link to the most up-to-date LTC3549 datasheet and the product page for EVM, tools and support information.
LTC3549 Sample stock and distributor price breaks
LTC3549 prices and online available distributors.
Available Distributors with stock: 6
Chip-One-Stop (2)
DIGI-KEY (2)
Element14 (2)
FARNELL-ELEMENT14 (2)
NEWARK (1)
RS-COMPONENTS (2)
Available Distributors with stock: 0
List of equivalents and alternatives
The following DC/DC Buck Converter are similar to LTC3549. Optional, compare LTC3549 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 LTC3549.
| Order Code | Spec | L (µH) | IR (A) | ISAT (A) | RDC (mΩ) | L x W x H (mm) |
| 74479776233A | 3.3 | 1.3 | 0.3 | 120.00 | 2 x 1.6 x 1 | |
| 74479787233A | 3.3 | 1.6 | 0.4 | 100.00 | 2.5 x 2 x 1 | |
| 74479887233A | 3.3 | 1.2 | 0.6 | 180.00 | 2.5 x 2 x 1 |
