LTC3405A Buck Converter overview
Description
LTC3405A is a 5.50 V sync Buck Converter from with 0.30 A output current. The maximum 5.50 V input voltage can be regulated down into a 0.80 V to 5.50 V output voltage.
It requires are a typical inductor size of 4.70 µH, a typical external component count of 6 and achieves a peak efficiency of 96 %. Further LTC3405A characteristics are a fixed 1500 kHz switching frequency and 1 available package option(s): TSOT23 .
Parameter overview and features with replacement search
For the LTC3405A 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. | 2.50 V | |
V-IN max. | 5.50 V | |
I-OUT? | 0.30 A | |
V-OUT min. | 0.80 V | |
V-OUT max. | 5.50 V | |
V-OUT | adjustable V | |
V-OUT programmable | ![]() |
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sync/non-sync | sync | |
Frequency typ. | 1500 kHz | |
Frequency | fixed | |
Frequency selectable | ||
ext.clock sync. | ![]() |
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Frequency adj./ ext.clock min. | ||
Frequency adj./ ext.clock max | ||
Softstart | ![]() |
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Softstart adjustable | ![]() |
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Tracking | ![]() |
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PG/Power OK | ![]() |
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Quiescent current max. | 400 µA | |
Operating min. | -40 °C | |
Operating max. | 85 °C | |
Junction min. | ||
Junction max. | ||
thermal shutdown typ. | ||
Inductor size typ. | 4.70 µH | |
Inductor suggested by Würth Elektronik | ||
Automotive AEC-Q100 | ![]() |
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Light-Load-Mode | ![]() |
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Topology | Buck | |
Peak Efficiency | 96 % | |
Component count min. | 6 | |
current limit adjustable | ![]() |
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Nr.of packages | 1 | |
CSP | ||
SC70 | ||
SOT | TSOT23 | |
MSOP | ||
QFN/DFN | ||
SO/SOIC | ||
SOP | ||
DIP | ||
TO | ||
DDPAK |
LTC3405A Datasheet
Link to the most up-to-date LTC3405A datasheet and the product page for EVM, tools and support information.
LTC3405A Sample stock and distributor price breaks
LTC3405A 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 LTC3405A. Optional, compare LTC3405A 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 LTC3405A.
Order Code | Spec | L (µH) | IR (A) | ISAT (A) | RDC (mΩ) | L x W x H (mm) |
744028004 | 4.7 | 0.9 | 0.7 | 265.00 | 2.8 x 2.8 x 1.2 | |
744029004 | 4.7 | 1.0 | 0.8 | 170.00 | 2.8 x 2.8 x 1.5 | |
744030004 | 4.7 | 0.5 | 0.5 | 252.00 | 3.3 x 3.5 x 1.05 | |
74479887247A | 4.7 | 1.0 | 0.4 | 230.00 | 2.5 x 2 x 1 | |
74479888247 | 4.7 | 1.0 | 0.7 | 380.00 | 2.5 x 2 x 1 |