LT3905 Boost Converter Overview
Description
LT3905 is a 2.60 V, 0.40 A switch current limit non-sync Boost Converter from . The input voltage from 2.70 V to 12.00 V can be boosted into an output voltage ranging from 2.60 V to 2.60 V.
Features of the Boost Converter are adjustable 2000 kHz switching frequency, a typical inductor size of 10.0 µH and it offers a peak efficiency of up to %. The minimum external component count is 11 and LT3905 is available in 1 package option(s): QFN-16 .
Feature and parameter overview with replacement search
For LT3905 replacement search, 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. | 2.70 V | |
V-IN max. | 12.00 V | |
Current-Limit typ.? | 0.40 A | |
V-OUT min. | 2.60 V | |
V-OUT max. | 2.60 V | |
VOUT | 2.60 | |
VOUT programmable | ![]() |
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sync/non-sync | non-sync | |
Frequency typ. | 2000 kHz | |
Frequency adjustable | adjustable | |
Frequency selectable | 1000/2000 kHz | |
Frequency adj. min. | ||
Frequency adj. max. | ||
extern clock sync. | ![]() |
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Softstart | ![]() |
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Softstart adjustable | ![]() |
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Tracking | ![]() |
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PG/Power OK | ![]() |
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LBI/LBO | ![]() |
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Frequency sync. min. | ||
Frequency sync. max. | ||
Down Mode | ![]() |
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Quiescent current max. | 24 µA | |
Operating min. | ||
Operating max. | ||
Junction min. | -40 °C | |
Junction max. | 125 °C | |
thermal shutdown typ. | 150 °C | |
Inductor size typ. | 10.0 µH | |
Inductor suggested by Würth Elektronik | ||
Automotive AEC-Q100 | ![]() |
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Light-Load-Mode | ![]() |
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Topology | Boost | |
Peak Efficiency | ||
Component count min. | 11 | |
current limit adjustable | ![]() |
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Nr.of package options | 1 | |
CSP | ||
SC70 | ||
SOT | ||
MSOP | ||
QFN/DFN | QFN-16 | |
SO/SOIC | ||
SOP | ||
DIP | ||
TO | ||
DDPAK |
LT3905 Datasheet
Link to the most up-to-date LT3905 datasheet and the product page for EVM, tools and support information.
LT3905 Price breaks and distributor sample stock
LT3905 prices and available online distributors.


Available Distributors with stock: 3
Chip One Stop (2)
Digi-Key (4)
Newark Electronics (1)
Available Distributors with stock: 4
Arrow Electronics
Product | Stock | Price | Buy | ||||
LT3905EUD#PBF | 17 |
| Buy Now | ||||
LT3905EUD#PBF | 0 |
| Buy Now | ||||
LT3905IUD#PBF | 0 |
| Buy Now | ||||
LT3905IUD#TRPBF | 0 |
| Buy Now | ||||
LT3905EUD#TRPBF | 0 |
| Buy Now |
Digi-Key
Product | Stock | Price | Buy | ||||||
LT3905IUD#TRPBF | 2500 |
| Buy Now | ||||||
LT3905EUD#PBF | 352 |
| Buy Now | ||||||
LT3905IUD#PBF | 200 |
| Buy Now | ||||||
DC1956A | 2 |
| Buy Now | ||||||
LT3905EUD#TRPBF | 0 |
| Buy Now |
Newark element14
Chip1Stop
Available Distributors without stock: 1
Mouser Electronics
Alternatives and equivalents
The following DC/DC Boost Converter are similar to LT3905. Optional, compare LT3905 side-by-side with other Boost Converter via the Comparison function.
Inductor suggestions
Below you can find matching inductors from Wuerth Elektronik calculated on the maximum parameters of LT3905.
Order Code | Spec | L (µH) | IR (A) | ISAT (A) | RDC (mΩ) | L x W x H (mm) |
74479762168 | 0.7 | 1.0 | 0.7 | 220.00 | 1.6 x 0.8 x 0.55 | |
74479763168 | 0.7 | 1.0 | 1.0 | 180.00 | 1.6 x 0.8 x 0.95 | |
74479773147 | 0.5 | 1.4 | 1.2 | 100.00 | 2 x 1.25 x 0.6 | |
74479773154 | 0.5 | 1.3 | 1.0 | 120.00 | 2 x 1.25 x 0.6 | |
74479774147 | 0.5 | 1.3 | 0.7 | 120.00 | 2 x 1.25 x 0.6 | |
74479775147A | 0.5 | 1.4 | 1.0 | 100.00 | 2 x 1.2 x 1.2 | |
74479787147B | 0.5 | 2.7 | 1.0 | 40.00 | 2.5 x 2 x 1 | |
74479897150 | 0.5 | 2.9 | 1.1 | 25.00 | 3.2 x 2.6 x 0.7 |