LTC3403 Buck Converter overview



LTC3403 is a 5.00 V sync Buck Converter from with 0.60 A output current. The maximum 5.00 V input voltage can be regulated down into a 0.30 V to 3.50 V output voltage.

It requires are a typical inductor size of 2.20 µH, a typical external component count of 3 and achieves a peak efficiency of 93 %. Further LTC3403 characteristics are a fixed 1500 kHz switching frequency and 1 available package option(s): DFN-8 .

For the LTC3403 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.

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V-IN min. 2.50 V
V-IN max. 5.00 V
I-OUT? 0.60 A
V-OUT min. 0.30 V
V-OUT max. 3.50 V
V-OUT adjustable V
V-OUT programmable yes
sync/non-sync sync
Frequency typ. 1500 kHz
Frequency fixed
Frequency selectable
ext.clock sync. no
Frequency adj./ ext.clock min.
Frequency adj./ ext.clock max
Softstart no
Softstart adjustable no
Tracking no
PG/Power OK no
Quiescent current max. 2500 µA
Operating min. -40 °C
Operating max. 85 °C
Junction min.
Junction max.
thermal shutdown typ.
Inductor size typ. 2.20 µH
Inductor suggested by Würth Elektronik
Automotive AEC-Q100 no
Light-Load-Mode yes
Topology Buck
Peak Efficiency 93 %
Component count min. 3
current limit adjustable no
Nr.of packages 1

LTC3403 Datasheet

Link to the most up-to-date LTC3403 datasheet and the product page for EVM, tools and support information.


LTC3403 Sample stock and distributor price breaks

LTC3403 prices and online available distributors.

Available Distributors with stock: 0

no online Distributor with LTC3403 stock available

Available Distributors with stock: 0

no online Distributor with LTC3403 stock available

List of equivalents and alternatives

The following DC/DC Buck Converter are similar to LTC3403. Optional, compare LTC3403 side-by-side with other Buck Converter via the Comparison function.

Variation Compare Product Manufacturer Package
10% MAX8506 MAX8506 product overviewMAX8506 product overview Maxim TQFN-16
10% MAX8507 MAX8507 product overviewMAX8507 product overview Maxim TQFN-16
10% MAX8581 MAX8581 product overviewMAX8581 product overview Maxim TDFN-EP-10
10% MAX8582 MAX8582 product overviewMAX8582 product overview Maxim TDFN-EP-10

Inductor suggestions

Below you can find matching inductors from Wuerth Elektronik calculated on the maximum parameters of LTC3403.

V-IN max. 5 V, I-OUT 0.6 A, V-OUT min. 0.3 V, Frequency typ. 1500 kHz
Order Code Spec L (µH) IR (A) ISAT (A) RDC (mΩ) L x W x H (mm)
744030001 1.2 1.0 1.1 95.00 3.3 x 3.5 x 1.05
744031001 1.5 1.8 1.6 40.00 3.8 x 3.8 x 1.8
74479775215 1.5 1.1 0.8 160.00 2 x 1.2 x 1.2
74479776215 1.5 1.3 0.8 110.00 2 x 1.6 x 1
74479787215A 1.5 1.9 1.1 70.00 2.5 x 2 x 1
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