LT3581 Boost Converter Overview



LT3581 is a 42.00 V, 4.30 A switch current limit non-sync Boost Converter from . The input voltage from 2.50 V to 22.00 V  can be boosted into an output voltage ranging from 3.70 V to 42.00 V.

Features of the Boost Converter are adjustable 2500 kHz switching frequency, a typical inductor size of 1.5 µH and it offers a peak efficiency of  up to 88 %. The minimum external component count is 17 and LT3581 is available in 2 package option(s): MSOP-16 DFN-14 .

For LT3581 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.

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V-IN min. 2.50 V
V-IN max. 22.00 V
Current-Limit typ.? 4.30 A
V-OUT min. 3.70 V
V-OUT max. 42.00 V
VOUT adjustable
VOUT programmable no
sync/non-sync non-sync
Frequency typ. 2500 kHz
Frequency adjustable adjustable
Frequency selectable
Frequency adj. min. 200 kHz
Frequency adj. max. 2500 kHz
extern clock sync. yes
Softstart yes
Softstart adjustable yes
Tracking no
PG/Power OK no
Frequency sync. min. 200 kHz
Frequency sync. max. 2500 kHz
Down Mode no
Quiescent current max. 2300 µA
Operating min.
Operating max.
Junction min. -40 °C
Junction max. 125 °C
thermal shutdown typ.
Inductor size typ. 1.5 µH
Inductor suggested by Würth Elektronik
Automotive AEC-Q100 no
Light-Load-Mode no
Topology Boost
Peak Efficiency 88 %
Component count min. 17
current limit adjustable no
Nr.of package options 2

LT3581 Datasheet

Link to the most up-to-date LT3581 datasheet and the product page for EVM, tools and support information.


LT3581 Price breaks and distributor sample stock

LT3581 prices and available online distributors.

Available Distributors with stock: 0

no online Distributor with LT3581 stock available

Available Distributors with stock: 0

no online Distributor with LT3581 stock available

Alternatives and equivalents

The following DC/DC Boost Converter are similar to LT3581. Optional, compare LT3581 side-by-side with other Boost Converter via the Comparison function.

Variation Compare Product Manufacturer Package
0% LT3579 LT3579 product overviewLT3579 product overview Linear Technology QFN-20, TSSOP-20
10% LT3959 LT3959 product overviewLT3959 product overview Linear Technology QFN-36
25% LT3957 LT3957 product overviewLT3957 product overview Linear Technology QFN-36
25% LT3957A LT3957A product overviewLT3957A product overview Linear Technology QFN-36
25% TPS61175 TPS61175 product overviewTPS61175 product overview Texas Instruments HTSSOP-14
25% TPS61175-Q1 TPS61175-Q1 product overviewTPS61175-Q1 product overview Texas Instruments HTSSOP-14
50% LT3580 LT3580 product overviewLT3580 product overview Linear Technology MSOP-8, DFN-8

Inductor suggestions

Below you can find matching inductors from Wuerth Elektronik calculated on the maximum parameters of LT3581.

V-IN min. 2.5 V, Current-Limit typ. 4.3 A, V-OUT max. 42 V, Frequency typ. 2500 kHz
Order Code Spec L (µH) IR (A) ISAT (A) RDC (mΩ) L x W x H (mm)
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