LT3681 Buck Converter overview

Description

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Sub-Category

LT3681 is a 34.00 V non-sync Buck Converter from with 2.00 A output current. The maximum 34.00 V input voltage can be regulated down into a 1.27 V to 20.00 V output voltage.

It requires are a typical inductor size of 6.80 µH, a typical external component count of 9 and achieves a peak efficiency of 90 %. Further LT3681 characteristics are a adjustable 2800 kHz switching frequency and 1 available package option(s): DFN-14 .

For the LT3681 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.

ParameterValueReplacement
Search Filter
V-IN min. 3.60 V
V-IN max. 34.00 V
I-OUT? 2.00 A
V-OUT min. 1.27 V
V-OUT max. 20.00 V
V-OUT adjustable V
V-OUT programmable no
sync/non-sync non-sync
Frequency typ. 2800 kHz
Frequency adjustable
Frequency selectable
ext.clock sync. no
Frequency adj./ ext.clock min. 300 kHz
Frequency adj./ ext.clock max 2800 kHz
Softstart yes
Softstart adjustable yes
Tracking no
PG/Power OK yes
Quiescent current max. 60 µA
Operating min. -40 °C
Operating max. 85 °C
Junction min.
Junction max.
thermal shutdown typ.
Inductor size typ. 6.80 µH
Inductor suggested by Würth Elektronik
Automotive AEC-Q100 no
Light-Load-Mode yes
Topology Buck
Peak Efficiency 90 %
Component count min. 9
current limit adjustable no
Nr.of packages 1
CSP
SC70
SOT
MSOP
QFN/DFN DFN-14
SO/SOIC
SOP
DIP
TO
DDPAK

LT3681 Datasheet

Link to the most up-to-date LT3681 datasheet and the product page for EVM, tools and support information.

LT3681

LT3681 Sample stock and distributor price breaks

LT3681 prices and online available distributors.

OEMSecrets.com
findchips.com

Available Distributors with stock: 5

ARROW-NAC (1)

ProductStockPriceBuy
LT3681EDE#PBF942
15.21 USD
1004.29 USD
Buy Now

Chip-One-Stop (2)

ProductStockPriceBuy
LT3681EDE#PBF604
18.22 USD
57.02 USD
106.86 USD
506.46 USD
1006.09 USD
2005.95 USD
Buy Now
LT3681EDE#TRPBF60
25004.84 USD
Buy Now

DIGI-KEY (1)

ProductStockPriceBuy
LT3681EDE#PBF1018
17.34 USD
255.21 USD
1004.29 USD
Buy Now
LT3681EDE#TRPBF0
25004.39 USD
Buy Now

FARNELL-ELEMENT14 (1)

ProductStockPriceBuy
LT3681EDE#PBF5Buy Now

NEWARK (1)

ProductStockPriceBuy
LT3681EDE#PBF100
17.34 USD
254.98 USD
1004.29 USD
Buy Now
LT3681EDE#TRPBF0
17.56 USD
25005.42 USD
Buy Now

Available Distributors without stock: 1

Element14 (0)

ProductStockPriceBuy
LT3681EDE#PBF0
111.73 USD
258.33 USD
1006.86 USD
Buy Now

Available Distributors with stock: 0

no online Distributor with LT3681 stock available

List of equivalents and alternatives

The following DC/DC Buck Converter are similar to LT3681. Optional, compare LT3681 side-by-side with other Buck Converter via the Comparison function.

Variation Compare Product Manufacturer Package
0% A8582 A8582 product overviewA8582 product overview Allegro TSSOP-16
0% A8583 A8583 product overviewA8583 product overview Allegro TSSOP-16
0% A8584 A8584 product overviewA8584 product overview Allegro TSSOP-16
0% LT3480 LT3480 product overviewLT3480 product overview Linear Technology DFN-10, MSOP-10
0% LT3481 LT3481 product overviewLT3481 product overview Linear Technology DFN-10, MSOP-10
0% LT3975 LT3975 product overviewLT3975 product overview Linear Technology MSOP-16
0% LT3980 LT3980 product overviewLT3980 product overview Linear Technology DFN-14, MSOP-16
0% LM26003 LM26003 product overviewLM26003 product overview Texas Instruments HTSSOP-20
0% LM26003-Q1 LM26003-Q1 product overviewLM26003-Q1 product overview Texas Instruments HTSSOP-20
0% TPS54240 TPS54240 product overviewTPS54240 product overview Texas Instruments SON-10, MSOP-10
0% TPS54240-Q1 TPS54240-Q1 product overviewTPS54240-Q1 product overview Texas Instruments SON-10, MSOP-10
0% TPS54262-Q1 TPS54262-Q1 product overviewTPS54262-Q1 product overview Texas Instruments HTSSOP-20
0% TPS54362-Q1 TPS54362-Q1 product overviewTPS54362-Q1 product overview Texas Instruments HTSSOP-20
0% TPS54361 TPS54361 product overviewTPS54361 product overview Texas Instruments WSON-10
0% TPS54361-Q1 TPS54361-Q1 product overviewTPS54361-Q1 product overview Texas Instruments WSON-10
25% LM26001 LM26001 product overviewLM26001 product overview Texas Instruments HTSSOP-16
25% LM26001-Q1 LM26001-Q1 product overviewLM26001-Q1 product overview Texas Instruments HTSSOP-16
25% TPS54140A TPS54140A product overviewTPS54140A product overview Texas Instruments SON-10, MSOP-10
50% LT3682 LT3682 product overviewLT3682 product overview Linear Technology DFN-12
50% LT3971 LT3971 product overviewLT3971 product overview Linear Technology DFN-10, MSOP-10
50% LT3971A LT3971A product overviewLT3971A product overview Linear Technology MSOP-8
50% LT3991 LT3991 product overviewLT3991 product overview Linear Technology DFN-10, MSOP-10
50% LM26001B LM26001B product overviewLM26001B product overview Texas Instruments HTSSOP-16
50% TPS54162-Q1 TPS54162-Q1 product overviewTPS54162-Q1 product overview Texas Instruments HTSSOP-20
50% TPS57160-Q1 TPS57160-Q1 product overviewTPS57160-Q1 product overview Texas Instruments SON-10, MSOP-10

Inductor suggestions

Below you can find matching inductors from Wuerth Elektronik calculated on the maximum parameters of LT3681.

V-IN max. 34 V, I-OUT 2 A, V-OUT min. 1.265 V, Frequency typ. 2800 kHz
Order Code Spec L (µH) IR (A) ISAT (A) RDC (mΩ) L x W x H (mm)
74402500047 0.5 3.3 4.7 19.00 2.8 x 2.8 x 3
74402500072 0.7 3.0 4.0 23.50 2.8 x 2.8 x 3
744040240068 0.7 2.5 3.5 35.00 2.5 x 2 x 1.2
744040320047 0.5 3.0 2.8 18.00 3 x 3 x 1.5
744040410047 0.5 3.3 4.3 28.00 4 x 4 x 1.2
74404200056 0.6 3.1 3.0 19.00 4.8 x 4.8 x 2
74404300082 0.8 3.5 3.7 14.00 4.8 x 4.8 x 3
74406800056 0.6 3.4 4.0 22.00 8 x 8 x 1.2
744383210047 0.5 2.2 3.7 76.00 2.5 x 2 x 0.6
744383220047 0.5 2.3 4.4 70.00 2.5 x 2 x 0.8
744383230068 0.7 3.1 4.7 46.00 2.5 x 2 x 1
744383230082 0.8 2.6 4.3 53.00 2.5 x 2 x 1
744383430068 0.7 2.0 4.7 65.00 2.5 x 1.6 x 0.6
74479275147 0.5 2.6 3.3 38.00 2 x 1.25 x 1
74479276147 0.5 2.9 4.2 34.00 2 x 1.6 x 1
74479276147C 0.5 2.7 4.5 33.00 2 x 1.25 x 1
74479276168 0.7 2.5 3.4 45.00 2 x 1.6 x 1
74479298147 0.5 3.0 4.5 28.00 3.2 x 2.5 x 1
74479976147 0.5 2.7 2.9 24.00 2 x 1.6 x 0.5
74479976147A 0.5 3.0 3.4 20.00 2 x 1.6 x 0.5
74479977147 0.5 2.2 2.4 55.00 2 x 1.6 x 0.9
784383210047 0.5 2.2 3.7 76.00 2.5 x 2 x 0.6
784383220047 0.5 2.3 4.4 70.00 2.5 x 2 x 0.8
784383230068 0.7 3.1 4.7 46.00 2.5 x 2 x 1
784383230082 0.8 2.6 4.3 53.00 2.5 x 2 x 1
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