LT3971 Buck Converter overview

Description

Manufacturer
 
Category
Sub-Category

LT3971 is a 38.00 V non-sync Buck Converter from with 1.20 A output current. The maximum 38.00 V input voltage can be regulated down into a 1.19 V to 30.00 V output voltage.

It requires are a typical inductor size of 4.70 µH, a typical external component count of 8 and achieves a peak efficiency of 89 %. Further LT3971 characteristics are a adjustable 2000 kHz switching frequency and 2 available package option(s): MSOP-10 DFN-10 .

For the LT3971 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. 4.30 V
V-IN max. 38.00 V
I-OUT? 1.20 A
V-OUT min. 1.19 V
V-OUT max. 30.00 V
V-OUT adjustable V
V-OUT programmable no
sync/non-sync non-sync
Frequency typ. 2000 kHz
Frequency adjustable
Frequency selectable
ext.clock sync. yes
Frequency adj./ ext.clock min. 250 kHz
Frequency adj./ ext.clock max 2000 kHz
Softstart yes
Softstart adjustable yes
Tracking no
PG/Power OK yes
Quiescent current max. 4.5 µA
Operating min.
Operating max.
Junction min. -40 °C
Junction max. 125 °C
thermal shutdown typ.
Inductor size typ. 4.70 µH
Inductor suggested by Würth Elektronik
Automotive AEC-Q100 no
Light-Load-Mode yes
Topology Buck
Peak Efficiency 89 %
Component count min. 8
current limit adjustable no
Nr.of packages 2
CSP
SC70
SOT
MSOP MSOP-10
QFN/DFN DFN-10
SO/SOIC
SOP
DIP
TO
DDPAK

LT3971 Datasheet

Link to the most up-to-date LT3971 datasheet and the product page for EVM, tools and support information.

LT3971

LT3971 Sample stock and distributor price breaks

LT3971 prices and online available distributors.

OEMSecrets.com
findchips.com

Available Distributors with stock: 0

no online Distributor with LT3971 stock available

Available Distributors with stock: 10

Arrow Electronics

ProductStockPriceBuy
LT3971EMSE-5#TRPBF 2500
25003.44 $
Buy Now
LT3971EDD#TRPBF 1559
1003.44 $
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LT3971EMSE-5#PBF 194
10003.09 $
5003.21 $
2503.29 $
1003.34 $
254.19 $
16.32 $
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LT3971IMSE-3.3#PBF 147
1003.72 $
254.68 $
17.05 $
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LT3971EDD-3.3#PBF 110
10003.09 $
5003.21 $
2503.29 $
1003.34 $
254.19 $
16.32 $
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LT3971EDD#PBF 45
10003.09 $
5003.21 $
2503.29 $
1003.34 $
254.19 $
16.32 $
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LT3971IMSE-5#PBF 41
1003.72 $
14.37 $
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LT3971EMSE-5#PBF 39
2503.39 $
1003.46 $
254.19 $
16.32 $
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LT3971EMSE-3.3#PBF 19
10003.09 $
5003.21 $
2503.29 $
1003.34 $
254.19 $
16.32 $
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LT3971EMSE#PBF 7
10003.09 $
5003.21 $
2503.29 $
1003.34 $
254.19 $
16.32 $
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LT3971IDD#PBF 2
10003.45 $
5003.58 $
2503.67 $
1003.72 $
254.67 $
17.04 $
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LT3971EMSE-3.3#PBF 0
2503.39 $
2003.46 $
Buy Now
LT3971EMSE-3.3#PBF 0
10003.09 $
5003.21 $
2503.29 $
1003.34 $
254.19 $
16.32 $
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LT3971EDD#TRPBF 0
25003.44 $
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LT3971IMSE16#PBF 0
1853.81 $
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Digi-Key

ProductStockPriceBuy
LT3971EMSE#PBF 2643
1003.28 €
253.97 €
15.98 €
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LT3971EMSE-3.3#PBF 2362
1003.28 €
253.97 €
15.98 €
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LT3971IMSE#PBF 1818
1003.65 €
254.42 €
16.65 €
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LT3971EMSE-5#TRPBF 1396
1003.48 €
254.21 €
16.34 €
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LT3971EMSE-5#TRPBF 1396
1003.48 €
254.21 €
16.34 €
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LT3971EMSE-5#PBF 1092
1003.28 €
253.97 €
15.98 €
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LT3971EDD-5#PBF 796
1003.28 €
253.97 €
15.98 €
Buy Now
LT3971EDD-3.3#PBF 341
1003.28 €
253.97 €
15.98 €
Buy Now
LT3971IMSE-3.3#PBF 307
1003.65 €
254.42 €
16.65 €
Buy Now
LT3971IMSE16#PBF 285
1003.74 €
254.53 €
16.81 €
Buy Now
LT3971AIMSE#PBF 258
1004.00 €
254.84 €
17.29 €
Buy Now
LT3971EDD#PBF 257
1003.28 €
253.97 €
15.98 €
Buy Now
LT3971IDD#PBF 242
1003.65 €
254.42 €
16.65 €
Buy Now
LT3971IDD-5#PBF 137
1003.65 €
254.42 €
16.65 €
Buy Now
LT3971EMSE-5#TRPBF 0
25003.12 €
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Verical

ProductStockPriceBuy
LT3971EDD-5#PBF 363
2503.20 $
1003.28 $
253.97 $
35.99 $
Buy Now
LT3971EMSE-5#PBF 194
10003.09 $
5003.21 $
2503.29 $
1003.34 $
254.19 $
26.32 $
Buy Now
LT3971IMSE-3.3#PBF 147
1003.72 $
254.68 $
27.05 $
Buy Now
LT3971EDD-3.3#PBF 110
10003.09 $
5003.21 $
2503.29 $
1003.34 $
254.19 $
26.32 $
Buy Now
LT3971EDD#PBF 45
10003.09 $
5003.21 $
2503.29 $
1003.34 $
254.19 $
26.32 $
Buy Now
LT3971IMSE-5#PBF 41
1003.72 $
24.37 $
Buy Now
LT3971EMSE-5#PBF 39
2503.39 $
1003.46 $
254.19 $
26.32 $
Buy Now
LT3971EMSE-3.3#PBF 19
10003.09 $
5003.21 $
2503.29 $
1003.34 $
254.19 $
26.32 $
Buy Now
LT3971IMSE16#PBF 9
34.61 $
Buy Now
LT3971EMSE#PBF 7
10003.09 $
5003.21 $
2503.29 $
1003.34 $
254.19 $
26.32 $
Buy Now
LT3971IDD#PBF 2
10003.45 $
5003.58 $
2503.67 $
1003.72 $
254.67 $
27.04 $
Buy Now

Mouser Electronics

ProductStockPriceBuy
LT3971IDD#PBF 1074
17.41 $
254.92 $
1004.06 $
2503.86 $
5003.77 $
10003.63 $
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LT3971EMSE#PBF 1702
16.65 $
254.41 $
1003.64 $
2503.46 $
5003.38 $
10003.25 $
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LT3971EMSE-3.3#PBF 1329
16.65 $
254.41 $
1003.64 $
2503.46 $
5003.38 $
10003.25 $
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LT3971EDD-3.3#PBF 767
16.65 $
254.41 $
1003.64 $
2503.46 $
5003.38 $
10003.25 $
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LT3971IMSE#PBF 528
17.41 $
254.92 $
1004.06 $
2503.86 $
5003.77 $
10003.63 $
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LT3971EMSE-5#PBF 344
16.65 $
254.41 $
1003.64 $
2503.46 $
5003.38 $
10003.25 $
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LT3971EDD#PBF 315
16.65 $
254.41 $
1003.64 $
2503.46 $
5003.38 $
10003.25 $
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LT3971EDD-5#PBF 279
16.65 $
254.41 $
1003.64 $
2503.46 $
5003.38 $
10003.25 $
Buy Now
LT3971AIMSE#PBF 140
18.10 $
255.38 $
1004.44 $
2504.22 $
5004.13 $
10003.97 $
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Rochester Electronics

ProductStockPriceBuy
LT3971IMSE16#PBF 2368
10003.69 $
5003.73 $
1003.77 $
253.80 $
13.84 $
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Quest Components

ProductStockPriceBuy
LT3971EMSE#PBF 8
82.63 $
33.50 $
15.25 $
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LT3971IMSE#3GKPBF 710
5863.14 $
1363.42 $
18.55 $
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LT3971IMSE#3GKPBF 710
5863.14 $
1363.42 $
18.55 $
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RS Components

ProductStockPriceBuy
LT3971IDD#PBF 438
105.35 GBP
253.74 GBP
503.64 GBP
1212.94 GBP
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LT3971IDD#PBF 438
15.63 GBP
105.35 GBP
253.74 GBP
503.64 GBP
1212.94 GBP
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LT3971IDD#PBF 0
13.73 GBP
3633.63 GBP
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LT3971EMSE#PBF 88
15.05 GBP
104.48 GBP
253.91 GBP
Buy Now
LT3971EMSE#PBF 88
104.48 GBP
253.91 GBP
Buy Now
LT3971EMSE#PBF 0
13.35 GBP
Buy Now
show stock=0hide stock=0

ComS.I.T.

ProductStockPriceBuy
LT3971EDD33PBF 2

Chip1Stop

ProductStockPriceBuy
LT3971EMSE-5#PBF 6
13.27 $
Buy Now
LT3971EMSE-3.3#PBF 429
1003.49 $
503.88 $
104.97 $
15.87 $
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LT3971EMSE#PBF 30
12.60 $
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Pulp Electronics

ProductStockPriceBuy
LT3971EDD#PBF/ID 10000
LT3971EDD-5#PBF 12000
LT3971IMSE-3.3#PBF 5000
LT3971AIMSE-5#PBF 10492
LT3971AEMSE#PBF/AI 7000
LT3971EDD-3.3#PBF/I 7000
LT3971IDD 3800
LT3971EDD#PBF 5600
LT3971EMSE-5#PBF/I/H 5800
LT3971AEMSE-5#PBF/AI 5000
LT3971IDD-3.3#PBF 10631
LT3971AEMSE#PBF 4000
LT3971AIMSE 7000
LT3971IMSE#TRPBF 9113
LT3971AEMSE-5#PBF 9000

Available Distributors without stock: 3

Richardson RFPD

ProductStockPriceBuy
LT3971EDD-5#PBF 0
1213.70 $
5003.60 $
10003.50 $
50003.37 $
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LT3971IDD-5#TRPBF 0
25003.97 $
50003.83 $
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LT3971EMSE-3.3#TRPBF 0
25003.58 $
50003.45 $
Buy Now
LT3971IMSE-3.3#PBF 0
1504.12 $
5004.01 $
10003.91 $
50003.75 $
Buy Now
LT3971IMSE16#TRPBF 0
25004.08 $
50003.93 $
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LT3971AIMSE-5#PBF 0
1504.51 $
5004.39 $
10004.26 $
50004.11 $
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LT3971EMSE16#TRPBF 0
25003.70 $
50003.56 $
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LT3971IMSE-5#TRPBF 0
25003.97 $
50003.83 $
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LT3971EMSE-5#PBF 0
2003.70 $
5003.60 $
10003.50 $
50003.37 $
Buy Now
LT3971EDD#PBF 0
1213.70 $
5003.60 $
10003.50 $
50003.37 $
Buy Now
LT3971IDD-3.3#PBF 0
1214.12 $
5004.01 $
10003.91 $
50003.75 $
Buy Now
LT3971IMSE#TRPBF 0
25003.97 $
50003.83 $
Buy Now
LT3971EDD-5#TRPBF 0
25003.58 $
50003.45 $
Buy Now
LT3971IDD#PBF 0
1214.12 $
5004.01 $
10003.91 $
50003.75 $
Buy Now
LT3971EMSE-3.3#PBF 0
2003.70 $
5003.60 $
10003.50 $
50003.37 $
Buy Now

element14 Asia-Pacific

ProductStockPriceBuy
LT3971EDD#PBF 0
5005.18 SGD
2505.30 SGD
1005.58 SGD
256.75 SGD
110.16 SGD
Buy Now
LT3971EMSE#PBF 0
5005.18 SGD
2505.30 SGD
1005.58 SGD
256.75 SGD
110.16 SGD
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Farnell element14

ProductStockPriceBuy
LT3971EDD#PBF 0
5002.72 GBP
2502.79 GBP
1002.86 GBP
503.16 GBP
253.46 GBP
105.23 GBP
15.75 GBP
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LT3971IMSE16#PBF 0
12.33 GBP
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LT3971EDD-3.3 0
1003.08 GBP
253.14 GBP
15.19 GBP
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LT3971EMSE#PBF 0
5002.56 GBP
2502.66 GBP
1002.76 GBP
502.86 GBP
252.96 GBP
104.07 GBP
14.91 GBP
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LT3971IMSE#PBF 0
502.64 GBP
252.86 GBP
103.19 GBP
13.85 GBP
Buy Now
LT3971EMSE16#PBF 0
102.04 GBP
12.08 GBP
Buy Now
LT3971AIMSE#PBF 0
5003.32 GBP
2503.33 GBP
1003.34 GBP
503.35 GBP
253.36 GBP
105.47 GBP
15.99 GBP
Buy Now
LT3971EDD-5 0
1002.93 GBP
252.99 GBP
14.95 GBP
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List of equivalents and alternatives

The following DC/DC Buck Converter are similar to LT3971. Optional, compare LT3971 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% LT3971A LT3971A product overviewLT3971A product overview Linear Technology MSOP-8
0% LT3980 LT3980 product overviewLT3980 product overview Linear Technology DFN-14, MSOP-16
0% LT3991 LT3991 product overviewLT3991 product overview Linear Technology DFN-10, MSOP-10
0% TPS54140A TPS54140A product overviewTPS54140A product overview Texas Instruments SON-10, MSOP-10
0% TPS54262-Q1 TPS54262-Q1 product overviewTPS54262-Q1 product overview Texas Instruments HTSSOP-20
10% LT3480 LT3480 product overviewLT3480 product overview Linear Technology DFN-10, MSOP-10
10% LT3481 LT3481 product overviewLT3481 product overview Linear Technology DFN-10, MSOP-10
10% LT3682 LT3682 product overviewLT3682 product overview Linear Technology DFN-12
10% LM26001 LM26001 product overviewLM26001 product overview Texas Instruments HTSSOP-16
10% LM26001-Q1 LM26001-Q1 product overviewLM26001-Q1 product overview Texas Instruments HTSSOP-16
10% TPS54162-Q1 TPS54162-Q1 product overviewTPS54162-Q1 product overview Texas Instruments HTSSOP-20
10% TPS57160-Q1 TPS57160-Q1 product overviewTPS57160-Q1 product overview Texas Instruments SON-10, MSOP-10
50% MP2454 MP2454 product overviewMP2454 product overview MPS QFN-10, MSOP-10
50% MPQ2454 MPQ2454 product overviewMPQ2454 product overview MPS QFN-10, MSOP-10
50% MPQ2454-AEC1 MPQ2454-AEC1 product overviewMPQ2454-AEC1 product overview MPS QFN-10, MSOP-10

Inductor suggestions

Below you can find matching inductors from Wuerth Elektronik calculated on the maximum parameters of LT3971.

V-IN max. 38 V, I-OUT 1.2 A, V-OUT min. 1.19 V, Frequency typ. 2000 kHz
Order Code Spec L (µH) IR (A) ISAT (A) RDC (mΩ) L x W x H (mm)
744025001 1.2 2.6 3.0 36.00 2.8 x 2.8 x 3
744031001 1.5 1.8 1.6 40.00 3.8 x 3.8 x 1.8
74404024015 1.5 1.9 2.4 65.00 2.5 x 2 x 1.2
74404032015 1.5 2.0 2.3 40.00 3 x 3 x 1.5
7440420018 1.8 2.4 2.4 40.00 4.8 x 4.8 x 2
7440430012 1.2 3.1 2.8 15.00 4.8 x 4.8 x 3
7440430018 1.8 2.7 2.5 20.00 4.8 x 4.8 x 3
7440520018 1.8 2.6 3.0 30.00 5.8 x 5.8 x 2
7440680017 1.7 2.5 2.4 41.00 8 x 8 x 1.2
74438343015 1.5 1.3 3.0 150.00 2.5 x 1.6 x 0.6
74479976215 1.5 1.6 1.9 100.00 2 x 1.6 x 0.5
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