LT3971-3.3 Buck Converter overview

Description

Manufacturer
 
Category
Sub-Category

LT3971-3.3 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 3.30 V to 3.30 V output voltage.

It requires are a typical inductor size of 4.70 µH, a typical external component count of 6 and achieves a peak efficiency of 89 %. Further LT3971-3.3 characteristics are a adjustable 2000 kHz switching frequency and 2 available package option(s): MSOP-10 DFN-10 .

For the LT3971-3.3 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. 3.30 V
V-OUT max. 3.30 V
V-OUT 3.300 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. 6
current limit adjustable no
Nr.of packages 2
CSP
SC70
SOT
MSOP MSOP-10
QFN/DFN DFN-10
SO/SOIC
SOP
DIP
TO
DDPAK

LT3971-3.3 Datasheet

Link to the most up-to-date LT3971-3.3 datasheet and the product page for EVM, tools and support information.

LT3971-3.3

LT3971-3.3 Sample stock and distributor price breaks

LT3971-3.3 prices and online available distributors.

OEMSecrets.com
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Available Distributors with stock: 8

Chip One Stop (12)

ProductStockPriceBuy
LT3971AIMSE#PBF4
14.79 USD
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LT3971EDD-3.3#PBF757
15.97 USD
1004.40 USD
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LT3971EDD#PBF376
15.97 USD
1004.40 USD
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LT3971EMSE-3.3#PBF69
16.14 USD
105.86 USD
503.88 USD
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LT3971EMSE-3.3#PBF552
15.97 USD
1004.40 USD
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LT3971EMSE-5#PBF1
14.05 USD
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LT3971EMSE#PBF208
16.18 USD
105.86 USD
503.88 USD
1003.42 USD
2003.37 USD
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LT3971EMSE#PBF796
15.97 USD
1004.40 USD
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LT3971IDD#PBF86
15.88 USD
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LT3971IMSE-3.3#PBF729
15.88 USD
1004.89 USD
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LT3971IMSE-5#PBF172
15.88 USD
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LT3971IMSE#PBF525
15.88 USD
1004.89 USD
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Conrad COM (2)

ProductStockPriceBuy
LT3971EMSE-3.3#PBF2Buy Now
LT3971IMSE#PBF4Buy Now

Digi-Key (13)

ProductStockPriceBuy
LT3971EMSE#PBF2160
16.00 USD
254.01 USD
1003.41 USD
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LT3971EMSE-5#PBF1527
16.00 USD
254.01 USD
1003.41 USD
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LT3971EDD-5#PBF1390
16.00 USD
254.01 USD
1003.41 USD
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LT3971EDD#PBF953
16.00 USD
254.01 USD
1003.41 USD
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LT3971EMSE-3.3#PBF297
16.00 USD
254.01 USD
1003.41 USD
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LT3971EDD-3.3#PBF199
16.00 USD
254.01 USD
1003.41 USD
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LT3971IMSE#PBF575
16.66 USD
254.46 USD
1003.79 USD
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LT3971IMSE-3.3#PBF471
16.66 USD
254.46 USD
1003.79 USD
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LT3971AIMSE#PBF112
17.30 USD
254.89 USD
1004.15 USD
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LT3971IDD-5#PBF540
16.66 USD
254.46 USD
1003.79 USD
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LT3971IDD#PBF69
16.66 USD
254.46 USD
1003.79 USD
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LT3971IMSE16#PBF62
16.82 USD
254.58 USD
1003.89 USD
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LT3971EMSE16#PBF15
16.20 USD
254.15 USD
1003.53 USD
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LT3971EDD#TRPBF0
25003.51 USD
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LT3971EMSE#TRPBF0
25003.51 USD
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LT3971EMSE-3.3#TRPBF0
25003.51 USD
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LT3971EMSE-5#TRPBF0
25003.51 USD
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LT3971EDD-3.3#TRPBF0
25003.51 USD
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LT3971EDD-5#TRPBF0
25003.51 USD
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LT3971EMSE16#TRPBF0
25003.63 USD
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LT3971IMSE-5#PBF0
2003.79 USD
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LT3971IDD-3.3#PBF0
2423.79 USD
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LT3971IDD#TRPBF0
25003.90 USD
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LT3971IMSE#TRPBF0
25003.90 USD
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LT3971IMSE-3.3#TRPBF0
25003.90 USD
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Distrelec (3)

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LT3971EDD#PBF9Buy Now
LT3971EMSE#PBF80Buy Now
LT3971IMSE-5#PBF115Buy Now

Element14 (4)

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LT3971AIMSE#PBF30
111.47 USD
257.68 USD
1006.53 USD
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LT3971EDD-3.30
19.46 USD
256.59 USD
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LT3971EDD-50
19.46 USD
256.59 USD
1005.68 USD
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LT3971EDD#PBF422
19.43 USD
256.30 USD
1005.36 USD
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LT3971EMSE#PBF315
19.25 USD
256.18 USD
1005.25 USD
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LT3971IMSE#PBF169
110.46 USD
257.01 USD
1005.97 USD
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Farnell Element14 (6)

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LT3971AIMSE#PBF46Buy Now
LT3971EDD#PBF450Buy Now
LT3971EMSE16#PBF17Buy Now
LT3971EMSE#PBF492Buy Now
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LT3971IMSE#PBF169Buy Now

Newark Electronics (2)

ProductStockPriceBuy
LT3971AIMSE#PBF0
17.17 USD
254.81 USD
1004.07 USD
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LT3971EDD-3.3#PBF0
15.88 USD
253.95 USD
1003.34 USD
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LT3971EDD-3.3#TRPBF0
15.70 USD
25004.09 USD
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LT3971EDD-5#PBF0
15.88 USD
253.95 USD
1003.34 USD
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LT3971EDD#PBF7
13.14 USD
253.14 USD
1003.14 USD
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LT3971EDD#TRPBF0
15.70 USD
25004.09 USD
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LT3971EMSE-3.3#PBF0
15.88 USD
253.95 USD
1003.34 USD
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LT3971EMSE-5#PBF69
11.95 USD
251.95 USD
1001.95 USD
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LT3971EMSE#PBF0
15.88 USD
253.95 USD
1003.34 USD
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LT3971EMSE#TRPBF0
15.70 USD
25004.09 USD
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LT3971IMSE#PBF0
16.55 USD
254.39 USD
1003.72 USD
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RS Components (3)

ProductStockPriceBuy
LT3971EMSE#PBF28Buy Now
LT3971EMSE#PBF50Buy Now
LT3971IDD#PBF50Buy Now

Available Distributors with stock: 9

Arrow Electronics

ProductStockPriceBuy
LT3971EMSE#PBF 796
13.93 $
1003.34 $
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LT3971IMSE-3.3#PBF 699
14.37 $
1003.72 $
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LT3971EMSE-3.3#PBF 542
13.93 $
1003.34 $
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LT3971IMSE#PBF 525
14.37 $
1003.72 $
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LT3971EDD#PBF 321
13.93 $
1003.34 $
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LT3971IMSE-5#PBF 97
14.37 $
1003.72 $
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LT3971IDD#PBF 86
14.37 $
1003.72 $
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LT3971EDD-3.3#PBF 37
13.93 $
1003.34 $
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LT3971AIMSE#PBF 4
14.79 $
1004.07 $
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LT3971EMSE-5#PBF 1
13.93 $
1003.34 $
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LT3971EMSE-5#PBF 0
9003.34 $
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LT3971AIMSE#PBF 0
4004.07 $
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LT3971AIMSE#TRPBF 0
25004.17 $
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LT3971IDD-5#TRPBF 0
25003.82 $
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LT3971EDD-5#TRPBF 0
25003.44 $
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Digi-Key

ProductStockPriceBuy
LT3971EMSE#PBF 2160
1002.85 €
253.36 €
15.02 €
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LT3971EMSE-5#PBF 1527
1002.85 €
253.36 €
15.02 €
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LT3971EDD-5#PBF 1390
1002.85 €
253.36 €
15.02 €
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LT3971EDD#PBF 953
1002.85 €
253.36 €
15.02 €
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LT3971IMSE#PBF 575
1003.18 €
253.73 €
15.57 €
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LT3971IDD-5#PBF 540
1003.18 €
253.73 €
15.57 €
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LT3971IMSE-3.3#PBF 471
1003.18 €
253.73 €
15.57 €
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LT3971EMSE-3.3#PBF 297
1002.85 €
253.36 €
15.02 €
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LT3971EDD-3.3#PBF 199
1002.85 €
253.36 €
15.02 €
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LT3971AIMSE#PBF 112
1003.47 €
254.09 €
16.11 €
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LT3971IDD#PBF 69
1003.18 €
253.73 €
15.57 €
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LT3971IMSE16#PBF 62
1003.25 €
253.83 €
15.71 €
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LT3971EMSE16#PBF 15
1002.95 €
253.47 €
15.19 €
Buy Now
LT3971EDD#TRPBF 0
25002.94 €
Buy Now
LT3971EMSE#TRPBF 0
25002.94 €
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show stock=0hide stock=0

Newark element14

ProductStockPriceBuy
LT3971EDD-3.3#PBF 0
15.88 $
253.95 $
1003.34 $
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LT3971EMSE#TRPBF 0
15.70 $
25004.09 $
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LT3971EDD-5#PBF 0
15.88 $
253.95 $
1003.34 $
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LT3971EMSE-3.3#PBF 0
15.88 $
253.95 $
1003.34 $
Buy Now
LT3971EDD#PBF 13
13.14 $
253.14 $
1003.14 $
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LT3971EDD-3.3#TRPBF 0
15.70 $
25004.09 $
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LT3971IMSE#PBF 0
16.55 $
254.39 $
1003.72 $
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LT3971AIMSE#PBF 0
17.17 $
254.81 $
1004.07 $
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LT3971EDD#TRPBF 0
15.70 $
25004.09 $
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LT3971EMSE-5#PBF 69
11.95 $
251.95 $
1001.95 $
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LT3971EMSE#PBF 0
15.88 $
253.95 $
1003.34 $
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show stock=0hide stock=0

Mouser Electronics

ProductStockPriceBuy
LT3971EMSE#PBF 500
16.01 $
105.51 $
254.01 $
1003.41 $
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LT3971EDD-3.3#PBF 121
16.01 $
105.51 $
254.01 $
1003.41 $
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LT3971EMSE-3.3#PBF 200
16.01 $
105.51 $
254.01 $
1003.41 $
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LT3971EDD#PBF 121
16.01 $
105.51 $
254.01 $
1003.41 $
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LT3971EMSE-5#PBF 200
16.01 $
105.51 $
254.01 $
1003.41 $
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LT3971EDD-5#PBF 121
16.01 $
105.51 $
254.01 $
1003.41 $
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LT3971IMSE#PBF 0
16.68 $
106.12 $
254.46 $
1003.80 $
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LT3971IMSE16#PBF 0
2223.89 $
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LT3971EDD#TRPBF 0
25003.51 $
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LT3971AIMSE#PBF 0
2004.16 $
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LT3971EMSE-3.3#TRPBF 0
25003.51 $
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LT3971EMSE-5#TRPBF 0
25003.51 $
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LT3971IDD#TRPBF 0
25003.90 $
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LT3971IMSE#TRPBF 0
25003.90 $
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LT3971IMSE16#TRPBF 0
25003.99 $
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show stock=0hide stock=0

ComS.I.T.

ProductStockPriceBuy
LT3971EDD33PBF 2

element14 Asia-Pacific

ProductStockPriceBuy
LT3971EDD#PBF 422
17.54 $
255.04 $
1004.28 $
Buy Now
LT3971IMSE#PBF 169
18.37 $
255.61 $
1004.77 $
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LT3971EDD-5 0
17.57 $
255.27 $
1004.54 $
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LT3971AIMSE#PBF 30
19.18 $
256.14 $
1005.22 $
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LT3971EDD-3.3 0
17.57 $
255.27 $
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LT3971EMSE#PBF 315
17.40 $
254.94 $
1004.20 $
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show stock=0hide stock=0

Farnell element14

ProductStockPriceBuy
LT3971EMSE16#PBF 17
12.56 GBP
Buy Now
LT3971IMSE16#PBF 11
12.79 GBP
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LT3971EDD#PBF 450
14.94 GBP
252.99 GBP
1002.72 GBP
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LT3971IMSE#PBF 169
15.47 GBP
253.33 GBP
1003.03 GBP
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LT3971AIMSE#PBF 66
16.06 GBP
253.70 GBP
1003.32 GBP
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LT3971EMSE#PBF 492
14.94 GBP
252.99 GBP
1002.72 GBP
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LT3971EDD-5 0
14.95 GBP
252.99 GBP
1002.93 GBP
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show stock=0hide stock=0

Chip1Stop

ProductStockPriceBuy
LT3971EDD-3.3#PBF 37
15.97 $
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LT3971EMSE-3.3#PBF 552
15.97 $
1004.40 $
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LT3971EMSE-3.3#PBF 69
16.14 $
105.86 $
503.88 $
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LT3971EDD#PBF 321
15.97 $
1004.40 $
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LT3971IMSE#PBF 525
15.88 $
1004.89 $
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LT3971AIMSE#PBF 4
14.79 $
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LT3971IDD#PBF 86
15.88 $
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LT3971EMSE-5#PBF 1
14.05 $
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LT3971EMSE-5#PBF 50
17.60 $
104.46 $
503.81 $
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LT3971EMSE#PBF 796
15.97 $
1004.40 $
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LT3971EMSE#PBF 208
16.18 $
503.88 $
2003.37 $
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LT3971IMSE-3.3#PBF 699
15.88 $
1004.89 $
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LT3971IMSE-5#PBF 97
15.88 $
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RS Components

ProductStockPriceBuy
LT3971IDD#PBF 50
105.86 GBP
255.77 GBP
505.71 GBP
755.62 GBP
Buy Now
LT3971EMSE#PBF 28
15.06 GBP
104.81 GBP
254.31 GBP
504.08 GBP
754.03 GBP
Buy Now
LT3971EMSE#PBF 50
104.81 GBP
254.31 GBP
504.08 GBP
754.03 GBP
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List of equivalents and alternatives

The following DC/DC Buck Converter are similar to LT3971-3.3. Optional, compare LT3971-3.3 side-by-side with other Buck Converter via the Comparison function.

Variation Compare Product Manufacturer Package
0% LT3991-3.3 LT3991-3.3 product overviewLT3991-3.3 product overview Linear Technology DFN-10, MSOP-10

Inductor suggestions

Below you can find matching inductors from Wuerth Elektronik calculated on the maximum parameters of LT3971-3.3.

V-IN max. 38 V, I-OUT 1.2 A, V-OUT min. 3.3 V, Frequency typ. 2000 kHz
Order Code Spec L (µH) IR (A) ISAT (A) RDC (mΩ) L x W x H (mm)
744025003 3.3 1.5 1.8 85.00 2.8 x 2.8 x 3
74404032033 3.3 1.5 1.5 70.00 3 x 3 x 1.5
74404041033 3.3 1.8 2.1 69.00 4 x 4 x 1.2
74404042033 3.3 2.0 2.9 55.00 4 x 4 x 1.8
74404052033 3.3 2.6 3.0 42.20 5 x 5 x 2
74404052039 3.9 2.4 2.8 50.50 5 x 5 x 2
7440420027 2.7 2.0 2.2 47.00 4.8 x 4.8 x 2
744042003 3.3 2.0 1.8 50.00 4.8 x 4.8 x 2
7440420039 3.9 1.8 1.7 60.00 4.8 x 4.8 x 2
7440430027 2.7 2.4 2.0 25.00 4.8 x 4.8 x 3
744043003 3.3 2.2 1.8 30.00 4.8 x 4.8 x 3
7440430039 3.9 1.7 1.7 50.00 4.8 x 4.8 x 3
7440450027 2.7 1.5 2.7 96.00 4.5 x 3.2 x 2.9
744045003 3.3 1.4 2.7 104.00 4.5 x 3.2 x 2.9
7440450039 3.9 1.3 2.5 112.00 4.5 x 3.2 x 2.9
744052002 2.5 2.4 2.7 20.00 5.8 x 5.8 x 2
744052003 3.0 2.2 2.4 40.00 5.8 x 5.8 x 2
7440520039 3.9 2.0 2.1 50.00 5.8 x 5.8 x 2
744053002 2.6 3.0 2.7 20.00 5.8 x 5.8 x 3
744053003 3.0 2.8 2.5 20.00 5.8 x 5.8 x 3
744053004 4.2 2.5 2.2 30.00 5.8 x 5.8 x 3
744062003 3.3 2.8 2.5 20.00 6.8 x 6.8 x 2.5
7440680027 2.7 2.2 1.9 52.00 8 x 8 x 1.2
7440680033 3.3 2.0 1.8 61.00 8 x 8 x 1.2
7440690033 3.3 2.6 2.3 42.00 8 x 8 x 1.5
7440700033 3.3 3.2 2.6 30.00 8 x 8 x 2
74408941029 2.9 1.6 3.0 101.00 4.8 x 4.8 x 2.1
74408941035 3.5 1.5 2.8 113.00 4.8 x 4.8 x 2.1
74438323033 3.3 1.3 2.1 220.00 2.5 x 2 x 1
74438324033 3.3 1.3 2.6 226.00 2.5 x 2 x 1.2
744773027 2.7 2.3 3.0 39.00 4 x 4.5 x 3.5
744773033 3.3 2.0 2.9 41.00 4 x 4.5 x 3.5
744773039 3.9 1.9 2.6 54.00 4 x 4.5 x 3.5
7447785003 3.3 2.8 3.0 43.00 5.9 x 6.2 x 3.3
78438323033 3.3 1.3 2.1 220.00 2.5 x 2 x 1
784773033 3.3 2.0 2.9 41.00 4 x 4.5 x 3.5
784773039 3.9 1.9 2.6 54.00 4 x 4.5 x 3.5
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