LT3973 Buck Converter overview

Description

Manufacturer
 
Category
Sub-Category

LT3973 is a 42.00 V sync Buck Converter from with 0.75 A output current. The maximum 42.00 V input voltage can be regulated down into a 1.21 V to 40.00 V output voltage.

It requires are a typical inductor size of 15.00 µH, a typical external component count of 8 and achieves a peak efficiency of 88 %. Further LT3973 characteristics are a adjustable 800 kHz switching frequency and 2 available package option(s): MSOP-10 DFN-10 .

For the LT3973 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. 4.20 V
V-IN max. 42.00 V
I-OUT? 0.75 A
V-OUT min. 1.21 V
V-OUT max. 40.00 V
V-OUT adjustable V
V-OUT programmable no
sync/non-sync sync
Frequency typ. 800 kHz
Frequency adjustable
Frequency selectable
ext.clock sync. no
Frequency adj./ ext.clock min. 195 kHz
Frequency adj./ ext.clock max 2150 kHz
Softstart no
Softstart adjustable no
Tracking no
PG/Power OK yes
Quiescent current max. 6 µA
Operating min.
Operating max.
Junction min. -40 °C
Junction max. 125 °C
thermal shutdown typ.
Inductor size typ. 15.00 µH
Inductor suggested by Würth Elektronik
Automotive AEC-Q100 no
Light-Load-Mode yes
Topology Buck
Peak Efficiency 88 %
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

LT3973 Datasheet

Link to the most up-to-date LT3973 datasheet and the product page for EVM, tools and support information.

LT3973

LT3973 Sample stock and distributor price breaks

LT3973 prices and online available distributors.

OEMSecrets.com
findchips.com

Available Distributors with stock: 0

no online Distributor with LT3973 stock available

Available Distributors with stock: 8

Arrow Electronics

ProductStockPriceBuy
LT3973IDD-3.3#TRPBF 2000
1003.78 $
Buy Now
LT3973EMSE-3.3#PBF 570
2503.52 $
1003.59 $
254.35 $
16.56 $
Buy Now
LT3973IDD-3.3#PBF 338
10003.41 $
5003.55 $
2503.63 $
1213.68 $
Buy Now
LT3973EMSE-5#PBF 248
10003.21 $
5003.34 $
2503.42 $
1003.46 $
254.35 $
16.56 $
Buy Now
LT3973EMSE-3.3#PBF 247
10003.21 $
5003.34 $
2503.42 $
1003.46 $
254.35 $
16.56 $
Buy Now
LT3973HMSE-3.3#PBF 147
2504.32 $
1004.42 $
255.34 $
18.05 $
Buy Now
LT3973EDD-3.3#PBF 107
2503.39 $
1003.46 $
254.19 $
16.32 $
Buy Now
LT3973EDD-5#PBF 68
10003.09 $
5003.21 $
2503.29 $
1003.34 $
254.19 $
16.32 $
Buy Now
LT3973HMSE#PBF 38
1004.24 $
14.99 $
Buy Now
LT3973EDD-5#PBF 19
2503.39 $
1003.46 $
254.19 $
16.32 $
Buy Now
LT3973IDD-5#PBF 3
1003.68 $
254.63 $
16.97 $
Buy Now
LT3973EDD-3.3#PBF 0
10003.09 $
5003.21 $
2503.29 $
1213.34 $
Buy Now
LT3973HMSE-3.3#PBF 0
25003.94 $
5004.10 $
2504.20 $
1504.24 $
Buy Now
LT3973EMSE-5#PBF 0
2503.52 $
1503.59 $
Buy Now
LT3973IDD-3.3#TRPBF 0
25003.78 $
Buy Now
show stock=0hide stock=0

Digi-Key

ProductStockPriceBuy
LT3973EDD#PBF 1138
1003.28 €
253.97 €
15.98 €
Buy Now
LT3973IDD-3.3#PBF 944
1003.62 €
254.38 €
16.60 €
Buy Now
LT3973EDD-5#PBF 783
1003.28 €
253.97 €
15.98 €
Buy Now
LT3973EMSE-5#PBF 656
1003.40 €
254.12 €
16.20 €
Buy Now
LT3973EMSE#PBF 398
1003.40 €
254.12 €
16.20 €
Buy Now
LT3973EMSE-3.3#PBF 381
1003.40 €
254.12 €
16.20 €
Buy Now
LT3973IMSE#PBF 380
1003.74 €
254.53 €
16.81 €
Buy Now
LT3973IMSE-5#PBF 354
1003.74 €
254.53 €
16.81 €
Buy Now
LT3973HDD-5#PBF 284
1004.03 €
254.88 €
17.35 €
Buy Now
LT3973IDD#PBF 230
1003.62 €
254.38 €
16.60 €
Buy Now
LT3973HMSE-3.3#PBF 172
1004.18 €
255.06 €
17.62 €
Buy Now
LT3973IDD-5#PBF 163
1003.62 €
254.38 €
16.60 €
Buy Now
LT3973HDD-3.3#PBF 112
1004.03 €
254.88 €
17.35 €
Buy Now
DC2026C 33
167.88 €
Buy Now
LT3973EDD#TRPBF 0
25003.12 €
Buy Now
show stock=0hide stock=0

Verical

ProductStockPriceBuy
LT3973EMSE-3.3#PBF 570
2503.52 $
1003.59 $
254.35 $
26.56 $
Buy Now
LT3973IDD-3.3#PBF 338
24.33 $
Buy Now
LT3973EMSE-5#PBF 248
10003.21 $
5003.34 $
2503.42 $
1003.46 $
254.35 $
26.56 $
Buy Now
LT3973EMSE-3.3#PBF 247
10003.21 $
5003.34 $
2503.42 $
1003.46 $
254.35 $
26.56 $
Buy Now
LT3973HMSE-3.3#PBF 147
2504.32 $
1004.42 $
255.34 $
28.05 $
Buy Now
LT3973EMSE-3.3#PBF 111
2503.32 $
1003.40 $
254.12 $
36.21 $
Buy Now
LT3973EDD-3.3#PBF 107
2503.39 $
1003.46 $
254.19 $
26.32 $
Buy Now
LT3973EDD-5#PBF 68
10003.09 $
5003.21 $
2503.29 $
1003.34 $
254.19 $
26.32 $
Buy Now
LT3973HMSE#PBF 38
1004.24 $
24.99 $
Buy Now
LT3973EDD-5#PBF 19
2503.39 $
1003.46 $
254.19 $
26.32 $
Buy Now
LT3973IDD-5#PBF 3
1003.68 $
254.63 $
26.97 $
Buy Now

Rochester Electronics

ProductStockPriceBuy
LT3973HMSE#PBF 400
10003.91 $
5003.95 $
1003.99 $
254.03 $
14.07 $
Buy Now

Quest Components

ProductStockPriceBuy
LT3973EMSE#PBF 100
337.18 $
107.76 $
111.64 $
Buy Now

RS Components

ProductStockPriceBuy
LT3973EMSE#PBF 81
15.50 GBP
105.08 GBP
254.67 GBP
Buy Now
LT3973EMSE#PBF 149
105.08 GBP
254.67 GBP
Buy Now
LT3973EMSE#PBF 0
503.56 GBP
2503.47 GBP
5003.39 GBP
Buy Now
show stock=0hide stock=0

ComS.I.T.

ProductStockPriceBuy
LT3973MSEPBF 42
LT3973IMSE5 6

Chip1Stop

ProductStockPriceBuy
LT3973EMSE#PBF 28
103.51 $
14.15 $
Buy Now
LT3973EDD#PBF 885
502.84 $
102.88 $
12.89 $
Buy Now
LT3973EDD-5#PBF 60
502.60 $
Buy Now

Available Distributors without stock: 3

Richardson RFPD

ProductStockPriceBuy
LT3973EMSE#PBF 0
2003.84 $
5003.73 $
10003.64 $
50003.50 $
Buy Now
LT3973EDD-3.3#TRPBF 0
25003.58 $
50003.45 $
Buy Now
LT3973IMSE#TRPBF 0
25004.08 $
50003.93 $
Buy Now
LT3973HDD-3.3#PBF 0
1214.55 $
5004.43 $
10004.30 $
50004.14 $
Buy Now
LT3973EMSE#TRPBF 0
25003.70 $
50003.56 $
Buy Now
LT3973HDD-5#TRPBF 0
25004.39 $
50004.22 $
Buy Now
LT3973EDD#PBF 0
1213.70 $
5003.60 $
10003.50 $
50003.37 $
Buy Now
LT3973EDD-5#PBF 0
1213.70 $
5003.60 $
10003.50 $
50003.37 $
Buy Now
LT3973IDD-5#TRPBF 0
25003.95 $
50003.79 $
Buy Now
LT3973EDD-3.3#PBF 0
1213.70 $
5003.60 $
10003.50 $
50003.37 $
Buy Now
LT3973HDD-3.3#TRPBF 0
25004.39 $
50004.22 $
Buy Now
LT3973EDD#TRPBF 0
25003.58 $
50003.45 $
Buy Now
LT3973EMSE-3.3#TRPBF 0
25003.70 $
50003.56 $
Buy Now
LT3973HMSE#TRPBF 0
25004.52 $
50004.36 $
Buy Now
LT3973EMSE-5#PBF 0
2003.84 $
5003.73 $
10003.64 $
50003.50 $
Buy Now

element14 Asia-Pacific

ProductStockPriceBuy
LT3973EMSE-5#PBF 0
5005.39 SGD
2505.51 SGD
1005.79 SGD
257.01 SGD
110.55 SGD
Buy Now
LT3973IMSE-3.3#PBF 0
5005.92 SGD
2506.05 SGD
1006.38 SGD
257.70 SGD
111.60 SGD
Buy Now
LT3973IMSE-5#PBF 0
5005.92 SGD
2506.05 SGD
1006.38 SGD
257.70 SGD
111.60 SGD
Buy Now

Farnell element14

ProductStockPriceBuy
LT3973EMSE#PBF 0
5002.74 GBP
2502.79 GBP
1002.83 GBP
502.88 GBP
252.92 GBP
104.36 GBP
14.82 GBP
Buy Now
LT3973EDD-5#PBF 0
1002.72 GBP
252.99 GBP
14.94 GBP
Buy Now
LT3973EDD-3.3#PBF 0
1002.58 GBP
252.84 GBP
14.69 GBP
Buy Now
LT3973EMSE-5#PBF 0
5002.53 GBP
2502.57 GBP
1002.61 GBP
502.64 GBP
252.68 GBP
104.01 GBP
14.43 GBP
Buy Now
LT3973IMSE-3.3#PBF 0
1003.11 GBP
253.51 GBP
15.73 GBP
Buy Now
LT3973EMSE-3.3#PBF 0
5002.83 GBP
2502.88 GBP
1002.92 GBP
502.97 GBP
253.01 GBP
104.49 GBP
14.97 GBP
Buy Now
LT3973IDD-5#PBF 0
1003.00 GBP
253.29 GBP
15.42 GBP
Buy Now
LT3973IMSE-5#PBF 0
1003.11 GBP
253.51 GBP
15.73 GBP
Buy Now
LT3973IDD-3.3#PBF 0
12.53 GBP
Buy Now

List of equivalents and alternatives

The following DC/DC Buck Converter are similar to LT3973. Optional, compare LT3973 side-by-side with other Buck Converter via the Comparison function.

Variation Compare Product Manufacturer Package
0% LTC3646-1 LTC3646-1 product overviewLTC3646-1 product overview Linear Technology DFN-14, MSOP-16
0% LM46001 LM46001 product overviewLM46001 product overview Texas Instruments HTSSOP-16
0% LM46001-Q1 LM46001-Q1 product overviewLM46001-Q1 product overview Texas Instruments HTSSOP-16
10% ADP2441 ADP2441 product overviewADP2441 product overview Analog Devices LFCSP-12
10% ADP2442 ADP2442 product overviewADP2442 product overview Analog Devices LFCSP-12
10% LM43601 LM43601 product overviewLM43601 product overview Texas Instruments HTSSOP-16
10% LM43601-Q1 LM43601-Q1 product overviewLM43601-Q1 product overview Texas Instruments HTSSOP-16
25% LM43600 LM43600 product overviewLM43600 product overview Texas Instruments HTSSOP-16
25% LM43600-Q1 LM43600-Q1 product overviewLM43600-Q1 product overview Texas Instruments HTSSOP-16
25% LM46000 LM46000 product overviewLM46000 product overview Texas Instruments HTSSOP-16
25% LM46000-Q1 LM46000-Q1 product overviewLM46000-Q1 product overview Texas Instruments HTSSOP-16
50% LT3970 LT3970 product overviewLT3970 product overview Linear Technology DFN-10, MSOP-10
50% LT3990 LT3990 product overviewLT3990 product overview Linear Technology DFN-10, MSOP-16
50% ER3105 ER3105 product overviewER3105 product overview Altera DFN-12

Inductor suggestions

Below you can find matching inductors from Wuerth Elektronik calculated on the maximum parameters of LT3973.

V-IN max. 42 V, I-OUT 0.75 A, V-OUT min. 1.21 V, Frequency typ. 800 kHz
Order Code Spec L (µH) IR (A) ISAT (A) RDC (mΩ) L x W x H (mm)
744025004 4.7 1.4 1.7 100.00 2.8 x 2.8 x 3
744025006 6.8 1.1 1.3 142.00 2.8 x 2.8 x 3
744031004 4.7 1.2 0.9 90.00 3.8 x 3.8 x 1.8
74404024047 4.7 1.1 1.2 175.00 2.5 x 2 x 1.2
74404024068 6.8 0.9 1.0 300.00 2.5 x 2 x 1.2
74404032047 4.7 1.3 1.2 96.00 3 x 3 x 1.5
74404032068 6.8 1.2 0.9 120.00 3 x 3 x 1.5
74404042068 6.8 1.5 1.8 98.00 4 x 4 x 1.8
744042004 4.7 1.7 1.7 70.00 4.8 x 4.8 x 2
744042005 5.6 1.6 1.4 80.00 4.8 x 4.8 x 2
744042006 6.8 1.5 1.3 80.00 4.8 x 4.8 x 2
744043004 4.7 1.6 1.7 50.00 4.8 x 4.8 x 3
744043005 5.6 1.4 1.3 70.00 4.8 x 4.8 x 3
744043006 6.8 1.3 1.3 80.00 4.8 x 4.8 x 3
744045006 6.8 1.1 1.6 160.00 4.5 x 3.2 x 2.9
744052005 5.0 1.7 1.8 50.00 5.8 x 5.8 x 2
744052006 6.2 1.5 1.6 70.00 5.8 x 5.8 x 2
744052007 7.5 1.4 1.5 70.00 5.8 x 5.8 x 2
744053006 6.2 2.2 1.7 40.00 5.8 x 5.8 x 3
744062006 6.2 1.9 1.8 40.00 6.8 x 6.8 x 2.5
744062007 7.5 1.7 1.6 50.00 6.8 x 6.8 x 2.5
7440680047 4.7 1.9 1.6 72.00 8 x 8 x 1.2
7440680056 5.6 1.5 1.4 110.00 8 x 8 x 1.2
7440680068 6.8 1.4 1.2 127.00 8 x 8 x 1.2
7440690047 4.7 2.2 1.8 56.00 8 x 8 x 1.5
7440690068 6.8 1.8 1.7 88.00 8 x 8 x 1.5
7440700068 6.8 2.4 1.8 56.00 8 x 8 x 2
74438323047 4.7 0.9 1.8 338.00 2.5 x 2 x 1
74438323068 6.8 0.9 1.6 563.00 2.5 x 2 x 1
74438324056 5.6 1.0 1.8 405.00 2.5 x 2 x 1.2
74438324068 6.8 0.9 1.6 560.00 2.5 x 2 x 1.2
74479889247 4.7 0.9 0.9 400.00 2.5 x 2 x 1.2
78438323047 4.7 0.9 1.8 338.00 2.5 x 2 x 1
78438323068 6.8 0.9 1.6 563.00 2.5 x 2 x 1
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