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: 7

Chip One Stop (13)

ProductStockPriceBuy
LT3973EDD-3.3#PBF151
14.41 USD
1003.52 USD
Buy Now
LT3973EDD-5#PBF80
16.25 USD
105.40 USD
503.57 USD
Buy Now
LT3973EDD-5#PBF617
14.41 USD
1003.52 USD
Buy Now
LT3973EDD-5#PBF617
14.41 USD
1003.52 USD
Buy Now
LT3973EDD#PBF145
16.96 USD
1005.45 USD
Buy Now
LT3973EMSE-3.3#PBF465
14.56 USD
1003.57 USD
Buy Now
LT3973EMSE-5#PBF792
17.21 USD
1005.65 USD
Buy Now
LT3973EMSE#PBF474
1005.65 USD
Buy Now
LT3973EMSE#PBF474
1005.65 USD
Buy Now
LT3973IDD-3.3#PBF138
17.67 USD
1006.01 USD
Buy Now
LT3973IDD-5#PBF156
17.67 USD
1005.80 USD
Buy Now
LT3973IMSE-3.3#PBF300
17.95 USD
1006.02 USD
Buy Now
LT3973IMSE-5#PBF458
15.01 USD
1003.92 USD
Buy Now

Conrad (2)

ProductStockPriceBuy
LT3973EMSE-3.3#PBF19Buy Now
LT3973EMSE-5#PBF19Buy Now

Digi-Key (19)

ProductStockPriceBuy
LT3973EDD#PBF1171
15.88 USD
253.93 USD
1003.34 USD
Buy Now
LT3973EMSE-5#PBF771
16.08 USD
254.07 USD
1003.46 USD
Buy Now
LT3973EMSE#PBF746
16.08 USD
254.07 USD
1003.46 USD
Buy Now
LT3973IMSE-5#PBF624
16.68 USD
254.49 USD
1003.81 USD
Buy Now
LT3973EDD-3.3#PBF1361
15.88 USD
253.93 USD
1003.34 USD
Buy Now
LT3973EDD-5#PBF487
15.88 USD
253.93 USD
1003.34 USD
Buy Now
LT3973EMSE-3.3#PBF457
16.08 USD
254.07 USD
1003.46 USD
Buy Now
LT3973IDD#PBF546
16.46 USD
254.33 USD
1003.68 USD
Buy Now
LT3973IDD-5#PBF159
16.46 USD
254.33 USD
1003.68 USD
Buy Now
LT3973IDD-3.3#PBF136
16.46 USD
254.33 USD
1003.68 USD
Buy Now
LT3973IMSE#PBF265
16.68 USD
254.49 USD
1003.81 USD
Buy Now
LT3973IMSE-3.3#PBF206
16.68 USD
254.49 USD
1003.81 USD
Buy Now
LT3973HDD-5#PBF202
17.21 USD
254.83 USD
1004.10 USD
Buy Now
LT3973HMSE-3.3#PBF171
17.44 USD
254.99 USD
1004.24 USD
Buy Now
LT3973HMSE-5#PBF356
17.44 USD
254.99 USD
1004.24 USD
Buy Now
DC2026C12
175.38 USD
Buy Now
DC2026C-KIT5
1125.63 USD
Buy Now
DC1730A2
1100.50 USD
Buy Now
LT3973HDD-3.3#PBF0
17.21 USD
254.83 USD
1004.10 USD
Buy Now
LT3973HMSE#PBF15
17.44 USD
254.99 USD
1004.24 USD
Buy Now
LT3973EDD#TRPBF0
25003.44 USD
Buy Now
LT3973EDD-5#TRPBF0
25003.44 USD
Buy Now
LT3973EDD-3.3#TRPBF0
25003.44 USD
Buy Now
LT3973EMSE#TRPBF0
25003.56 USD
Buy Now
LT3973EMSE-3.3#TRPBF0
25003.56 USD
Buy Now

Distrelec (1)

ProductStockPriceBuy
LT3973IMSE-5#PBF109Buy Now

Element14 (7)

ProductStockPriceBuy
LT3973EDD-3.3#PBF18
19.07 USD
256.06 USD
1005.15 USD
Buy Now
LT3973EDD-5#PBF10
19.07 USD
256.06 USD
1005.15 USD
Buy Now
LT3973EMSE-3.3#PBF215
19.38 USD
256.28 USD
1005.34 USD
Buy Now
LT3973EMSE-5#PBF156
19.38 USD
256.28 USD
1005.34 USD
Buy Now
LT3973EMSE#PBF237
19.38 USD
256.28 USD
1005.34 USD
Buy Now
LT3973IDD-3.3#PBF11
19.95 USD
256.68 USD
1005.68 USD
Buy Now
LT3973IDD-5#PBF88
19.95 USD
256.68 USD
1005.68 USD
Buy Now

Farnell Element14 (7)

ProductStockPriceBuy
LT3973EDD-3.3#PBF18Buy Now
LT3973EDD-5#PBF10Buy Now
LT3973EMSE-3.3#PBF235Buy Now
LT3973EMSE-5#PBF156Buy Now
LT3973EMSE#PBF437Buy Now
LT3973IDD-3.3#PBF11Buy Now
LT3973IDD-5#PBF103Buy Now

RS Components (2)

ProductStockPriceBuy
LT3973EMSE#PBF42Buy Now
LT3973EMSE#PBF34Buy Now

Available Distributors without stock: 1

Newark Electronics (0)

ProductStockPriceBuy
LT3973EDD-3.3#PBF0
15.88 USD
253.95 USD
1003.34 USD
Buy Now
LT3973EDD-5#PBF0
15.88 USD
253.95 USD
1003.34 USD
Buy Now
LT3973EDD#PBF0
15.88 USD
253.95 USD
1003.34 USD
Buy Now
LT3973EMSE#PBF0
16.09 USD
254.09 USD
1003.46 USD
Buy Now
LT3973EMSE#TRPBF0
15.91 USD
25004.24 USD
Buy Now
LT3973HDD-3.3#TRPBF0
17.01 USD
25005.03 USD
Buy Now
LT3973HDD#TRPBF0
17.01 USD
25005.03 USD
Buy Now
LT3973IDD-3.3#PBF0
16.48 USD
254.35 USD
1003.68 USD
Buy Now
LT3973IDD#PBF0
16.48 USD
254.35 USD
1003.68 USD
Buy Now
LT3973IMSE-5#PBF0
16.71 USD
254.50 USD
1003.81 USD
Buy Now
LT3973IMSE#TRPBF0
16.51 USD
25004.67 USD
Buy Now

Available Distributors with stock: 6

Arrow Electronics

ProductStockPriceBuy
LT3973EMSE-5#PBF 792
14.07 $
1003.46 $
Buy Now
LT3973EDD#PBF 629
13.93 $
1003.34 $
Buy Now
LT3973EDD-5#PBF 617
13.93 $
1003.34 $
Buy Now
LT3973EMSE#PBF 474
14.07 $
1003.46 $
Buy Now
LT3973EMSE-3.3#PBF 465
14.07 $
1003.46 $
Buy Now
LT3973IMSE-5#PBF 447
14.49 $
1003.81 $
Buy Now
LT3973IMSE-3.3#PBF 300
14.49 $
1003.81 $
Buy Now
LT3973IDD-5#PBF 156
14.33 $
1003.68 $
Buy Now
LT3973EDD-3.3#PBF 151
13.93 $
1003.34 $
Buy Now
LT3973HMSE-3.3#PBF 50
7004.24 $
Buy Now
LT3973EDD-5#PBF 17
13.93 $
1003.34 $
Buy Now
LT3973EDD-3.3#PBF 0
4843.34 $
Buy Now
LT3973HMSE-3.3#PBF 0
7004.24 $
Buy Now
LT3973IMSE-5#PBF 0
8003.81 $
Buy Now
LT3973EMSE-3.3#PBF 0
8503.46 $
Buy Now
show stock=0hide stock=0

Digi-Key

ProductStockPriceBuy
LT3973EDD-3.3#PBF 1361
1002.83 €
253.33 €
14.99 €
Buy Now
LT3973EDD#PBF 1171
1002.83 €
253.33 €
14.99 €
Buy Now
LT3973EMSE-5#PBF 771
1002.94 €
253.45 €
15.16 €
Buy Now
LT3973EMSE#PBF 746
1002.94 €
253.45 €
15.16 €
Buy Now
LT3973IMSE-5#PBF 624
1003.23 €
253.81 €
15.67 €
Buy Now
LT3973IDD#PBF 546
1003.12 €
253.67 €
15.48 €
Buy Now
LT3973EDD-5#PBF 487
1002.83 €
253.33 €
14.99 €
Buy Now
LT3973EMSE-3.3#PBF 457
1002.94 €
253.45 €
15.16 €
Buy Now
LT3973HMSE-5#PBF 356
1003.60 €
254.23 €
16.31 €
Buy Now
LT3973IMSE#PBF 265
1003.23 €
253.81 €
15.67 €
Buy Now
LT3973IMSE-3.3#PBF 206
1003.23 €
253.81 €
15.67 €
Buy Now
LT3973HDD-5#PBF 202
1003.48 €
254.10 €
16.12 €
Buy Now
LT3973HMSE-3.3#PBF 171
1003.60 €
254.23 €
16.31 €
Buy Now
LT3973IDD-5#PBF 159
1003.12 €
253.67 €
15.48 €
Buy Now
LT3973IDD-3.3#PBF 136
1003.12 €
253.67 €
15.48 €
Buy Now

element14 Asia-Pacific

ProductStockPriceBuy
LT3973EDD-3.3#PBF 18
17.26 $
254.85 $
1004.12 $
Buy Now
LT3973EDD-5#PBF 10
17.26 $
254.85 $
1004.12 $
Buy Now
LT3973EMSE-3.3#PBF 215
17.50 $
255.02 $
1004.27 $
Buy Now
LT3973IDD-5#PBF 88
17.96 $
255.34 $
1004.54 $
Buy Now
LT3973EMSE-5#PBF 156
17.50 $
255.02 $
1004.27 $
Buy Now
LT3973IDD-3.3#PBF 11
17.96 $
255.34 $
1004.54 $
Buy Now
LT3973EMSE#PBF 237
17.50 $
255.02 $
1004.27 $
Buy Now

Farnell element14

ProductStockPriceBuy
LT3973EMSE-3.3#PBF 235
15.11 GBP
253.10 GBP
1002.82 GBP
Buy Now
LT3973IDD-5#PBF 103
15.42 GBP
253.29 GBP
1003.00 GBP
Buy Now
LT3973EMSE-5#PBF 156
15.11 GBP
253.10 GBP
1002.82 GBP
Buy Now
LT3973IDD-3.3#PBF 11
15.42 GBP
253.29 GBP
1003.00 GBP
Buy Now
LT3973EDD-3.3#PBF 18
14.69 GBP
252.84 GBP
1002.58 GBP
Buy Now
LT3973EDD-5#PBF 10
12.96 GBP
252.90 GBP
1002.85 GBP
Buy Now
LT3973EMSE#PBF 437
15.17 GBP
253.14 GBP
1002.82 GBP
Buy Now

Chip1Stop

ProductStockPriceBuy
LT3973EDD-3.3#PBF 151
14.41 $
1003.52 $
Buy Now
LT3973IMSE-5#PBF 458
15.01 $
1003.92 $
Buy Now
LT3973EDD-5#PBF 617
14.41 $
1003.52 $
Buy Now
LT3973EDD-5#PBF 80
16.25 $
105.40 $
503.57 $
Buy Now
LT3973EMSE-3.3#PBF 465
14.56 $
1003.57 $
Buy Now
LT3973IDD-5#PBF 156
17.67 $
1005.80 $
Buy Now
LT3973IMSE-3.3#PBF 300
17.95 $
1006.02 $
Buy Now
LT3973EDD#PBF 145
16.96 $
1005.45 $
Buy Now
LT3973EMSE#PBF 474
1005.65 $
Buy Now
LT3973EMSE-5#PBF 792
17.21 $
1005.65 $
Buy Now

RS Components

ProductStockPriceBuy
LT3973EMSE#PBF 34
104.14 GBP
253.71 GBP
503.53 GBP
753.47 GBP
Buy Now
LT3973EMSE#PBF 42
14.37 GBP
104.14 GBP
253.71 GBP
503.53 GBP
753.47 GBP
Buy Now

Available Distributors without stock: 1

Newark element14

ProductStockPriceBuy
LT3973HDD#TRPBF 0
17.01 $
25005.03 $
Buy Now
LT3973EDD-3.3#PBF 0
15.88 $
253.95 $
1003.34 $
Buy Now
LT3973IMSE-5#PBF 0
16.71 $
254.50 $
1003.81 $
Buy Now
LT3973IMSE#TRPBF 0
16.51 $
25004.67 $
Buy Now
LT3973IDD#PBF 0
16.48 $
254.35 $
1003.68 $
Buy Now
LT3973EMSE#TRPBF 0
15.91 $
25004.24 $
Buy Now
LT3973EDD-5#PBF 0
15.88 $
253.95 $
1003.34 $
Buy Now
LT3973EDD#PBF 0
15.88 $
253.95 $
1003.34 $
Buy Now
LT3973EMSE#PBF 0
16.09 $
254.09 $
1003.46 $
Buy Now
LT3973HDD-3.3#TRPBF 0
17.01 $
25005.03 $
Buy Now
LT3973IDD-3.3#PBF 0
16.48 $
254.35 $
1003.68 $
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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