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 (11)

ProductStockPriceBuy
LT3973EDD-3.3#PBF617
14.38 USD
1003.49 USD
Buy Now
LT3973EDD-5#PBF80
17.35 USD
104.31 USD
503.61 USD
Buy Now
LT3973EDD-5#PBF82
16.96 USD
Buy Now
LT3973EDD-5#PBF82
16.96 USD
Buy Now
LT3973EDD#PBF977
16.96 USD
1005.45 USD
Buy Now
LT3973EMSE-3.3#PBF465
14.55 USD
1003.56 USD
Buy Now
LT3973EMSE-5#PBF608
17.21 USD
1005.50 USD
Buy Now
LT3973IDD-3.3#PBF107
17.66 USD
1006.00 USD
Buy Now
LT3973IDD-5#PBF156
17.66 USD
1005.80 USD
Buy Now
LT3973IMSE-3.3#PBF45
17.95 USD
Buy Now
LT3973IMSE-5#PBF428
14.98 USD
1003.90 USD
Buy Now

Conrad (2)

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

Digi-Key (19)

ProductStockPriceBuy
LT3973EDD#PBF1640
16.00 USD
254.01 USD
1003.41 USD
Buy Now
LT3973IMSE-5#PBF184
16.82 USD
254.58 USD
1003.89 USD
Buy Now
LT3973EDD-3.3#PBF1180
16.00 USD
254.01 USD
1003.41 USD
Buy Now
LT3973EDD-5#PBF127
16.00 USD
254.01 USD
1003.41 USD
Buy Now
LT3973EMSE-5#PBF751
16.20 USD
254.15 USD
1003.53 USD
Buy Now
LT3973EMSE-3.3#PBF457
16.20 USD
254.15 USD
1003.53 USD
Buy Now
LT3973IDD#PBF385
16.59 USD
254.42 USD
1003.75 USD
Buy Now
LT3973IDD-3.3#PBF220
16.59 USD
254.42 USD
1003.75 USD
Buy Now
LT3973IMSE#PBF216
16.82 USD
254.58 USD
1003.89 USD
Buy Now
LT3973IDD-5#PBF159
16.59 USD
254.42 USD
1003.75 USD
Buy Now
LT3973IMSE-3.3#PBF256
16.82 USD
254.58 USD
1003.89 USD
Buy Now
LT3973HDD-3.3#PBF360
17.36 USD
254.93 USD
1004.18 USD
Buy Now
LT3973HDD-5#PBF197
17.36 USD
254.93 USD
1004.18 USD
Buy Now
LT3973HMSE-3.3#PBF171
17.59 USD
255.09 USD
1004.32 USD
Buy Now
LT3973HMSE-5#PBF283
17.59 USD
255.09 USD
1004.32 USD
Buy Now
DC2026C7
176.50 USD
Buy Now
DC2026C-KIT9
1127.50 USD
Buy Now
DC1730A2
1102.00 USD
Buy Now
LT3973EMSE#PBF0
16.20 USD
254.15 USD
1003.53 USD
Buy Now
LT3973HMSE#PBF15
17.59 USD
255.09 USD
1004.32 USD
Buy Now
LT3973EDD#TRPBF0
25003.51 USD
Buy Now
LT3973EDD-5#TRPBF0
25003.51 USD
Buy Now
LT3973EDD-3.3#TRPBF0
25003.51 USD
Buy Now
LT3973EMSE#TRPBF0
25003.63 USD
Buy Now
LT3973EMSE-3.3#TRPBF0
25003.63 USD
Buy Now

Distrelec (1)

ProductStockPriceBuy
LT3973IMSE-5#PBF109Buy Now

Element14 (6)

ProductStockPriceBuy
LT3973EDD-3.3#PBF3
19.25 USD
256.18 USD
1005.25 USD
Buy Now
LT3973EDD-5#PBF6
19.25 USD
256.18 USD
1005.25 USD
Buy Now
LT3973EMSE-3.3#PBF182
19.56 USD
256.40 USD
1005.44 USD
Buy Now
LT3973EMSE-5#PBF73
19.56 USD
256.40 USD
1005.44 USD
Buy Now
LT3973EMSE#PBF0
19.56 USD
256.40 USD
1005.44 USD
Buy Now
LT3973IDD-3.3#PBF11
110.15 USD
256.81 USD
1005.79 USD
Buy Now
LT3973IDD-5#PBF79
110.15 USD
256.81 USD
1005.79 USD
Buy Now

Farnell Element14 (7)

ProductStockPriceBuy
LT3973EDD-3.3#PBF3Buy Now
LT3973EDD-5#PBF6Buy Now
LT3973EMSE-3.3#PBF182Buy Now
LT3973EMSE-5#PBF112Buy Now
LT3973EMSE#PBF140Buy Now
LT3973IDD-3.3#PBF11Buy Now
LT3973IDD-5#PBF94Buy Now

RS Components (2)

ProductStockPriceBuy
LT3973EMSE#PBF32Buy 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
LT3973EDD-3.3#PBF 617
13.93 $
1003.34 $
Buy Now
LT3973EMSE-5#PBF 548
14.07 $
1003.46 $
Buy Now
LT3973EMSE-3.3#PBF 465
14.07 $
1003.46 $
Buy Now
LT3973IMSE-5#PBF 428
14.49 $
1003.81 $
Buy Now
LT3973IDD-5#PBF 156
14.33 $
1003.68 $
Buy Now
LT3973IDD-3.3#PBF 107
14.33 $
1003.68 $
Buy Now
LT3973EDD-5#PBF 82
13.93 $
1003.34 $
Buy Now
LT3973HMSE-3.3#PBF 50
7004.24 $
Buy Now
LT3973IMSE-3.3#PBF 45
14.49 $
1003.81 $
Buy Now
LT3973EDD-5#PBF 17
13.93 $
1003.34 $
Buy Now
LT3973HMSE-3.3#PBF 0
7004.24 $
Buy Now
LT3973EDD-3.3#PBF 0
4843.34 $
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#PBF 1640
1002.85 €
253.36 €
15.02 €
Buy Now
LT3973EDD-3.3#PBF 1180
1002.85 €
253.36 €
15.02 €
Buy Now
LT3973EMSE-5#PBF 751
1002.95 €
253.47 €
15.19 €
Buy Now
LT3973EMSE-3.3#PBF 457
1002.95 €
253.47 €
15.19 €
Buy Now
LT3973IDD#PBF 385
1003.14 €
253.70 €
15.52 €
Buy Now
LT3973HDD-3.3#PBF 360
1003.50 €
254.12 €
16.16 €
Buy Now
LT3973HMSE-5#PBF 283
1003.62 €
254.26 €
16.35 €
Buy Now
LT3973IMSE-3.3#PBF 256
1003.25 €
253.83 €
15.71 €
Buy Now
LT3973IDD-3.3#PBF 220
1003.14 €
253.70 €
15.52 €
Buy Now
LT3973IMSE#PBF 216
1003.25 €
253.83 €
15.71 €
Buy Now
LT3973HDD-5#PBF 197
1003.50 €
254.12 €
16.16 €
Buy Now
LT3973IMSE-5#PBF 184
1003.25 €
253.83 €
15.71 €
Buy Now
LT3973HMSE-3.3#PBF 171
1003.62 €
254.26 €
16.35 €
Buy Now
LT3973IDD-5#PBF 159
1003.14 €
253.70 €
15.52 €
Buy Now
LT3973EDD-5#PBF 127
1002.85 €
253.36 €
15.02 €
Buy Now

element14 Asia-Pacific

ProductStockPriceBuy
LT3973EMSE#PBF 0
17.65 $
255.12 $
1004.35 $
Buy Now
LT3973EMSE-3.3#PBF 182
17.65 $
255.12 $
1004.35 $
Buy Now
LT3973EDD-5#PBF 6
17.40 $
254.94 $
1004.20 $
Buy Now
LT3973EMSE-5#PBF 73
17.65 $
255.12 $
1004.35 $
Buy Now
LT3973IDD-3.3#PBF 11
18.12 $
255.45 $
1004.63 $
Buy Now
LT3973EDD-3.3#PBF 3
17.40 $
254.94 $
1004.20 $
Buy Now
LT3973IDD-5#PBF 79
18.12 $
255.45 $
1004.63 $
Buy Now
show stock=0hide stock=0

Farnell element14

ProductStockPriceBuy
LT3973EMSE#PBF 140
15.17 GBP
253.14 GBP
1002.82 GBP
Buy Now
LT3973EMSE-3.3#PBF 182
15.11 GBP
253.10 GBP
1002.82 GBP
Buy Now
LT3973EDD-5#PBF 6
14.94 GBP
252.99 GBP
1002.72 GBP
Buy Now
LT3973EMSE-5#PBF 112
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 3
14.69 GBP
252.84 GBP
1002.58 GBP
Buy Now
LT3973IDD-5#PBF 94
15.42 GBP
253.29 GBP
1003.00 GBP
Buy Now

Chip1Stop

ProductStockPriceBuy
LT3973EMSE-3.3#PBF 465
14.55 $
1003.56 $
Buy Now
LT3973IMSE-3.3#PBF 45
17.95 $
Buy Now
LT3973IMSE-5#PBF 428
14.98 $
1003.90 $
Buy Now
LT3973IDD-3.3#PBF 107
17.66 $
1006.00 $
Buy Now
LT3973EDD-3.3#PBF 617
14.38 $
1003.49 $
Buy Now
LT3973IDD-5#PBF 156
17.66 $
1005.80 $
Buy Now
LT3973EDD#PBF 977
16.96 $
1005.45 $
Buy Now
LT3973EDD-5#PBF 80
17.35 $
104.31 $
503.61 $
Buy Now
LT3973EDD-5#PBF 82
16.96 $
Buy Now
LT3973EMSE-5#PBF 608
17.21 $
1005.50 $
Buy Now

RS Components

ProductStockPriceBuy
LT3973EMSE#PBF 32
14.37 GBP
104.14 GBP
253.71 GBP
503.53 GBP
753.47 GBP
Buy Now
LT3973EMSE#PBF 34
104.14 GBP
253.71 GBP
503.53 GBP
753.47 GBP
Buy Now

Available Distributors without stock: 1

Newark element14

ProductStockPriceBuy
LT3973EMSE#PBF 0
16.09 $
254.09 $
1003.46 $
Buy Now
LT3973EDD-5#PBF 0
15.88 $
253.95 $
1003.34 $
Buy Now
LT3973IMSE-5#PBF 0
16.71 $
254.50 $
1003.81 $
Buy Now
LT3973HDD-3.3#TRPBF 0
17.01 $
25005.03 $
Buy Now
LT3973IDD#PBF 0
16.48 $
254.35 $
1003.68 $
Buy Now
LT3973EDD#PBF 0
15.88 $
253.95 $
1003.34 $
Buy Now
LT3973IDD-3.3#PBF 0
16.48 $
254.35 $
1003.68 $
Buy Now
LT3973HDD#TRPBF 0
17.01 $
25005.03 $
Buy Now
LT3973EDD-3.3#PBF 0
15.88 $
253.95 $
1003.34 $
Buy Now
LT3973IMSE#TRPBF 0
16.51 $
25004.67 $
Buy Now
LT3973EMSE#TRPBF 0
15.91 $
25004.24 $
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
0Results
Module
Fresh Search
Replacement Search with
0% tolerance (0)
10% tolerance (0)
25% tolerance (0)
50% tolerance (0)
add to Compare
Last Tweets
Meet us at this weeks PCIM tradeshow in Nuremberg, Tue+Wed, Details under info@dcdcselector.com
With the help of #OEMsecrets we show for all Selectors and products worldwide distributor inventory and prices. https://t.co/udaDPmshky
Update for the DC/DC Buck-Boost Converter Selector with additional products, fresh equivalent suggestions and more: https://t.co/C8PXhcizYQ
Feedback
ajax-loader.gif
Loading. Please wait.