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: 8

Chip One Stop (2)

ProductStockPriceBuy
LT3973EDD-5#PBF80
13.42 USD
Buy Now
LT3973EMSE#PBF50
16.43 USD
106.06 USD
506.00 USD
Buy Now

Conrad COM (2)

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

Conrad UK (2)

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

Digi-Key (16)

ProductStockPriceBuy
LT3973EDD#PBF19
16.00 USD
254.01 USD
1003.41 USD
Buy Now
LT3973EMSE#PBF1754
16.20 USD
254.15 USD
1003.53 USD
Buy Now
LT3973IMSE-5#PBF294
16.82 USD
254.58 USD
1003.89 USD
Buy Now
LT3973EDD-3.3#PBF1081
16.00 USD
254.01 USD
1003.41 USD
Buy Now
LT3973EDD-5#PBF284
16.00 USD
254.01 USD
1003.41 USD
Buy Now
LT3973EMSE-3.3#PBF174
16.20 USD
254.15 USD
1003.53 USD
Buy Now
LT3973IDD-3.3#PBF549
16.59 USD
254.42 USD
1003.75 USD
Buy Now
LT3973IDD#PBF162
16.59 USD
254.42 USD
1003.75 USD
Buy Now
LT3973IMSE#PBF82
16.82 USD
254.58 USD
1003.89 USD
Buy Now
LT3973EMSE-5#PBF0
16.20 USD
254.15 USD
1003.53 USD
Buy Now
LT3973IDD-5#PBF81
16.59 USD
254.42 USD
1003.75 USD
Buy Now
LT3973IMSE-3.3#PBF254
16.82 USD
254.58 USD
1003.89 USD
Buy Now
LT3973HDD-3.3#PBF244
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-5#PBF283
17.59 USD
255.09 USD
1004.32 USD
Buy Now
DC1730A3
1100.50 USD
Buy Now
LT3973HMSE-3.3#PBF65
17.59 USD
255.09 USD
1004.32 USD
Buy Now
DC2026C0
175.38 USD
Buy Now
DC2026C-KIT0
1125.63 USD
Buy Now
LT3973EDD#TRPBF0
25003.51 USD
Buy Now
LT3973EDD#TRPBF0
16.86 USD
256.12 USD
1004.21 USD
2503.86 USD
Buy Now
LT3973EDD#TRPBF0
16.86 USD
256.12 USD
1004.21 USD
2503.86 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

Distrelec (1)

ProductStockPriceBuy
LT3973IMSE-5#PBF109Buy Now

Element14 (1)

ProductStockPriceBuy
LT3973EMSE-3.3#PBF52
19.68 USD
256.48 USD
1005.51 USD
Buy Now

Farnell Element14 (4)

ProductStockPriceBuy
LT3973EDD-3.3#PBF0Buy Now
LT3973EDD-5#PBF0Buy Now
LT3973EMSE-3.3#PBF58Buy Now
LT3973EMSE-5#PBF5Buy Now
LT3973EMSE#PBF17Buy Now
LT3973IDD-3.3#PBF10Buy Now
LT3973IDD-5#PBF0Buy Now
LT3973IMSE-3.3#PBF0Buy Now
LT3973IMSE-5#PBF0Buy Now

RS Components (2)

ProductStockPriceBuy
LT3973EMSE#PBF32Buy Now
LT3973EMSE#PBF12Buy Now

Available Distributors with stock: 7

Arrow Electronics

ProductStockPriceBuy
LT3973EMSE-3.3#PBF 355
14.07 $
1003.46 $
Buy Now
LT3973EMSE#PBF 320
14.07 $
1003.46 $
Buy Now
LT3973IMSE-5#PBF 277
14.49 $
1003.81 $
Buy Now
LT3973HDD#PBF 183
14.83 $
1004.10 $
Buy Now
LT3973HMSE-3.3#PBF 50
14.99 $
1004.24 $
Buy Now
LT3973IDD-5#PBF 40
14.33 $
1003.68 $
Buy Now
LT3973IMSE-3.3#PBF 35
14.49 $
1003.81 $
Buy Now
LT3973EDD-5#PBF 17
13.93 $
1003.34 $
Buy Now
LT3973EDD-5#PBF 0
13.93 $
1003.34 $
Buy Now
LT3973HMSE-3.3#PBF 0
14.99 $
1004.24 $
Buy Now
LT3973IMSE-5#PBF 0
14.49 $
1003.81 $
Buy Now
LT3973HDD#PBF 0
14.83 $
1004.10 $
Buy Now
LT3973EMSE-3.3#PBF 0
14.07 $
1003.46 $
Buy Now
LT3973EMSE#PBF 0
14.07 $
1003.46 $
Buy Now
LT3973IDD-5#TRPBF 0
1003.78 $
Buy Now
show stock=0hide stock=0

Digi-Key

ProductStockPriceBuy
LT3973EMSE#PBF 1754
1002.86 €
253.36 €
15.02 €
Buy Now
LT3973EDD-3.3#PBF 1081
1002.76 €
253.25 €
14.86 €
Buy Now
LT3973IDD-3.3#PBF 549
1003.04 €
253.58 €
15.34 €
Buy Now
LT3973IMSE-5#PBF 294
1003.15 €
253.71 €
15.53 €
Buy Now
LT3973EDD-5#PBF 284
1002.76 €
253.25 €
14.86 €
Buy Now
LT3973HMSE-5#PBF 283
1003.50 €
254.12 €
16.15 €
Buy Now
LT3973IMSE-3.3#PBF 254
1003.15 €
253.71 €
15.53 €
Buy Now
LT3973HDD-3.3#PBF 244
1003.39 €
253.99 €
15.96 €
Buy Now
LT3973HDD-5#PBF 197
1003.39 €
253.99 €
15.96 €
Buy Now
LT3973EMSE-3.3#PBF 174
1002.86 €
253.36 €
15.02 €
Buy Now
LT3973IDD#PBF 162
1003.04 €
253.58 €
15.34 €
Buy Now
LT3973IMSE#PBF 82
1003.15 €
253.71 €
15.53 €
Buy Now
LT3973IDD-5#PBF 81
1003.04 €
253.58 €
15.34 €
Buy Now
LT3973EDD#PBF 19
1002.76 €
253.25 €
14.86 €
Buy Now
LT3973EMSE-5#PBF 0
1002.86 €
253.36 €
15.02 €
Buy Now
show stock=0hide stock=0

Mouser Electronics

ProductStockPriceBuy
LT3973EDD#PBF 217
16.01 $
105.51 $
254.01 $
1003.41 $
Buy Now
LT3973EDD-5#PBF 182
16.01 $
105.51 $
254.01 $
1003.41 $
Buy Now
LT3973EMSE-3.3#PBF 100
16.21 $
105.69 $
254.15 $
1003.53 $
Buy Now
LT3973EMSE#PBF 0
16.21 $
105.69 $
254.15 $
1003.53 $
Buy Now
LT3973IDD#PBF 0
2423.75 $
Buy Now
LT3973IMSE-5#PBF 0
2003.89 $
Buy Now
LT3973EMSE#TRPBF 0
25003.63 $
Buy Now
LT3973EDD-3.3#PBF 0
2423.41 $
Buy Now
LT3973HDD#PBF 0
2424.18 $
Buy Now
LT3973EMSE-5#TRPBF 0
25003.63 $
Buy Now
LT3973HDD#TRPBF 0
25004.28 $
Buy Now
LT3973HMSE-5#TRPBF 0
25004.43 $
Buy Now
LT3973IMSE#PBF 0
2003.89 $
Buy Now
LT3973IMSE-3.3#PBF 0
2003.89 $
Buy Now
LT3973EMSE-5#PBF 0
2503.53 $
Buy Now
show stock=0hide stock=0

element14 Asia-Pacific

ProductStockPriceBuy
LT3973EMSE-3.3#PBF 52
17.74 $
255.18 $
1004.40 $
Buy Now

Farnell element14

ProductStockPriceBuy
LT3973EMSE-5#PBF 5
15.13 GBP
104.65 GBP
254.28 GBP
503.11 GBP
1003.01 GBP
Buy Now
LT3973EMSE-3.3#PBF 58
15.13 GBP
104.65 GBP
254.28 GBP
503.11 GBP
1003.01 GBP
Buy Now
LT3973IDD-3.3#PBF 10
15.44 GBP
104.94 GBP
253.04 GBP
503.03 GBP
1003.02 GBP
Buy Now
LT3973EMSE#PBF 17
15.13 GBP
104.65 GBP
254.28 GBP
503.11 GBP
1003.01 GBP
Buy Now

Chip1Stop

ProductStockPriceBuy
LT3973EDD-5#PBF 80
13.42 $
Buy Now
LT3973EMSE#PBF 50
506.00 $
106.06 $
16.43 $
Buy Now

RS Components

ProductStockPriceBuy
LT3973EMSE#PBF 12
104.97 GBP
254.45 GBP
504.24 GBP
754.16 GBP
Buy Now
LT3973EMSE#PBF 32
15.24 GBP
104.97 GBP
254.45 GBP
504.24 GBP
754.16 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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