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: 6

ARROW-NAC (10)

ProductStockPriceBuy
LT3973IMSE-3.3#PBF300
14.49 USD
1003.81 USD
Buy Now
LT3973EMSE#PBF123
14.07 USD
1003.46 USD
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LT3973EDD-5#PBF27
13.93 USD
1003.34 USD
Buy Now
LT3973EDD#PBF718
13.93 USD
1003.34 USD
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LT3973IDD-5#PBF156
14.33 USD
1003.68 USD
Buy Now
LT3973EDD-3.3#PBF484
13.93 USD
1003.34 USD
Buy Now
LT3973EDD-3.3#TRPBF5000
25003.39 USD
Buy Now
LT3973IMSE-5#PBF458
14.49 USD
1003.81 USD
Buy Now
LT3973IDD-3.3#PBF363
14.33 USD
1003.68 USD
Buy Now
LT3973EMSE-3.3#PBF465
14.07 USD
1003.46 USD
Buy Now

Chip-One-Stop (14)

ProductStockPriceBuy
LT3973EDD-3.3#PBF484
13.89 USD
103.23 USD
2003.12 USD
Buy Now
LT3973EDD-5#PBF112
15.29 USD
503.53 USD
1003.35 USD
Buy Now
LT3973EDD-5#PBF128
14.04 USD
103.44 USD
Buy Now
LT3973EDD#PBF728
16.38 USD
105.37 USD
255.31 USD
505.06 USD
1004.94 USD
2004.71 USD
Buy Now
LT3973EMSE-3.3#PBF550
14.07 USD
103.46 USD
2003.34 USD
5003.07 USD
Buy Now
LT3973EMSE-5#PBF970
16.72 USD
105.66 USD
255.59 USD
505.33 USD
1005.21 USD
2004.97 USD
Buy Now
LT3973EMSE#PBF834
16.72 USD
105.66 USD
255.59 USD
505.33 USD
1005.21 USD
2004.97 USD
Buy Now
LT3973EMSE#PBF834
16.72 USD
105.66 USD
255.59 USD
505.33 USD
1005.21 USD
2004.97 USD
Buy Now
LT3973EMSE#TRPBF2500
25003.76 USD
Buy Now
LT3973IDD-3.3#PBF970
16.61 USD
105.56 USD
255.50 USD
505.25 USD
1005.12 USD
2004.88 USD
Buy Now
LT3973IDD-5#PBF189
16.85 USD
105.76 USD
255.70 USD
505.44 USD
1005.31 USD
Buy Now
LT3973IMSE-3.3#PBF324
17.27 USD
56.21 USD
106.06 USD
505.72 USD
1005.39 USD
2005.27 USD
Buy Now
LT3973IMSE-5#PBF734
14.44 USD
254.26 USD
503.90 USD
1003.60 USD
2003.46 USD
5003.22 USD
Buy Now
LT3973IMSE#PBF5
17.27 USD
56.21 USD
Buy Now

DIGI-KEY (18)

ProductStockPriceBuy
LT3973EDD#PBF641
15.88 USD
253.93 USD
1003.34 USD
Buy Now
LT3973EDD-5#PBF258
15.88 USD
253.93 USD
1003.34 USD
Buy Now
LT3973EMSE#PBF1101
16.08 USD
254.07 USD
1003.46 USD
Buy Now
LT3973EMSE-5#PBF841
16.08 USD
254.07 USD
1003.46 USD
Buy Now
LT3973IMSE-5#PBF691
16.68 USD
254.49 USD
1003.81 USD
Buy Now
LT3973EDD-3.3#PBF1716
15.88 USD
253.93 USD
1003.34 USD
Buy Now
LT3973EMSE-3.3#PBF695
16.08 USD
254.07 USD
1003.46 USD
Buy Now
LT3973IDD#PBF202
16.46 USD
254.33 USD
1003.68 USD
Buy Now
LT3973IDD-3.3#PBF423
16.46 USD
254.33 USD
1003.68 USD
Buy Now
LT3973IDD-5#PBF166
16.46 USD
254.33 USD
1003.68 USD
Buy Now
LT3973IMSE-3.3#PBF506
16.68 USD
254.49 USD
1003.81 USD
Buy Now
LT3973HDD-3.3#PBF211
17.21 USD
254.83 USD
1004.10 USD
Buy Now
LT3973HDD-5#PBF202
17.21 USD
254.83 USD
1004.10 USD
Buy Now
LT3973HMSE-3.3#PBF173
17.44 USD
254.99 USD
1004.24 USD
Buy Now
LT3973IMSE#PBF27
16.68 USD
254.49 USD
1003.81 USD
Buy Now
DC1730A2
1100.50 USD
Buy Now
LT3973HMSE-5#PBF31
17.44 USD
254.99 USD
1004.24 USD
Buy Now
DC2026C0
175.38 USD
Buy Now
DC2026C-KIT0
1125.63 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

Element14 (7)

ProductStockPriceBuy
LT3973EDD-3.3#PBF15
19.34 USD
256.24 USD
1005.30 USD
Buy Now
LT3973EDD-5#PBF30
19.34 USD
256.24 USD
1005.30 USD
Buy Now
LT3973EMSE-3.3#PBF230
19.65 USD
256.46 USD
1005.49 USD
Buy Now
LT3973EMSE-5#PBF6
19.65 USD
256.46 USD
1005.49 USD
Buy Now
LT3973EMSE#PBF918
19.65 USD
256.46 USD
1005.49 USD
Buy Now
LT3973IDD-3.3#PBF11
110.25 USD
256.87 USD
1005.84 USD
Buy Now
LT3973IDD-5#PBF106
110.25 USD
256.87 USD
1005.84 USD
Buy Now

FARNELL-ELEMENT14 (7)

ProductStockPriceBuy
LT3973EDD-3.3#PBF15Buy Now
LT3973EDD-5#PBF30Buy Now
LT3973EMSE-3.3#PBF300Buy Now
LT3973EMSE-5#PBF26Buy Now
LT3973EMSE#PBF956Buy Now
LT3973IDD-3.3#PBF11Buy Now
LT3973IDD-5#PBF123Buy Now

RS-COMPONENTS (2)

ProductStockPriceBuy
LT3973EMSE#PBF64Buy Now
LT3973EMSE#PBF34Buy Now

Available Distributors without stock: 1

NEWARK (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
3.95100.00 USD
5.8825.00 USD
Buy Now
LT3973EMSE#PBF0
4.09100.00 USD
6.0925.00 USD
Buy Now
LT3973EMSE#TRPBF0
5.912,500.00 USD
Buy Now
LT3973HDD-3.3#TRPBF0
17.01 USD
25005.03 USD
Buy Now
LT3973HDD#TRPBF0
7.012,500.00 USD
Buy Now
LT3973IDD-3.3#PBF0
16.48 USD
254.35 USD
1003.68 USD
Buy Now
LT3973IDD#PBF0
4.35100.00 USD
6.4825.00 USD
Buy Now
LT3973IMSE-5#PBF0
16.71 USD
254.50 USD
1003.81 USD
Buy Now
LT3973IMSE#TRPBF0
6.512,500.00 USD
Buy Now

Available Distributors with stock: 0

no online Distributor with LT3973 stock available

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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