LT3991-5.0 Buck Converter overview

Description

Manufacturer
 
Category
Sub-Category

LT3991-5.0 is a 55.00 V non-sync Buck Converter from with 1.20 A output current. The maximum 55.00 V input voltage can be regulated down into a 5.00 V to 5.00 V output voltage.

It requires are a typical inductor size of 12.00 µH, a typical external component count of 6 and achieves a peak efficiency of 89 %. Further LT3991-5.0 characteristics are a adjustable 1000 kHz switching frequency and 2 available package option(s): MSOP-10 DFN-10 .

For the LT3991-5.0 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. 4.30 V
V-IN max. 55.00 V
I-OUT? 1.20 A
V-OUT min. 5.00 V
V-OUT max. 5.00 V
V-OUT 5.000 V
V-OUT programmable no
sync/non-sync non-sync
Frequency typ. 1000 kHz
Frequency adjustable
Frequency selectable
ext.clock sync. yes
Frequency adj./ ext.clock min. 200 kHz
Frequency adj./ ext.clock max 2200 kHz
Softstart yes
Softstart adjustable yes
Tracking no
PG/Power OK yes
Quiescent current max. 4.5 µA
Operating min.
Operating max.
Junction min. -40 °C
Junction max. 125 °C
thermal shutdown typ.
Inductor size typ. 12.00 µH
Inductor suggested by Würth Elektronik
Automotive AEC-Q100 no
Light-Load-Mode yes
Topology Buck
Peak Efficiency 89 %
Component count min. 6
current limit adjustable no
Nr.of packages 2
CSP
SC70
SOT
MSOP MSOP-10
QFN/DFN DFN-10
SO/SOIC
SOP
DIP
TO
DDPAK

LT3991-5.0 Datasheet

Link to the most up-to-date LT3991-5.0 datasheet and the product page for EVM, tools and support information.

LT3991-5.0

LT3991-5.0 Sample stock and distributor price breaks

LT3991-5.0 prices and online available distributors.

OEMSecrets.com
findchips.com

Available Distributors with stock: 0

no online Distributor with LT3991 stock available

Available Distributors with stock: 8

Arrow Electronics

ProductStockPriceBuy
LT3991EMSE-3.3#PBF 542
2503.63 $
1003.72 $
254.49 $
16.77 $
Buy Now
LT3991EMSE-5#PBF 353
10003.32 $
5003.45 $
2503.52 $
1003.58 $
254.49 $
16.77 $
Buy Now
LT3991IMSE-5#PBF 240
2504.05 $
1004.14 $
255.01 $
17.55 $
Buy Now
LT3991IMSE-3.3#PBF 208
1003.98 $
14.69 $
Buy Now
LT3991IMSE#PBF 205
10003.70 $
5003.85 $
2503.93 $
1003.98 $
255.01 $
17.55 $
Buy Now
LT3991IDD#PBF 45
10003.70 $
5003.85 $
2503.93 $
1003.98 $
255.01 $
17.55 $
Buy Now
LT3991EMSE-5#PBF 1
2503.63 $
1003.72 $
254.49 $
16.77 $
Buy Now
LT3991IDD#PBF 0
2504.05 $
1004.14 $
255.01 $
17.55 $
Buy Now
LT3991IMSE-5#PBF 0
10003.70 $
5003.85 $
2503.93 $
1503.98 $
Buy Now
LT3991IMSE#PBF 0
2504.05 $
1504.14 $
Buy Now
LT3991IMSE-3.3#TRPBF 0
25004.08 $
Buy Now
LT3991IMSE-5#TRPBF 0
25004.08 $
Buy Now
LT3991EMSE-5#TRPBF 0
25003.68 $
Buy Now
LT3991IMSE#TRPBF 0
25003.75 $
Buy Now
LT3991IDD#TRPBF 0
25004.08 $
Buy Now
show stock=0hide stock=0

Digi-Key

ProductStockPriceBuy
LT3991EMSE#PBF 7479
5003.31 €
2503.39 €
1003.57 €
254.31 €
16.50 €
Buy Now
LT3991EMSE-3.3#PBF 5108
5003.31 €
2503.39 €
1003.57 €
254.31 €
16.50 €
Buy Now
LT3991EMSE#TRPBF 5000
25003.38 €
Buy Now
LT3991EMSE#TRPBF 5000
5003.48 €
2503.56 €
1003.75 €
255.02 €
16.83 €
Buy Now
LT3991EMSE#TRPBF 5000
5003.48 €
2503.56 €
1003.75 €
255.02 €
16.83 €
Buy Now
LT3991EMSE-5#PBF 1753
5003.31 €
2503.39 €
1003.57 €
254.31 €
16.50 €
Buy Now
LT3991EMSE-3.3#TRPBF 1413
5003.48 €
2503.56 €
1003.75 €
255.02 €
16.83 €
Buy Now
LT3991EMSE-3.3#TRPBF 1413
5003.48 €
2503.56 €
1003.75 €
255.02 €
16.83 €
Buy Now
LT3991EDD#TRPBF 646
5003.48 €
2503.56 €
1003.75 €
255.02 €
16.83 €
Buy Now
LT3991EDD#TRPBF 646
5003.48 €
2503.56 €
1003.75 €
255.02 €
16.83 €
Buy Now
LT3991IDD#PBF 628
5003.69 €
2503.78 €
1003.97 €
254.81 €
17.24 €
Buy Now
LT3991IMSE#PBF 511
5003.69 €
2503.78 €
1003.97 €
254.81 €
17.24 €
Buy Now
LT3991IMSE-5#PBF 333
5003.69 €
2503.78 €
1003.97 €
254.81 €
17.24 €
Buy Now
LT3991EMSE-3.3#TRPBF 0
25003.38 €
Buy Now
LT3991EDD#TRPBF 0
25003.38 €
Buy Now
show stock=0hide stock=0

Verical

ProductStockPriceBuy
LT3991EMSE-3.3#PBF 542
2503.63 $
1003.72 $
254.49 $
26.77 $
Buy Now
LT3991EMSE-5#PBF 353
10003.32 $
5003.45 $
2503.52 $
1003.58 $
254.49 $
26.77 $
Buy Now
LT3991IMSE-5#PBF 240
2504.05 $
1004.14 $
255.01 $
27.55 $
Buy Now
LT3991IMSE-3.3#PBF 208
1003.98 $
24.69 $
Buy Now
LT3991IMSE#PBF 205
10003.70 $
5003.85 $
2503.93 $
1003.98 $
255.01 $
27.55 $
Buy Now
LT3991IDD#PBF 78
2504.05 $
1004.14 $
255.01 $
27.55 $
Buy Now
LT3991EMSE#PBF 7
10003.32 $
5003.45 $
2503.52 $
1003.58 $
254.49 $
26.77 $
Buy Now

Mouser Electronics

ProductStockPriceBuy
LT3991IMSE#TRPBF 2305
18.32 $
255.52 $
1004.56 $
2504.33 $
5004.24 $
25003.95 $
Buy Now
LT3991EMSE#PBF 3165
17.13 $
254.73 $
1003.91 $
2503.71 $
5003.63 $
10003.49 $
Buy Now
LT3991EDD#PBF 567
17.13 $
254.73 $
1003.91 $
2503.71 $
5003.63 $
10003.49 $
Buy Now
LT3991EMSE#TRPBF 2500
17.51 $
254.98 $
1004.12 $
2503.91 $
5003.82 $
25003.57 $
Buy Now
LT3991EMSE-3.3#PBF 206
17.13 $
254.73 $
1003.91 $
2503.71 $
5003.63 $
10003.49 $
Buy Now
LT3991EMSE-5#PBF 330
17.13 $
254.73 $
1003.91 $
2503.71 $
5003.63 $
10003.49 $
Buy Now
LT3991IDD#PBF 153
17.95 $
255.27 $
1004.36 $
2504.14 $
5004.05 $
10003.89 $
Buy Now
LT3991IMSE-5#PBF 110
17.95 $
255.27 $
1004.36 $
2504.14 $
5004.05 $
10003.89 $
Buy Now
LT3991IMSE#PBF 172
17.95 $
255.27 $
1004.36 $
2504.14 $
5004.05 $
10003.89 $
Buy Now

Bristol Electronics

ProductStockPriceBuy
LT3991EMSE-3.3#PBF 35 Buy Now
LT3991IDD#PBF 75 Buy Now

Quest Components

ProductStockPriceBuy
LT3991EMSE-3.3#TRPBF 1975
2636.93 $
1187.62 $
113.86 $
Buy Now

RS Components

ProductStockPriceBuy
LT3991IMSE#PBF 30
265.18 GBP
Buy Now
LT3991EMSE#PBF 8
254.34 GBP
104.80 GBP
15.26 GBP
Buy Now
LT3991EMSE#PBF 160
254.34 GBP
104.80 GBP
Buy Now
LT3991EMSE#PBF 50
5003.33 GBP
2503.37 GBP
503.74 GBP
Buy Now

ComS.I.T.

ProductStockPriceBuy
LT3991EMSE 20

Available Distributors without stock: 2

element14 Asia-Pacific

ProductStockPriceBuy
LT3991EMSE#PBF 0
5005.45 SGD
2505.58 SGD
1005.87 SGD
257.10 SGD
110.68 SGD
Buy Now
LT3991IDD#PBF 0
5006.07 SGD
2506.21 SGD
1006.54 SGD
257.91 SGD
111.91 SGD
Buy Now
LT3991EMSE-5#PBF 0
5005.45 SGD
2505.58 SGD
1005.87 SGD
257.10 SGD
110.68 SGD
Buy Now

Farnell element14

ProductStockPriceBuy
LT3991EDD#PBF 0
1002.92 GBP
253.26 GBP
15.36 GBP
Buy Now
LT3991EMSE#PBF 0
5002.81 GBP
2502.88 GBP
1002.95 GBP
503.02 GBP
253.09 GBP
104.47 GBP
14.86 GBP
Buy Now
LT3991IDD#PBF 0
12.52 GBP
Buy Now
LT3991EMSE-5#PBF 0
1002.92 GBP
253.21 GBP
15.29 GBP
Buy Now

List of equivalents and alternatives

The following DC/DC Buck Converter are similar to LT3991-5.0. Optional, compare LT3991-5.0 side-by-side with other Buck Converter via the Comparison function.

no alternatives found

Inductor suggestions

Below you can find matching inductors from Wuerth Elektronik calculated on the maximum parameters of LT3991-5.0.

V-IN max. 55 V, I-OUT 1.2 A, V-OUT min. 5 V, Frequency typ. 1000 kHz
Order Code Spec L (µH) IR (A) ISAT (A) RDC (mΩ) L x W x H (mm)
74404042100 10.0 1.2 1.5 150.00 4 x 4 x 1.8
74404052075 7.5 1.7 2.1 96.80 5 x 5 x 2
74404052100 10.0 1.6 2.0 109.00 5 x 5 x 2
74404054100 10.0 2.1 2.5 64.00 5 x 5 x 4
74404063082 8.2 2.3 2.5 55.00 6 x 6 x 2.8
74404063100 10.0 2.0 2.2 72.00 6 x 6 x 2.8
74404064120 12.0 2.2 3.0 58.00 6 x 6 x 4.5
744052007 7.5 1.4 1.5 70.00 5.8 x 5.8 x 2
744053008 8.2 2.1 1.6 50.00 5.8 x 5.8 x 3
744062007 7.5 1.7 1.6 50.00 6.8 x 6.8 x 2.5
7440650082 8.2 3.8 2.8 28.50 10 x 10 x 3.1
744065100 10.0 3.0 2.5 40.00 10 x 10 x 3.1
7440690082 8.2 1.7 1.5 99.00 8 x 8 x 1.5
7440700082 8.2 2.2 1.7 70.50 8 x 8 x 2
7440700100 10.0 2.0 1.6 78.00 8 x 8 x 2
744071100 10.0 3.4 2.8 28.00 8 x 8 x 4.6
74408942082 8.2 1.4 2.2 113.00 4.8 x 4.8 x 3.1
74408942100 10.0 1.4 2.1 125.00 4.8 x 4.8 x 3.1
74408943082 8.2 1.8 2.2 70.00 4.8 x 4.8 x 4.1
74408943100 10.0 1.7 2.1 82.00 4.8 x 4.8 x 4.1
74437321082 8.2 1.2 2.1 313.00 4.45 x 4.06 x 1.2
74437324082 8.2 1.6 2.8 158.00 4.45 x 4.06 x 2
74437324100 10.0 1.5 2.4 215.00 4.45 x 4.06 x 2
74438336100 10.0 1.2 2.4 280.00 3 x 3 x 2
7447462100 10.0 2.5 2.6 55.00 5.5 x 5.5 x 8.5
744773082 8.2 1.5 1.8 116.00 4 x 4.5 x 3.5
74477310 10.0 1.5 1.7 118.00 4 x 4.5 x 3.5
744773112 12.0 1.3 1.6 156.00 4 x 4.5 x 3.5
74477510 10.0 2.3 3.0 40.00 7 x 7.8 x 5.5
744775112 12.0 2.2 2.2 41.70 7 x 7.8 x 5.5
74477710 10.0 2.0 2.6 45.00 7.3 x 7.3 x 4.5
744777112 12.0 1.8 2.4 54.00 7.3 x 7.3 x 4.5
7447779008 8.2 2.7 3.0 47.00 7.3 x 7.3 x 4.5
744777910 10.0 2.0 2.6 45.00 7.3 x 7.3 x 4.5
7447779112 12.0 1.8 2.4 50.00 7.3 x 7.3 x 4.5
74477810 10.0 1.8 2.2 68.00 7.3 x 7.3 x 3.4
744778112 12.0 1.7 2.2 76.00 7.3 x 7.3 x 3.4
744778510 10.0 1.9 1.6 100.00 5.9 x 6.2 x 3.3
7447786008 8.2 2.3 2.1 66.00 5.9 x 6.2 x 5.1
744778610 10.0 2.1 1.8 74.00 5.9 x 6.2 x 5.1
744778910 10.0 1.8 2.2 64.00 7.3 x 7.3 x 3.5
7447789112 12.0 1.7 1.9 76.00 7.3 x 7.3 x 3.5
744779100 10.0 1.9 2.1 38.60 6 x 6 x 6.5
744787082 8.2 2.7 2.8 33.00 7.8 x 7 x 5
744787100 10.0 2.6 2.6 36.50 7.8 x 7 x 5
744787120 12.0 2.5 2.4 45.00 7.8 x 7 x 5
784773082 8.2 1.5 1.8 116.00 4 x 4.5 x 3.5
78477310 10.0 1.5 1.7 118.00 4 x 4.5 x 3.5
784773112 12.0 1.3 1.6 156.00 4 x 4.5 x 3.5
78477410 10.0 2.2 2.5 78.00 5.2 x 5.8 x 4.85
784774112 12.0 2.0 1.9 82.00 5.2 x 5.8 x 4.85
78477510 10.0 2.3 3.0 40.00 7 x 7.8 x 5.5
784775112 12.0 2.2 2.2 42.00 7 x 7.8 x 5.5
784777082 8.2 2.0 2.8 97.50 7.3 x 7.3 x 4.3
784777100 10.0 1.9 2.6 105.00 7.3 x 7.3 x 4.3
784778082 8.2 2.2 2.4 86.00 7.3 x 7.3 x 3.5
784778100 10.0 1.9 2.2 105.00 7.3 x 7.3 x 3.5
0Results
Module
Fresh Search
Replacement Search with
0% tolerance (0)
10% tolerance (0)
25% tolerance (0)
50% tolerance (0)
add to Compare
Feedback
ajax-loader.gif
Loading. Please wait.