LT3991-3.3 Buck Converter overview

Description

Manufacturer
 
Category
Sub-Category

LT3991-3.3 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 3.30 V to 3.30 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 LT3991-3.3 characteristics are a adjustable 1000 kHz switching frequency and 2 available package option(s): MSOP-10 DFN-10 .

For the LT3991-3.3 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. 3.30 V
V-OUT max. 3.30 V
V-OUT 3.300 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

LT3991-3.3 Datasheet

Link to the most up-to-date LT3991-3.3 datasheet and the product page for EVM, tools and support information.

LT3991-3.3

LT3991-3.3 Sample stock and distributor price breaks

LT3991-3.3 prices and online available distributors.

OEMSecrets.com
findchips.com

Available Distributors with stock: 7

ARROW-NAC (10)

ProductStockPriceBuy
LT3991EMSE-5#PBF858
14.22 USD
1003.58 USD
Buy Now
LT3991IDD#PBF54
14.69 USD
1003.98 USD
Buy Now
LT3991IDD#PBF24
14.69 USD
1003.98 USD
Buy Now
LT3991IMSE-3.3#PBF298
14.69 USD
1003.98 USD
Buy Now
LT3991EDD#TRPBF5000
25003.63 USD
Buy Now
LT3991IMSE-5#PBF750
14.69 USD
1003.98 USD
Buy Now
LT3991EDD#PBF335
14.22 USD
1003.58 USD
Buy Now
LT3991EMSE-3.3#PBF23
14.22 USD
1003.58 USD
Buy Now
LT3991IMSE#PBF750
14.69 USD
1003.98 USD
Buy Now
LT3991EMSE#TRPBF2500
25003.63 USD
Buy Now

Chip-One-Stop (14)

ProductStockPriceBuy
LT3991EDD#PBF121
15.38 USD
103.80 USD
503.66 USD
1003.59 USD
Buy Now
LT3991EDD#PBF372
16.68 USD
105.62 USD
255.55 USD
505.30 USD
1005.17 USD
2004.93 USD
Buy Now
LT3991EDD#TRPBF2500
25004.03 USD
Buy Now
LT3991EMSE-3.3#PBF33
16.44 USD
105.42 USD
255.36 USD
Buy Now
LT3991EMSE-5#PBF5
15.67 USD
Buy Now
LT3991EMSE-5#PBF302
16.56 USD
105.52 USD
255.45 USD
505.20 USD
1005.08 USD
2004.85 USD
Buy Now
LT3991EMSE#PBF127
15.72 USD
104.03 USD
503.89 USD
1003.82 USD
Buy Now
LT3991EMSE#PBF6597
16.68 USD
105.62 USD
255.55 USD
505.30 USD
1005.17 USD
2004.93 USD
Buy Now
LT3991EMSE#TRPBF5000
25003.89 USD
Buy Now
LT3991IDD#PBF663
17.14 USD
56.10 USD
105.95 USD
505.61 USD
1005.29 USD
2005.17 USD
Buy Now
LT3991IDD#PBF663
17.14 USD
56.10 USD
105.95 USD
505.61 USD
1005.29 USD
2005.17 USD
Buy Now
LT3991IMSE-5#PBF40
15.98 USD
104.22 USD
Buy Now
LT3991IMSE#PBF50
15.98 USD
104.66 USD
504.25 USD
Buy Now
LT3991IMSE#PBF622
17.14 USD
56.10 USD
105.95 USD
505.61 USD
1005.29 USD
2005.17 USD
Buy Now

DIGI-KEY (7)

ProductStockPriceBuy
LT3991EMSE#PBF4954
16.31 USD
254.22 USD
1003.58 USD
Buy Now
LT3991EDD#PBF2287
16.31 USD
254.22 USD
1003.58 USD
Buy Now
LT3991EMSE-3.3#PBF754
16.31 USD
254.22 USD
1003.58 USD
Buy Now
LT3991EMSE-5#PBF540
16.31 USD
254.22 USD
1003.58 USD
Buy Now
LT3991IMSE#PBF750
17.01 USD
254.69 USD
1003.98 USD
Buy Now
LT3991IMSE-5#PBF675
17.01 USD
254.69 USD
1003.98 USD
Buy Now
LT3991IDD#PBF303
17.01 USD
254.69 USD
1003.98 USD
Buy Now
LT3991EDD#TRPBF0
25003.68 USD
Buy Now
LT3991EMSE#TRPBF0
25003.68 USD
Buy Now
LT3991EMSE-3.3#TRPBF0
25003.68 USD
Buy Now
LT3991EMSE-5#TRPBF0
25003.68 USD
Buy Now
LT3991IMSE-3.3#PBF0
2003.98 USD
Buy Now
LT3991IDD#TRPBF0
25004.08 USD
Buy Now
LT3991IMSE#TRPBF0
25004.08 USD
Buy Now
LT3991IMSE-3.3#TRPBF0
25004.08 USD
Buy Now
LT3991IMSE-5#TRPBF0
25004.08 USD
Buy Now

Element14 (3)

ProductStockPriceBuy
LT3991EDD#PBF117
110.09 USD
256.75 USD
1005.72 USD
Buy Now
LT3991EMSE-5#PBF14
110.09 USD
256.75 USD
1005.72 USD
Buy Now
LT3991EMSE#PBF144
110.09 USD
256.75 USD
1005.72 USD
Buy Now
LT3991IDD#PBF0
111.20 USD
257.50 USD
1006.36 USD
Buy Now

FARNELL-ELEMENT14 (3)

ProductStockPriceBuy
LT3991EDD#PBF117Buy Now
LT3991EMSE-5#PBF44Buy Now
LT3991EMSE#PBF670Buy Now

NEWARK (3)

ProductStockPriceBuy
LT3991EDD#PBF91
13.73 USD
Buy Now
LT3991EDD#TRPBF0
16.12 USD
25004.39 USD
Buy Now
LT3991EMSE-3.3#PBF16
13.58 USD
253.58 USD
1003.58 USD
Buy Now
LT3991EMSE-5#PBF0
16.30 USD
254.23 USD
1003.58 USD
Buy Now
LT3991EMSE-5#TRPBF0
16.12 USD
25004.39 USD
Buy Now
LT3991EMSE#PBF0
16.30 USD
254.23 USD
1003.58 USD
Buy Now
LT3991EMSE#TRPBF0
16.12 USD
25004.39 USD
Buy Now
LT3991IDD#PBF50
13.98 USD
253.98 USD
1003.98 USD
Buy Now
LT3991IDD#TRPBF0
16.80 USD
25004.88 USD
Buy Now
LT3991IMSE#PBF0
17.01 USD
254.70 USD
1003.98 USD
Buy Now
LT3991IMSE#TRPBF0
16.80 USD
25004.88 USD
Buy Now

RS-COMPONENTS (3)

ProductStockPriceBuy
LT3991EDD#PBF129Buy Now
LT3991EMSE#PBF411Buy Now
LT3991IMSE#PBF54Buy Now

Available Distributors with stock: 0

no online Distributor with LT3991 stock available

List of equivalents and alternatives

The following DC/DC Buck Converter are similar to LT3991-3.3. Optional, compare LT3991-3.3 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 LT3991-3.3.

V-IN max. 55 V, I-OUT 1.2 A, V-OUT min. 3.3 V, Frequency typ. 1000 kHz
Order Code Spec L (µH) IR (A) ISAT (A) RDC (mΩ) L x W x H (mm)
74404042068 6.8 1.5 1.8 98.00 4 x 4 x 1.8
74404052056 5.6 2.1 2.6 67.50 5 x 5 x 2
74404052068 6.8 1.9 2.4 82.70 5 x 5 x 2
74404052075 7.5 1.7 2.1 96.80 5 x 5 x 2
74404063068 6.8 2.4 2.8 47.00 6 x 6 x 2.8
74404063082 8.2 2.3 2.5 55.00 6 x 6 x 2.8
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
744053005 5.3 2.3 1.9 30.00 5.8 x 5.8 x 3
744053006 6.2 2.2 1.7 40.00 5.8 x 5.8 x 3
744053008 8.2 2.1 1.6 50.00 5.8 x 5.8 x 3
744062005 5.0 2.2 2.0 40.00 6.8 x 6.8 x 2.5
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
7440650082 8.2 3.8 2.8 28.50 10 x 10 x 3.1
7440690068 6.8 1.8 1.7 88.00 8 x 8 x 1.5
7440690082 8.2 1.7 1.5 99.00 8 x 8 x 1.5
7440700056 5.6 2.6 2.0 47.00 8 x 8 x 2
7440700068 6.8 2.4 1.8 56.00 8 x 8 x 2
7440700082 8.2 2.2 1.7 70.50 8 x 8 x 2
74408941050 5.0 1.4 2.5 140.00 4.8 x 4.8 x 2.1
74408942068 6.8 1.5 2.4 110.00 4.8 x 4.8 x 3.1
74408942082 8.2 1.4 2.2 113.00 4.8 x 4.8 x 3.1
74408943068 6.8 2.0 2.7 51.00 4.8 x 4.8 x 4.1
74408943082 8.2 1.8 2.2 70.00 4.8 x 4.8 x 4.1
74437321056 5.6 1.6 2.7 180.00 4.45 x 4.06 x 1.2
74437321068 6.8 1.3 2.4 300.00 4.45 x 4.06 x 1.2
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
74438336068 6.8 1.6 2.9 168.00 3 x 3 x 2
7447462068 6.8 3.3 3.0 27.00 5.5 x 5.5 x 8.5
744773056 5.6 1.6 2.4 69.00 4 x 4.5 x 3.5
744773068 6.8 1.5 2.1 76.00 4 x 4.5 x 3.5
744773082 8.2 1.5 1.8 116.00 4 x 4.5 x 3.5
7447779008 8.2 2.7 3.0 47.00 7.3 x 7.3 x 4.5
7447785006 6.8 2.3 2.0 79.00 5.9 x 6.2 x 3.3
7447786006 6.8 2.5 2.3 62.00 5.9 x 6.2 x 5.1
7447786008 8.2 2.3 2.1 66.00 5.9 x 6.2 x 5.1
7447789006 6.8 2.5 2.8 41.50 7.3 x 7.3 x 3.5
744779068 6.8 2.2 2.8 27.00 6 x 6 x 6.5
744787068 6.8 3.0 3.0 27.00 7.8 x 7 x 5
744787082 8.2 2.7 2.8 33.00 7.8 x 7 x 5
784773056 5.6 1.6 2.4 69.00 4 x 4.5 x 3.5
784773068 6.8 1.5 2.1 76.00 4 x 4.5 x 3.5
784773082 8.2 1.5 1.8 116.00 4 x 4.5 x 3.5
784777082 8.2 2.0 2.8 97.50 7.3 x 7.3 x 4.3
784778068 6.8 2.3 2.5 79.00 7.3 x 7.3 x 3.5
784778082 8.2 2.2 2.4 86.00 7.3 x 7.3 x 3.5
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