LT3991 Buck Converter overview

Description

Manufacturer
 
Category
Sub-Category

LT3991 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 1.20 V to 30.00 V output voltage.

It requires are a typical inductor size of 12.00 µH, a typical external component count of 8 and achieves a peak efficiency of 89 %. Further LT3991 characteristics are a adjustable 1000 kHz switching frequency and 2 available package option(s): MSOP-10 DFN-10 .

For the LT3991 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. 1.20 V
V-OUT max. 30.00 V
V-OUT adjustable 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. 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

LT3991 Datasheet

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

LT3991

LT3991 Sample stock and distributor price breaks

LT3991 prices and online available distributors.

OEMSecrets.com
findchips.com

Available Distributors with stock: 8

Chip One Stop (5)

ProductStockPriceBuy
LT3991EDD#PBF241
16.39 USD
106.29 USD
504.16 USD
1003.54 USD
Buy Now
LT3991EMSE-5#PBF150
16.69 USD
104.30 USD
503.81 USD
1003.75 USD
Buy Now
LT3991EMSE#PBF155
16.73 USD
105.61 USD
505.55 USD
1003.73 USD
Buy Now
LT3991IMSE-5#PBF28
17.66 USD
104.92 USD
Buy Now
LT3991IMSE#PBF37
17.66 USD
104.92 USD
Buy Now

Digi-Key (5)

ProductStockPriceBuy
LT3991EDD#PBF2996
16.43 USD
254.30 USD
1003.65 USD
Buy Now
LT3991IMSE-5#PBF339
17.15 USD
254.78 USD
1004.06 USD
Buy Now
LT3991IDD#PBF775
17.15 USD
254.78 USD
1004.06 USD
Buy Now
LT3991EDD#TRPBF0
25003.75 USD
Buy Now
LT3991EDD#TRPBF1600
17.35 USD
256.56 USD
1004.50 USD
2504.13 USD
Buy Now
LT3991EDD#TRPBF1600
17.35 USD
256.56 USD
1004.50 USD
2504.13 USD
Buy Now
LT3991IMSE#PBF0
17.15 USD
254.78 USD
1004.06 USD
Buy Now
LT3991EMSE#TRPBF0
25003.75 USD
Buy Now
LT3991EMSE#TRPBF0
17.35 USD
256.56 USD
1004.50 USD
2504.13 USD
Buy Now
LT3991EMSE#TRPBF0
17.35 USD
256.56 USD
1004.50 USD
2504.13 USD
Buy Now
LT3991EMSE#PBF0
16.43 USD
254.30 USD
1003.65 USD
Buy Now
LT3991EMSE-3.3#PBF0
16.43 USD
254.30 USD
1003.65 USD
Buy Now
LT3991EMSE-5#PBF0
16.43 USD
254.30 USD
1003.65 USD
Buy Now
LT3991EMSE-3.3#TRPBF0
25003.75 USD
Buy Now
LT3991EMSE-5#TRPBF0
25003.75 USD
Buy Now
LT3991IMSE-3.3#PBF0
2004.06 USD
Buy Now
LT3991IDD#TRPBF0
25004.16 USD
Buy Now
LT3991IMSE#TRPBF0
25004.16 USD
Buy Now
LT3991IMSE-3.3#TRPBF0
25004.16 USD
Buy Now
LT3991IMSE-5#TRPBF0
25004.16 USD
Buy Now
DC1526A0
1127.50 USD
Buy Now
LT3991EDD0
00.00 USD
Buy Now
LT3991IDD0
00.00 USD
Buy Now

Distrelec (1)

ProductStockPriceBuy
LT3991EMSE#PBF24Buy Now

Element14 (2)

ProductStockPriceBuy
LT3991EMSE#PBF1176
19.81 USD
256.57 USD
1005.57 USD
Buy Now
LT3991IDD#PBF137
110.90 USD
257.30 USD
1006.19 USD
Buy Now

Farnell Element14 (2)

ProductStockPriceBuy
LT3991EDD#PBF0Buy Now
LT3991EMSE-5#PBF0Buy Now
LT3991EMSE#PBF1521Buy Now
LT3991IDD#PBF137Buy Now

Mouser Electronics (6)

ProductStockPriceBuy
LT3991IMSE#TRPBF2500
18.36 USD
107.76 USD
257.46 USD
1005.11 USD
2504.70 USD
25004.26 USD
Buy Now
LT3991EMSE#PBF243
16.60 USD
106.06 USD
254.41 USD
1003.74 USD
Buy Now
LT3991IMSE#PBF200
17.34 USD
106.73 USD
254.90 USD
1004.16 USD
Buy Now
LT3991IDD#PBF129
17.34 USD
106.73 USD
254.90 USD
1004.16 USD
Buy Now
LT3991EDD#PBF242
16.60 USD
106.06 USD
254.41 USD
1003.74 USD
Buy Now
LT3991EMSE-3.3#PBF339 On Order
16.60 USD
106.06 USD
254.41 USD
1003.74 USD
Buy Now
LT3991EMSE#TRPBFNone
25003.85 USD
Buy Now
LT3991EMSE-5#PBFNone
2003.74 USD
Buy Now
LT3991IMSE-5#PBFNone
2004.16 USD
Buy Now
LT3991IDD#TRPBFNone
25004.26 USD
Buy Now
LT3991IMSE-3.3#PBFNone
2004.16 USD
Buy Now
LT3991EDD#TRPBFNone
25003.85 USD
Buy Now
LT3991EMSE-3.3#TRPBFNone
25003.85 USD
Buy Now
LT3991IMSE-5#TRPBFNone
25004.26 USD
Buy Now
LT3991EMSE-5#TRPBFNone
25003.85 USD
Buy Now
LT3991IMSE-3.3#TRPBFNone
25004.26 USD
Buy Now

Newark Electronics (1)

ProductStockPriceBuy
LT3991EMSE-3.3#PBF10
13.21 USD
253.21 USD
1003.21 USD
Buy Now

RS Components (5)

ProductStockPriceBuy
LT3991EDD#PBF116Buy Now
LT3991EMSE#PBF21Buy Now
LT3991EMSE#PBF211Buy Now
LT3991EMSE#PBF50Buy Now
LT3991IMSE#PBF16Buy Now

Available Distributors without stock: 1

Rutronik (0)

ProductStockPriceBuy
nnBuy Now

Available Distributors with stock: 8

Arrow Electronics

ProductStockPriceBuy
LT3991EMSE-3.3#PBF 3796
14.22 $
1003.58 $
Buy Now
LT3991EMSE#TRPBF 990
1003.68 $
Buy Now
LT3991IMSE#PBF 744
14.69 $
1003.98 $
Buy Now
LT3991IDD#PBF 726
14.69 $
1003.98 $
Buy Now
LT3991IMSE-5#PBF 423
14.69 $
1003.98 $
Buy Now
LT3991IMSE#PBF 195
14.69 $
1003.98 $
Buy Now
LT3991EDD#PBF 72
14.22 $
1003.58 $
Buy Now
LT3991EMSE-3.3#PBF 45
14.22 $
1003.58 $
Buy Now
LT3991EMSE-5#PBF 7
14.22 $
1003.58 $
Buy Now
LT3991EMSE-5#PBF 7
14.22 $
1003.58 $
Buy Now
LT3991EMSE#TRPBF 0
1003.68 $
Buy Now
LT3991IMSE-5#PBF 0
14.69 $
1003.98 $
Buy Now
LT3991IDD#PBF 0
14.69 $
1003.98 $
Buy Now
LT3991EMSE-5#TRPBF 0
1003.68 $
Buy Now
LT3991IMSE-5#TRPBF 0
1004.08 $
Buy Now
show stock=0hide stock=0

Digi-Key

ProductStockPriceBuy
LT3991EDD#PBF 2996
1003.11 €
253.67 €
15.48 €
Buy Now
LT3991EDD#TRPBF 1600
2503.52 €
1003.84 €
255.60 €
16.27 €
Buy Now
LT3991EDD#TRPBF 1600
2503.52 €
1003.84 €
255.60 €
16.27 €
Buy Now
LT3991IDD#PBF 775
1003.46 €
254.08 €
16.10 €
Buy Now
LT3991IMSE-5#PBF 339
1003.46 €
254.08 €
16.10 €
Buy Now
LT3991EDD#TRPBF 0
25003.20 €
Buy Now
LT3991IMSE#PBF 0
1003.46 €
254.08 €
16.10 €
Buy Now
LT3991EMSE#TRPBF 0
25003.20 €
Buy Now
LT3991EMSE#TRPBF 0
2503.52 €
1003.84 €
255.60 €
16.27 €
Buy Now
LT3991EMSE#TRPBF 0
2503.52 €
1003.84 €
255.60 €
16.27 €
Buy Now
LT3991EMSE#PBF 0
1003.11 €
253.67 €
15.48 €
Buy Now
LT3991EMSE-3.3#PBF 0
1003.11 €
253.67 €
15.48 €
Buy Now
LT3991EMSE-5#PBF 0
1003.11 €
253.67 €
15.48 €
Buy Now
LT3991EMSE-3.3#TRPBF 0
25003.20 €
Buy Now
LT3991EMSE-5#TRPBF 0
25003.20 €
Buy Now
show stock=0hide stock=0

Newark element14

ProductStockPriceBuy
LT3991EMSE-3.3#PBF 10
13.21 $
253.21 $
1003.21 $
Buy Now

Mouser Electronics

ProductStockPriceBuy
LT3991IMSE#TRPBF 2500
18.16 $
107.57 $
257.28 $
1004.99 $
2504.58 $
25004.16 $
Buy Now
LT3991EMSE#PBF 243
16.44 $
105.91 $
254.30 $
1003.65 $
Buy Now
LT3991IMSE#PBF 200
17.16 $
106.56 $
254.78 $
1004.06 $
Buy Now
LT3991IDD#PBF 129
17.16 $
106.56 $
254.78 $
1004.06 $
Buy Now
LT3991EDD#PBF 0
16.44 $
105.91 $
254.30 $
1003.65 $
Buy Now
LT3991EMSE-3.3#PBF 0
16.44 $
105.91 $
254.30 $
1003.65 $
Buy Now
LT3991EMSE#TRPBF 0
25003.75 $
Buy Now
LT3991EMSE-5#PBF 0
2003.65 $
Buy Now
LT3991IMSE-5#PBF 0
2004.06 $
Buy Now
LT3991IDD#TRPBF 0
25004.16 $
Buy Now
LT3991IMSE-3.3#PBF 0
2004.06 $
Buy Now
LT3991EMSE-3.3#TRPBF 0
25003.75 $
Buy Now
LT3991EDD#TRPBF 0
25003.75 $
Buy Now
LT3991IMSE-5#TRPBF 0
25004.16 $
Buy Now
LT3991EMSE-5#TRPBF 0
25003.75 $
Buy Now
show stock=0hide stock=0

element14 Asia-Pacific

ProductStockPriceBuy
LT3991IDD#PBF 137
18.72 $
255.84 $
1004.95 $
Buy Now
LT3991EMSE#PBF 1176
17.85 $
255.26 $
1004.45 $
Buy Now

Farnell element14

ProductStockPriceBuy
LT3991EDD#PBF 0
15.36 GBP
253.26 GBP
1002.92 GBP
Buy Now
LT3991IDD#PBF 137
15.85 GBP
253.39 GBP
1003.08 GBP
Buy Now
LT3991EMSE#PBF 1521
15.19 GBP
104.70 GBP
253.15 GBP
503.08 GBP
1003.00 GBP
Buy Now
show stock=0hide stock=0

Chip1Stop

ProductStockPriceBuy
LT3991EDD#PBF 241
1003.54 $
504.16 $
16.39 $
Buy Now
LT3991IMSE#PBF 37
104.92 $
17.66 $
Buy Now
LT3991IMSE-5#PBF 28
104.92 $
17.66 $
Buy Now
LT3991EMSE-5#PBF 150
1003.75 $
503.81 $
16.69 $
Buy Now
LT3991EMSE#PBF 155
1003.73 $
505.55 $
16.73 $
Buy Now

RS Components

ProductStockPriceBuy
LT3991EDD#PBF 116
64.88 GBP
304.50 GBP
614.12 GBP
Buy Now
LT3991IMSE#PBF 16
265.18 GBP
Buy Now
LT3991EMSE#PBF 50
503.74 GBP
2503.37 GBP
5003.33 GBP
Buy Now
LT3991EMSE#PBF 211
104.80 GBP
254.34 GBP
Buy Now
LT3991EMSE#PBF 21
15.26 GBP
104.80 GBP
254.34 GBP
Buy Now

List of equivalents and alternatives

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

Variation Compare Product Manufacturer Package
0% LT3980 LT3980 product overviewLT3980 product overview Linear Technology DFN-14, MSOP-16
10% TPS54162-Q1 TPS54162-Q1 product overviewTPS54162-Q1 product overview Texas Instruments HTSSOP-20
10% TPS54262-Q1 TPS54262-Q1 product overviewTPS54262-Q1 product overview Texas Instruments HTSSOP-20
10% TPS57160-Q1 TPS57160-Q1 product overviewTPS57160-Q1 product overview Texas Instruments SON-10, MSOP-10
25% TPS54140A TPS54140A product overviewTPS54140A product overview Texas Instruments SON-10, MSOP-10
50% LT3682 LT3682 product overviewLT3682 product overview Linear Technology DFN-12
50% LT3971 LT3971 product overviewLT3971 product overview Linear Technology DFN-10, MSOP-10
50% MP2454 MP2454 product overviewMP2454 product overview MPS QFN-10, MSOP-10
50% MPQ2454 MPQ2454 product overviewMPQ2454 product overview MPS QFN-10, MSOP-10
50% MPQ2454-AEC1 MPQ2454-AEC1 product overviewMPQ2454-AEC1 product overview MPS QFN-10, MSOP-10

Inductor suggestions

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

V-IN max. 55 V, I-OUT 1.2 A, V-OUT min. 1.2 V, Frequency typ. 1000 kHz
Order Code Spec L (µH) IR (A) ISAT (A) RDC (mΩ) L x W x H (mm)
744025002 2.2 1.8 2.4 57.00 2.8 x 2.8 x 3
744025003 3.3 1.5 1.8 85.00 2.8 x 2.8 x 3
74404024022 2.2 1.8 2.0 80.00 2.5 x 2 x 1.2
74404032022 2.2 1.8 1.7 50.00 3 x 3 x 1.5
74404032033 3.3 1.5 1.5 70.00 3 x 3 x 1.5
74404041033 3.3 1.8 2.1 69.00 4 x 4 x 1.2
74404042033 3.3 2.0 2.9 55.00 4 x 4 x 1.8
74404052033 3.3 2.6 3.0 42.20 5 x 5 x 2
74404052039 3.9 2.4 2.8 50.50 5 x 5 x 2
7440420027 2.7 2.0 2.2 47.00 4.8 x 4.8 x 2
744042003 3.3 2.0 1.8 50.00 4.8 x 4.8 x 2
7440420039 3.9 1.8 1.7 60.00 4.8 x 4.8 x 2
7440430022 2.2 2.5 2.4 27.00 4.8 x 4.8 x 3
7440430027 2.7 2.4 2.0 25.00 4.8 x 4.8 x 3
744043003 3.3 2.2 1.8 30.00 4.8 x 4.8 x 3
7440430039 3.9 1.7 1.7 50.00 4.8 x 4.8 x 3
744045002 2.2 1.6 2.8 88.00 4.5 x 3.2 x 2.9
7440450027 2.7 1.5 2.7 96.00 4.5 x 3.2 x 2.9
744045003 3.3 1.4 2.7 104.00 4.5 x 3.2 x 2.9
7440450039 3.9 1.3 2.5 112.00 4.5 x 3.2 x 2.9
744052002 2.5 2.4 2.7 20.00 5.8 x 5.8 x 2
744052003 3.0 2.2 2.4 40.00 5.8 x 5.8 x 2
7440520039 3.9 2.0 2.1 50.00 5.8 x 5.8 x 2
744053002 2.6 3.0 2.7 20.00 5.8 x 5.8 x 3
744053003 3.0 2.8 2.5 20.00 5.8 x 5.8 x 3
744062002 2.2 3.4 2.7 10.00 6.8 x 6.8 x 2.5
744062003 3.3 2.8 2.5 20.00 6.8 x 6.8 x 2.5
7440680027 2.7 2.2 1.9 52.00 8 x 8 x 1.2
7440680033 3.3 2.0 1.8 61.00 8 x 8 x 1.2
7440690022 2.2 2.8 2.9 35.00 8 x 8 x 1.5
7440690033 3.3 2.6 2.3 42.00 8 x 8 x 1.5
7440700033 3.3 3.2 2.6 30.00 8 x 8 x 2
74408941029 2.9 1.6 3.0 101.00 4.8 x 4.8 x 2.1
74408941035 3.5 1.5 2.8 113.00 4.8 x 4.8 x 2.1
74438322022 2.2 1.3 2.2 252.00 2.5 x 2 x 0.8
74438323022 2.2 1.3 2.5 147.00 2.5 x 2 x 1
74438323033 3.3 1.3 2.1 220.00 2.5 x 2 x 1
74438324022 2.2 1.6 2.9 123.00 2.5 x 2 x 1.2
74438324033 3.3 1.3 2.6 226.00 2.5 x 2 x 1.2
744773027 2.7 2.3 3.0 39.00 4 x 4.5 x 3.5
744773033 3.3 2.0 2.9 41.00 4 x 4.5 x 3.5
744773039 3.9 1.9 2.6 54.00 4 x 4.5 x 3.5
7447785003 3.3 2.8 3.0 43.00 5.9 x 6.2 x 3.3
74479275222 2.2 1.3 1.7 166.00 2 x 1.25 x 1
74479276222 2.2 1.4 1.8 135.00 2 x 1.6 x 1
74479276222C 2.2 1.6 2.5 112.00 2 x 1.25 x 1
74479287222 2.2 1.5 2.5 132.00 2.5 x 2 x 1
74479288222 2.2 1.7 2.8 90.00 2.5 x 2 x 1.2
74479889222 2.2 1.3 1.7 250.00 2.5 x 2 x 1.2
78438322022 2.2 1.3 2.2 252.00 2.5 x 2 x 0.8
78438323022 2.2 1.3 2.5 147.00 2.5 x 2 x 1
78438323033 3.3 1.3 2.1 220.00 2.5 x 2 x 1
784773033 3.3 2.0 2.9 41.00 4 x 4.5 x 3.5
784773039 3.9 1.9 2.6 54.00 4 x 4.5 x 3.5
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