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: 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. 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
0Results
Module
Fresh Search
Replacement Search with
0% tolerance (0)
10% tolerance (0)
25% tolerance (0)
50% tolerance (0)
add to Compare
Last Tweets
With the help of #OEMsecrets we show for all Selectors and products worldwide distributor inventory and prices. https://t.co/udaDPmshky
Update for the DC/DC Buck-Boost Converter Selector with additional products, fresh equivalent suggestions and more: https://t.co/C8PXhcizYQ
Meet us at the Electronica Tradeshow in Munich, appointments under info@dcdcselector.com https://t.co/1uiualLN1x
Feedback
ajax-loader.gif
Loading. Please wait.