LT1977 Buck Converter overview

Description

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LT1977 is a 60.00 V non-sync Buck Converter from with 1.24 A output current. The maximum 60.00 V input voltage can be regulated down into a 1.25 V to 30.00 V output voltage.

It requires are a typical inductor size of 10.00 µH, a typical external component count of 13 and achieves a peak efficiency of 87 %. Further LT1977 characteristics are a fixed 500 kHz switching frequency and 1 available package option(s): TSSOP-16 .

For the LT1977 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. 3.30 V
V-IN max. 60.00 V
I-OUT? 1.24 A
V-OUT min. 1.25 V
V-OUT max. 30.00 V
V-OUT adjustable V
V-OUT programmable no
sync/non-sync non-sync
Frequency typ. 500 kHz
Frequency fixed
Frequency selectable
ext.clock sync. yes
Frequency adj./ ext.clock min. 230 kHz
Frequency adj./ ext.clock max 600 kHz
Softstart yes
Softstart adjustable yes
Tracking no
PG/Power OK yes
Quiescent current max. 4100 µA
Operating min.
Operating max.
Junction min. -40 °C
Junction max. 140 °C
thermal shutdown typ.
Inductor size typ. 10.00 µH
Inductor suggested by Würth Elektronik
Automotive AEC-Q100 no
Light-Load-Mode yes
Topology Buck
Peak Efficiency 87 %
Component count min. 13
current limit adjustable no
Nr.of packages 1
CSP
SC70
SOT
MSOP
QFN/DFN
SO/SOIC
SOP TSSOP-16
DIP
TO
DDPAK

LT1977 Datasheet

Link to the most up-to-date LT1977 datasheet and the product page for EVM, tools and support information.

LT1977

LT1977 Sample stock and distributor price breaks

LT1977 prices and online available distributors.

OEMSecrets.com
findchips.com

Available Distributors with stock: 6

ARROW-NAC (2)

ProductStockPriceBuy
LT1977IFE#PBF210
15.47 USD
1004.90 USD
Buy Now
LT1977EFE#PBF124
14.76 USD
1004.26 USD
Buy Now

Chip-One-Stop (1)

ProductStockPriceBuy
LT1977EFE#PBF380
17.37 USD
56.30 USD
106.15 USD
505.80 USD
1005.47 USD
2005.34 USD
Buy Now

DIGI-KEY (3)

ProductStockPriceBuy
LT1977EFE#PBF527
18.24 USD
255.47 USD
1004.26 USD
Buy Now
LT1977IFE#PBF539
19.47 USD
256.29 USD
1004.90 USD
Buy Now
DC639A2
1100.50 USD
Buy Now
LT1977EFE#TRPBF0
25004.36 USD
Buy Now
LT1977IFE#TRPBF0
25005.00 USD
Buy Now

Element14 (1)

ProductStockPriceBuy
LT1977IFE#PBF299
115.14 USD
2510.05 USD
1007.83 USD
Buy Now

FARNELL-ELEMENT14 (1)

ProductStockPriceBuy
LT1977IFE#PBF299Buy Now

TME (1)

ProductStockPriceBuy
LT1977EFE#PBF4Buy Now

Available Distributors without stock: 1

NEWARK (0)

ProductStockPriceBuy
LT1977EFE#PBF0
18.18 USD
255.41 USD
1004.26 USD
Buy Now
LT1977IFE#PBF0
19.51 USD
256.33 USD
1004.90 USD
Buy Now
LT1977IFE#TRPBF0
17.94 USD
25005.69 USD
Buy Now

Available Distributors with stock: 0

no online Distributor with LT1977 stock available

List of equivalents and alternatives

The following DC/DC Buck Converter are similar to LT1977. Optional, compare LT1977 side-by-side with other Buck Converter via the Comparison function.

Variation Compare Product Manufacturer Package
0% LT1976 LT1976 product overviewLT1976 product overview Linear Technology TSSOP-16
0% LT3434 LT3434 product overviewLT3434 product overview Linear Technology TSSOP-16
0% LT3435 LT3435 product overviewLT3435 product overview Linear Technology TSSOP-16

Inductor suggestions

Below you can find matching inductors from Wuerth Elektronik calculated on the maximum parameters of LT1977.

V-IN max. 60 V, I-OUT 1.24 A, V-OUT min. 1.25 V, Frequency typ. 500 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
74404041047 4.7 1.6 1.9 91.00 4 x 4 x 1.2
74404042047 4.7 1.7 2.2 70.00 4 x 4 x 1.8
74404042068 6.8 1.5 1.8 98.00 4 x 4 x 1.8
74404052047 4.7 2.3 2.7 55.90 5 x 5 x 2
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
744042004 4.7 1.7 1.7 70.00 4.8 x 4.8 x 2
744043004 4.7 1.6 1.7 50.00 4.8 x 4.8 x 3
744045004 4.7 1.2 2.0 120.00 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
7440530047 4.7 2.4 2.0 30.00 5.8 x 5.8 x 3
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
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
7440680047 4.7 1.9 1.6 72.00 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
7440700047 4.7 3.0 2.2 37.00 8 x 8 x 2
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
74408941050 5.0 1.4 2.5 140.00 4.8 x 4.8 x 2.1
74408942047 4.7 1.6 2.9 86.80 4.8 x 4.8 x 3.1
74408942068 6.8 1.5 2.4 110.00 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
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
74438335047 4.7 1.5 2.8 141.00 3 x 3 x 1.5
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
744773047 4.7 1.8 2.5 59.00 4 x 4.5 x 3.5
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
7447785004 4.7 2.2 2.5 60.00 5.9 x 6.2 x 3.3
7447785006 6.8 2.3 2.0 79.00 5.9 x 6.2 x 3.3
7447786004 4.7 2.8 2.8 57.00 5.9 x 6.2 x 5.1
7447786006 6.8 2.5 2.3 62.00 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
78438335047 4.7 1.5 2.8 141.00 3 x 3 x 1.5
784773047 4.7 1.8 2.5 59.00 4 x 4.5 x 3.5
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
784778068 6.8 2.3 2.5 79.00 7.3 x 7.3 x 3.5
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