LT1938 Buck Converter overview

Description

Manufacturer
 
Category
Sub-Category

LT1938 is a 25.00 V non-sync Buck Converter from with 2.20 A output current. The maximum 25.00 V input voltage can be regulated down into a 1.27 V to 20.00 V output voltage.

It requires are a typical inductor size of 4.70 µH, a typical external component count of 10 and achieves a peak efficiency of 88 %. Further LT1938 characteristics are a adjustable 3000 kHz switching frequency and 1 available package option(s): DFN-10 .

For the LT1938 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. 3.60 V
V-IN max. 25.00 V
I-OUT? 2.20 A
V-OUT min. 1.27 V
V-OUT max. 20.00 V
V-OUT adjustable V
V-OUT programmable no
sync/non-sync non-sync
Frequency typ. 3000 kHz
Frequency adjustable
Frequency selectable
ext.clock sync. no
Frequency adj./ ext.clock min. 300 kHz
Frequency adj./ ext.clock max 2800 kHz
Softstart yes
Softstart adjustable no
Tracking no
PG/Power OK yes
Quiescent current max. 2000 µA
Operating min.
Operating max.
Junction min. -40 °C
Junction max. 125 °C
thermal shutdown typ.
Inductor size typ. 4.70 µH
Inductor suggested by Würth Elektronik
Automotive AEC-Q100 no
Light-Load-Mode no
Topology Buck
Peak Efficiency 88 %
Component count min. 10
current limit adjustable no
Nr.of packages 1
CSP
SC70
SOT
MSOP
QFN/DFN DFN-10
SO/SOIC
SOP
DIP
TO
DDPAK

LT1938 Datasheet

Link to the most up-to-date LT1938 datasheet and the product page for EVM, tools and support information.

LT1938

LT1938 Sample stock and distributor price breaks

LT1938 prices and online available distributors.

OEMSecrets.com
findchips.com

Available Distributors with stock: 5

ARROW-NAC (1)

ProductStockPriceBuy
LT1938EDD#PBF47
13.93 USD
1003.24 USD
Buy Now

Chip-One-Stop (2)

ProductStockPriceBuy
LT1938EDD#PBF97
16.00 USD
105.05 USD
254.99 USD
504.76 USD
Buy Now
LT1938EDD#TRPBF5000
25003.53 USD
Buy Now

DIGI-KEY (2)

ProductStockPriceBuy
LT1938EDD#PBF1560
15.53 USD
253.93 USD
1003.24 USD
Buy Now
LT1938IDD#PBF205
16.63 USD
254.71 USD
1003.88 USD
Buy Now
LT1938EDD#TRPBF0
25003.34 USD
Buy Now
LT1938IDD#TRPBF0
25003.98 USD
Buy Now

Element14 (1)

ProductStockPriceBuy
LT1938EDD#PBF22
18.84 USD
256.28 USD
1005.18 USD
Buy Now

FARNELL-ELEMENT14 (1)

ProductStockPriceBuy
LT1938EDD#PBF22Buy Now

Available Distributors without stock: 1

NEWARK (0)

ProductStockPriceBuy
LT1938EDD#PBF0
15.51 USD
253.76 USD
1003.24 USD
Buy Now

Available Distributors with stock: 0

no online Distributor with LT1938 stock available

List of equivalents and alternatives

The following DC/DC Buck Converter are similar to LT1938. Optional, compare LT1938 side-by-side with other Buck Converter via the Comparison function.

Variation Compare Product Manufacturer Package
0% A8583 A8583 product overviewA8583 product overview Allegro TSSOP-16
0% A8584 A8584 product overviewA8584 product overview Allegro TSSOP-16
0% LT1913 LT1913 product overviewLT1913 product overview Linear Technology DFN-10
0% LT3680 LT3680 product overviewLT3680 product overview Linear Technology DFN-10, MSOP-10
0% LT3693 LT3693 product overviewLT3693 product overview Linear Technology DFN-10, MSOP-10
0% LT3972 LT3972 product overviewLT3972 product overview Linear Technology DFN-10, MSOP-10
0% LT3975 LT3975 product overviewLT3975 product overview Linear Technology MSOP-16
0% MAX16909 MAX16909 product overviewMAX16909 product overview Maxim TSSOP-EP-16, TQFN-16
0% LM26003 LM26003 product overviewLM26003 product overview Texas Instruments HTSSOP-20
0% LM26003-Q1 LM26003-Q1 product overviewLM26003-Q1 product overview Texas Instruments HTSSOP-20
0% LM2696 LM2696 product overviewLM2696 product overview Texas Instruments HTSSOP-16
0% TPS54240 TPS54240 product overviewTPS54240 product overview Texas Instruments SON-10, MSOP-10
0% TPS54240-Q1 TPS54240-Q1 product overviewTPS54240-Q1 product overview Texas Instruments SON-10, MSOP-10
0% TPS54362-Q1 TPS54362-Q1 product overviewTPS54362-Q1 product overview Texas Instruments HTSSOP-20
0% TPS54361 TPS54361 product overviewTPS54361 product overview Texas Instruments WSON-10
0% TPS54361-Q1 TPS54361-Q1 product overviewTPS54361-Q1 product overview Texas Instruments WSON-10
0% R1270S R1270S product overviewR1270S product overview Ricoh HSOP-18
10% A8582 A8582 product overviewA8582 product overview Allegro TSSOP-16
10% ISL8540 ISL8540 product overviewISL8540 product overview Intersil HTSSOP-20
10% ISL8560 ISL8560 product overviewISL8560 product overview Intersil QFN-20
10% ISL8560MR ISL8560MR product overviewISL8560MR product overview Intersil QFN-20
10% LT3480 LT3480 product overviewLT3480 product overview Linear Technology DFN-10, MSOP-10
10% LT3481 LT3481 product overviewLT3481 product overview Linear Technology DFN-10, MSOP-10
10% LT3681 LT3681 product overviewLT3681 product overview Linear Technology DFN-14
10% LT3684 LT3684 product overviewLT3684 product overview Linear Technology DFN-10, MSOP-10
10% LT3685 LT3685 product overviewLT3685 product overview Linear Technology DFN-10, MSOP-10
10% LT3980 LT3980 product overviewLT3980 product overview Linear Technology DFN-14, MSOP-16
10% TPS54262-Q1 TPS54262-Q1 product overviewTPS54262-Q1 product overview Texas Instruments HTSSOP-20
50% LT3971 LT3971 product overviewLT3971 product overview Linear Technology DFN-10, MSOP-10
50% LT3971A LT3971A product overviewLT3971A product overview Linear Technology MSOP-8
50% LT3991 LT3991 product overviewLT3991 product overview Linear Technology DFN-10, MSOP-10
50% LM26001 LM26001 product overviewLM26001 product overview Texas Instruments HTSSOP-16
50% LM26001-Q1 LM26001-Q1 product overviewLM26001-Q1 product overview Texas Instruments HTSSOP-16
50% LM26001B LM26001B product overviewLM26001B product overview Texas Instruments HTSSOP-16
50% TPS54140A TPS54140A product overviewTPS54140A product overview Texas Instruments SON-10, MSOP-10

Inductor suggestions

Below you can find matching inductors from Wuerth Elektronik calculated on the maximum parameters of LT1938.

V-IN max. 25 V, I-OUT 2.2 A, V-OUT min. 1.265 V, Frequency typ. 3000 kHz
Order Code Spec L (µH) IR (A) ISAT (A) RDC (mΩ) L x W x H (mm)
74402500047 0.5 3.3 4.7 19.00 2.8 x 2.8 x 3
74402500072 0.7 3.0 4.0 23.50 2.8 x 2.8 x 3
744040240047 0.5 2.9 5.2 32.00 2.5 x 2 x 1.2
744040240068 0.7 2.5 3.5 35.00 2.5 x 2 x 1.2
744040320047 0.5 3.0 2.8 18.00 3 x 3 x 1.5
744040410047 0.5 3.3 4.3 28.00 4 x 4 x 1.2
74404200056 0.6 3.1 3.0 19.00 4.8 x 4.8 x 2
74404300047 0.5 3.8 5.0 10.00 4.8 x 4.8 x 3
74406800056 0.6 3.4 4.0 22.00 8 x 8 x 1.2
744383210047 0.5 2.2 3.7 76.00 2.5 x 2 x 0.6
744383220047 0.5 2.3 4.4 70.00 2.5 x 2 x 0.8
744383230047 0.5 3.2 5.5 37.00 2.5 x 2 x 1
744383230068 0.7 3.1 4.7 46.00 2.5 x 2 x 1
744383430047 0.5 2.3 5.3 49.00 2.5 x 1.6 x 0.6
74479275147 0.5 2.6 3.3 38.00 2 x 1.25 x 1
74479276147 0.5 2.9 4.2 34.00 2 x 1.6 x 1
74479276147C 0.5 2.7 4.5 33.00 2 x 1.25 x 1
74479276168 0.7 2.5 3.4 45.00 2 x 1.6 x 1
74479287147 0.5 3.3 5.0 25.00 2.5 x 2 x 1
74479298147 0.5 3.0 4.5 28.00 3.2 x 2.5 x 1
74479976147 0.5 2.7 2.9 24.00 2 x 1.6 x 0.5
74479976147A 0.5 3.0 3.4 20.00 2 x 1.6 x 0.5
784383210047 0.5 2.2 3.7 76.00 2.5 x 2 x 0.6
784383220047 0.5 2.3 4.4 70.00 2.5 x 2 x 0.8
784383230047 0.5 3.2 5.5 37.00 2.5 x 2 x 1
784383230068 0.7 3.1 4.7 46.00 2.5 x 2 x 1
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