LTC3549 Buck Converter overview



LTC3549 is a 5.50 V sync Buck Converter from with 0.25 A output current. The maximum 5.50 V input voltage can be regulated down into a 0.60 V to 5.00 V output voltage.

It requires are a typical inductor size of 3.30 µH, a typical external component count of 6 and achieves a peak efficiency of 93 %. Further LTC3549 characteristics are a fixed 2250 kHz switching frequency and 1 available package option(s): DFN-6 .

For the LTC3549 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.

Search Filter
V-IN min. 1.60 V
V-IN max. 5.50 V
I-OUT? 0.25 A
V-OUT min. 0.60 V
V-OUT max. 5.00 V
V-OUT adjustable V
V-OUT programmable no
sync/non-sync sync
Frequency typ. 2250 kHz
Frequency fixed
Frequency selectable
ext.clock sync. no
Frequency adj./ ext.clock min.
Frequency adj./ ext.clock max
Softstart yes
Softstart adjustable no
Tracking no
PG/Power OK no
Quiescent current max. 475 µA
Operating min. -40 °C
Operating max. 85 °C
Junction min.
Junction max.
thermal shutdown typ. 150 °C
Inductor size typ. 3.30 µH
Inductor suggested by Würth Elektronik
Automotive AEC-Q100 no
Light-Load-Mode yes
Topology Buck
Peak Efficiency 93 %
Component count min. 6
current limit adjustable no
Nr.of packages 1

LTC3549 Datasheet

Link to the most up-to-date LTC3549 datasheet and the product page for EVM, tools and support information.


LTC3549 Sample stock and distributor price breaks

LTC3549 prices and online available distributors.

Available Distributors with stock: 0

no online Distributor with LTC3549 stock available

Available Distributors with stock: 0

no online Distributor with LTC3549 stock available

List of equivalents and alternatives

The following DC/DC Buck Converter are similar to LTC3549. Optional, compare LTC3549 side-by-side with other Buck Converter via the Comparison function.

Variation Compare Product Manufacturer Package
0% AOZ1605DI AOZ1605DI product overviewAOZ1605DI product overview Alpha Omega DFN
0% LTC3103 LTC3103 product overviewLTC3103 product overview Linear Technology DFN-10, MSOP-10
0% LTC3542 LTC3542 product overviewLTC3542 product overview Linear Technology DFN-6, SOT23
0% MAX8560 MAX8560 product overviewMAX8560 product overview Maxim DFN-8, TSOT23-5
0% MAX8561 MAX8561 product overviewMAX8561 product overview Maxim TDFN-EP-8
0% MAX8562 MAX8562 product overviewMAX8562 product overview Maxim TDFN-EP-8
0% AAT1120 AAT1120 product overviewAAT1120 product overview Skyworks STDFN-8
0% AAT1121 AAT1121 product overviewAAT1121 product overview Skyworks TDFN-8
0% AAT1130 AAT1130 product overviewAAT1130 product overview Skyworks SC70-8
0% AAT2120 AAT2120 product overviewAAT2120 product overview Skyworks STDFN-8
0% AAT2500 AAT2500 product overviewAAT2500 product overview Skyworks TDFN-12
0% AAT2500M AAT2500M product overviewAAT2500M product overview Skyworks TSOPJW-12
0% SKY87250 SKY87250 product overviewSKY87250 product overview Skyworks DFN-8
0% TPS62240 TPS62240 product overviewTPS62240 product overview Texas Instruments SON-6, SOT-5
0% TPS62300 TPS62300 product overviewTPS62300 product overview Texas Instruments SON-10, DSBGA-8
0% TPS62320 TPS62320 product overviewTPS62320 product overview Texas Instruments SON-10, DSBGA-8
0% RP509Z-2 RP509Z-2 product overviewRP509Z-2 product overview Ricoh WLCSP-6
10% MIC23030 MIC23030 product overviewMIC23030 product overview Micrel MLF-6
10% MIC23031 MIC23031 product overviewMIC23031 product overview Micrel MLF-6
10% LM3670 LM3670 product overviewLM3670 product overview Texas Instruments SOT23-5
10% TPS62200 TPS62200 product overviewTPS62200 product overview Texas Instruments SOT23-5
10% TPS62220 TPS62220 product overviewTPS62220 product overview Texas Instruments TSOT23-5

Inductor suggestions

Below you can find matching inductors from Wuerth Elektronik calculated on the maximum parameters of LTC3549.

V-IN max. 5.5 V, I-OUT 0.25 A, V-OUT min. 0.6 V, Frequency typ. 2250 kHz
Order Code Spec L (µH) IR (A) ISAT (A) RDC (mΩ) L x W x H (mm)
74479776233A 3.3 1.3 0.3 120.00 2 x 1.6 x 1
74479787233A 3.3 1.6 0.4 100.00 2.5 x 2 x 1
74479887233A 3.3 1.2 0.6 180.00 2.5 x 2 x 1
Fresh Search
Replacement Search with
0% tolerance (0)
10% tolerance (0)
25% tolerance (0)
50% tolerance (0)
add to Compare
Loading. Please wait.