AAT1143-1.2 Buck Converter overview



AAT1143-1.2 is a 5.50 V sync Buck Converter from with 0.40 A output current. The maximum 5.50 V input voltage can be regulated down into a 1.20 V to 1.20 V output voltage.

It requires are a typical inductor size of 4.70 µH, a typical external component count of 3 and achieves a peak efficiency of 95 %. Further AAT1143-1.2 characteristics are a fixed 1000 kHz switching frequency and 1 available package option(s): SC70-8 .

For the AAT1143-1.2 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.

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V-IN min. 2.70 V
V-IN max. 5.50 V
I-OUT? 0.40 A
V-OUT min. 1.20 V
V-OUT max. 1.20 V
V-OUT 1.200 V
V-OUT programmable no
sync/non-sync sync
Frequency typ. 1000 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. 50 µA
Operating min. -40 °C
Operating max. 85 °C
Junction min. -40 °C
Junction max. 150 °C
thermal shutdown typ. 140 °C
Inductor size typ. 4.70 µH
Inductor suggested by Würth Elektronik
Automotive AEC-Q100 no
Light-Load-Mode no
Topology Buck
Peak Efficiency 95 %
Component count min. 3
current limit adjustable no
Nr.of packages 1
SC70 SC70-8

AAT1143-1.2 Datasheet

Link to the most up-to-date AAT1143-1.2 datasheet and the product page for EVM, tools and support information.


AAT1143-1.2 Sample stock and distributor price breaks

AAT1143-1.2 prices and online available distributors.


Available Distributors with stock: 0

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Available Distributors without stock: 1

Mouser-Electronics (0)

30000.22 USD
60000.22 USD
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List of equivalents and alternatives

The following DC/DC Buck Converter are similar to AAT1143-1.2. Optional, compare AAT1143-1.2 side-by-side with other Buck Converter via the Comparison function.

Variation Compare Product Manufacturer Package
0% AS1334-1.2 AS1334-1.2 product overviewAS1334-1.2 product overview AMS DFN-8
0% ADP2102-1,2 ADP2102-1,2 product overviewADP2102-1,2 product overview Analog Devices QFN-8
0% ADP2108-1,2 ADP2108-1,2 product overviewADP2108-1,2 product overview Analog Devices TSOT23-5, CSP-5
0% ADP2109-1,2 ADP2109-1,2 product overviewADP2109-1,2 product overview Analog Devices CSP-5
0% ADP2126-1,2 ADP2126-1,2 product overviewADP2126-1,2 product overview Analog Devices CSP-6
0% ADP2127-1,2 ADP2127-1,2 product overviewADP2127-1,2 product overview Analog Devices WLCSP-6
0% ADP2138-1,2 ADP2138-1,2 product overviewADP2138-1,2 product overview Analog Devices WLCSP-6
0% ADP2139-1,2 ADP2139-1,2 product overviewADP2139-1,2 product overview Analog Devices WLCSP-6
0% FAN5358-1.2 FAN5358-1.2 product overviewFAN5358-1.2 product overview Fairchild SC70-6
0% ISL9103-1.2 ISL9103-1.2 product overviewISL9103-1.2 product overview Intersil TDFN-6
0% ISL9103A-1.2 ISL9103A-1.2 product overviewISL9103A-1.2 product overview Intersil TDFN-6
0% ISL9104-1.2 ISL9104-1.2 product overviewISL9104-1.2 product overview Intersil TDFN-6
0% ISL9104A-1.2 ISL9104A-1.2 product overviewISL9104A-1.2 product overview Intersil TDFN-6
0% MAX8640Y-1.2 MAX8640Y-1.2 product overviewMAX8640Y-1.2 product overview Maxim u00b5DFN-6
0% MAX8640Z-1.2 MAX8640Z-1.2 product overviewMAX8640Z-1.2 product overview Maxim u00b5DFN-6
0% MAX8884-1.2 MAX8884-1.2 product overviewMAX8884-1.2 product overview Maxim CSP-16
0% MIC23030-1.2 MIC23030-1.2 product overviewMIC23030-1.2 product overview Micrel MLF-6
0% MIC23031-1.2 MIC23031-1.2 product overviewMIC23031-1.2 product overview Micrel MLF-6
0% MIC23050-1.2 MIC23050-1.2 product overviewMIC23050-1.2 product overview Micrel MLF-8
0% MCP1602-1.2 MCP1602-1.2 product overviewMCP1602-1.2 product overview Microchip DFN-8, MSOP-8
0% DC6M501X6-1.2 DC6M501X6-1.2 product overviewDC6M501X6-1.2 product overview NXP CSP-6
0% DC6M503X6-1.2 DC6M503X6-1.2 product overviewDC6M503X6-1.2 product overview NXP CSP-6
0% DC6M601X6-1.2 DC6M601X6-1.2 product overviewDC6M601X6-1.2 product overview NXP CSP-6
0% DC6M603X6-1.2 DC6M603X6-1.2 product overviewDC6M603X6-1.2 product overview NXP CSP-6
0% AAT1141-1.2 AAT1141-1.2 product overviewAAT1141-1.2 product overview Skyworks SOT23-5
0% AAT1146-1.2 AAT1146-1.2 product overviewAAT1146-1.2 product overview Skyworks SOT23-5, SC70-8
0% ST1S12XX12 ST1S12XX12 product overviewST1S12XX12 product overview ST TSOT23-5
0% LM3671-1.2 LM3671-1.2 product overviewLM3671-1.2 product overview Texas Instruments USON-6, SOT23-5, DSBGA-5
0% LM3671-Q1-1.2 LM3671-Q1-1.2 product overviewLM3671-Q1-1.2 product overview Texas Instruments SOT23-5
0% LM3674-1.2 LM3674-1.2 product overviewLM3674-1.2 product overview Texas Instruments SOT23-5
0% LM3677-1.2 LM3677-1.2 product overviewLM3677-1.2 product overview Texas Instruments USON-6, DSBGA-5
0% LM8801-1.2 LM8801-1.2 product overviewLM8801-1.2 product overview Texas Instruments DSBGA-6
0% TPS62227 TPS62227 product overviewTPS62227 product overview Texas Instruments TSOT23-5
0% TPS62232 TPS62232 product overviewTPS62232 product overview Texas Instruments SON-6
0% TPS62235 TPS62235 product overviewTPS62235 product overview Texas Instruments SON-6
0% TPS62262 TPS62262 product overviewTPS62262 product overview Texas Instruments SON-6, SOT-5
0% TPS62262-Q1 TPS62262-Q1 product overviewTPS62262-Q1 product overview Texas Instruments SON-6, SOT-5
0% TPS62304 TPS62304 product overviewTPS62304 product overview Texas Instruments SON-10, DSBGA-8
0% XC9244-1.2 XC9244-1.2 product overviewXC9244-1.2 product overview Torex USPN-6
0% XC9245-1.2 XC9245-1.2 product overviewXC9245-1.2 product overview Torex USPN-6
0% XC9254R XC9254R product overviewXC9254R product overview Torex USP-6, SOT25-5
0% RP504x-1.2 RP504x-1.2 product overviewRP504x-1.2 product overview Ricoh DFN-6, SOT23-5
0% RP508x-1.2 RP508x-1.2 product overviewRP508x-1.2 product overview Ricoh DFN-6
0% TS33000-1.2 TS33000-1.2 product overviewTS33000-1.2 product overview Triune Systems QFN-16
0% RP509Z-2-1.2 RP509Z-2-1.2 product overviewRP509Z-2-1.2 product overview Ricoh WLCSP-6

Inductor suggestions

Below you can find matching inductors from Wuerth Elektronik calculated on the maximum parameters of AAT1143-1.2.

V-IN max. 5.5 V, I-OUT 0.4 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)
744028006 6.8 0.8 0.6 325.00 2.8 x 2.8 x 1.2
744029006 6.8 0.8 0.7 250.00 2.8 x 2.8 x 1.5
744031006 6.8 0.9 0.8 135.00 3.8 x 3.8 x 1.8
744032006 6.8 0.4 1.1 320.00 3.2 x 2.5 x 2.3
74404024068 6.8 0.9 1.0 300.00 2.5 x 2 x 1.2
74404032068 6.8 1.2 0.9 120.00 3 x 3 x 1.5
744042008 8.2 1.4 1.1 100.00 4.8 x 4.8 x 2
744043008 8.2 1.3 1.1 90.00 4.8 x 4.8 x 3
7440680082 8.2 1.4 1.1 142.00 8 x 8 x 1.2
74479889268 6.8 0.8 0.7 500.00 2.5 x 2 x 1.2
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