AT9919B Buck LED driver IC overview

Description

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Category
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AT9919B is a non-sync DC/DC Buck LED driver IC from . Maximum input voltage is 40.0 V and it drives an output current of up to 3.00 A. Assuming a typical 3.5V LED forward voltage AT9919B can drive up to 9 LED in series.

The LED Buck driver IC features fixed 2000 kHz switching frequency, a feedback voltage of 0.20 V and requires a typical inductor size of 47.0 uH. This combination results in a peak efficiency of ~92 %. AT9919B comes in 1 package option(s) - DFN-8 .

Parameter and feature overview

ParameterValueReplacement
Search Filter
Nr. of Channel 1
V-IN min. 4.5 V
V-IN max. 40.0 V
Nr.of LEDs max. 9
I-OUT? 3.00 A
MOSFET extern
ext.clock sync. no
sync/non-sync non-sync
Frequency typ. 2000 kHz
Frequency adjustable fixed
Frequency min.
Frequency max.
Softstart no
Softstart adjustable no
Quiescent current max. 1500 uA
Operating min. -40 °C
Operating max. 125 °C
Junction min.
Junction max.
thermal shutdown typ. 140.0 °C
Inductor size 47.0 uH
Inductor suggested by Würth Elektronik
Feedback Voltage 0.20 V
Automotive AEC-Q100 yes
Topology Buck
Peak Efficiency 92 %
Component count min. 7
DC Dimming yes
PWM Dimming yes
digital dimming no
Nr. of package options 1
SC70
SOT
MSOP
QFN/DFN DFN-8
SO/SOIC
SOP
DIP
TO
Variation
LED temperature compensation

AT9919B Datasheet

Link to the most up-to-date AT9919B datasheet and the product page for EVM, tools and support information.

AT9919B

AT9919B inventory, samples and price

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Equivalents and alternatives

The following DC/DC LED Buck driver are similar to AT9919B. Optional, compare AT9919B side-by-side with other LED driver via the Comparison function.

Variation Compare Product Manufacturer Package
0% AT9919 AT9919 product overviewAT9919 product overview Supertex DFN-8
0% ZXLD1370Q ZXLD1370Q product overviewZXLD1370Q product overview Diodes TSSOP-16
0% ZXLD1371Q ZXLD1371Q product overviewZXLD1371Q product overview Diodes TSSOP-16

Inductor suggestions

Below you can find matching inductors from Wuerth Elektronik calculated on the maximum parameters of AT9919B.

V-IN min. 4.5 V, V-IN max. 40 V, I-OUT 3 A, Frequency typ. 2000 kHz
Order Code Spec L (µH) IR (A) ISAT (A) RDC (mΩ) L x W x H (mm)
74404052015 1.5 3.3 4.9 25.70 5 x 5 x 2
74404052022 2.2 3.0 3.6 31.60 5 x 5 x 2
74404054015 1.5 4.3 6.9 15.00 5 x 5 x 4
74404054022 2.2 3.8 5.3 19.00 5 x 5 x 4
74404063015 1.5 4.6 6.6 13.00 6 x 6 x 2.8
74404063022 2.2 3.8 5.6 20.00 6 x 6 x 2.8
7440620015 1.5 4.3 4.0 10.00 6.8 x 6.8 x 2.5
7440650022 2.2 6.2 5.9 11.00 10 x 10 x 3.1
7440660022 2.2 6.7 6.8 7.70 10 x 10 x 4.1
744071022 2.2 5.4 6.3 10.00 8 x 8 x 4.6
74408943022 2.2 3.0 4.6 26.00 4.8 x 4.8 x 4.1
74437321015 1.5 3.0 4.0 55.00 4.45 x 4.06 x 1.2
74437324022 2.2 3.3 6.5 51.00 4.45 x 4.06 x 2
74438336015 1.5 3.7 4.5 33.00 3 x 3 x 2
74438356018 1.8 4.6 6.5 24.50 4.1 x 4.1 x 2.1
74438356022 2.2 4.7 6.2 29.00 4.1 x 4.1 x 2.1
7447462022 2.2 6.3 4.3 10.00 5.5 x 5.5 x 8.5
744773014 1.4 3.4 5.0 22.00 4 x 4.5 x 3.5
744777002 2.2 6.0 6.5 13.00 7.3 x 7.3 x 4.5
7447779002 2.2 4.2 6.0 16.00 7.3 x 7.3 x 4.5
744778002 2.2 4.0 4.8 14.00 7.3 x 7.3 x 3.4
7447786002 2.2 3.5 4.0 40.00 5.9 x 6.2 x 5.1
7447789002 2.2 4.0 4.8 19.00 7.3 x 7.3 x 3.5
784775022 2.2 6.0 6.0 8.00 7 x 7.8 x 5.5
784778022 2.2 3.1 5.0 42.00 7.3 x 7.3 x 3.5
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