LT3797 Buck (multi-topology) LED driver IC overview

Description

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LT3797 is a non-sync DC/DC Buck (multi-topology) LED driver IC from . Maximum input voltage is 40.0 V and it drives an output current of up to 1.00 A. Assuming a typical 3.5V LED forward voltage LT3797 can drive up to 9 LED in series.

The LED Buck (multi-topology) driver IC features adjustable 1000 kHz switching frequency, a feedback voltage of 0.11 V and requires a typical inductor size of 33.0 uH. This combination results in a peak efficiency of ~94 %. LT3797 comes in 1 package option(s) - QFN-52 .

Parameter and feature overview

ParameterValueReplacement
Search Filter
Nr. of Channel 3
V-IN min. 2.5 V
V-IN max. 40.0 V
Nr.of LEDs max. 9
I-OUT? 1.00 A
MOSFET extern
ext.clock sync. yes
sync/non-sync non-sync
Frequency typ. 1000 kHz
Frequency adjustable adjustable
Frequency min. 100 kHz
Frequency max. 1000 kHz
Softstart yes
Softstart adjustable yes
Quiescent current max. 750 uA
Operating min. -40 °C
Operating max. 125 °C
Junction min.
Junction max. 125 °C
thermal shutdown typ.
Inductor size 33.0 uH
Inductor suggested by Würth Elektronik
Feedback Voltage 0.11 V
Automotive AEC-Q100 no
Topology Buck (multi-topology)
Peak Efficiency 94 %
Component count min. 43
DC Dimming yes
PWM Dimming yes
digital dimming no
Nr. of package options 1
SC70
SOT
MSOP
QFN/DFN QFN-52
SO/SOIC
SOP
DIP
TO
Variation
LED temperature compensation no

LT3797 Datasheet

Link to the most up-to-date LT3797 datasheet and the product page for EVM, tools and support information.

LT3797

LT3797 inventory, samples and price

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no online Distributor with LT3797 stock available

Available Distributors with stock: 0

no online Distributor with LT3797 stock available

Equivalents and alternatives

The following DC/DC LED Buck (multi-topology) driver are similar to LT3797. Optional, compare LT3797 side-by-side with other LED driver via the Comparison function.

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Inductor suggestions

Below you can find matching inductors from Wuerth Elektronik calculated on the maximum parameters of LT3797.

V-IN min. 2.5 V, V-IN max. 40 V, I-OUT 1 A, Frequency typ. 1000 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
744025006 6.8 1.1 1.3 142.00 2.8 x 2.8 x 3
74404024047 4.7 1.1 1.2 175.00 2.5 x 2 x 1.2
74404032047 4.7 1.3 1.2 96.00 3 x 3 x 1.5
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
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
744042004 4.7 1.7 1.7 70.00 4.8 x 4.8 x 2
744042005 5.6 1.6 1.4 80.00 4.8 x 4.8 x 2
744042006 6.8 1.5 1.3 80.00 4.8 x 4.8 x 2
744043004 4.7 1.6 1.7 50.00 4.8 x 4.8 x 3
744043005 5.6 1.4 1.3 70.00 4.8 x 4.8 x 3
744043006 6.8 1.3 1.3 80.00 4.8 x 4.8 x 3
744045004 4.7 1.2 2.0 120.00 4.5 x 3.2 x 2.9
7440450056 5.6 1.2 1.9 144.00 4.5 x 3.2 x 2.9
744045006 6.8 1.1 1.6 160.00 4.5 x 3.2 x 2.9
744045008 8.2 1.0 1.6 200.00 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
744053008 8.2 2.1 1.6 50.00 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
7440680056 5.6 1.5 1.4 110.00 8 x 8 x 1.2
7440680068 6.8 1.4 1.2 127.00 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
7440690082 8.2 1.7 1.5 99.00 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
7440700082 8.2 2.2 1.7 70.50 8 x 8 x 2
74408941068 6.8 1.1 2.1 190.00 4.8 x 4.8 x 2.1
74408941078 7.8 1.1 1.9 230.00 4.8 x 4.8 x 2.1
74408942068 6.8 1.5 2.4 110.00 4.8 x 4.8 x 3.1
74408942082 8.2 1.4 2.2 113.00 4.8 x 4.8 x 3.1
74408943082 8.2 1.8 2.2 70.00 4.8 x 4.8 x 4.1
74437321068 6.8 1.3 2.4 300.00 4.45 x 4.06 x 1.2
74437321082 8.2 1.2 2.1 313.00 4.45 x 4.06 x 1.2
74438324047 4.7 1.0 2.1 300.00 2.5 x 2 x 1.2
74438335068 6.8 1.1 2.4 250.00 3 x 3 x 1.5
744773068 6.8 1.5 2.1 76.00 4 x 4.5 x 3.5
744773082 8.2 1.5 1.8 116.00 4 x 4.5 x 3.5
7447785006 6.8 2.3 2.0 79.00 5.9 x 6.2 x 3.3
7447786006 6.8 2.5 2.3 62.00 5.9 x 6.2 x 5.1
7447786008 8.2 2.3 2.1 66.00 5.9 x 6.2 x 5.1
78438335068 6.8 1.1 2.4 250.00 3 x 3 x 1.5
784773068 6.8 1.5 2.1 76.00 4 x 4.5 x 3.5
784773082 8.2 1.5 1.8 116.00 4 x 4.5 x 3.5
784778082 8.2 2.2 2.4 86.00 7.3 x 7.3 x 3.5
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