LT3690 Buck Converter overview

Description

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LT3690 is a 36.00 V sync Buck Converter from with 4.00 A output current. The maximum 36.00 V input voltage can be regulated down into a 0.80 V to 20.00 V output voltage.

It requires are a typical inductor size of 3.30 µH, a typical external component count of 10 and achieves a peak efficiency of 92 %. Further LT3690 characteristics are a adjustable 1500 kHz switching frequency and 1 available package option(s): QFN-26 .

For the LT3690 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. 3.90 V
V-IN max. 36.00 V
I-OUT? 4.00 A
V-OUT min. 0.80 V
V-OUT max. 20.00 V
V-OUT adjustable V
V-OUT programmable no
sync/non-sync sync
Frequency typ. 1500 kHz
Frequency adjustable
Frequency selectable
ext.clock sync. yes
Frequency adj./ ext.clock min. 170 kHz
Frequency adj./ ext.clock max 1500 kHz
Softstart yes
Softstart adjustable yes
Tracking yes
PG/Power OK yes
Quiescent current max. 150 µA
Operating min.
Operating max.
Junction min. -55 °C
Junction max. 155 °C
thermal shutdown typ.
Inductor size typ. 3.30 µH
Inductor suggested by Würth Elektronik
Automotive AEC-Q100 no
Light-Load-Mode yes
Topology Buck
Peak Efficiency 92 %
Component count min. 10
current limit adjustable no
Nr.of packages 1
CSP
SC70
SOT
MSOP
QFN/DFN QFN-26
SO/SOIC
SOP
DIP
TO
DDPAK

LT3690 Datasheet

Link to the most up-to-date LT3690 datasheet and the product page for EVM, tools and support information.

LT3690

LT3690 Sample stock and distributor price breaks

LT3690 prices and online available distributors.

OEMSecrets.com
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Available Distributors with stock: 0

no online Distributor with LT3690 stock available

Available Distributors with stock: 0

no online Distributor with LT3690 stock available

List of equivalents and alternatives

The following DC/DC Buck Converter are similar to LT3690. Optional, compare LT3690 side-by-side with other Buck Converter via the Comparison function.

Variation Compare Product Manufacturer Package
25% LM43603 LM43603 product overviewLM43603 product overview Texas Instruments HTSSOP-16
25% LM43603-Q1 LM43603-Q1 product overviewLM43603-Q1 product overview Texas Instruments HTSSOP-16
50% LT8610 LT8610 product overviewLT8610 product overview Linear Technology MSOP-16
50% LT8611 LT8611 product overviewLT8611 product overview Linear Technology QFN-24
50% LTC3626 LTC3626 product overviewLTC3626 product overview Linear Technology QFN-20
50% LM43602 LM43602 product overviewLM43602 product overview Texas Instruments HTSSOP-16
50% LM43602-Q1 LM43602-Q1 product overviewLM43602-Q1 product overview Texas Instruments HTSSOP-16
50% LM46002 LM46002 product overviewLM46002 product overview Texas Instruments HTSSOP-16
50% LM46002-Q1 LM46002-Q1 product overviewLM46002-Q1 product overview Texas Instruments HTSSOP-16

Inductor suggestions

Below you can find matching inductors from Wuerth Elektronik calculated on the maximum parameters of LT3690.

V-IN max. 36 V, I-OUT 4 A, V-OUT min. 0.8 V, Frequency typ. 1500 kHz
Order Code Spec L (µH) IR (A) ISAT (A) RDC (mΩ) L x W x H (mm)
744040420033 0.3 4.5 7.6 13.00 4 x 4 x 1.8
744040520047 0.5 4.9 8.0 13.90 5 x 5 x 2
74404300033 0.3 4.0 6.0 8.00 4.8 x 4.8 x 3
74406900052 0.5 4.3 5.8 15.00 8 x 8 x 1.5
74407000047 0.5 7.8 6.5 5.80 8 x 8 x 2
744089420039 0.4 4.2 10.3 15.00 4.8 x 4.8 x 3.1
744089420056 0.6 4.1 8.3 15.60 4.8 x 4.8 x 3.1
744089430039 0.4 4.2 9.3 13.50 4.8 x 4.8 x 4.1
744373210047 0.5 5.4 9.0 18.00 4.45 x 4.06 x 1.2
744373240056 0.6 6.0 10.5 13.50 4.45 x 4.06 x 2
744383340033 0.3 4.8 11.1 19.00 3 x 3 x 1.2
744383340047 0.5 4.0 9.4 22.00 3 x 3 x 1.2
744383350047 0.5 4.6 5.8 20.00 3 x 3 x 1.5
744383360033 0.3 5.5 8.3 14.00 3 x 3 x 2
744383360047 0.5 4.8 8.0 18.00 3 x 3 x 2
744383560056 0.6 8.5 10.8 7.00 4.1 x 4.1 x 2.1
744778005 0.5 5.6 9.0 7.20 7.3 x 7.3 x 3.4
784383340033 0.3 4.8 11.1 19.00 3 x 3 x 1.2
784383340047 0.5 4.0 9.4 22.00 3 x 3 x 1.2
784383350047 0.5 4.6 5.8 20.00 3 x 3 x 1.5
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