LT3477 LED Buck-Boost Driver overview

Description

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LT3477 is a 1 channel, 25.0 V, 1.00 A/string non-sync LED Buck-Boost Driver. It can drive a maximum of 12 LED (~3.5Vfwd) per string, features a adjustable 3500 kHz frequency and is available in 2 package option(s): QFN-20 TSSOP-20 .

Further characteristics are a feedback voltage of 0.150 V, a typical inductor size of 10.0 uH and a peak efficiency of 87 %.

Parameter and features overview

ParameterValueReplacement
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Nr. of Channel 1
V-IN min. 2.5 V
V-IN max. 25.0 V
V-OUT max. 40.0 V
Nr.of LED per string typ. 12
I-OUT/string? 1.00 A
current limit typ. 4.00 A
sync/non-sync non-sync
Frequency typ. 3500 kHz
Frequency adjustable
Frequency min. 200 kHz
Frequency max. 3500 kHz
Softstart yes
Softstart adjustable yes
Down-Mode no
Quiescent current max. 7500 uA
Operating min. -40 °C
Operating max. 125 °C
Junction min.
Junction max.
thermal shutdown typ.
Inductor size typ. 10.0 uH
feedback voltage 0.150 V
Automotive AEC-Q100 no
Topology Buck-Boost
Peak Efficiency 87 %
Component count min. 11
DC dimming yes
PWM dimming yes
PWM frequency min. 0.10 kHz
PWM frequency max. 20.0 kHz
digital dimming no
digital interface no
LED flash no
TxMask no
Nr.of current sources 1
Nr.of package options 2
CSP
SC70
SOT
MSOP
QFN/DFN QFN-20
SO/SOIC
SOP TSSOP-20
DIP

LT3477 Datasheet

Link to the most up-to-date LT3477 datasheet and the product page for EVM, tools and support information.

LT3477

LT3477 inventory, samples and price

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List with equivalents & alternatives

The following DC/DC LED Buck-Boost driver are similar to LT3477. Optional, compare LT3477 side-by-side with other LED driver via the comparison function.

Variation Compare Product Manufacturer Package
50% LT3518 LT3518 product overviewLT3518 product overview Linear Technology QFN-16, TSSOP-16

Inductor suggestions

Below you can find matching inductors from Wuerth Elektronik calculated on the maximum parameters of LT3477.

V-IN min. 2.5 V, V-OUT max. 40 V, current limit typ. 4 A, Frequency typ. 3500 kHz
Order Code Spec L (µH) IR (A) ISAT (A) RDC (mΩ) L x W x H (mm)
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