LT3955 LED Buck-Boost Driver overview

Description

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LT3955 is a 1 channel, 60.0 V, 0.13 A/string non-sync LED Buck-Boost Driver. It can drive a maximum of 20 LED (~3.5Vfwd) per string, features a adjustable 1000 kHz frequency and is available in 1 package option(s): QFN-36 .

Further characteristics are a feedback voltage of 2.020 V, a typical inductor size of 22.0 uH and a peak efficiency of 94 %.

Parameter and features overview

ParameterValueReplacement
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Nr. of Channel 1
V-IN min. 4.5 V
V-IN max. 60.0 V
V-OUT max. 80.0 V
Nr.of LED per string typ. 20
I-OUT/string? 0.13 A
current limit typ. 4.20 A
sync/non-sync non-sync
Frequency typ. 1000 kHz
Frequency adjustable
Frequency min. 100 kHz
Frequency max. 1000 kHz
Softstart yes
Softstart adjustable no
Down-Mode no
Quiescent current max. 2200 uA
Operating min. -40 °C
Operating max. 85 °C
Junction min. -40 °C
Junction max. 125 °C
thermal shutdown typ. 125 °C
Inductor size typ. 22.0 uH
feedback voltage 2.020 V
Automotive AEC-Q100 no
Topology Buck-Boost
Peak Efficiency 94 %
Component count min. 20
DC dimming yes
PWM dimming yes
PWM frequency min. 0.17 kHz
PWM frequency max. 0.4 kHz
digital dimming no
digital interface no
LED flash no
TxMask no
Nr.of current sources 1
Nr.of package options 1
CSP
SC70
SOT
MSOP
QFN/DFN QFN-36
SO/SOIC
SOP
DIP

LT3955 Datasheet

Link to the most up-to-date LT3955 datasheet and the product page for EVM, tools and support information.

LT3955

LT3955 inventory, samples and price

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List with equivalents & alternatives

The following DC/DC LED Buck-Boost driver are similar to LT3955. Optional, compare LT3955 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 LT3955.

V-IN min. 4.5 V, V-OUT max. 80 V, current limit typ. 4.2 A, Frequency typ. 1000 kHz
Order Code Spec L (µH) IR (A) ISAT (A) RDC (mΩ) L x W x H (mm)
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