LTC3855 Buck Controller overview

Description

Manufacturer
 
Category
Sub-Category

LTC3855 is a 2 channel, 12 phase sync Buck Controller. The maximum input voltage ranges from 4.50 V to 38.00 V and output current goes up to 25.00 A.

The Controller features fixed 770 kHz switching frequency which results in a typical inductor size of 0.0 uH and a peak efficiency of %. The LTC3855 is available in 2 package option(s): QFN-40 SSOP-38 .

Parameter and features overview

ParameterValueReplacement
Search Filter
Nr. of Channel 2
V-IN min. 4.50 V
V-IN max. 38.00 V
I-OUT? 25.00 A
V-OUT min. 0.60 V
V-OUT max. 12.50 V
V-OUT adjustable
V-OUT programmable
sync/non-sync sync
Frequency typ. 770 kHz
Frequency adj. fixed
Frequency adj. min.
Frequency adj. max.
ext.clock sync. yes
ext.clock Frequency min. 250 kHz
ext.clock Frequency max. 770 kHz
Softstart
Softstart adjustable
Tracking yes
Power Good (PG)
Enable
Operating min.
Operating max.
Junction min.
Junction max.
thermal shutdown typ.
Inductor size typ.
Automotive AEC-Q100
Light-Load Mode
Single/ Multiphase multi
Nr. of Phases 12
Peak Efficiency
component count min.
current limit adjustable
Nr.of package options 2
CSP
SOT
MSOP
QFN/DFN QFN-40
SO/SOIC
SOP SSOP-38
DIP

LTC3855 Datasheet

Link to the most up-to-date LTC3855 datasheet and the product page for EVM, tools and support information.

LTC3855

LTC3855 inventory, samples and price

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Available Distributors with stock: 0

no online Distributor with LTC3855 stock available

Available Distributors with stock: 5

Arrow Electronics

ProductStockPriceBuy
LTC3855IUJ#TRPBF 2000
20004.46 $
Buy Now
LTC3855IUJ#PBF 358
10004.04 $
5004.20 $
2504.30 $
1004.36 $
255.47 $
18.25 $
Buy Now
LTC3855EFE#PBF 170
10003.83 $
5003.98 $
2504.08 $
1004.13 $
255.19 $
17.82 $
Buy Now
LTC3855EUJ#PBF 51
10003.58 $
5003.72 $
2503.81 $
1003.86 $
254.85 $
17.31 $
Buy Now
LTC3855IFE#PBF 0
1004.71 $
Buy Now
LTC3855IFE#TRPBF 0
20004.81 $
Buy Now
LTC3855EFE#TRPBF 0
20004.23 $
Buy Now
LTC3855EUJ#TRPBF 0
20003.96 $
Buy Now
LTC3855EUJ#TRPBF 0
20003.96 $
Buy Now
show stock=0hide stock=0

Digi-Key

ProductStockPriceBuy
LTC3855EUJ#PBF 3037
1003.80 €
254.60 €
16.92 €
Buy Now
LTC3855IUJ#PBF 2119
1004.28 €
255.18 €
17.81 €
Buy Now
LTC3855EUJ#TRPBF 1495
1004.02 €
254.86 €
17.32 €
Buy Now
LTC3855EUJ#TRPBF 1495
1004.02 €
254.86 €
17.32 €
Buy Now
LTC3855EFE#PBF 245
1004.06 €
254.91 €
17.40 €
Buy Now
DC1441A 4
1181.00 €
Buy Now
DC1617A-A 3
1181.00 €
Buy Now
DC1617A-B 2
1181.00 €
Buy Now
LTC3855EUJ#TRPBF 0
20003.60 €
Buy Now
LTC3855EFE#TRPBF 0
20003.87 €
Buy Now
LTC3855IUJ#TRPBF 0
20004.08 €
Buy Now
LTC3855IFE#TRPBF 0
20004.40 €
Buy Now
LTC3855IFE#PBF 0
1004.68 €
Buy Now
show stock=0hide stock=0

Verical

ProductStockPriceBuy
LTC3855IUJ#PBF 358
10004.04 $
5004.20 $
2504.30 $
1004.36 $
255.47 $
28.25 $
Buy Now
LTC3855EUJ#PBF 225
2503.71 $
1003.80 $
254.59 $
36.92 $
Buy Now
LTC3855EFE#PBF 170
10003.83 $
5003.98 $
2504.08 $
1004.13 $
255.19 $
27.82 $
Buy Now
LTC3855EUJ#PBF 51
10003.58 $
5003.72 $
2503.81 $
1003.86 $
254.85 $
27.31 $
Buy Now

Quest Components

ProductStockPriceBuy
LTC3855IUJ#TRPBF 12
107.50 $
48.25 $
111.25 $
Buy Now

Chip1Stop

ProductStockPriceBuy
LTC3855EUJ#PBF 665
3663.39 $
503.40 $
104.15 $
14.91 $
Buy Now

Available Distributors without stock: 1

Richardson RFPD

ProductStockPriceBuy
LTC3855EUJ#TRPBF 0
20004.13 $
50003.98 $
Buy Now
LTC3855IFE#PBF 0
1505.23 $
5005.09 $
10004.96 $
50004.76 $
Buy Now
LTC3855EFE#PBF 0
1504.58 $
5004.45 $
10004.34 $
50004.17 $
Buy Now
LTC3855IUJ#PBF 0
1224.83 $
5004.70 $
10004.58 $
50004.41 $
Buy Now
LTC3855EFE#TRPBF 0
20004.42 $
50004.24 $
Buy Now
LTC3855EUJ#PBF 0
1834.27 $
5004.16 $
10004.05 $
50003.90 $
Buy Now
LTC3855IUJ#TRPBF 0
20004.66 $
50004.48 $
Buy Now
LTC3855IFE#TRPBF 0
20005.02 $
50004.82 $
Buy Now

Table with equivalents and alternatives

The following Buck Controller are similar to LTC3855. Or, compare LTC3855 side-by-side with other Buck Controller via the Comparison function.

Variation Compare Product Manufacturer Package
25% LTC3850-2 LTC3850-2 product overviewLTC3850-2 product overview Linear Technology SSOP-28

Inductor suggestions

Below you can find matching inductors from Wuerth Elektronik calculated on the maximum parameters of LTC3855.

V-IN max. 38 V, I-OUT 25 A, V-OUT min. 0.6 V, Frequency typ. 770 kHz
Order Code Spec L (µH) IR (A) ISAT (A) RDC (mΩ) L x W x H (mm)
744302010 0.1 30.0 45.0 0.24 6.95 x 6.8 x 4.7
744303012 0.1 31.0 55.0 0.33 10 x 6.8 x 5
744304010 0.1 26.0 52.0 0.17 11.5 x 11.8 x 4
744307012 0.1 29.0 48.0 0.33 7.4 x 7.2 x 7.2
7443081012 0.1 38.0 85.0 0.29 9.4 x 6.2 x 8.1
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