LTC3857 Buck Controller overview

Description

Manufacturer
 
Category
Sub-Category

LTC3857 is a 2 channel, 2 phase sync Buck Controller. The maximum input voltage ranges from 4.00 V to 38.00 V and output current goes up to 25.00 A.

The Controller features adjustable 850 kHz switching frequency which results in a typical inductor size of 0.0 uH and a peak efficiency of %. The LTC3857 is available in 1 package option(s): QFN-32 .

Parameter and features overview

ParameterValueReplacement
Search Filter
Nr. of Channel 2
V-IN min. 4.00 V
V-IN max. 38.00 V
I-OUT? 25.00 A
V-OUT min. 0.80 V
V-OUT max. 24.00 V
V-OUT adjustable
V-OUT programmable
sync/non-sync sync
Frequency typ. 850 kHz
Frequency adj. adjustable
Frequency adj. min. 50 kHz
Frequency adj. max. 900 kHz
ext.clock sync. yes
ext.clock Frequency min. 75 kHz
ext.clock Frequency max. 850 kHz
Softstart
Softstart adjustable
Tracking no
Power Good (PG)
Enable
Operating min.
Operating max.
Junction min.
Junction max.
thermal shutdown typ.
Inductor size typ.
Automotive AEC-Q100
Light-Load Mode yes
Single/ Multiphase multi
Nr. of Phases 2
Peak Efficiency
component count min.
current limit adjustable
Nr.of package options 1
CSP
SOT
MSOP
QFN/DFN QFN-32
SO/SOIC
SOP
DIP

LTC3857 Datasheet

Link to the most up-to-date LTC3857 datasheet and the product page for EVM, tools and support information.

LTC3857

LTC3857 inventory, samples and price

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Available Distributors with stock: 0

no online Distributor with LTC3857 stock available

Available Distributors with stock: 7

Digi-Key

ProductStockPriceBuy
LTC3857EGN-1#PBF 891
1004.67 €
255.65 €
18.51 €
Buy Now
LTC3857EUH#PBF 511
1004.81 €
255.82 €
18.76 €
Buy Now
LTC3857EUH#TRPBF 247
1005.03 €
256.09 €
19.17 €
Buy Now
LTC3857EUH#TRPBF 247
1005.03 €
256.09 €
19.17 €
Buy Now
DC1381A-A 2
1158.25 €
Buy Now
LTC3857EUH#TRPBF 0
25004.57 €
Buy Now
LTC3857EGN-1#TRPBF 0
25004.40 €
Buy Now
LTC3857IGN-1#TRPBF 0
25004.74 €
Buy Now
LTC3857IUH#TRPBF 0
25004.86 €
Buy Now
LTC3857IGN-1#PBF 0
1475.03 €
Buy Now
LTC3857IUH#PBF 0
1465.17 €
Buy Now
show stock=0hide stock=0

Verical

ProductStockPriceBuy
LTC3857EUH#PBF 394
1005.03 $
255.79 $
28.71 $
Buy Now

Mouser Electronics

ProductStockPriceBuy
LTC3857EUH#PBF 292
19.68 $
256.43 $
1005.31 $
2505.04 $
5004.93 $
10004.74 $
Buy Now
LTC3857IUH#PBF 18
110.39 $
256.90 $
1005.70 $
2505.42 $
5005.30 $
10005.09 $
Buy Now
LTC3857EGN-1#PBF 183
19.40 $
256.24 $
1005.16 $
2504.90 $
5004.79 $
10004.60 $
Buy Now

Bristol Electronics

ProductStockPriceBuy
LTC3857EUH#PBF 2376 Buy Now

Quest Components

ProductStockPriceBuy
LTC3857IGN-1#3ZZPBF 1530
7004.10 $
4284.29 $
111.70 $
Buy Now
LTC3857IGN-1#3ZZPBF 1530
7004.10 $
4284.29 $
111.70 $
Buy Now

ComS.I.T.

ProductStockPriceBuy
LTC3857GN1PBF 151

IChunt

ProductStockPriceBuy
LTC3857EUH#TRPBF 247
180.55 CNY
2553.48 CNY
10044.22 CNY
Buy Now

Available Distributors without stock: 3

Arrow Electronics

ProductStockPriceBuy
LTC3857EUH#PBF 0
10004.50 $
5004.68 $
2504.79 $
1464.86 $
Buy Now
LTC3857IUH#TRPBF 0
25005.31 $
Buy Now
LTC3857IGN-1#PBF 0
1005.08 $
985.97 $
Buy Now
LTC3857IUH#PBF 0
10004.84 $
5005.04 $
2505.15 $
1005.21 $
736.56 $
Buy Now
LTC3857IGN-1#TRPBF 0
25005.18 $
Buy Now
LTC3857EGN-1#TRPBF 0
25004.81 $
Buy Now
LTC3857EGN-1#PBF 0
10004.37 $
5004.55 $
2504.66 $
1474.71 $
Buy Now
LTC3857EUH#TRPBF 0
25004.91 $
Buy Now
LTC3857EUH#TRPBF 0
25004.91 $
Buy Now

Richardson RFPD

ProductStockPriceBuy
LTC3857IGN-1#PBF 0
985.96 $
1005.62 $
5005.47 $
10005.32 $
50005.13 $
Buy Now
LTC3857EUH#PBF 0
1465.39 $
5005.24 $
10005.10 $
50004.91 $
Buy Now
LTC3857IUH#PBF 0
736.12 $
1005.78 $
5005.62 $
10005.48 $
50005.26 $
Buy Now
LTC3857EGN-1#TRPBF 0
25005.02 $
50004.82 $
Buy Now
LTC3857EUH#TRPBF 0
25005.18 $
50004.99 $
Buy Now
LTC3857IGN-1#TRPBF 0
25005.41 $
50005.20 $
Buy Now
LTC3857EGN-1#PBF 0
1475.23 $
5005.09 $
10004.96 $
50004.76 $
Buy Now
LTC3857IUH#TRPBF 0
25005.54 $
50005.33 $
Buy Now

Farnell element14

ProductStockPriceBuy
LTC3857EUH#PBF 0
1003.56 GBP
253.91 GBP
16.35 GBP
Buy Now

Table with equivalents and alternatives

The following Buck Controller are similar to LTC3857. Or, compare LTC3857 side-by-side with other Buck Controller via the Comparison function.

Variation Compare Product Manufacturer Package
0% LTC3857-1 LTC3857-1 product overviewLTC3857-1 product overview Linear Technology SSOP-28
0% LTC3858 LTC3858 product overviewLTC3858 product overview Linear Technology QFN-32
0% LTC3858-1 LTC3858-1 product overviewLTC3858-1 product overview Linear Technology QFN-28, SSOP-28
0% LTC3890 LTC3890 product overviewLTC3890 product overview Linear Technology QFN-32
0% LTC3890-1 LTC3890-1 product overviewLTC3890-1 product overview Linear Technology SSOP-28
0% LTC3890-2 LTC3890-2 product overviewLTC3890-2 product overview Linear Technology QFN-32
0% LTC3890-3 LTC3890-3 product overviewLTC3890-3 product overview Linear Technology SSOP-28
10% LTC3773 LTC3773 product overviewLTC3773 product overview Linear Technology QFN-38, SSOP-36
10% LTC3826 LTC3826 product overviewLTC3826 product overview Linear Technology QFN-32
10% LTC3826-1 LTC3826-1 product overviewLTC3826-1 product overview Linear Technology SSOP-28
25% LTC3802 LTC3802 product overviewLTC3802 product overview Linear Technology QFN-32, SSOP-28
25% LTC3858-2 LTC3858-2 product overviewLTC3858-2 product overview Linear Technology QFN-32

Inductor suggestions

Below you can find matching inductors from Wuerth Elektronik calculated on the maximum parameters of LTC3857.

V-IN max. 38 V, I-OUT 25 A, V-OUT min. 0.8 V, Frequency typ. 850 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
744302015 0.2 30.0 32.0 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
744303015 0.2 31.0 42.0 0.33 10 x 6.8 x 5
744304010 0.1 26.0 52.0 0.17 11.5 x 11.8 x 4
744304016 0.2 26.0 32.0 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
744307016 0.2 29.0 41.0 0.33 7.4 x 7.2 x 7.2
744308015 0.2 27.0 58.0 0.37 10.1 x 7 x 7
744325016 0.2 25.0 58.0 0.51 10.5 x 10.2 x 5
744355215 0.2 25.0 60.0 0.58 10.5 x 10.2 x 4.2
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