LTC3855 Buck Controller overview
Description
Manufacturer
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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
| Parameter | Value | Replacement 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. |  |
|
| ext.clock Frequency min. | 250 kHz | |
| ext.clock Frequency max. | 770 kHz | |
| Softstart | ||
| Softstart adjustable | ||
| Tracking | |
|
| 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 inventory, samples and price
Available Distributors with stock: 0
no online Distributor with LTC3855 stock available
Available Distributors with stock: 0
no online Distributor with LTC3855 stock available
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 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 |
