LT3491 LED Boost Driver overview
Description
Manufacturer
Category
Sub-Category
LT3491 is a 1 channel, 12.0 V, 0.02 A/string sync LED Boost Driver. It can drive a maximum of 6 LED (~3.5Vfwd) per string, features a fixed 2300 kHz frequency and is available in 2 package option(s): SC70-8 DFN-6 .
Further characteristics are a feedback voltage of 0.200 V, a typical inductor size of 10.0 uH and a peak efficiency of 76 %.
Parameter and features overview
| Parameter | Value | Replacement Search Filter |
| Nr. of Channel | 1 | |
| V-IN min. | 2.5 V | |
| V-IN max. | 12.0 V | |
| V-OUT max. | 24.0 V | |
| Nr.of LED per string typ. | 6 | |
| I-OUT/string? | 0.02 A | |
| current limit typ. | 0.35 A | |
| sync/non-sync | sync | |
| Frequency typ. | 2300 kHz | |
| Frequency | fixed | |
| Frequency min. | ||
| Frequency max. | ||
| Softstart |  |
|
| Softstart adjustable | |
|
| Down-Mode | |
|
| Quiescent current max. | 4000 uA | |
| Operating min. | -40 °C | |
| Operating max. | 85 °C | |
| Junction min. | ||
| Junction max. | ||
| thermal shutdown typ. | ||
| Inductor size typ. | 10.0 uH | |
| feedback voltage | 0.200 V | |
| Automotive AEC-Q100 | |
|
| Topology | Boost | |
| Peak Efficiency | 76 % | |
| Component count min. | 4 | |
| DC dimming |  |
|
| PWM dimming | |
|
| PWM frequency min. | 0.10 kHz | |
| PWM frequency max. | 10.0 kHz | |
| digital dimming | |
|
| digital interface | |
|
| LED flash | |
|
| TxMask | |
|
| Nr.of current sources | 1 | |
| Nr.of package options | 2 | |
| CSP | ||
| SC70 | SC70-8 | |
| SOT | ||
| MSOP | ||
| QFN/DFN | DFN-6 | |
| SO/SOIC | ||
| SOP | ||
| DIP |
LT3491 Datasheet
Link to the most up-to-date LT3491 datasheet and the product page for EVM, tools and support information.
LT3491 inventory, samples and price
Available Distributors with stock: 0
no online Distributor with LT3491 stock available
Available Distributors with stock: 0
no online Distributor with LT3491 stock available
List with equivalents & alternatives
The following DC/DC LED Boost driver are similar to LT3491. Optional, compare LT3491 side-by-side with other LED driver via the comparison function.
| Variation | Compare | Product | Manufacturer | Package | |
| 0% | ISL97634 |  ISL97634 product overview |
Intersil | TDFN-8 | |
| 0% | LT3591 | LT3591 product overview |
Linear Technology | DFN-8 | |
| 10% | LT3465 | LT3465 product overview |
Linear Technology | TSOT23-6 | |
| 10% | LT3465A | LT3465A product overview |
Linear Technology | TSOT23-6 |
Inductor suggestions
Below you can find matching inductors from Wuerth Elektronik calculated on the maximum parameters of LT3491.
V-IN min. 2.5 V, V-OUT max. 24 V, current limit typ. 0.35 A, Frequency typ. 2300 kHz
| Order Code | Spec | L (µH) | IR (A) | ISAT (A) | RDC (mΩ) | L x W x H (mm) |
| 74404300082 | 0.8 | 3.5 | 3.7 | 14.00 | 4.8 x 4.8 x 3 | |
| 74406900052 | 0.5 | 4.3 | 5.8 | 15.00 | 8 x 8 x 1.5 | |
| 74407000082 | 0.8 | 6.2 | 5.5 | 8.50 | 8 x 8 x 2 | |
| 744089420082 | 0.8 | 3.5 | 6.7 | 21.00 | 4.8 x 4.8 x 3.1 | |
| 744383350082 | 0.8 | 3.5 | 7.0 | 30.00 | 3 x 3 x 1.5 | |
| 744383360068 | 0.7 | 4.5 | 6.2 | 22.00 | 3 x 3 x 2 | |
| 784383350082 | 0.8 | 3.5 | 7.0 | 30.00 | 3 x 3 x 1.5 |
