LM3691-1.5 Buck Converter overview
Description
LM3691-1.5 is a 5.50 V sync Buck Converter from with 1.00 A output current. The maximum 5.50 V input voltage can be regulated down into a 1.50 V to 1.50 V output voltage.
It requires are a typical inductor size of 1.00 µH, a typical external component count of 3 and achieves a peak efficiency of 93 %. Further LM3691-1.5 characteristics are a fixed 4000 kHz switching frequency and 1 available package option(s): DSBGA-6 .
Parameter overview and features with replacement search
For the LM3691-1.5 replacement search, please select a main parameter tolerance value and adjust the checkboxes for feature match. The product counter within the button shows the number of available equivalents and a click on the replacement button shows all possible replacements within a parametric overview.
| Parameter | Value | Replacement Search Filter |
| V-IN min. | 2.30 V | |
| V-IN max. | 5.50 V | |
| I-OUT? | 1.00 A | |
| V-OUT min. | 1.50 V | |
| V-OUT max. | 1.50 V | |
| V-OUT | 1.500 V | |
| V-OUT programmable |  |
|
| sync/non-sync | sync | |
| Frequency typ. | 4000 kHz | |
| Frequency | fixed | |
| Frequency selectable | ||
| ext.clock sync. | |
|
| Frequency adj./ ext.clock min. | ||
| Frequency adj./ ext.clock max | ||
| Softstart |  |
|
| Softstart adjustable | |
|
| Tracking | |
|
| PG/Power OK | |
|
| Quiescent current max. | 600 µA | |
| Operating min. | -30 °C | |
| Operating max. | 85 °C | |
| Junction min. | -30 °C | |
| Junction max. | 125 °C | |
| thermal shutdown typ. | 150 °C | |
| Inductor size typ. | 1.00 µH | |
| Inductor suggested by Würth Elektronik | ||
| Automotive AEC-Q100 | |
|
| Light-Load-Mode | |
|
| Topology | Buck | |
| Peak Efficiency | 93 % | |
| Component count min. | 3 | |
| current limit adjustable | |
|
| Nr.of packages | 1 | |
| CSP | DSBGA-6 | |
| SC70 | ||
| SOT | ||
| MSOP | ||
| QFN/DFN | ||
| SO/SOIC | ||
| SOP | ||
| DIP | ||
| TO | ||
| DDPAK |
LM3691-1.5 Datasheet
Link to the most up-to-date LM3691-1.5 datasheet and the product page for EVM, tools and support information.
LM3691-1.5 Sample stock and distributor price breaks
LM3691-1.5 prices and online available distributors.
Available Distributors with stock: 0
Available Distributors with stock: 0
List of equivalents and alternatives
The following DC/DC Buck Converter are similar to LM3691-1.5. Optional, compare LM3691-1.5 side-by-side with other Buck Converter via the Comparison function.
Inductor suggestions
Below you can find matching inductors from Wuerth Elektronik calculated on the maximum parameters of LM3691-1.5.
| Order Code | Spec | L (µH) | IR (A) | ISAT (A) | RDC (mΩ) | L x W x H (mm) |
| 74402800082 | 0.8 | 2.0 | 1.6 | 53.00 | 2.8 x 2.8 x 1.2 | |
| 744028001 | 1.0 | 1.8 | 1.5 | 65.00 | 2.8 x 2.8 x 1.2 | |
| 74402900082 | 0.8 | 2.4 | 1.8 | 36.00 | 2.8 x 2.8 x 1.5 | |
| 744029001 | 1.0 | 2.2 | 1.6 | 45.00 | 2.8 x 2.8 x 1.5 | |
| 7440300068 | 0.7 | 1.3 | 1.5 | 0.06 | 3.3 x 3.5 x 1.05 | |
| 744031010 | 1.0 | 2.0 | 1.6 | 26.00 | 3.8 x 3.8 x 1.8 | |
| 74404024010 | 1.0 | 2.2 | 2.6 | 37.00 | 2.5 x 2 x 1.2 | |
| 74404032010 | 1.0 | 2.2 | 3.0 | 33.00 | 3 x 3 x 1.5 | |
| 74404200056 | 0.6 | 3.1 | 3.0 | 19.00 | 4.8 x 4.8 x 2 | |
| 744042001 | 1.0 | 2.7 | 2.6 | 20.00 | 4.8 x 4.8 x 2 | |
| 74438321010 | 1.0 | 1.3 | 2.5 | 163.00 | 2.5 x 2 x 0.6 | |
| 74479262210 | 1.0 | 1.2 | 1.7 | 170.00 | 1.6 x 0.8 x 0.8 | |
| 74479275210 | 1.0 | 1.8 | 2.1 | 69.00 | 2 x 1.25 x 1 | |
| 74479276210 | 1.0 | 2.0 | 2.5 | 65.00 | 2 x 1.6 x 1 | |
| 74479876168 | 0.7 | 1.8 | 1.7 | 60.00 | 2 x 1.6 x 1 | |
| 74479876210 | 1.0 | 1.5 | 1.5 | 70.00 | 2 x 1.6 x 1 | |
| 74479889210 | 1.0 | 2.0 | 2.0 | 85.00 | 2.5 x 2 x 1.2 | |
| 74479899210 | 1.0 | 2.3 | 2.5 | 50.00 | 3.2 x 2.6 x 1.2 | |
| 74479974156 | 0.6 | 1.7 | 2.4 | 80.00 | 2 x 1.2 x 0.5 | |
| 74479976210 | 1.0 | 1.8 | 2.4 | 75.00 | 2 x 1.6 x 0.5 | |
| 74479977156 | 0.6 | 2.1 | 2.3 | 65.00 | 2 x 1.6 x 0.9 | |
| 74479977182 | 0.8 | 2.0 | 2.0 | 90.00 | 2 x 1.6 x 0.9 | |
| 78438321010 | 1.0 | 1.3 | 2.5 | 163.00 | 2.5 x 2 x 0.6 |
