The LM3691 step-down DC-DC converter is optimized for powering ultra-low-voltage circuits from a single Li-Ion cell or 3 cell NiMH/NiCd batteries. It provides up to 1-A load current over an input voltage range from 2.3 V to 5.5 V. There are several different fixed voltage output options available.
The LM3691 has a mode-control pin that allows the user to select Forced PWM mode or ECO mode that changes modes between gated PWM mode and PWM automatically, depending on the load. In ECO mode, the device offers superior efficiency and very low IQ under light load conditions. ECO mode extends the battery life through reduction of the quiescent current during light load conditions and system standby.
The LM3691 is available in a 6-pin DSBGA package. Only three external surface-mount components, a
1-μH inductor, a 4.7-μF input capacitor, and a 4.7-μF output capacitor, are required.
| Type | Title | Date | ||
|---|---|---|---|---|
| * | Data sheet | LM3691 High-Accuracy, Miniature 1-A Step-Down DC-DC Converter for Portable Applications datasheet (Rev. J) | PDF | HTML | 17 Dec 2015 |
| Application note | Semiconductor and IC Package Thermal Metrics (Rev. D) | PDF | HTML | 25 Mar 2024 | |
| Selection guide | Power Management Guide 2018 (Rev. R) | 25 Jun 2018 | ||
| EVM User's guide | AN-1772 LM3691 Evaluation Board (Rev. B) | 30 Apr 2013 | ||
| Application note | AN-2162 Simple Success With Conducted EMI From DC-DC Converters (Rev. C) | 24 Apr 2013 | ||
| Application note | AN-1566 Techniques for Thermal Analysis of Switching Power Supply Designs (Rev. A) | 23 Apr 2013 | ||
| Application note | AN-1889 How to Measure the Loop Transfer Function of Power Supplies (Rev. A) | 23 Apr 2013 | ||
| Application note | AN-2155 Layout Tips for EMI Reduction in DC/ DC Converters (Rev. A) | 23 Apr 2013 | ||
| More literature | SEM1600 Topic 4: Constructing Your Power Supply – Layout Considerations | 12 Jul 2005 | ||
| Application note | AN-643 EMI/RFI Board Design (Rev. B) | 03 May 2004 |
For additional terms or required resources, click any title below to view the detail page where available.
The LM3691 step-down DC-DC converter is optimized for powering ultra-low voltage circuits from a single Li-Ion cell or 3 cell NiMH/NiCd batteries. It provides up to 1A load current, over an input voltage range from 2.3V to 5.5V. There are several different fixed voltage output options available.
The (...)
| Package | Pins | CAD symbols, footprints & 3D models |
|---|---|---|
| DSBGA (YZR) | 6 | Ultra Librarian |
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