The LM25116 is a synchronous buck controller intended for step-down regulator applications from a high voltage or widely varying input supply. The control method is based upon current mode control using an emulated current ramp. Current mode control provides inherent line feedforward, cycle-by-cycle current limiting and ease of loop compensation. The use of an emulated control ramp reduces noise sensitivity of the pulse-width modulation circuit, allowing reliable control of very small duty cycles necessary in high input voltage applications. The operating frequency is programmable from 50 kHz to 1 MHz. The LM25116 drives external high-side and low-side NMOS power switches with adaptive dead-time control. A user-selectable diode emulation mode enables discontinuous mode operation for improved efficiency at light load conditions. A low quiescent current shutdown disables the controller and consumes less than 10 µA of total input current. Additional features include a high voltage bias regulator, automatic switch-over to external bias for improved efficiency, thermal shutdown, frequency synchronization, cycle-by-cycle current limit and adjustable line undervoltage lockout. The device is available in a power enhanced 20-pin HTSSOP package featuring an exposed die attach pad to aid thermal dissipation.
New products (LM25141, LM5141, LM25148, and LM25149) offer reduced BOM cost, higher efficiency, and reduced design size among many other features.
| Type | Title | Date | ||
|---|---|---|---|---|
| * | Data sheet | LM25116 Wide-Range Synchronous Buck Controller datasheet (Rev. F) | PDF | HTML | 03 Nov 2023 |
| White paper | Valuing wide VIN, low EMI synchronous buck circuits for cost-driven, demanding a (Rev. A) | 10 Apr 2019 | ||
| White paper | Overcoming Challenges in Designing Step-Dwn Reg Apps w/40V Input Voltage (Rev. A) | 03 Jul 2018 | ||
| Selection guide | Power Management Guide 2018 (Rev. R) | 25 Jun 2018 | ||
| Analog Design Journal | Reduce buck-converter EMI and voltage stress by minimizing inductive parasitics | 21 Jul 2016 | ||
| Application note | Automated Frequency Response Analyzer | 09 Oct 2013 | ||
| EVM User's guide | AN-1596 LM5116 Evaluation Board (Rev. C) | 24 Apr 2013 | ||
| EVM User's guide | AN-1617 LM25116 Evaluation Board (Rev. A) | 24 Apr 2013 | ||
| EVM User's guide | AN-1713 LM5116-12 Evaluation Board (Rev. A) | 24 Apr 2013 | ||
| Application note | Minimizing FET Losses For a High Input Rail Buck Converter (Rev. A) | 23 Apr 2013 |
For additional terms or required resources, click any title below to view the detail page where available.
The LM25116 evaluation board is designed to provide the design engineer with a fully functional power converter based on Emulated Current Mode Control to evaluate the LM25116 controller IC. The evaluation board provides a 5V output with a 7A current capability. The wide input voltage ranges from 7V (...)
| Package | Pins | CAD symbols, footprints & 3D models |
|---|---|---|
| HTSSOP (PWP) | 20 | Ultra Librarian |
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