The LM51770 is a four switch buck-boost controller. The device provides a regulated output voltage if the input voltage is higher, equal, or lower than the adjusted output voltage. In power save mode, the device supports high efficiency with low output loads due to its low quiescence currents. In power save mode, the device supports high efficiency close to 99% efficiency over the full range of the output currentThe LM51770 runs at a fixed switching frequency, which can be set through the RT or SYNC pin. The switching frequency remains the same during buck, boost, and buck-boost operation. The integrated and optional average current monitor can help monitor and limit input and output current of the LM51770. This feature also supports charging backup power elements, like batteries or capacitors, with constant current (CC) and constant voltage (CV).
| Typ | Titel | Datum | ||
|---|---|---|---|---|
| * | Data sheet | LM51770 78-V Wide VIN Bidirectional 4-Switch Buck-Boost Controller datasheet | PDF | HTML | 06 Dez 2024 |
| Application brief | Current Monitoring with Positive and Negative Currents on LM5177x Devices (Rev. A) | PDF | HTML | 25 Nov 2024 | |
| Application note | Reverse Current Operation of the LM5177 Buck-Boost Converter | PDF | HTML | 16 Jul 2024 | |
| Application note | Parallel Operation of the Buck-Boost Converters Using LM5177 Buck-Boost Controller (Rev. A) | PDF | HTML | 27 Feb 2024 | |
| Application brief | A Simple Constant Voltage Regulation Using the MODE Pin (Rev. A) | PDF | HTML | 15 Feb 2024 | |
| Application note | Layout Optimization of 4-Switch Buck-Boost Converters | PDF | HTML | 05 Sep 2023 | |
| Application brief | Precise Current Limiter Over Wide Operation Voltages in Buck-Boost Converters | PDF | HTML | 05 Sep 2023 | |
| Application brief | Dynamic Current Tracking With the LM5177 4-Switch Buck Boost Controller | 24 Feb 2023 | ||
| Application brief | Constant Current Operation Using the Internal Current Limiter | 27 Jan 2023 |
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| Gehäuse | Pins | CAD-Symbole, Footprints und 3D-Modelle |
|---|---|---|
| HTSSOP (DCP) | 38 | Ultra Librarian |
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The LM51770 BuckBoost Quickstart Calculator tool supports you defining the power stage using the LM51770 and to select the required external components.