The LM51770-Q1 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 current. The LM51770-Q1 runs at a fixed switching frequency, which is 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 helps monitor and limit input and output current of the LM51770-Q1. This feature also supports charging backup power elements, like batteries or capacitors, with constant current (CC) and constant voltage (CV).
| Type | Title | Date | ||
|---|---|---|---|---|
| * | Data sheet | LM51770-Q1 80V Wide VIN Bidirectional 4-Switch Buck-Boost Controller datasheet | PDF | HTML | 09 Sep 2025 |
| Functional safety information | LM51770-Q1 Functional Safety FIT Rate and FMD | PDF | HTML | 15 Jul 2025 | |
| Application note | Layout Optimization of 4-Switch Buck-Boost Converters | PDF | HTML | 05 Sep 2023 |
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| Package | Pins | CAD symbols, footprints & 3D models |
|---|---|---|
| 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.