The LM5118 is a wide voltage range Buck-Boost controller from TI that uses the minimum external components to achieve high performance and high cost-effective Buck-Boost regulator. When the input voltage is less than the output voltage, the LM5118 operates in Buck mode, and when the input voltage is greater than the output voltage, the LM5118 operates in Buck-Boost mode. The LM5118 integrates high side and low side MOSFET drivers, supports current mode control, and provides overcurrent protection, thermal shutdown and enable input protection functions.
The LM5118 is a wide voltage range buck‑boost switching regulator controller designed for high‑performance, cost‑efficient power conversion. It operates as a buck regulator when the input voltage exceeds the output and smoothly transitions to buck‑boost mode as the input approaches the output, making it well‑suited for automotive applications. The controller includes high‑side and low‑side MOSFET drivers, emulated current‑mode control, and protection features such as current limit and thermal shutdown.
The device is supplied in a TSSOP‑20EP package with an exposed die‑attach pad for thermal dissipation. Detailed pin descriptions, absolute maximum ratings, electrical characteristics, and typical performance graphs are provided, along with ordering information and application circuit examples.
| Input voltage range | 3 V to 75 V |
|---|---|
| Feedback reference accuracy | 1.5 % |
| Thermal shutdown temperature | 165 °C |
| Package type | TSSOP‑20EP (exposed pad) |
The LM5118 is supplied in a 20‑pin TSSOP‑20EP package with an exposed pad.
The UVLO rising threshold is typically between 1.191 V and 1.271 V.
It includes current limit, thermal shutdown, and an enable input for protection.