The LM5008 is a high voltage (100V) step-down switching regulator that features all of the functions needed to implement a low cost, efficient, Buck bias regulator. It is easy to implement and is provided in the MSOP-8 and the thermally enhanced LLP-8 packages. The regulator is based on a hysteretic control scheme using an ON time inversely proportional to VIN. This feature allows the operating frequency to remain relatively constant. The hysteretic control requires no loop compensation. An intelligent current limit is implemented with forced OFF time, which is inversely proportional to Vout. This scheme ensures short circuit protection while providing min- imum foldback. Other protection features include: Thermal Shutdown, VCC under-voltage lockout, Gate drive under-volt- age lockout, and Max Duty Cycle limiter.
The LM5008 high‑voltage step‑down switching regulator provides a low‑cost, efficient buck converter solution. It uses a hysteretic control scheme where the on‑time varies inversely with line voltage, eliminating the need for loop compensation. The device includes an internal 100 V N‑channel buck switch and is offered in MSOP‑8 and thermally enhanced LLP‑8 packages.
Typical applications include 48 V telecom and 42 V automotive power‑bus systems. Protection features comprise thermal shutdown, under‑voltage lockout, gate‑drive UVLO, and a max‑duty‑cycle limiter. The regulator’s output voltage is adjustable, with a default regulated output of about 7 V.
| Input voltage range | 9.5 V to 95 V |
|---|---|
| Buck switch voltage rating | 100 V |
| Current limit threshold | 0.41 A to 0.61 A |
| Thermal shutdown temperature | 165 °C |
The LM5008 operates with an input voltage from 9.5 V up to 95 V.
The device is offered in MSOP‑8 and thermally enhanced LLP‑8 packages.