LM5010A is an enhanced version of LM5010, with the input operating range extended to 6V minimum. It has all the functions needed to implement a low cost, efficient, buck regulator capable of supplying in excess of 1A load current. It integrates an N-Channel Buck Switch and is available in thermally enhanced LLP-10 and TSSOP-14EP packages. It requires no loop compensation resulting in fast load transient response and simplified circuit implementation. It is suitable for applications including non-isolated telecommuication systems, power conversion, and small portable devices.
The LM5010A step‑down switching regulator from National Semiconductor integrates an 80 V N‑channel buck switch and operates over a wide 6 V to 75 V input voltage range. It delivers more than 1 A load current, features valley‑current limiting at about 1.25 A, and provides programmable switching frequencies up to 1 MHz.
The device is offered in thermally enhanced LLP‑10 and TSSOP‑14EP packages, includes thermal shutdown, VCC under‑voltage lock‑out, gate‑drive UVLO, and a constant‑on‑time control scheme that eliminates the need for external loop compensation. Detailed pin descriptions, absolute‑maximum ratings, and electrical characteristics are provided for designers.
| Input Voltage Range | 6 V to 75 V |
|---|---|
| Valley Current Limit | 1.25 A (typical 1.254 A) |
| Maximum Switching Frequency | Up to 1 MHz |
| Integrated Buck Switch Voltage Rating | 80 V N‑Channel |
| Thermal Shutdown Temperature | 175 °C |
| UVLO Threshold (VCC) | 5.25 V |
The LM5010A operates with an input voltage from 6 V up to 75 V.
The device can be programmed to switch at frequencies up to 1 MHz.
The regulator limits the valley current to about 1.25 A (typical 1.254 A).