The L7981 is a step-down switching regulator with a DC output current of 3A, an input voltage range of 4.5V to 28V, an adjustable output voltage starting from 0.6V, a switching frequency of 250kHz (programmable up to 1MHz), internal soft-start and enable functions, low dropout operation, voltage feed-forward, zero load current operation, overcurrent and thermal protection, etc. It is suitable for consumer electronics, industrial equipment, networking devices, and computer applications, and is suitable for LED driving.
The L7981 is a step-down switching regulator with an embedded power MOSFET capable of delivering up to 3A of output current. It operates with an input voltage range of 4.5V to 28V and features an adjustable switching frequency from 250 kHz up to 1 MHz. The device includes internal protection mechanisms such as overcurrent, thermal shutdown, and soft-start, along with voltage feed-forward for improved transient response.
| Output current | 3 A |
|---|---|
| Input voltage range | 4.5 V to 28 V |
| Output voltage range | 0.6 V to V IN |
| Switching frequency | 250 kHz to 1 MHz |
| Maximum limiting current | 3.7 A |
| Thermal resistance (VFQFPN) | 60 °C/W |
| Thermal resistance (HSOP) | 40 °C/W |
The device works at a free-running frequency of 250 kHz, which can be increased up to 1 MHz by connecting an external resistor to the FSW pin.
The L7981 is available in VFQFPN3x3-8L and HSOP8 packages.
The maximum junction temperature range is 150 °C.