Description
The L7981 is a step down switching regulator with 3.7 A (minimum) current limited embedded power MOSFET, so it si able to deliver up to 3 A current to the load depending on the application conditions. The input voltage can range from 4.5 V to 28 V, while the output voltage can be set starting from 0.6 V to VIN. Requiring a minimum set of external components, the device includes an internal 250 kHz switching frequency oscillator that can be externally adjusted up to 1 MHz. The QFN and the HSOP packages with exposed pad allow reducing the RthJA down to 60°C/W and 40°C/W respectively.

Features
■ 3 A DC output current
■ 4.5 V to 28 V input voltage
■ Output voltage adjustable from 0.6 V
■ 250 kHz switching frequency, programmable up to 1 MHz
■ Internal soft-start and enable
■ Low dropout operation: 100% duty cycle
■ Voltage feed-forward
■ Zero load current operation
■ Overcurrent and thermal protection
■ VFQFPN3x3-8L and HSOP8 package

Applications
■ Consumer: STB, DVD, DVD recorder, car audio, LCD TV and monitors
■ Industrial: PLD, PLA, FPGA, chargers
■ Networking: XDSL, modems, DC-DC modules
■ Computer: Optical storage, hard disk drive, printers, audio/graphic cards
■ Suitable for LED driving