L5981 [STMicroelectronics]

L5981 Description

The L5981 is a step-down switching regulator with a 1.5 A (min.) current restricted integrated Power MOSFET that can deliver more than 1 A DC current to the load depending on the application. The input voltage can be set between 2.9 V and 18 V, while the output voltage can be set between 0.6 V and VIN. With a minimum input voltage of 2.9 V, the L5981 can also be used on a 3.3 V bus.

The L5981, which requires only a few external components, features an internal 250 kHz switching frequency oscillator that can be externally modified up to 1 MHz.

L5981 Features

• 1A DC output current

• 2.9 V to 18 V input voltage

• Output voltage adjustable from 0.6 V

• 250 kHz switching frequency, programmable up to 1 MHz

• Internal soft-start and inhibit

• Low dropout operation: 100 % duty cycle

• Voltage feed-forward

• Zero loads current operation

• Overcurrent and thermal protection

• VFQFPN8 3 mm x 3 mm package

L5981 Applications

• LED driving

• Consumer: STB, DVD, DVD recorder, car audio, LCD TV, and monitors

• Industrial: chargers, PLD, PLA, FPGA

• Networking: XDSL, modems, DC-DC modules

• Computer: optical storage, hard disk drive, printers, audio/graphic cards