L7981

L7981 3 A step-down switching regulator Datasheet - production data VFQFPN8 3 x 3 HSOP8 exposed pad 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  VFQFPN 3 x 3 - 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 Description The L7981 device is a step-down switching regulator with a 3.7 A (minimum) current limited embedded Power MOSFET, so it is 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. Figure 1. Application circuit May 2014 This is information on a product in full production. DocID15182 Rev 5 1/42 www.st.com Contents Contents L7981...