STMicroelectronics L7981
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. The QFN and the HSOP packages with exposed pad allow reducing the RthJA down to 60°C/W and 40°C/W respectively.| Part No. | L7981 |
|---|---|
| Datasheet | L7981 Download |
| Manufacturer |  STMicroelectronics |
| Description | 3A step-down switching regulator |
| Buy | Stock & Price |
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
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. Figure 1. Application circuit May 2014 This is information on a product in full production. DocID15182 Rev 5 1/42 Contents Contents L7981 1 Pin settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
