STMicroelectronics L7980

Description

The L7980 device is a step-down switching regulator with a 2.5 A (minimum) current limited embedded Power MOSFET, so it is able to deliver up to 2 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 externallyadjusted 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

• 2 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

Remarks

• 27uH inductor value is added from design example, refer page number 22
• Suggested inductor values ranges also given table 7 from page number 17
• Output current to be taken from general value. i.e 2A
• Some of the Product and series to be added nearest inductor values rangesREMARKS:-Table 7.inductors

Typical applications

• Networking: XDSL, modems, DC-DC modules
• LED driving
• Industrial:PLD, PLA, FPGA, chargers
• Consumer:STB, DVD, DVD recorder, car audio, LCD
• Computer:Optical storage, hard disk drive, printers,

More information

• Datasheet
• IC product information