L5980 Datasheet, PDF (1/37 Pages) STMicroelectronics – 0.7A step-down switching regulator

L5980
0.7A step-down switching regulator
Features
„ 0.7A DC output current
„ 2.9V to 18V input voltage
„ Output voltage adjustable from 0.6V
„ 250kHz switching frequency, programmable
up to 1MHz
„ Internal soft-start and inhibit
„ Low dropout operation: 100% duty cycle
„ Voltage feed-forward
„ Zero load current operation
„ Over current and thermal protection
„ VQFN3x3-8L package
Applications
„ Consumer:
STB, DVD, DVD recorder, car audio, LCD TV
and monitors
„ Industrial:
Chargers, car battery, PLD, PLA, FPGA
„ Networking: XDSL, modems, DC-DC modules
„ Computer:
Optical storage, hard disk drive, printers,
audio/graphic cards
Figure 1. Application circuit
VFQFPN8 3x3
Description
The L5980 is step down switching regulator with
1A current limited embedded power MOSFET, so
it is able to deliver in excess of 0.7A DC current to
the load depending on the application condition.
The input voltage can range from 2.9V to 18V,
while the output voltage can be set starting from
0.6V to V_IN. Having a minimum input voltage of
2.9V, the device is suitable also for 3.3V bus.
Requiring a minimum set of external components,
the device includes an internal 250kHz switching
frequency oscillator that can be externally
adjusted up to 1MHz.
The QFN package with exposed pad allows
reducing the R_thJA down to approximately
60°C/W.
October 2007
Rev 2
1/37
www.st.com
37