L5985 Datasheet, PDF (1/36 Pages) STMicroelectronics – 2A step-down switching regulator

L5985
2A step-down switching regulator
Features
■ 2A 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 L5985 is a step down switching regulator with
2.5A current limited embedded power MOSFET,
so it is able to deliver up to 2A 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 for buses staring from
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
1/36
www.st.com
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