L5983_08 Datasheet, PDF (1/37 Pages) STMicroelectronics – 1.5 A step-down switching regulator

L5983
1.5 A step-down switching regulator
Features
■ 1.5 A DC output current
■ 2.9 V to 18 V input voltage
■ Output voltage adjustable from 0.6 V
■ 250 kHz switching frequency, programmable
up to 1 MHz
■ Internal soft-start
■ Inhibit
■ Low dropout operation: 100 % duty cycle
■ Voltage feed-forward
■ Zero load current operation
■ Over current and thermal protection
■ VFQFPN8 3 x 3 mm package
Applications
■ Consumer: STB, DVD, DVD recorder, car
audio, LCD TV and monitors
■ Industrial: Chargers, PLD, PLA, FPGA
■ Networking: XDSL, modems, DC-DC modules
■ Computer: Optical storage, hard disk drive,
printers, audio/graphic cards
■ LED driving
Figure 1. Application circuit
VFQFPN8 3 x 3 mm
Description
The L5983 is a step down switching regulator with
2.0 A (min.)current limited embedded power
MOSFET, so it is able to deliver an output current
in excess of 1.5 A DC to the load.
The input voltage can range from 2.9 V to 18 V,
while the output voltage can be set starting from
0.6 V to V_IN. Having a minimum input voltage of
2.9 V, the device is suitable for also for the 3.3 V
bus.
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 VFQFPN package with exposed pad allows
reducing the R_thJA down to approximately
60 °C/W.
September 2008
Rev 4
1/37
www.st.com
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