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AIC2873B

3A 17V Synchronous Step-Down Converter with AOT Control

FEATURES
  • Adaptive On Time Control
  • Wide 4.5V to 17V Operating Input Range
  • Output Adjustable from 0.9V to 5V
  • 3A Continuous Output Current
  • Pin-Selectable Output Voltage (Nominal, + 5%)
  • Programmable Soft Start and Tracking
  • Seamless Power Save Mode Transition
  • Quiescent Current of 30uA (Typical)
  • Selectable Operating Frequency
  • Power Good Output
  • 100% Duty Cycle Mode
  • Short Circuit Protection
  • Over Temperature Protection
  • Over Voltage Protection with Latch
  • Up to 91% efficiency
  • Fast Transient Response
  • Available in a QFN-16 (3x3x0.75-0.5) Package
APPLICATIONS
  • Standard 12-V Rail Supplies
  • POL Supplies from Single or Multiple Li-Ion Batteries
  • LDO Replacements
  • Mobile PC's, Tablets, Modems, Cameras
  • Digital TV Power Supply
  • Networking Home Terminal
  • Set Top Box
DESCRIPTION
The AIC2873 is a easy-to-use synchronous step-down DC-DC converter optimized for applications with high power density. A high switching frequency of typically 2.5 MHz allows the use of small inductors and provides fast transient response as well as high output voltage accuracy by use of the AOT control.
With wide operating input voltage range of 4.5 V to 17 V, the AIC2873 is ideally suited for systems powered from either a Li-Ion or other batteries as well as from 12V intermediate power rails. It supports up to 3A continuous output current at output voltages from 0.9 V to 5 V (with 100% duty cycle mode).
The output voltage startup ramp is controlled by the soft-start pin, which allows operation as either a standalone power supply or in tracking configurations. Power sequencing is also possible by configuring the Enable and open-drain power good pins.
In power save mode, the AIC2873 draws quies-cent current of about 30 uA from VIN. Power save mode, entered automatically and seamlessly if load is small, maintains high efficiency over the entire load range. In shutdown Mode, the AIC2873 is turned off and shutdown current consumption is less than 2uA.
The AIC2873 is packaged in a QFN-16 (3x3x0.75-0.5).
TYPICAL APPLICATION


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