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AIC2862

2A 23V Synchronous PWM/PSM Step-Down Converter with High Light-load Efficiency

FEATURES
  • 2A Continuous Output Current
  • Wide 4.75V to 23V Operating Input Range
  • Ouput Adjustable from 0.925V to 12V
  • Up to 89% Efficiency for Heavy Load(Vin=12V, Vout=3.3V, Iout=2.0A)
  • Up to 92% Efficiency for Moderate Load(Vin=12V, Vout=3.3V, Iout=1.0A)
  • Up to 81% Efficiency for Light Load(Vin=12V, Vout=3.3V, Iout=20mA)
  • Low Rds(on) Internal Switches: 140mOhm and 120mOhm
  • <3uA Supply Current in Shutdown Mode
  • 340KHz/550KHz Frequency
  • Programmable Soft Start
  • Thermal Shutdown
  • Cycle by Cycle Over Current Protection
  • Under Voltage Lockout
  • Short Circuit Protection
  • Over Voltage Protection
APPLICATIONS
  • Networking Systems such as Modems & Routers
  • Distributed Power Systems
  • Pre-Regulator for Linear Regulators
  • Set-top Box
DESCRIPTION
The AIC2862 is a 2A synchronous-rectified Buck converter with integrated low Rds(on) power MOSFETs. The AIC2862, designed with a cur-rent-mode control scheme, can convert wide in-put voltage to the adjustable output voltage to provide excellent output voltage regulation. It is stable with low ESR output ceramic capacitors.
For high efficiency over all load current range, the
AIC2862 is equipped with an automatic PSM/PWM modeoperation. At light load, the IC operates in the PSM (Pulse Skipping Mode) to reduce switching losses. At heavy load, the IC works in PWM mode to provide high efficiency and excellent output voltage regulation.
The AIC2862 is also equipped with softstart and whole protections (under-voltage, over-voltage, over-temperature, short circuit and current-limit) into a single package.
This device, available in SOP-8 package, provides a very compact system solution with mini-mal external components and PCB area.
TYPICAL APPLICATION


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