DESCRIPTION
The  AIC1555  is  a  low-noise  pulse-width modulated (PWM) DC-DC step-down converter. It  powers  logic  circuits  in  PDAs  and  small wireless  systems  such  as  cellular  phones, handy-terminals.

FEATURES 
95% Efficiency or up
700mA Guaranteed Output Current.
Adjustable Output Voltage from 0.75V to VIN of a range from +2.5V to 6.5V.
Very Low Quiescent Current: 35µA (Typ.).
Fixed-  500KHz  or  Adjustable  Frequency Synchronous PWM Operation.
Synchronizable external Switching Frequency up to 1MHz.
Constant Over-current-protection mode.
Accurate Reference: 0.75V (±2.5%).
100% Duty Cycle in Dropout.
Low Profile 8-Pin MSOP Package.