FEATURES

? Efficiency up to 96

? Only 40μA (TYP.) Quiescent Current

? Output Current up to 1A

? Internal Synchronous Rectifier

? Switching Frequency: 1.5MHz

? Under-Voltage Lockout

? Soft Start

? Short Circuit Protection

? Thermal Shutdown

? 5-pin Small SOT23-5, DFN2X2 6-Pin and QFN3X3

16-Pin Package

? Pb-Free Package

DESCRIPTION

The ATI2305 is a 1.5MHz switching frequency step-down

current-mode, DC-DC converter. With excellent stability and

transient response, the constant-frequency PWM control

works well at heavy load. There is a power-saving Pulse-

Skipping Modulation (PSM) mode in the ATI2305 which

can reduce quiescent current under light load operation to

save power and ensure the longest battery life in portable

applications.

The ATI2305 allows input voltages from 2.5V to 5.5V,

allowing the use of a single Li+/Li-polymer cell, multiple

Alkaline/NiMH cell, USB, and other standard power sources.

The output voltage can be adjustable from 0.6V to the input

voltage. The part number suffix ATI2305-XX indicates preset

output voltage of 3.3V, 2.8V, 2.5V, 1.8V, 1.5V, 1.2V or

adjustable. Internal power switch and synchronous rectifier

are used by all versions to minimize external part count and

realize high efficiency. During shutdown, the input is

disconnected from the output and the shutdown current is

less than 0.1μA. Other key features include under-voltage

lockout to prevent deep battery discharge.

Three packages are available for ATI2305: SOT23-5,

DFN2X2 6-Pin and QFN3X3 16-Pin.