DESCRIPTION

The XR1151 step-up switching regulator

generates an output voltage of up to 6V

from an input voltage as low as 1.6V. Ideal

for applications where space is limited, it

switches at 1.2MHz, allowing the use of

tiny, low cost and low profile external

components. Its internal 2A, 100mΩ

NMOS switch provides high efficiency even

at heavy load, while the constant frequency,

current mode architecture results in low,

predictable output noise that is easy to

filter. Internal frequency compensation is

designed to accommodate ceramic output

capacitors, further reducing noise. The

device features very low shutdown current

of 0.5uA.

The XR1151 is available in the 6-lead

SOT-23 package.

FEATURES

• Internal 2A MOSFET Switch

• 1.2MHZ Switching Frequency

• Integrated Soft-Start

• Low 1.6V Vin Operation

• Low Rds on ( )Switch :100mΩ at 5V Output

• Delivers 5V at 800mA from a 3.3V input

• Delivers 3V at 800mA from a 2.5V input

• Uses Small.Low Profile External Components

• Low profile(1mm):SOT-23(Thin SOT)package

APPLICATIONS

• White LED Driver Supply

• Local 3.3V or 5V supply

• Battery Back-up