General Description

The AS1333 is a step-down DC-DC converter designed to power portable applications from a single Li-Ion battery. The device also achieves high-performance in mobile phones and other applications requiring low dropout voltage.

Key Features

■ PWM Switching Frequency: 2MHz

■ Single Lithium-Ion Cell Operation

■ Fixed Output Voltage (3.09V)

■ Maximum load capability of 650mA

■ High Efficiency (96 Typ at 3.6VIN, 3.09VOUT at 400mA) from internal synchronous rectification

■ Current Overload Protection

■ Thermal Overload Protection

■ Soft Start

■ Low Dropout Voltage (140 mΩ Typ PFET)

■ 8-pin WL-CSP

Applications

The AS1333 is an ideal solution for cellular phones, hand-held radios, RF PC cards, battery powered RF devices, and RFIC chipsets.