AS1333 - austriamicrosystems AG

AS1333 650mA Step Down DC/DC Converter

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. The AS1333 steps down an input voltage of 3.25V to 5.5V to a fixed output voltage of 3.09V. Fixed-frequency PWM operation minimizes RF .

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 ! ! ! ! ! 3 Applications The AS1333 is an ideal solution for cellular phones, hand-held radios, RF PC cards, battery powered RF devices, and RFIC chipsets. Figure 1. Typical Application Circuit VIN 10 µF PVIN VDD 3.3 µH EN SW VOUT 3.09V AS1333.