AS1333 Step-Down Converter IC

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.

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 interference. Shutdown function turns the device off and reduces battery consumption to 0.01μA (typ).

The AS1333 is available in a 8-pin lead free micro SMD package. A high switching frequency (2 MHz) allows use of tiny surface-mount components. Only three small external surface-mount components, an inductor and two ceramic capacitors are required.

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.

Block diagram for AS1333 Step-Down Converter IC