AS1333 Step-Down Converter IC
DC-DC Step-Down Converter 650mA for RF PA supply
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.
