AS1332 Step-Down Converter IC

Description

The AS1332 is a step-down DC-DC converter designed to power radio frequency (RF) power amplifiers (PAs) from a single Li-Ion battery. The device also achieves high-performance in mobile phones and similar RF PA applications.

The AS1332 steps down an input voltage of 2.7V to 5.5V to output voltages ranging from 1.3V to 3.16V. Using a VCON analog input, the output voltage is set for controlling power levels and efficiency of the RF PA.

The RF interferences are minimized due to the fixed frequency PWM operation. The battery consumption is reduced to 0.01μA (typ.) during shutdown.

Because of the high switching frequencies (2 MHz), tiny surface-mount components can be used. Additional to the small size the amount is also small. Only three external components are requiered, an inductor and two ceramic capacitors.

The AS1332 is available in a 8-pin WL-CSP.

Key Features

• Single Lithium-Ion Cell Operation (2.7V to 5.5V)
• Dynamic Programmable Output Voltage (1.3V to 3.16V)
• PWM Switching Frequency: 2MHz
• Maximum load capability of 650mA
• High Efficiency (96% Typ at 3.6VIN, 3.16VOUT at 400mA) from internal synchronous rectification
• Current Overload Protection
• Thermal Overload Protection
• Soft Start
• 8-pin WL-CSP

Applications

The AS1332 is an ideal solution for cellular phones, hand-held radios, RF PC cards, and battery powered RF devices.

Block diagram for AS1332 Step-Down Converter IC