AS1332 Datasheet | austriamicrosystems AG

.. AS1332 1 General Description The AS1332 is a step-down DC-DC converter designed to power radiofrequency (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 fixedfrequency PWM operation. The battery consumption is reduced to 0.01µA (typ.) during shutdown. Because of the high switching frequencies (2 MHz) tiny surface-mount ponents can be used. Additional to the small size the amount is also small. Only three external ponents are required, an inductor and two ceramic capacitors. The AS1332 is available in a 8-pin WL-CSP. D a ta s h e e t 6 5 0 m A , St e p - D o w n D C - D C C o n v e r t e r f o r R F P o w e r A m p l i f i e r s 2 Key Features ! ! ! PWM Switching Frequency: 2MHz Single Lithium-Ion Cell Operation (2.7V to 5.5V) Dynamic Programmable Output Voltage (1.3V to 3.16V) 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 ! ! ! ! ! ! 3 Applications The AS1332 is an ideal solution for cellular phones, hand-held radios, RF PC cards, and battery powered RF devices. Figure 1. Typical Application Circuit VIN 2.7V to 5.5V PVIN VDD VOUT 1.3V to 3.16V 10 µF 3.3 µH EN SW AS1332 FB 4.7 µF VOUT = 2.5 x VCON VCON 0.52V to 1.27V VCON PGND AGND .austriamicrosystems. Revision 1.01 1 - 19...