AS1333

www.DataSheet4U.com AS1333 1 General 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 WL-CSP 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. D a ta S he 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 P o r ta b l e A p p l i c a t i o n s 2 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 ! ! ! ! ! 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 FB 10 µF PGND N...