Data Sheet
AS1333
650mA, Step Down DC/DC Converter for Portable Applications
1 General Description
2 Key Features
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PWM Switching Frequency: 2MHz
Single Lithium-Ion Cell Operation
Fixed Output Voltage (3.09V)
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.
Maximum load capability of 650mA
High Efficiency (96% Typ at 3.6VIN, 3.09VOUT at
400mA) from internal synchronous rectification
The AS1333 steps down an input voltage of 3.25V to
5.5V to a fixed output voltage of 3.09V.
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Current Overload Protection
Thermal Overload Protection
Soft Start
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.
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
VDD
PVIN
10 µF
3.3 µH
VOUT
3.09V
SW
EN
AS1333
FB
10 µF
AGND
PGND
NC
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