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
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PWM Switching Frequency: 2MHz
Single Lithium-Ion Cell Operation
Fixed Output Voltage (3.09V)
Maximum load capability of 650mA
High Efficiency (96% Typ at 3.6V
IN
, 3.09V
OUT
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
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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
V
IN
10 µF
PVIN
VDD
3.3 µH
EN
SW
V
OUT
3.09V
AS1333
FB
10 µF
PGND
NC
AGND
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