Datasheet
AS1332
650mA, Step-Down DC-DC Converter for RF Power Amplifiers
1 General Description
2 Key Features
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PWM Switching Frequency: 2MHz
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.
Single Lithium-Ion Cell Operation (2.7V to 5.5V)
Dynamic Programmable Output Voltage (1.3V to
3.16V)
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Maximum load capability of 650mA
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
High Efficiency (96% Typ at 3.6VIN, 3.16VOUT at
400mA) from internal synchronous rectification
controlling power levels and efficiency of the RF PA.
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Current Overload Protection
Thermal Overload Protection
Soft Start
The RF interferences are minimized due to the fixed-
frequency PWM operation. The battery consumption is
reduced to 0.01µA (typ.) during shutdown.
8-pin WL-CSP
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 required, an inductor and two
ceramic capacitors.
3 Applications
The AS1332 is an ideal solution for cellular phones,
hand-held radios, RF PC cards, and battery powered RF
devices.
The AS1332 is available in a 8-pin WL-CSP.
Figure 1. Typical Application Circuit
VIN
2.7V to 5.5V
VDD
PVIN
10 µF
VOUT
3.3 µH
1.3V to 3.16V
SW
FB
EN
VOUT = 2.5 x VCON
AS1332
4.7 µF
VCON
0.52V to 1.27V
VCON
PGND
AGND
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