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
V
CON
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 fixed-
frequency PWM operation. The battery consumption is
reduced to 0.01µA (typ.) during shutdown.
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.
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
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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 3.6V
IN
, 3.16V
OUT
at
400mA) from internal synchronous rectification
Current Overload Protection
Thermal Overload Protection
Soft Start
8-pin WL-CSP
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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
V
IN
2.7V to 5.5V
PVIN
VDD
V
OUT
1.3V to 3.16V
10 µF
3.3 µH
EN
SW
AS1332
FB
4.7 µF
V
OUT
= 2.5 x V
CON
V
CON
0.52V to 1.27V
VCON
PGND
AGND
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