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AS1339
Datasheet - A p p l i c a t i o n I n f o r m a t i o n
9 Application Information
The AS1339 is designed to supply power amplifiers for RF applications. The output power of the PA can directly be
controlled via the output voltage of the AS1339. Figure 50 shows a typical application.
Figure 50. Typical Application Diagram
Li+ Battery
+
IN1A
LX
2.2μH
IN1B
PAB
PAA
C OUT
DAC
BASEBAND
REFIN
PGND
LDO1
PROCESSOR
GPIO
GPIO
GPIO
PA_EN
EN1
EN2
TEST
AS1339
LDO2
C LDO1
RF IN
BIAS
PA1
IN
RF OUT
Not
Connected
C LDO2
IN2
NC
BIAS
C IN2
AGND
RF IN
IN
RF OUT
PA2
Capacitor Selection for Step-Down Converter
Input Capacitor
To reduce the current peaks drawn from the battery or power source and to reduce the switching noise in the device an
input capacitor is highly recommended. At the switching frequency the impedance of the capacitor should be very low.
It’s recommended to use a X5R or X7R dielectric multilayer ceramic capacitor due to their small size, low ESR and
small temperature coefficients. For most applications a 4.7μF capacitor is sufficient. To decrease the interfering noise
and to lower the input ripple the capacitor value can be set higher (e.g. 10μF).
Output Capacitor
To ensure a stable loop regulation and a small output voltage ripple a low impedance capacitor should be used. It’s
recommended to use a X5R or X7R dielectric multilayer ceramic capacitor due to their small size, low ESR and small
temperature coefficients. For most applications a 4.7μF capacitor is sufficient. To achieve a better load-transient perfor-
mance and to decrease the output ripple the capacitor value can be set higher (e.g. 10μF).
Table 6. Recommended Capacitors for the Step-Down Converter
Name
C IN1 , C OUT
Part Number
GRM21BR60J106KE01
GRM21BR61C475KA88
C0603C475K8PAC7867
C
10μF
4.7μF
4.7μF
Voltage
6.3V
16V
10V
Type
X5R
X5R
X5R
Size
0805
0805
0603
Manufacturer
Murata
KEMET
Revision 1.05
18 - 25
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