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參數(shù)資料
| 型號： | AS1339-BWLT |
| 廠商： | AUSTRIAMICROSYSTEMS AG |
| 元件分類： | DC/DC變換器 |
| 英文描述： | 650mA Buck+2x10mA LDOs RF-PA; Package Type: CS-WLP-16 |
| 封裝： | CS-WLP-16 |
| 文件頁數(shù)： | 18/25頁 |
| 文件大小： | 4057K |
| 代理商： | AS1339-BWLT |
wwwaustriamcrosystems.com/DC-DC_Step-Down/AS1339
Revision 1.05
18 - 25
AS1339
Datasheet - Application Information
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
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
Part Number
GRM21BR60J106KE01
GRM21BR61C475KA88
C
Voltage
6.3V
16V
Type
X5R
X5R
Size
0805
0805
Manufacturer
www.murata.comC
IN1
, C
OUT
10μF
4.7μF
C0603C475K8PAC7867
4.7μF
10V
X5R
0603
KEMET
www.kemet.com
BIAS
IN
PA1
BIAS
IN
PA2
BASEBAND
PROCESSOR
GPIO
GPIO
GPIO
DAC
+
PA_EN
EN1
EN2
TEST
Not
IN2
REFIN
IN1B
IN1A
Li+ Battery
LDO2
LDO1
AGND
NC
PGND
LX
PAB
PAA
2.2μH
C
OUT
C
LDO1
Connected
C
LDO2
RF
IN
RF
OUT
RF
IN
RF
OUT
C
I
C
IN2
AS1339
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