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参数资料
| 型号： | FAN5903UCX |
| 厂商： | Fairchild Semiconductor |
| 文件页数： | 15/19页 |
| 文件大小： | 0K |
| 描述： | IC CONV BUCK W/BYPASS 9-WLCSP |
| 标准包装： | 3,000 |
| 应用： | 转换器，3G RF 功率放大器 |
| 输入电压： | 2.7 V ~ 5.5 V |
| 输出数： | 1 |
| 输出电压： | 0.4 V ~ 5.5 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 9-UFBGA，WLCSP |
| 供应商设备封装： | * |
| 包装： | 带卷 (TR) |
Application Information
Figure 39 illustrates an application of the FAN5903 in a 3G / 4G transmitter. The FAN5903 is designed for driving
multiple PAs. Figure 40 presents a timing diagram designed to meet WCDMA specifications. The FAN5903 supports
voltage transients less than 10 μs.
C IN
PVIN
FB
10μF
FAN5903
SW
540nH
L1
0.4V to V BAT
Up to 800mA DC
FSEL
BPEN
C OUT
V IN
From
DAC
EN
VCON
AGND
PGND
Power
Ground
Plane
4.7μF
Analog
Ground
Plane
V OUT
PA
1000pF
100pF
RF
Ground
Plane
PA
1000pF
100pF
RF
Ground
Plane
PA
1000pF
100pF
RF
Ground
Plane
Figure 39. Typical Application Diagram of FAN5903 Supplying Power to Three 3G or 4G PAs
30μs
DC-DC_EN
VCON
8μs
8μs
DC - DC V OUT
PA Supply
10ms
10ms
2.5 x V CON
RF Power
Figure 40. Timing Diagram for 3G/4G Transmitters
? 2008 Fairchild Semiconductor Corporation
FAN5903 ? Rev. 1.0.9
15
www.fairchildsemi.com
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