RTPA5250-130 データシートの表示（PDF） - Raytheon Company
部品番号
コンポーネント説明
メーカー
RTPA5250-130 Datasheet PDF : 13 Pages
| |||
Generation of
Negative Voltages
RTPA5250-130
3.3V UNII Band Power Amplifier
MMIC/Switch Module for WLAN
PRODUCT INFORMATION
For systems that do not have negative voltages available, this voltage may be generated using inexpensive off the
shelf components. Figure 7 shows a schematic using the Maxim Max868 regulated adjustable –2x inverting charge
pump.
A suggested layout is shown in Figure 8. The negative voltage is set by the ratio of R2 to R1. As shown, this results
in a voltage of –5.5 V derived from the 3.3V Vdd supply. This is the recommended operating point for the
RTPA5250-130 when used with the Maxim 868. The maximum current obtainable from the 868 is a direct function
of the positive supply voltage, in this case, 3.3V.
Figure 7
Typical Operating
Circuit
Vin - 1.8V to 5.5V
1µF
SHDN
IN
R2
0.1µF
0.1µF
C1+
FB
C1-
C2+
OUT
C2-
PGND GND
R1
Vout - 0V to -2x Vin
2.2µF
Figure 8
Typical Operating
Circuit
8
9
7
C3
6
C2
+
U1
10
R2
C4
+ C1
-
R1
www.raytheonrf.com
Characteristic performance data and specifications are subject to change without notice.
Revised January 25, 2002
Page 7
6
5
Raytheon RF Components
362 Lowell Street
Andover, MA 01810
Share Link: 