FAN5902 Fairchild Semiconductor, FAN5902 Datasheet - Page 2

• Manufacturer Part Number: FAN5902
• Description: The FAN5902 is a high-efficiency, low-noise, synchronous, step-down DC-to-DC converter designed for powering the radio frequency power amplifiers (RFPA) in 3G mobile handsets and other mobile applications
• Manufacturer: Fairchild Semiconductor

© 2009 Fairchild Semiconductor Corporation
FAN5902 • Rev. 1.0.2.short
Application Diagrams
2.7V up to 5.5V
2.7V to
V
V
BATT
5.5V
BAT
10 F
0603
10μF
G
P
O
From External DAC
I
3
Process or
From Processor
Base
VCON
SY NC
BPE N
D
A
C
AV IN
PV IN
PV IN
EN
Figure 2.
PVIN
BPE N
SYNC
PVIN
AVIN
EN
VCON
Figure 1.
R
FIN
Controller
DCDC
Reference
Bandgap
FAN5902
Typical Application
P
50m
FAN5902 Circuit
DET
Bypass Slew
Controller
2
Switcher
V
MO D E
VOUTSNS
VOUTSNS
Bias
Detector
PGND
Power
AGND
SW
V
V
PGND
AGND
SW
R FPA
OUT_SNS
OUT_SNS
Supply
470nH
R
FO U T
20mA < I
0.4V < V
470nH
2.2 F
0603
V
OUT
OUT
OUT
< 800mA
Duplexer
< V
0.4V up to V
Up to 800mA
Dynamic
RX
Scaling
V
BAT
2.2μF
OUT
V
OUT
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IN