PRELIMINARY
CYW43903
Figure 4. Typical Power Topology (Page 2 of 2)
CYW43903 2.5V and 3.3V
450 to
800 mA
WLRF PA
3.3V
VBAT
LDO3P3
WLRF Pad
VDDIO_RF
WL OTP 3.3V
2.5V Cap-less
LNLDO
WL RF RX, TX, NMOS, Mini-PMU LDOs
2.5V Cap-less 2.5V
LNLDO
WL RF VCO
WL RF CP
2.5V Cap-less 2.5V
LNLDO
VCOLDO2P5
Inside WL Radio
Power
switch
Supply bump/pad
Ground bump/pad
External to chip
Supply ball
Ground ball
No power switch
No dedicated power switch, but internal power‐
down modes and block‐specific power switches
Document Number: 002-14826 Rev. *G
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