Philips BT2500B/W-00 - Block Diagram

3-1
BLOCK DIAGRAM
Block Diagram
Power
Sig
nal
AMPLIFLER
B
luetooth
A
U
DI
O
IN
hi
g
h
PA
SS
f
ilt
e
r
4558
Li batteries
3.7V/750mA
STEP-UP
ME2149
7533_3.3V
LDO
KEY
REGULATOR
SW
I
T
C
H
IN
G
FW
37
17
SPEAKER
4 ohm 4W
charging LED
VR
Da
ta
TD
A
74
91
low power LED
SL
I
DE
S
W
I
T
C
H
charging
AT6009
Aud
i
oL
i
mit
e
r
D2761
USB
KA
KA
BLUETOOTH_LED