Datasheet

 
 
SLVS391B − OCTOBER 2001 − REVISED FEBRUARY 2002
17
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APPLICATION INFORMATION
internet audio power supply
The input voltage from a single or dual NiCd, NiMH or alkaline cell is boosted to 3.3 V. This voltage is used as
system supply for the application and as an input voltage for the step-down charge pump which is used to
provide the core voltage for a DSP.
C1F
1 µF
86
C1F− C1F+
C2F
1 µF
34
C2F− C2F+
7
OUT
10
FB
C
o
10 µF
R5
V
O
= 3.3 V
I
O
≥ 100 mA
2
PG
R
5
VIN
1
EN
GND
9
OFF/ON
C
i
2.2 µF
TPS60503
SW
7
5
VOUT
10
LBO
C
o
22 µF
2
COMP
6
VBAT
1
EN
GND
9
C
i
10 µF
TPS61010
FB
R1
R2
9
8
100 kΩ
R
(C)
C
c1
10 pF
C
c2
10 nF
R3
R4
Low Battery
Output
Power Good
Output
V
O
= 1.5 V
I
O
≤ 150 mA
Single or dual
NiCd,
NiMH or
Alkaline Cell
LBI
ADEN
L1
10 µH
Figure 30. Internet Audio Power Supply