ꢀ ꢁꢂꢃ ꢄ ꢅ ꢄ ꢄ ꢆ ꢀꢁ ꢂ ꢃꢄ ꢅꢄ ꢇ
ꢀ ꢁꢂꢃ ꢄ ꢅ ꢄ ꢈ ꢆ ꢀꢁ ꢂ ꢃꢄ ꢅꢄ ꢉ
SLVS391B − OCTOBER 2001 − REVISED FEBRUARY 2002
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.
L1
10 µH
C
i
10 µF
7
SW
5
V
= 3.3 V
≥ 100 mA
6
9
O
VOUT
LBO
VBAT
LBI
I
O
C
22 µF
o
R1
R5
R3
10
Low Battery
Output
R2
TPS61010
FB
1
8
EN
Single or dual
NiCd,
R4
R
(C)
2
NiMH or
ADEN
COMP
Alkaline Cell
GND
9
C
100 kΩ
C
c2
10 nF
c1
10 pF
C1F
1 µF
C2F
1 µF
8
6
3
4
C1F− C1F+ C2F− C2F+
7
OUT
V
I
= 1.5 V
≤ 150 mA
O
O
5
1
C
o
10 µF
VIN
C
2.2 µF
i
TPS60503
FB
10
R
EN
OFF/ON
2
Power Good
Output
PG
GND
9
Figure 30. Internet Audio Power Supply
17
www.ti.com
TI [ TEXAS INSTRUMENTS ]
