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參數(shù)資料
| 型號： | AN32502A |
| 英文描述： | For Information·Communication - PDA |
| 中文描述： | 信息·通訊-掌上電腦 |
| 文件頁數(shù)： | 32/45頁 |
| 文件大小： | 574K |
| 代理商： | AN32502A |
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32
SDF00034AEB
AN32502A
Publication data: November 2002
2.8 V
LDO
3.2 V
Buck
converter
Ch.1
0.5 V to
1.7 V
Li-IOn
Battery or AC adapter
3.0 V to 5.8 V
7 bit
DAC
Control
Logic
Protection
circuit
3.3 V
LDO
Ch.2
3.2 V
200 mA
Ch.3
3.2 V
200 mA
Ch.4
3.2 V
500mA
Ch.5
2.8 V
200 mA
0.85 V to 1.8 V
Buck converter
Backup battery
charging circuit
3.2 V
LDO
3.2 V
Boost
Backup
3.2 V
2 mA
General
purpose
outputs
Analogswitch
Coin battery
Figure 3
1
300 mA
Application Notes (continued)
3
.
System block diagram
The block diagram for this IC is shown on figure 3
1.
Output-stage MOSFETs for ch.1 to ch.5 are fit externally for its nature general purpose.
Output current for each channel is a typical value for an evaluation board.
Therefore, select an external MOSFET to meet the conditions needed in the application.
Output voltages for ch.2 to ch.5 are available in the range of 1.5 V and more with constant setting of external feedback circuit.
(R1
+
R2)
R2
Vo
=
V
REF
×
4
.
Output voltage setting
Output voltage of each channel is determined by the following equation.
V
REF
is an internal reference voltage and differs from every each channel differs values. Refer to table 4
1.
Ch.1 reference voltage can be controlled by DAC. 1.08 V is an initial setting value (DAC data ‘1010100’).
A reference voltage can be set with 8.36 mV/ step in the range of 0.38 V to 1.45 V.
Output voltage change is multiplied by (R1+R2)/R2. For example, when output is set to 1.3 V, the output is able to adjusted
by the step of about 10 mV.
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