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参数资料
| 型号： | APW7075OC-TRL |
| 厂商： | ANPEC ELECTRONICS CORP |
| 元件分类： | 稳压器 |
| 英文描述： | Step-Up Converter and LDO Combo |
| 中文描述： | SWITCHING REGULATOR, PDSO8 |
| 封装： | LEAD FREE, MO-153AA, TSSOP-8 |
| 文件页数： | 18/23页 |
| 文件大小： | 413K |
| 代理商： | APW7075OC-TRL |
Copyright
ANPEC Electronics Corp.
Rev. A.5 - Aug., 2005
APW 7075
www.anpec.com.tw
18
Function Description ( Cont.)
Boost Converter Input Capacitor Selection
At least a 10uF input capacitor is recommended to
stabilize the battery voltage and minimize the peak
current ripple from the battery.
LDO Input Capacitor Selection
The LDO input capacitor with larger values and lower
ESRs provide better PSRR and line transient response.
At least a 10uF capacitor is recommended.
Output Capacitor Selection
Layout Considerations
The correct PCB layout is important for all switching
converters. If the layout is not carefully done, the regu-
lator could show stability problems as well as EMI
problems. Figure. 5 illustrates the layout guidelines,
the bold lines indicate the high current paths; these
traces must be short and wide. The input capacitors,
output capacitors, and the inductor should be as close
to the IC as possible. Use a common ground plane for
power ground and a different one for control ground to
minimize the effects of ground noise. Connect these
ground planes at a node close to the GND pin of IC.
The feedback and LBI resistor dividers should be placed
as close to the IC as possible.
ESR)
V
F
C
V
V
I
Voripple
OUT
SW
OUT
BAT
×
OUT
×
×
OUT
+
=
(
recommended, a 1uF ceramic capacitor in parallel for
bypassing the noise is also recommended. The fol-
lowing equation calculates the output ripple.
The inductor’s DC resistance affects the efficiency;
larger resistance dissipates more power, it should be
as small as possible. It is important to choose the
inductor’s saturation current rating greater than the
peak current which the inductor will flow in the
application.
The output capacitor is used for supplying the output
during internal N-channel MOSFET turns on time.
Larger capacitance and lower ESR reduce the output
voltage ripple. The output voltage supplies the power
to the IC and so the output voltage ripple must be as
small as possible to provide better PSRR. In general,
a 100uF to 220uF low ESR Tantalum capacitor is
Inductor Selection (Cont.)
Figure 5. Recommended Layout Diagram
APW7075
1
2
3
4
VIN
FB
SHDN
LBI
LBO
OUT
LX
GND
8
7
6
5
VBAT
USB 5V
C2
100uF
C1
10uF
22UH
C3
10uF
C4
1uF
VOUT
相关PDF资料 |
PDF描述 |
|---|---|
| APW7075OC-TU | Step-Up Converter and LDO Combo |
| APW7075OC-TUL | Step-Up Converter and LDO Combo |
| APW7077AZBI-TUL | PWM Step-Up DC-DC Converter |
| APW7077RBI-TR | PWM Step-Up DC-DC Converter |
| APW7077RBI-TRL | PWM Step-Up DC-DC Converter |
相关代理商/技术参数 |
参数描述 |
|---|---|
| APW7075OC-TU | 制造商:ANPEC 制造商全称:Anpec Electronics Coropration 功能描述:Step-Up Converter and LDO Combo |
| APW7075OC-TUL | 制造商:ANPEC 制造商全称:Anpec Electronics Coropration 功能描述:Step-Up Converter and LDO Combo |
| APW7077 | 制造商:ANPEC 制造商全称:Anpec Electronics Coropration 功能描述:PWM Step-Up DC-DC Converter |
| APW7077ARBI-TR | 制造商:ANPEC 制造商全称:Anpec Electronics Coropration 功能描述:PWM Step-Up DC-DC Converter |
| APW7077ARBI-TRL | 制造商:ANPEC 制造商全称:Anpec Electronics Coropration 功能描述:PWM Step-Up DC-DC Converter |
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