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參數(shù)資料
| 型號： | APPHINT30 |
| 英文描述： | MIC2527 Voltage Drop. Packaging. and PCB Layout |
| 中文描述： | MIC2527壓降。包裝。和PCB布局 |
| 文件頁數(shù)： | 2/2頁 |
| 文件大?。?/td> | 43K |
| 代理商： | APPHINT30 |
Application Hint 30
Micrel
Application Hint 30
2
September 1999
Heat Sink Requirements
To determine regulator heat sink requirements, calculate the
regulator power dissipation at the applicable input voltage:
P
D
= I
OUT
(1.02
×
V
IN
– V
OUT
)
where:
V
IN
< 7.0V
At V
IN
= 7V:
P
D(max)
= 2.1A (1.02
×
7V – 5.1V)
P
D(max)
= 4.3W
Using the same formula for V
IN
= 5.4V, the minimum input
voltage, P
D(max)
is 0.86W. For further information, see the
MIC29311 data sheet.
If the average V
IN
is greater than 7V, a 3A stepdown switching
regulator, such as the MIC4576, may replace the linear
regulator, with reduced heat sink requirements.
Packaging and Board Layout
The MIC2527 is offered in the 16-pin plastic DIP package for
through-hole mounting and in the 16-pin 0.300-inch wide
SOIC package for surface mounting. Micrel plans to add a
third package option with the 16-pin 0.150-inch narrow SOIC
package.
For customers who would like to migrate from the 0.300-inch
to the 0.150-inch SOIC package, it is possible to layout the
PCB to take either package by using longer traces to the
package leads.
Figure 2 shows the nominal trace dimensions needed for a
dual 0.150-inch/0.300-inch SOIC layout.
0.030 MAX.
PAD WIDTH
0.025 MIN.
TRACE WIDTH
0.050 (BASIC)
PAD CENTERS
0.020 MIN.
BETWEEN
PADS
Narrow SO-16 (M)
Wide SO-16 (WM)
0.450
0.375
0.250
0.200
0.050
DIMENSIONS:
INCHES
Figure 2. Dual-Package PCB Layout
MIC29311-5.1
LDO Regulator
IN
EN
OUT
ERR
GND
ON/OFF
OVERCURRENT
MIC2527
3.3V USB Controller
V
BUS
D+
D–
GND
V
BUS
D+
D–
GND
47k
MIC5207-3.3
LDO Regulator
IN
OUT
GND
33μF*
Ferrite
Bead
D+
D–
V+
ENA
FLGA
ENB
FLGB
ENC
FLGC
END
FLGD
IN
IN
OUTA
OUTB
OUTC
Bold
lines indicate
0.1" wide, 1-oz. copper
high-current traces.
Downstream
USB
Port 1
500mA max.
Downstream
USB
Port 2
500mA max.
33μF*
0.1
μF
V
BUS
D+
D–
GND
V
BUS
D+
D–
GND
33μF*
OUTD
GND
GND
Downstream
USB
Port 3
500mA max.
Downstream
USB
Port 4
500mA max.
33μF*
0.01μF
0.01μF
0.01μF
0.01μF
4.7
μF
1μF
GND
5.7V
* 33μF, 16V tantalum or 100μF, 10V electrolytic per port
10k
4.75V min.
at 500mA
5.1V
±
3%
Figure 1. MIC2527 Application
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