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參數(shù)資料
| 型號： | ML4871 |
| 廠商： | Fairchild Semiconductor Corporation |
| 英文描述： | High Current Boost Regulator(大電流升壓穩(wěn)壓器) |
| 中文描述： | 高電流升壓穩(wěn)壓器（大電流升壓穩(wěn)壓器） |
| 文件頁數(shù)： | 8/9頁 |
| 文件大小： | 237K |
| 代理商： | ML4871 |
8
ML4871
I
OUT(MAX)
(mA)
V
IN
(V)
1.8
2.0
2.2
2.4
2.6
2.8
3.0
3.2
3.4
3.6
3.8
4.0
4.2
4.4
4.6
4.8
V
OUT
= 3.3V
386.2
451.9
521.5
585.9
651.0
716.5
782.0
V
OUT
= 5.0V
286.2
332.1
379.1
430.0
479.0
525.4
571.8
618.5
665.0
711.7
758.7
805.3
851.9
899.0
946.1
992.7
I
OUT
(mA)
EFFICIENCY PERCENTAGE
V
IN
= 2.4V, V
OUT
= 3.3V
1.0
2.0
5.0
10.0
20.0
50.0
100.0
200.0
586.0
V
IN
= 2.4V, V
OUT
= 5.0V
1.0
2.0
5.0
10.0
20.0
50.0
100.0
200.0
485.0
82.0
84.4
87.0
87.6
87.9
88.3
88.6
88.2
65.1
84.4
87.0
87.7
88.4
88.9
89.1
88.9
87.5
71.6
Table 1. Typical I
OUT
and Efficiency vs. V
IN
DESIGN EXAMPLE
In order to design a boost converter using the ML4871, it
is necessary to define a few parameters. For this example,
assume that V
IN
= 3.0V to 3.6V, V
OUT
= 5.0V, and
I
OUT(MAX)
= 500mA.
First, it must be determined whether the ML4871 is
capable of delivering the output current. This is done using
Equation 1:
I
V
V
A
A
OUT MAX
(
)
.
.
.
.
.
=
=
125
30
50
07
053
Next, select an inductor. As previously mentioned, the
recommended inductance is 10μH. Make sure that the
peak current rating of the inductor is at least 1.5A, and
that the DC resistance of the inductor is in the range of 50
to 100m
W
.
Finally, the value of the output capacitor is determined
using Equation 2:
C
H
V
F
OUT
=
50
.
=
44 10
88
m
m
The closest standard value would be a 100μF capacitor
with an ESR rating of 100m
W
. If such a low ESR value
cannot be found, two 47μF capacitors in parallel could
also be used.
Figure 9. Typical Application Circuit
ML4871
VOUT
100μF
100μF
VIN
10μH
(Sumida CD75)
VL1
VIN
GND
DETECT
PWR GND
RESET
VL2
VOUT
The complete circuit is shown in Figure 9. As mentioned
previously, the use of an input supply bypass capacitor is
highly recommended.
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相關(guān)代理商/技術(shù)參數(shù) |
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|---|---|
| ML4871CS3 | 制造商:Rochester Electronics LLC 功能描述:- Bulk 制造商:Fairchild Semiconductor Corporation 功能描述: |
| ML4871CS-3 | 制造商:MICRO-LINEAR 制造商全稱:MICRO-LINEAR 功能描述:High Current Boost Regulator |
| ML4871CS-5 | 制造商:MICRO-LINEAR 制造商全稱:MICRO-LINEAR 功能描述:High Current Boost Regulator |
| ML4871ES-3 | 制造商:MICRO-LINEAR 制造商全稱:MICRO-LINEAR 功能描述:High Current Boost Regulator |
| ML4871ES5 | 制造商:Fairchild Semiconductor Corporation 功能描述: |
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