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參數(shù)資料
| 型號： | MIC2142BM5 |
| 廠商： | MICREL INC |
| 元件分類： | 穩(wěn)壓器 |
| 英文描述： | Micropower Boost Converter |
| 中文描述： | SWITCHING REGULATOR, 365 kHz SWITCHING FREQ-MAX, PDSO5 |
| 封裝： | SOT-23, 5 PIN |
| 文件頁數(shù)： | 8/17頁 |
| 文件大?。?/td> | 137K |
| 代理商： | MIC2142BM5 |
MIC2142
Micrel
MIC2142
8
December 2000
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Table 3. Capacitor Examples
Design Example
Given a design requirement of 12V output and 1mA load with
an miniumum input voltage of 2.5V, Equation 2 can be used
to calculate to maximum inductance or it can be read from the
graph in Figure 7. Once the maximum inductance has been
determined the peak current can be determined using Equa-
tion 3 or the graph in Figure 13.
V
OUT
= 12V
I
OUT
= 5mA
V
IN
= 2.5V to 4.7V
F
max
= 360kHz
η
= 0.8 = efficiency
D
nom
= 0.55
T
1
F
1
360kHz
0.55
360kHz1.53 sec
2.78 sec
t
D
f
L
V
I
O(max)
t
×
2
T
1
V
V
L
sec
μ
2 78
.
sec
μ
H
S(min)
max
nom
ON(min)
max
max
IN(min)
ON(min)
S(min)
O
η
IN(min)
max
2
=
=
=
=
=
=
×
×
×
=
×
×
×
×
=
μ
2
2
2
2 5
5
mA
1 53
2
1
12
0 8
.
2 5
.
42
.
.
Select 39
μ
H
±
10%.
t
1.1 D
F
1.1 0.55
300kHz
= μ
I
t
V
L
2.0 sec
4.7V
35 H
270mA
ON(max)
nom
min
×
peak
ON(max)
IN(max)
min
=
=
=
=
×
=
Bootstrap Configuration
For input voltages below 4.5V the bootstrap configuration can
increase the output power capability of the MIC2142. Figure
2 shows the bootstrap configuration where the output voltage
is used to bias the MIC2142. This impoves the power capa-
bility of the MIC2142 by increasing the gate drive voltage
hence the peak current capability of the internal switch. This
allows the use of a smaller inductor which increases the
output power capability. Table 4 also summarizes the various
configurations and power capabilities using the booststrap
configuration. This bootstrap configuration is limited to output
voltage of 16V or less.
Figure 1 shows how a resistor (R3) can be added to reduce
the ripple seen at the V
CC
pin when in the bootstrap configu-
ration. Reducing the ripple at the V
CC
pin can improve output
ripple in some applications.
R2
36.5k
R1
12.4k
C1
22
μ
F
+5V @80mA
GND
GND
+3.0V to +4.2V
V
IN
L1
33
μ
H
CR1
MBR0530
U1
MIC2142
4
FB
5
3
2
1
SW
GND
VCC
EN
C2
10
μ
F
C3
270pF
C4
1
μ
F
R3
100
Figure 1. Bootstrap V
CC
with V
CC
Low Pass Filter
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MIC2142BM5 EV | 制造商:Micrel Inc 功能描述: |
| MIC2142BM5 TR | 功能描述:IC REG BOOST FLYBK SEPIC SOT23-5 RoHS:否 類別:集成電路 (IC) >> PMIC - 穩(wěn)壓器 - DC DC 開關(guān)穩(wěn)壓器 系列:- 標準包裝:20 系列:SIMPLE SWITCHER® 類型:降壓（降壓） 輸出類型:固定 輸出數(shù):1 輸出電壓:12V 輸入電壓:4 V ~ 60 V PWM 型:電壓模式 頻率 - 開關(guān):52kHz 電流 - 輸出:1A 同步整流器:無 工作溫度:-40°C ~ 125°C 安裝類型:通孔 封裝/外殼:16-DIP（0.300"，7.62mm） 包裝:管件 供應(yīng)商設(shè)備封裝:16-DIP 其它名稱:*LM2575HVN-12LM2575HVN-12 |
| MIC2142BM5TR | 制造商:Rochester Electronics LLC 功能描述:- Tape and Reel |
| MIC2142YM5 | 制造商:Rochester Electronics LLC 功能描述: 制造商:Micrel Inc 功能描述: 制造商:RF Micro Devices Inc 功能描述: |
| MIC2142YM5 TR | 功能描述:直流/直流開關(guān)轉(zhuǎn)換器 Micropower SOT23-5 Boost Converter (Lead Free) RoHS:否 制造商:STMicroelectronics 最大輸入電壓:4.5 V 開關(guān)頻率:1.5 MHz 輸出電壓:4.6 V 輸出電流:250 mA 輸出端數(shù)量:2 最大工作溫度:+ 85 C 安裝風格:SMD/SMT |
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