参数资料
| 型号： | MIC2142BM5 TR |
| 厂商： | Micrel Inc |
| 文件页数： | 8/17页 |
| 文件大小： | 0K |
| 描述： | IC REG BOOST FLYBK SEPIC SOT23-5 |
| 标准包装： | 3,000 |
| 类型： | 升压（升压），回扫，Sepic |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 3 V ~ 22 V |
| 输入电压： | 2.2 V ~ 16 V |
| 频率 - 开关： | 330kHz |
| 电流 - 输出： | 200mA |
| 同步整流器： | 无 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | SC-74A，SOT-753 |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | SOT-23-5 |
| 其它名称： | MIC2142BM5TR |
Micrel, Inc.
MIC2142
t ON(min) =
D nom 0.55
L max =
×
? V IN(min)
Diode
MBR0530
75°C
V FWD
at
100mA
0.275V
25°C
V FWD
at
100mA
0.325V
Room
Temp.
Leakage
at 15V
2.5μA
75°C
Leakage
at 15V
90μA
Package
SOD123
SMT
=
f max 360kHz
V IN(min) 2 × t ON(min) 2
I O(max) × 2 × T S(min)
= 1 . 53 μ sec
1
V O
η
0.95V
0.45V
0.56V
0.4μA
L max =
2.5 2 × 1.53 μ sec 2
1.1 × D nom 1.1 × 0.55
= 42 μ H
1N4148
BAT54
BAT85
0.6V 25nA
(175°C) (20V)
0.4V 10nA
(85°C) (25V)
0.54V
(85°C)
Table 2. Diode Examples
0.2μA
(20V)
1μA
(20V)
2μA
(85°C)
leaded
and SMT
SMT
DO-34
leaded
5mA × 2 × 2.78 μ sec 12
Select 39μH ±10%.
t ON(max) = =
F min 300kHz
×
0.8
1
? 2.5
= 2 μ sec
Output Capacitor
Due to the limited availability of tantalum capacitors,
ceramic capacitors and inexpensive electrolyics may be
I peak =
t ON(max) × V IN(max)
L min
=
2.0 μ sec × 4.7V
35 μ H
= 270mA
preferred. Selection of the capacitor value will depend
upon the peak inductor current and inductor size.
Bootstrap Con ? guration
MuRata offers the GRM series with up to 10μF @ 25V
For input voltages below
4.5V the bootstrap
with a Y5V temperature coefficient in a 1210 surface
mount package. Low cost applications can use the M-
series leaded electrolytic capacitor from Panasonic. In
general, ceramic, electrolytic, or tantalum values ranging
from 1μF to 22μF can be used for the output capacitor.
con ? guration can increase the output power capability of
the MIC2142. Figure 2 shows the bootstrap con ? guration
where the output voltage is used to bias the MIC2142.
This improves the power capability of the MIC2142 by
increasing the gate drive volt-age hence the peak
current capability of the internal switch. This allows the
Manufacturer
MuRata
Vishay
Panasonic
Series
GRM
594
M-series
Type
ceramic Y5V
tantalum
Electrolytic
Package
surface mount
surface mount
leaded
use of a smaller inductor which increases the output
power capability. Table 4 also summarizes the various
con ? gurations and power capabilities using the
booststrap con ? guration. This bootstrap con ? guration is
limited to output voltage of 16V or less.
Table 3. Capacitor Examples
Design Example
Given a design requirement of 12V output and 1mA load
Figure 1 shows how a resistor (R3) can be added to
reduce the ripple seen at the V CC pin when in the
bootstrap con ? guration. Reducing the ripple at the V CC
pin can improve output ripple in some applications.
with a minimum 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 Equation 3 or the graph in Figure
13.
+3.0V to +4.2V
V IN
L1
33μH
CR1
MBR0530
R3
100
R2
36.5k
+5V @80mA
C3
270pF
V OUT = 12V
I OUT = 5mA
V IN = 2.5V to 4.7V
C2
10μF
U1 MIC2142
4 FB SW 3
R1
12.4k
T S(min) =
=
F max = 360kHz
η = 0.8 = efficiency
D nom = 0.55
1 1
F max 360kHz
= 2.78 μ sec
GND
5
GND
EN VCC
2
1
C4
1F
C1
22μF
GND
Figure 1. Bootstrap V CC with V CC Low Pass Filter
October 2007
8
M9999-102507
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相关代理商/技术参数 |
参数描述 |
|---|---|
| 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/直流开关转换器 Micropower SOT23-5 Boost Converter (Lead Free) RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
| MIC2142YM5TR | 制造商:Micrel 功能描述:Converter DC-DC Single Boost 2.2 to 16V |
| MIC2142YM5-TR | 功能描述:Boost, Flyback, SEPIC Switching Regulator IC Positive Adjustable 2.2V 1 Output 200mA SC-74A, SOT-753 制造商:microchip technology 系列:- 包装:剪切带（CT） 零件状态:过期 功能:升压，升压/降压 输出配置:正 拓扑:升压，反激式，SEPIC 输出类型:可调式 输出数:1 电压 - 输入（最小值）:2.2V 电压 - 输入（最大值）:16V 电压 - 输出（最小值/固定）:2.2V 电压 - 输出（最大值）:22V 电流 - 输出:200mA 频率 - 开关:330kHz 同步整流器:无 工作温度:-40°C ~ 85°C（TA） 安装类型:表面贴装 封装/外壳:SC-74A，SOT-753 供应商器件封装:SOT-23-5 标准包装:1 |
| MIC2145 | 制造商:MICREL 制造商全称:Micrel Semiconductor 功能描述:High Efficiency 2.5W Boost Converter |
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