参数资料
| 型号： | MIC2141BM5 TR |
| 厂商： | Micrel Inc |
| 文件页数： | 8/16页 |
| 文件大小： | 0K |
| 描述： | IC REG BOOST ADJ 10MA SOT23-5 |
| 标准包装： | 3,000 |
| 类型： | 升压（升压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 4.8 V ~ 22 V |
| 输入电压： | 2.5 V ~ 14 V |
| 频率 - 开关： | 330kHz |
| 电流 - 输出： | 10mA |
| 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： | MIC2141BM5TR MIC2141BM5TR-ND |
Micrel, Inc.
MIC2141
As can be seen in the “Typical Characteristics:
Efficiency” graph, the output diode type can have an
effect on circuit efficiency. The BAT54- and BAT85-
I PEAK =
t ON(max) ? V IN(max)
L MIN
= 0.767μs
4.8V
13.5μH
series diodes are low-current Shottky diodes available
from On Semiconductor and Phillips, respectively. They
are suitable for peak repetitive currents of 300mA or less
with good reverse current characteristics. For applica-
tions that are cost driven, the 1N4148, or equivalent, will
provide sufficient switching speed with greater forward
drop and reduced cost. Other acceptable diodes are On
Semiconductor’s MBR0530 or Vishay’s B0530, although
they can have reverse currents that exceed 1mA at very
high junction temperatures. Table 3 summarizes some
typical performance characteristics of various suitable
diodes.
Output Capacitor
If the availability of tantalum capacitors is limited,
ceramic capacitors and inexpensive electrolyics may be
necessary. Selection of the capacitor value will depend
upon on the peak inductor current and inductor size.
MuRata offers the GRM series with up to 10μF at 25V,
with a Y5V temperature coefficient, in a 1210 surface-
mount package. Low-cost applications can use M-series
leaded electrolytic capacitors from Panasonic. In
I PEAK = 272mA
Select a BAT54 diode and CR32 inductor.
Always check the peak current to insure that it is within
the limits specified in the load line shown in Figure 10 for
all input and output voltages.
Gain Boost
Use Figure 2 to increase the voltage gain of the system.
The typical gain can easily be increased from the
nominal gain of 6 to a value of 8 or 10. Figure 2 shows a
gain of 8 so that with 2.5V applied to V C , V OUT will be
20V.
Bootstrap
The bootstrap configuration is used to increase the
maximum output current for a given input voltage. This is
most effective when the input voltage is less than 5V.
Output current can typically be tripled by using this
technique. See Table 4a. for bootstrap-ready-built
component values.
general, ceramic, electrolytic, or tantalum values ranging
from 10μF to 47μF can be used for the output capacitor.
V IN
+2.7V to +12V
L1
33μH
CR1
BAT54HT1
V OUT
+5V to +15V
Manufacturer
MuRata
Series
GRM
Type
ceramic Y5V
Package
surface mount
C2
10μF
25V
V C
C4
0.1μF
1
5
MIC2141
IN SW
FB
VC GND
3
4
2
C1
10μF
25V
Vishay
Panasonic
594
M-series
tantalum
Electrolytic
surface mount
leaded
Return
Figure 1. Basic Configuration
Return
Table 4. Capacitor Examples
Design Example
V IN
L1
22μH
CR1
BAT54HT1
V OUT
V OUT C 1 +
? + I FB - R1
C1 ? R1 ?
?
R2 ?
10μF
I FB(typ) = 15 m A for V OUT = 15V
Given a design requirement of 12V output and 1mA load
with a minimum input voltage of 2.5V, Equation 1 can be
used to calculate to maximum inductance or it can be
read from the graph in Figure 4. Once the maximum
+2.7V to +12V
C2
10μF
25V
V C
Return
C4
0.1μF
4
5
MIC2141
IN SW
FB
VC GND
3
2
1
R1
34.8k
I FB
R2
121k
+5V to +20V
= 6V
25V
Return
inductance has been determined, the peak current can
be determined using Equation 2 or Figure 9.
V OUT = 12V
Figure 2. Gain-Boost Configuration
I OUT = 1mA
V IN = 4.8V to 2.5V
V IN
+2.7V to +4.7V
L1
4.7μH
CR1
MBR0530
V OUT
+12V
V IN(min) ? t ON(min)
? V IN(min) ? 2 ? T S(min)
C4
L MAX =
I O(max)
V O
eff
2 2
V C
Return
CR2
1N4148 0.1μF
C2
10μF
25V
1
5
MIC2141
IN SW
FB
VC GND
3
4
2
CR3
1N4148
C1
10μF
25V
Return
L MAX = 17μH
Select 15μH ±10%.
Figure 3. Bootstrap Configuration
December 2006
8
M9999-122006
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相关代理商/技术参数 |
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| MIC2141YM5 | 制造商:MICREL 制造商全称:Micrel Semiconductor 功能描述:Micropower Boost Converter |
| MIC2141YM5 TR | 功能描述:直流/直流开关转换器 Micropower Boost Converter, Dynamically Adjustable (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 |
| MIC2141YM5-TR | 功能描述:Boost, Flyback, SEPIC Switching Regulator IC Positive Adjustable 4.8V 1 Output 10mA SC-74A, SOT-753 制造商:microchip technology 系列:- 包装:剪切带（CT） 零件状态:停产 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）:2.5V 电压 - 输入（最大值）:14V 电压 - 输出（最小值/固定）:4.8V 电压 - 输出（最大值）:22V 电流 - 输出:10mA 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 |
| MIC2142 | 制造商:MICREL 制造商全称:Micrel Semiconductor 功能描述:Micropower Boost Converter |
| MIC2142_07 | 制造商:MICREL 制造商全称:Micrel Semiconductor 功能描述:Micropower Boost Converter |
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