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| 型号： | MIC2141YM5 TR |
| 厂商： | Micrel Inc |
| 文件页数： | 7/16页 |
| 文件大小： | 0K |
| 描述： | IC REG BOOST ADJ 10MA SOT23-5 |
| 标准包装： | 1 |
| 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： | 标准包装 |
| 供应商设备封装： | SOT-23-5 |
| 产品目录页面： | 1091 (CN2011-ZH PDF) |
| 其它名称： | 576-2597-6 |
Micrel, Inc.
MIC2141
Application Information
Pre-designed circuit information is at the end of this
section.
Component Selection
Boost Inductor
Maximum power is delivered to the load when the
oscillator is gated on 100% of the time. Total output
power and circuit efficiency must be considered when
determining the maximum inductor. The largest inductor
possible is preferable in order to minimize the peak
V OUT
3.3V
5.0V
9.0V
12.0V
15.0V
16.0V
20.0V
22.0V
V IN(CCM)
3.04V
4.40V
7.60V
10.0V
12.4V
13.2V
16.4V
18.0V
current and output ripple. Efficiency can vary from 80%
Table 1. DCM/CCM Boundary
to 90% depending upon input voltage, output voltage,
load current, inductor, and output diode.
(3)
V IN(ccm) = (V OUT + V FWD ) + (1 – D)
Equation 1 solves for the output current capability for a
given inductor value and expected efficiency. Figures 5
through 9; graph estimates for maximum output current,
assuming the minimum duty cycle, maximum frequency,
Table 2 lists common inductors suitable for most applica-
tions. Table 6 lists minimum inductor sizes versus input
and output voltage. In low-cost, low-peak-current applic-
ations, RF-type leaded inductors may sufficient. All
and 85% efficiency. To determine
the required
inductors listed in Table 4 can be found within the
inductance, find the intersection between the output
voltage and current and select the value of the inductor
curve just above the intersection. If the efficiency is
selection of CR32- or LQH4C-series inductors from
either Sumida or muRata.
expected to be other than the 85% used for the graph,
Manufacturer
Series
Device Type
( V IN(min) t ON ) 2 1
? V IN(min)
Equation 1 can then be used to better determine the
maximum output capability.
(1) I O(max) = ×
2L MAX T S V O
eff
The peak inductor and switch current can be calculated
MuRata
Sumida
J.W. Miller
Coilcraft
LQH1C/C3/C4 surface mount
CR32 surface mount
78F axial leaded
90 axial leaded
Table 2. Inductor Examples
from Equation 2 or read from the graph in Figure 10. The
peak current shown in Figure 10 is derived assuming a
maximum duty cycle and a minimum frequency. The
selected inductor and diode peak current capability must
exceed this value. The peak current seen by the inductor
is calculated at the maximum input voltage. A wider input
voltage range will result in a higher worst-case peak
current in the inductor. This effect can be seen in Table
4 by comparing the difference between the peak current
at V IN(min) and V IN(max) .
Boost Output Diode
Speed, forward voltage, and reverse current are very
important in selecting the output diode. In the boost
configuration, the average diode current is the same as
the average load current. (The peak current is the same
as the peak inductor current and can be derived from
Equation 2 or Figure 10.) Care must be take to make
sure that the peak current is evaluated at the maximum
input voltage.
(2)
I PK =
t ON(max) V IN(max)
L MIN
Diode
75°C
V FWD
at
100mA
25°C
V FWD
at
100mA
Room
Temp.
Leakage
at 15V
75°C
Leakage
at 15V
Package
DCM/CCM Boundary
Equation 3 solves for the point at which the inductor
current will transition from DCM (discontinuous conduc-
tion mode) to CCM (continuous conduction mode). As
the input voltage is raised above this level the inductor
has a potential for developing a dc component while the
oscillator is gated on. Table 1 displays the input points at
which the inductor current can possibly operate in the
CCM region. Operation in this region can result in a peak
MBR0530
1N4148
BAT54
BAT85
0.275V
0.6V
(175°C)
0.4V
(85°C)
0.54V
(85°C)
0.325V
0.95V
0.45V
0.56V
2.5μA
25nA
(20V)
10nA
(25V)
0.4μA
90μA
0.2μA
(20V)
1μA
(20V)
2μA
(85°C)
SOD123
SMT
leaded
and SMT
SMT
DO-34
leaded
current slightly higher than displayed on Table 4.
Table 3. Diode Examples
December 2006
7
M9999-122006
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相关代理商/技术参数 |
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| 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 |
| MIC2142-5.0BM5 TR | 功能描述:IC REG BOOST FLYBK SEPIC SOT23-5 RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:20 系列:SIMPLE SWITCHER® 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:12V 输入电压:4 V ~ 60 V PWM 型:电压模式 频率 - 开关:52kHz 电流 - 输出:1A 同步整流器:无 工作温度:-40°C ~ 125°C 安装类型:通孔 封装/外壳:16-DIP（0.300"，7.62mm） 包装:管件 供应商设备封装:16-DIP 其它名称:*LM2575HVN-12LM2575HVN-12 |
| MIC2142BD5 TR | 功能描述:IC REG BOOST FLYBK SEPIC SOT23-5 RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:20 系列:SIMPLE SWITCHER® 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:12V 输入电压:4 V ~ 60 V PWM 型:电压模式 频率 - 开关:52kHz 电流 - 输出:1A 同步整流器:无 工作温度:-40°C ~ 125°C 安装类型:通孔 封装/外壳:16-DIP（0.300"，7.62mm） 包装:管件 供应商设备封装:16-DIP 其它名称:*LM2575HVN-12LM2575HVN-12 |
| MIC2142BM5 | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
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