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参数资料
| 型号： | MIC2571-1BMM TR |
| 厂商： | Micrel Inc |
| 文件页数： | 8/12页 |
| 文件大小： | 0K |
| 描述： | IC REG BOOST 2.85V/3.3V/5V 8MSOP |
| 标准包装： | 2,500 |
| 类型： | 升压（升压） |
| 输出类型： | 固定 |
| 输出数： | 1 |
| 输出电压： | 2.85V，3.3V，5V |
| 输入电压： | 0.9 V ~ 15 V |
| 频率 - 开关： | 20kHz |
| 电流 - 输出： | 1A |
| 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： | 8-TSSOP，8-MSOP（0.118"，3.00mm 宽） |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 8-MSOP |
| 其它名称： | MIC2571-1BMMTR MIC2571-1BMMTR-ND |
MIC2571
When the output switch turns off, the voltage across the
inductor changes sign and flies high in an attempt to maintain
a constant current. The inductor voltage will eventually be
Micrel
Referring to Figure 1, it can be seen the peak input current will
be twice the average input current. Rearranging the inductor
equation to solve for L:
clamped to a diode drop above V OUT . Therefore, when the
output switch is off, the voltage across the inductor is:
L =
V
I
× t 1
V 2 = V OUT DIODE – V IN
+ V
For normal operation the inductor current is a triangular
waveform which returns to zero current (discontinuous mode)
L =
V IN(min)
2 × Average I IN(max)
× t 1
at each cycle. At the threshold between continuous and
discontinuous operation we can use the fact that I 1 = I 2 to get:
V 1 × t 1 = V 2 × t 2
where t 1 =
duty cycle
f OSC
V 1
V 2
=
t 2
t 1
To illustrate the use of these equations a design example will
be given:
Assume:
This relationship is useful for finding the desired oscillator
MIC2571-1 (fixed oscillator)
1.0V × 0.75
1.0V × 0.7
2 × 33.3mA × 20kHz
duty cycle based on input and output voltages. Since input
voltages typically vary widely over the life of the battery, care
must be taken to consider the worst case voltage for each
parameter. For example, the worst case for t 1 is when V IN is
at its minimum value and the worst case for t 2 is when V IN is
at its maximum value (assuming that V OUT , V DIODE and V SAT
do not change much).
To select an inductor for a particular application, the worst
case input and output conditions must be determined. Based
on the worst case output current we can estimate efficiency
V OUT = 5V
I OUT(max) =5mA
V IN(min) = 1.0V
efficiency = 75%.
Average I IN(max) =
L =
5V × 5mA
= 33.3mA
and therefore the required input current. Remember that this
is power conversion, so the worst case average input current
will occur at maximum output current and minimum input
voltage.
L = 525 μ H
Use the next lowest standard value of inductor and verify that
it does not saturate at a current below about 75mA
(< 2 × 33.3mA).
Average I IN(max) =
V OUT × I OUT(max)
V IN(min) × Efficiency
MIC2571
8
1997
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MIC2571-1YMM | 功能描述:直流/直流开关调节器 One Cell Boost Regulator (Lead Free) RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
| MIC2571-1YMM TR | 功能描述:直流/直流开关调节器 One Cell Boost Regulator (Lead Free) RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
| MIC2571-2BMM | 功能描述:IC REG BOOST ADJ 1A 8MSOP 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 |
| MIC2571-2BMM TR | 功能描述:IC REG BOOST ADJ 1A 8MSOP 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 |
| MIC2571-2YMM | 功能描述:直流/直流开关调节器 One Cell Boost Regulator (Lead Free) RoHS:否 制造商:International Rectifier 最大输入电压:21 V 开关频率:1.5 MHz 输出电压:0.5 V to 0.86 V 输出电流:4 A 输出端数量: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:PQFN 4 x 5 |
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