参数资料
| 型号： | MIC2145BMM TR |
| 厂商： | Micrel Inc |
| 文件页数： | 7/15页 |
| 文件大小： | 0K |
| 描述： | IC REG BST FLYBK SEPIC ADJ 8MSOP |
| 标准包装： | 2,500 |
| 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 ~ 16 V |
| 输入电压： | 2.4 V ~ 16 V |
| 频率 - 开关： | 450kHz |
| 电流 - 输出： | 500mA |
| 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： | MIC2145BMMTR MIC2145BMMTR-ND |
MIC2145
Functional Description
See “Application Information” for component selection and
pre-designed circuits.
Overview
The MIC2145 is a 2.5W boost regulator with programmable
peak current limit and a constant off time. Quiescent current
for the MIC2145 is typically 200 μ A when the switch is in the
off state. Efficiencies above 80% throughout most operating
conditions can be realized.
Regulation
Regulation is achieved by both of the comparators, which
regulate the inductor current and the output voltage by gating
the power MOSFET. Initially, power is applied to the SW and
VDD pins. When the part is enabled, the power MOSFET
turns on and current flows. When the current exceeds the
peak current limit threshold, the current limit comparator fires
the one-shot to turn off the power MOSFET for 1000ns and
Micrel, Inc.
Output
The maximum output voltage is limited by the voltage capa-
bility of the output switch. Output voltages of up to 16V can be
achieved with the boost circuit. Higher output voltages re-
quire a flyback configuration.
Peak Current Limit
The peak current limit is externally set with a resistor. The
peak current range is from 420mA to 2A. There is a minimum
resistor value for R SET at lower V DD voltages. For resistor
value selections, see the “Typical Characteristics: Peak
Current Limit vs. R SET ” .
Soft Start
The MIC2145 has a built in soft start that controls the rise time
of the output voltage and the peak current limit threshold
during start up.
resets the SR flip-fop. The current limit comparator continues
to cycle the power MOSFET on and off until the output voltage
trips the upper threshold of the feedback comparator, which
terminates the cycle. The cycle will begin again when the
output voltage drops below the lower hysteresis threshold of
the feedback comparator. The feedback comparator has a
typical hysteresis of 18mV. Due to the gain of the feedback
resistor divider, the voltage at V OUT experiences a typical
167mV of hysteresis for 10V output at 2.4V V DD . This can be
reduced by adding a feed-forward capacitor, C FF (See
“Output Voltage” section).
V EN
(2V/div)
V OUT
(5V/div)
V SW
(5V/div)
I INDUCTOR
(500mA/div)
Time 200 μ s
V IN = 3V
V OUT = 10V
R SET = 10k
C SS = 0.01 μ F
Figure 3. Typical Soft Start Waveforms
Thermal Shutdown
V OUT
AC Couple
(100mV/div)
Built-in thermal protection circuitry turns off the power MOSFET
when the junction temperature exceeds about 150 ° C.
V SW
(5V/div)
I INDUCTOR
(500mA/div)
Time 20 μ s
Figure 2. Typical Regulator Waveforms
April 2005
7
M9999-042205
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相关代理商/技术参数 |
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| MIC2145YML | 功能描述:直流/直流开关调节器 MSOP-8 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 |
| MIC2145YML TR | 功能描述:直流/直流开关调节器 MSOP-8 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 |
| MIC2145YML-TR | 功能描述:Boost, Flyback, SEPIC Switching Regulator IC Positive Adjustable 2.4V 1 Output 500mA 10-VFDFN Exposed Pad, 10-MLF? 制造商:microchip technology 系列:- 包装:剪切带（CT） 零件状态:有效 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）:2.4V 电压 - 输入（最大值）:16V 电压 - 输出（最小值/固定）:2.4V 电压 - 输出（最大值）:16V 电流 - 输出:500mA 频率 - 开关:450kHz 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:10-VFDFN 裸露焊盘，10-MLF? 供应商器件封装:10-MLF?（3x3） 标准包装:1 |
| MIC2145YMM | 功能描述:直流/直流开关调节器 MSOP-8 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 |
| MIC2145YMM TR | 功能描述:直流/直流开关调节器 MSOP-8 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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