参数资料
| 型号： | MIC2177BWM TR |
| 厂商： | Micrel Inc |
| 文件页数： | 10/15页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ 2.5A 20SOIC |
| 标准包装： | 1,000 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 1.25 V ~ 16.5 V |
| 输入电压： | 4.5 V ~ 16.5 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 200kHz |
| 电流 - 输出： | 2.5A |
| 同步整流器： | 是 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 20-SOIC（0.295"，7.50mm 宽） |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 20-SOIC（宽型） |
| 其它名称： | MIC2177BWMTR MIC2177BWMTR-ND |
Micrel, Inc.
given in the “Applications Information” section. Note that
? I L varies as a function of input voltage, and this also
causes I MIN to vary. In applications where the input
voltage changes by a factor of two, I MIN will typically vary
from 130mA to 250mA.
During low-dropout operation, the minimum current
thresh-old circuit reduces the minimum value of I L1(peak)
for PWM operation. This compensates for ? I L1
decreasing to almost zero when the difference between
V IN and V OUT is very low.
Changing from Skip to PWM Mode
The MIC2177 will automatically change from skip to
PWM mode when I LOAD exceeds 300mA. During skip-
mode operation, it can supply up to 300mA, and when
I LOAD exceeds this limit, V OUT will fall below its nominal
value. At this point, the MIC2177 begins operating in
PWM mode. Note that the maximum value of I LOAD for
skip mode is greater than the minimum value required
for PWM mode. This current hysteresis prevents the
MIC2177 from toggling between modes when I LOAD is in
the range of 100mA to 300mA.
MIC2177
The low output comparator determines when V OUT is low
enough for the regulator to change operating modes. It
detects when the feedback voltage is 3% below nominal,
and pulls the AUTO pin to ground. When AUTO is less
than 1.6V, the PWM/skip-mode select logic places the
MIC2177 into PWM operation. The external 2.2nF
capacitor connected to AUTO is charged by a 10μA
current source after the regulator begins operating in
PWM mode. As a result, AUTO stays below 1.6V for
several switching cycles after PWM operation begins,
forcing the MIC2177 to remain in PWM mode during this
transition.
External PWM-Mode Selection
The MIC2177 can be forced to operate in only PWM
mode by connecting AUTO to ground. This prevents
skip-mode operation in applications that are sensitive to
switching noise.
April 2008
10
M9999-042108
相关PDF资料 |
PDF描述 |
|---|---|
| MIC2178BWM TR | IC REG BUCK SYNC ADJ 2.5A 20SOIC |
| MIC2179BSM TR | IC REG BUCK SYNC ADJ 1.5A 20SSOP |
| MIC2182-3.3YM | IC REG CTRLR BUCK PWM CM 16-SOIC |
| MIC2183BQS TR | IC REG CTRLR BUCK PWM CM 16-QSOP |
| MIC2184YQS | IC REG CTRLR BUCK PWM CM 16-QSOP |
相关代理商/技术参数 |
参数描述 |
|---|---|
| MIC2177YWM | 功能描述:直流/直流开关调节器 2.5A 200kHz Synchronous Switcher 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 |
| MIC2177YWM TR | 功能描述:直流/直流开关调节器 2.5A 200kHz Synchronous Switcher 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 |
| MIC2177YWM-TR | 功能描述:Buck Switching Regulator IC Positive Adjustable 1.245V 1 Output 2.5A 20-SOIC (0.295", 7.50mm Width) 制造商:microchip technology 系列:- 包装:剪切带（CT） 零件状态:停产 功能:降压 输出配置:正 拓扑:降压 输出类型:可调式 输出数:1 电压 - 输入（最小值）:4.5V 电压 - 输入（最大值）:16.5V 电压 - 输出（最小值/固定）:1.245V 电压 - 输出（最大值）:16.5V 电流 - 输出:2.5A 频率 - 开关:200kHz 同步整流器:无 工作温度:-40°C ~ 125°C （TJ） 安装类型:表面贴装 封装/外壳:20-SOIC（0.295"，7.50mm 宽） 供应商器件封装:20-SOIC W 标准包装:1 |
| MIC2178 | 制造商:MICREL 制造商全称:Micrel Semiconductor 功能描述:2.5A Synchronous Buck Regulator |
| MIC2178_05 | 制造商:MICREL 制造商全称:Micrel Semiconductor 功能描述:2.5A Synchronous Buck Regulator |
发布紧急采购，3分钟左右您将得到回复。