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| 型号： | MIC2238-G4YML TR |
| 厂商： | Micrel Inc |
| 文件页数： | 10/16页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC 0.8A DL 12MLF |
| 标准包装： | 1 |
| 类型： | 降压（降压） |
| 输出类型： | 固定 |
| 输出数： | 2 |
| 输出电压： | 1.2V，1.8V |
| 输入电压： | 2.5 V ~ 5.5 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 2.5MHz |
| 电流 - 输出： | 800mA |
| 同步整流器： | 是 |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 12-VFDFN 裸露焊盘，12-MLF? |
| 包装： | 标准包装 |
| 供应商设备封装： | 12-MLF?（4x4） |
| 产品目录页面： | 1092 (CN2011-ZH PDF) |
| 其它名称： | 576-3279-6 |
V OUT = V REF × ?
? R1 ?
+ 1 ?
Micrel, Inc.
time is approximately 1μs per 1pF of capacitance. For
example, a 390pF capacitor at the PGOOD pin will
cause the PGOOD pin voltage to rise from low to high in
around 390μs. A PGOOD capacitor is recommended to
prevent large output voltage transients from triggering
the PGOOD flag unexpectedly.
Figure 1. Power Good Circuit
FB1/FB2
The feedback pin (FB) provides the control path to
control the output. For adjustable versions, a resistor
divider connecting the feedback to the output is used to
adjust the desired output voltage. The output voltage is
calculated as follows:
? R2 ?
where V REF is equal to 0.8V.
A feedforward capacitor is recommended for most
MIC2238
designs using the adjustable output voltage option. To
reduce battery current draw, a 100K ? feedback resistor
is recommended from the output to the FB pin (R1).
Also, a feedforward capacitor should be connected
between the output and feedback (across R1). The large
resistor value and the parasitic capacitance of the FB pin
can cause a high frequency pole that can reduce the
overall system phase margin. By placing a feedforward
capacitor, these effects can be significantly reduced.
Refer to the Feedback section for recommended
feedforward capacitor values.
SW1/SW2
The switch (SW) pin connects directly to the inductor
and provides the switching current necessary to operate
in PWM mode. Due to the high speed switching on this
pin, the switch node should be routed away from
sensitive nodes.
PGND
Power ground (PGND) is the ground path for the high
current PWM mode. The current loop for the power
ground should be as small as possible and separate
from the Analog ground (AGND) loop. Refer to the layout
considerations for more details.
AGND
Signal ground (AGND) is the ground path for the biasing
and control circuitry. The current loop for the signal
ground should be separate from the Power ground
(PGND) loop. Refer to the layout considerations for more
details.
April 2010
10
M9999-040810-A
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MIC2238-GF9YML | 制造商:MICREL 制造商全称:Micrel Semiconductor 功能描述:2.5MHz Dual Phase PWM Buck Regulator |
| MIC2238-GFHYML | 制造商:Rochester Electronics LLC 功能描述: 制造商:RF Micro Devices Inc 功能描述: |
| MIC2238-GFHYML TR | 功能描述:直流/直流开关调节器 High Efficiency Dual 800/800mA Buck 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 |
| MIC2238-GFHYML-TR | 功能描述:Buck Switching Regulator IC Positive Fixed 1.575V, 1.8V 2 Output 800mA 12-VFDFN Exposed Pad, 12-MLF? 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:固定 输出数:2 电压 - 输入（最小值）:2.5V 电压 - 输入（最大值）:5.5V 电压 - 输出（最小值/固定）:1.575V，1.8V 电压 - 输出（最大值）:- 电流 - 输出:800mA 频率 - 开关:2.5MHz 同步整流器:是 工作温度:-40°C ~ 125°C （TJ） 安装类型:表面贴装 封装/外壳:12-VFDFN 裸焊盘，12-MLF? 供应商器件封装:12-MLF?（4x4） 标准包装:1 |
| MIC2238-GSYML | 制造商:MICREL 制造商全称:Micrel Semiconductor 功能描述:2.5MHz Dual Phase PWM Buck Regulator |
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