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| 型号： | MIC2230-SSYML TR |
| 厂商： | Micrel Inc |
| 文件页数： | 10/18页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC 3.3V 0.8A 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： | 3.3V |
| 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： | 576-3467-6 |
Micrel, Inc.
Functional Block Diagram
Functional Description
VIN
VIN provides power to the MOSFETs for the switch
mode regulator section, along with the current limiting
sensing. Due to the high switching speeds, a 10μF
capacitor is recommended close to VIN and the power
ground (PGND) pin for bypassing. Please refer to layout
recommendations.
AVIN
Analog V IN (AVIN) provides power to the analog supply
circuitry. AVIN and VIN must be tied together. Careful
layout should be considered to ensure high frequency
switching noise caused by VIN is reduced before
reaching AVIN. A 1μF capacitor as close to AVIN as
possible is recommended. See layout recommendations
for detail.
EN1
Enable 1 controls the on and off state of regulator 1. A
high logic on Enable 1 (EN1) activates regulator 1 while
a low logic deactivates regulator 1. MIC2230 features
built-in soft-start circuitry that reduces in-rush current
and prevents the output voltage from overshooting at
start up.
MIC2230
EN2
Enable 2 controls the on and off state of regulator 2. A
high logic on Enable 2 (EN2) activates regulator 2 while
a low logic deactivates regulator 2. MIC2230 features
built-in soft-start circuitry that reduces in-rush current
and prevents the output voltage from overshooting at
start up.
/FPWM
The Forced PWM Mode selects the mode of operation
for this device. Grounding this pin forces the device to
stay in constant frequency PWM mode only. Pulling this
pin high enables automatic selection of Trickle or PWM
mode operation, depending on the load. While /FPWM is
high and the load is below 100mA, the device will go into
Trickle Mode?. If the load is above 100mA, PWM mode
will automatically be selected. Do not leave this pin
floating.
PGOOD
The Power Good Output is pulled down unless the
regulator 1 output voltage is within +6.25% or -8.5% of
regulation. When the output voltage is in regulation, the
PGOOD capacitor will be charged to AVIN by an internal
5 μ A current source through a 1k ? resistor. The charge
April 2010
10
M9999-040810-C
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| MIC2238-AAYML 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 |
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