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参数资料
| 型号： | MIC2224YML TR |
| 厂商： | Micrel Inc |
| 文件页数： | 11/13页 |
| 文件大小： | 0K |
| 描述： | IC CONV PWM BUCK 2MHZ 10-MLF |
| 标准包装： | 1 |
| 应用： | 转换器，2.5G，3G CDMA RF 功率放大器 |
| 输入电压： | 2.7 V ~ 5.5 V |
| 输出数： | 1 |
| 输出电压： | 0.3 V ~ 5.5 V |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 10-VFDFN 裸露焊盘，10-MLF? |
| 供应商设备封装： | 10-MLF?（3x3） |
| 包装： | 标准包装 |
| 产品目录页面： | 1092 (CN2011-ZH PDF) |
| 其它名称： | 576-2655-6 |
V OUT ? ? 1 ?
? ?
I PK = I OUT
? V IN ?
Micrel, Inc.
Application Information
The MIC2224 is a 600mA PWM power supply that
utilizes a dynamically adjustable output voltage for
powering RF power amplifiers. By dynamically adjusting
the output power as necessary, battery life can be
dramatically improved in battery powered RF
applications. For instances where high power is
required, the MIC2224 also has a bypass mode. Bypass
mode is enabled by driving the DAC pin above 1.2V.
This bypasses the input supply directly to the output
through a highly efficient, short circuit protected, 40m ? P
channel MOSFET.
Input Capacitor
A minimum 1μF ceramic is recommended on the VIN pin
for bypassing. X5R or X7R dielectrics are recommended
for the input capacitor. Y5V dielectrics lose most of their
capacitance over temperature and are therefore not
recommended. A minimum 1μF is recommended close
to the VIN and PGND pins for high frequency filtering.
Smaller case size capacitors are recommended due to
their lower ESR and ESL.
Output Capacitor
The MIC2224 is optimized for a 1μF ceramic output
capacitor. The MIC2224 utilizes type III internal
compensation and utilizes internal high frequency zeros
to compensate for the double pole roll off of the LC filter.
For this reason, larger output capacitors can create
MIC2224
instabilities. X5R or X7R dielectrics are recommended
for the output capacitor. Y5V dielectrics lose most of
their capacitance over temperature and are therefore not
recommended. In addition to a 1μF, a small 10nF is
recommended close to the load for high frequency
filtering. Smaller case size capacitors are recommended
due to there lower ESR and ESL.
Inductor Selection
The MIC2224 is designed for use with a 4.7μH inductor.
Proper selection should ensure the inductor can handle
the maximum average and peak currents required by the
load. Maximum current ratings of the inductor are
generally given in two methods; permissible DC current
and saturation current. Permissible DC current can be
rated either for a 40°C temperature rise or a 10% to 20%
loss in inductance. Ensure the inductor selected can
handle the maximum operating current. When saturation
current is specified, make sure that there is enough
margin that the peak current will not saturate the
inductor. Peak inductor current can be calculated as
follows:
? V OUT ?
+
2 × f × L
September 2006
11
M9999-091106
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| MIC2225-4KYMT TR | 功能描述:直流/直流开关调节器 Ultra Small Dual Channel DC/DC + LDO 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 |
| MIC2225-4KYMT-TR | 功能描述:Linear And Switching Voltage Regulator IC 2 Output Step-Down (Buck) (1), Linear (LDO) (1) 2MHz 10-UFDFN, 10-TMLF? 制造商:microchip technology 系列:- 包装:剪切带（CT） 零件状态:停产 拓扑:降压（降压）（1），线性（LDO）（1） 功能:任何功能 输出数:2 频率 - 开关:2MHz 电压/电流 - 输出 1:1.2V，600mA 电压/电流 - 输出 2:2.6V，300mA 电压/电流 - 输出 3:- 带 LED 驱动器:无 带监控器:无 带定序器:无 电压 - 电源:2.7 V ~ 5.5 V 工作温度:-40°C ~ 125°C 安装类型:表面贴装 封装/外壳:10-UFDFN，10-TMLF? 供应商器件封装:10-TMLF?（2x2） 标准包装:1 |
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