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参数资料
| 型号： | MIC2204BML TR |
| 厂商： | Micrel Inc |
| 文件页数： | 8/11页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ 0.6A 10MLF |
| 标准包装： | 5,000 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 可调至 1V |
| 输入电压： | 2.3 V ~ 5.5 V |
| PWM 型： | 电压模式 |
| 频率 - 开关： | 2MHz |
| 电流 - 输出： | 600mA |
| 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： | 10-VFDFN 裸露焊盘，10-MLF? |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 10-MLF?（3x3） |
| 其它名称： | MIC2204BMLTR |
Efficiency % = ? OUT OUT ? × 100
MIC2204
Applications Information
Input Capacitor
A minimum 1 μ F ceramic is recommended on the VIN pin for
bypassing. X5R or X7R dielectrics are recommended for the
input capacitor. Y5V dielectrics are not recommended: they
lose most of their capacitance over temperature and also
become resistive at high frequencies. This reduces their
ability to filter out high frequency noise.
Output Capacitor
The MIC2204 was designed specifically for the use of a 4.7 μ F
ceramic output capacitor. The output capacitor requires
either an X7R or X5R dielectric. Y5V and Z5U dielectric
capacitors, aside from the undesirable effect of their wide
variation in capacitance over temperature, become resistive
at high frequencies. Using Y5V or Z5U capacitors will cause
instability in the MIC2204. For output voltages less than 1.6V,
a 10 μ F capacitor may be required for stability. See the
“Compensation” section for more detail.
Total output capacitance should not exceed 15 μ F. Large
values of capacitance can cause current limit to engage
during start-up. If larger than 15 μ F is required, a feed-forward
capacitor from the output to the feedback node should be
used to slow the start-up time.
Inductor Selection
Inductor selection will be determined by the following (not
necessarily in the order of importance):
? Inductance
? Rated current value
? Size requirements
? DC resistance (DCR)
The MIC2204 is designed for use with a 4.7 μ H inductor.
Maximum current ratings of the inductor are generally given
in two methods: permissible DC current and saturation cur-
rent. Permissible DC current can be rated either for a 40 ° C
temperature rise or a 10% loss in inductance. Ensure the
inductor selected can handle the maximum operating cur-
rent. When saturation current is specified, make sure that
there is enough margin that the peak current will not saturate
the inductor.
Micrel, Inc.
The size requirements refer to the area and height require-
ments that are necessary to fit a particular design. Please
refer to the inductor dimensions on their data sheet.
DC resistance is also important. While DCR is inversely
proportional to size, DCR can represent a significant effi-
ciency loss. Refer to the “ Efficiency Considerations ” below
for a more detailed description.
Table 1 below shows a list of recommended 4.7 μ H inductors
by manufacturer, part number and key specifications.
Bias Capacitor
A small 10nF ceramic capacitor is required to bypass the
BIAS pin. The use of low ESR ceramics provides improved
filtering for the bias supply.
Efficiency Considerations
Efficiency is defined as the amount of useful output power,
divided by the amount of power consumed.
? V × I ?
? V IN × I IN ?
Maintaining high-efficiency serves two purposes. It reduces
power dissipation in the power supply, reducing the need for
heat sinks and thermal design considerations and it reduces
consumption of current for battery powered applications.
Reduced current draw from a battery increases the devices
operating time, critical in handheld devices.
There are two loss terms in switching converters: DC losses
and switching losses. DC losses are simply the power dissi-
pation of I 2 R. For example, power is dissipated in the high-
side switch during the on cycle, where power loss is equal to
the high-side MOSFET R DSON multiplied by the Switch
Current 2 . During the off cycle, the low-side N-Channel
MOSFET conducts, also dissipating power. Device operating
current also reduces efficiency. The product of the quiescent
(operating) current and the supply voltage is another DC loss.
The current required to drive the gates on and off at a constant
2MHz frequency and the switching transitions make up the
switching losses.
Manufacturer
Sumida
Murata
Murata
Coilcraft
P/N
CDRH2D18-4R7
LQH43CN4R7M01
LQH32CN4R7M11
1008PS-472M
H(mm)
2
2.6
2.2
2.74
W(mm)
3.2
3.2
2.7
3.8
L(mm)
3.2
4.6
3.4
3.8
DCR(m ? )
81
150
195
350
Low Profile
TDK
Sumida
LDR5610T-4R7MR90
CMD4D06
1
0.8
5.2
6.3
5.8
5.8
240
216
Table 1. Component Selection Table
M9999-042205
8
April 2005
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相关代理商/技术参数 |
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| MIC2204BMM | 功能描述:IC REG BUCK SYNC ADJ 0.6A 10MSOP RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:20 系列:SIMPLE SWITCHER® 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:12V 输入电压:4 V ~ 60 V PWM 型:电压模式 频率 - 开关:52kHz 电流 - 输出:1A 同步整流器:无 工作温度:-40°C ~ 125°C 安装类型:通孔 封装/外壳:16-DIP（0.300"，7.62mm） 包装:管件 供应商设备封装:16-DIP 其它名称:*LM2575HVN-12LM2575HVN-12 |
| MIC2204BMM TR | 功能描述:IC REG BUCK SYNC ADJ 0.6A 10MSOP RoHS:否 类别:集成电路 (IC) >> PMIC - 稳压器 - DC DC 开关稳压器 系列:- 标准包装:20 系列:SIMPLE SWITCHER® 类型:降压（降压） 输出类型:固定 输出数:1 输出电压:12V 输入电压:4 V ~ 60 V PWM 型:电压模式 频率 - 开关:52kHz 电流 - 输出:1A 同步整流器:无 工作温度:-40°C ~ 125°C 安装类型:通孔 封装/外壳:16-DIP（0.300"，7.62mm） 包装:管件 供应商设备封装:16-DIP 其它名称:*LM2575HVN-12LM2575HVN-12 |
| MIC2204YML | 功能描述:直流/直流开关调节器 2MHz Synchronous Buck Regulator - Pb Free Finish 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 |
| MIC2204YML TR | 功能描述:直流/直流开关调节器 2MHz Synchronous Buck 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 |
| MIC2204YML-TR | 功能描述:Buck Switching Regulator IC Positive Adjustable 1V 1 Output 600mA 10-VFDFN Exposed Pad, 10-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:可调式 输出数:1 电压 - 输入（最小值）:2.3V 电压 - 输入（最大值）:5.5V 电压 - 输出（最小值/固定）:1V 电压 - 输出（最大值）:5.5V 电流 - 输出:600mA 频率 - 开关:2MHz 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:10-VFDFN 裸露焊盘，10-MLF? 供应商器件封装:10-MLF?（3x3） 标准包装:1 |
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