- 您现在的位置：买卖IC网 > PDF目录14468 > MIC2202YMM (Micrel Inc)IC REG BUCK ADJ 0.6A 10MSOP PDF资料下载
参数资料
| 型号： | MIC2202YMM |
| 厂商： | Micrel Inc |
| 文件页数： | 7/19页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK ADJ 0.6A 10MSOP |
| 标准包装： | 100 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 可调至 0.5V |
| 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： | 无 |
| 工作温度： | -40°C ~ 125°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 10-TFSOP，10-MSOP（0.118"，3.00mm 宽） |
| 包装： | 管件 |
| 供应商设备封装： | 10-MSOP |
| 产品目录页面： | 1092 (CN2011-ZH PDF) |
| 其它名称： | 576-1719-5 MIC2202YMM-ND |
Efficiency % = ? ? OUT
? ? × 100
Micrel, Inc.
Application Information
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, aside from losing
most of their capacitance over temperature, they also
become resistive at high frequencies. This reduces their
ability to filter out high frequency noise.
Output Capacitor
The MIC2202 was designed specifically for the use of a
1μF ceramic output capacitor. This value can be
increased to improve transient performance. Since the
MIC2202 is voltage mode, the control loop relies on the
inductor and output capacitor for compensation. For this
reason, do not use excessively large output capacitors.
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 MIC2202.
Total output capacitance should not exceed 15μF. Large
values of capacitance can cause current limit to engage
during start-up. If larger than 15μF 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):
MIC2202
below for a more detailed description.
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 OUT ?
? 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 considera-
tions and it reduces consumption of current for battery
powered applications. Reduced current draw from a
battery increases the devices operating time, critical in
hand held devices.
There are two loss terms in switching converters: DC
losses and switching losses. DC losses are simply the
power dissipation of I 2 R. Power is dissipated in the high
side switch during the on cycle. Power loss is equal to
the high side MOSFET RDS (ON) 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.
?
?
?
Inductance
Rated current value
Size requirements
Figure 2 shows an efficiency curve. The non-shaded
portion, from 0mA to 200mA, efficiency losses are
dominated by quiescent current losses, gate drive and
transition losses. In this case, lower supply voltages
? DC resistance (DCR)
The MIC2202 is designed for use with a 1μH to 4.7μH
inductor.
yield greater efficiency in that they require less current to
drive the MOSFETs and have reduced input power
consumption.
0
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% 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.
The size requirements refer to the area and height
requirements that are necessary to fit a particular
design. Please refer to the inductor dimensions on their
datasheet.
DC resistance is also important. While DCR is inversely
100
95
90
85
80
75
70
65
60
55
50
Efficiency
vs. Output Current
4.2V IN
5V IN
3.3V OUT
0.1 0.2 0.3 0.4 0.5 0.6
OUTPUT CURRENT (A)
proportional to size, DCR can represent a significant
efficiency loss. Refer to the “Efficiency Considerations”
Figure 2. Efficiency Curve
March 2007
7
M9999-031907
相关PDF资料 |
PDF描述 |
|---|---|
| VI-BWP-EX-F4 | CONVERTER MOD DC/DC 13.8V 75W |
| VE-J5X-EX-B1 | CONVERTER MOD DC/DC 5.2V 75W |
| SP6652ER-L | IC REG BUCK SYNC ADJ 1A 10DFN |
| VI-BWP-EX-F3 | CONVERTER MOD DC/DC 13.8V 75W |
| VI-BWP-EX-F1 | CONVERTER MOD DC/DC 13.8V 75W |
相关代理商/技术参数 |
参数描述 |
|---|---|
| MIC2202YMM 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 |
| MIC2203 | 制造商:MICREL 制造商全称:Micrel Semiconductor 功能描述:High Efficiency 1MHz Synchronous Buck Regulator |
| MIC2203BML | 制造商:MICREL 制造商全称:Micrel Semiconductor 功能描述:High Efficiency 1MHz Synchronous Buck Regulator |
| MIC2203BML TR | 功能描述:IC REG BUCK ADJ 0.3A 10MLF 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 |
| MIC2203BMM | 功能描述:IC REG BUCK ADJ 0.3A 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 |
发布紧急采购，3分钟左右您将得到回复。