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参数资料
| 型号： | MIC23051-CGYML TR |
| 厂商： | Micrel Inc |
| 文件页数： | 9/13页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC 1V/1.8V 8MLF |
| 产品培训模块： | MIC23xxx HyperLight Load™ Regulators |
| 标准包装： | 1 |
| 系列： | HyperLight Load® |
| 类型： | 降压（降压） |
| 输出类型： | 固定 |
| 输出数： | 1 |
| 输出电压： | 1V，1.8V |
| 输入电压： | 2.7 V ~ 5.5 V |
| PWM 型： | 混合物 |
| 频率 - 开关： | 4MHz |
| 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： | 8-VFDFN 裸露焊盘，8-MLF? |
| 包装： | 标准包装 |
| 供应商设备封装： | 8-MLF?（2x2） |
| 产品目录页面： | 1094 (CN2011-ZH PDF) |
| 其它名称： | 576-3015-6 |
Micrel, Inc.
MIC23051
Applications Information
Input Capacitor
significant efficiency
Considerations.
loss.
Refer
to
the
Efficiency
Efficiency _% = ? ? OUT
? ? × 100
A minimum of 2.2μF ceramic capacitor should be placed
close to the VIN pin and PGND 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 MIC23051 was designed for use with a 2.2μF or
greater ceramic output capacitor. A low equivalent series
resistance (ESR) ceramic output capacitor either X7R or
X5R is recommended. Y5V and Z5U dielectric capacitors,
aside from the undesirable effect of their wide variation in
capacitance over temperature, become resistive at high
frequencies.
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 MIC23051 was designed for use with an inductance
range from 0.47μH to 2.2μH. Typically, a 1μH inductor is
recommended for a balance of transient response,
efficiency and output ripple. For faster transient response a
0.47μH inductor may be used. For lower output ripple, a
2.2μH is recommended.
Maximum current ratings of the inductor are generally
given in two methods; permissible DC current and
saturation current. Permissible DC current can be rated
Compensation
The MIC23051 is designed to be stable with a 0.47μH to
2.2μH inductor with a 2.2μF ceramic (X5R) output
capacitor.
Efficiency Considerations
Efficiency is defined as the amount of useful output power,
divided by the amount of power supplied.
? 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 considerations
and it reduces consumption of current for battery powered
applications. Reduced current draw from a battery
increases the devices operating time and is critical in hand
held devices.
There are two types of losses 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 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 driving the gates on
and off at a constant 4MHz frequency and the switching
transitions make up the switching losses.
Efficiency V OUT = 1.8V
100
either for a 40°C temperature rise or a 10% to 20% loss in
inductance. Ensure the inductor selected can handle the
90
V IN = 2.7V
maximum operating current. When saturation current is
specified, make sure that there is enough margin so that
the peak current of the inductor does not cause it to
80
70
V IN = 3.3V
V IN = 3.6V
saturate. Peak current can be calculated as follows:
1
I PK = I OUT + V OUT (1-V OUT /V IN )/2fL
As shown by the previous calculation, the peak inductor
current is inversely proportional to the switching frequency
60
50
V OUT = 1.8V
L = 1μH
10 100 1000
OUTPUT CURRENT (mA)
and the inductance; the lower the switching frequency or
the inductance the higher the peak current. As input
voltage increases the peak current also increases.
The size of the inductor depends on the requirements of
the application. Refer to the Application Circuit and Bill of
Material for details.
DC resistance (DCR) is also important. While DCR is
inversely proportional to size, DCR can represent a
The Figure above shows an efficiency curve. From no load
to 100mA, efficiency losses are dominated by quiescent
current losses, gate drive and transition losses. By using
the HyperLight Load mode the MIC23051 is able to
maintain high efficiency at low output currents.
Over 100mA, efficiency loss is dominated by MOSFET
R DSON and inductor losses. Higher input supply voltages
will increase the Gate to Source threshold on the internal
July 2009
9
M9999—070809-F
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