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参数资料
| 型号： | MIC23051-CGYML TR |
| 厂商： | Micrel Inc |
| 文件页数： | 10/13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 |
Efficiency _Loss = ? 1 ? ? ?
? ? × 100
? V OUT × I OUT + L_Pd ? ? ?
? ?
I LOAD = ?
? (V IN ? V OUT ) × D ?
Micrel, Inc.
MOSFETs, reducing the internal R DSON . This improves
efficiency by reducing DC losses in the device. All but the
inductor losses are inherent to the device. In which case,
inductor selection becomes increasingly critical in
efficiency calculations. As the inductors are reduced in
size, the DC resistance (DCR) can become quite
significant. The DCR losses can be calculated as follows;
L_Pd = I OUT2 × DCR
From that, the loss in efficiency due to inductor resistance
can be calculated as follows;
? ? V OUT × I OUT ? ?
?
Efficiency loss due to DCR is minimal at light loads and
gains significance as the load is increased. Inductor
selection becomes a trade-off between efficiency and size
in this case.
MIC23051
HyperLight Load Mode?
MIC23051 uses a minimum on and off time proprietary
control loop. When the output voltage falls below the
regulation threshold, the error comparator begins a
switching cycle that turns the PMOS on and keeps it on for
the duration of the minimum-on-time. When the output
voltage is over the regulation threshold, the error
comparator turns the PMOS off for a minimum-off-time.
The NMOS acts as an ideal rectifier that conducts when
the PMOS is off. Using a NMOS switch instead of a diode
allows for lower voltage drop across the switching device
when it is on. The asynchronous switching combination
between the PMOS and the NMOS allows the control loop
to work in discontinuous mode for light load operations. In
discontinuous mode MIC23051 works in pulse frequency
modulation (PFM) to regulate the output. As the output
current increases, the switching frequency increases. This
improves the efficiency of MIC23051 during light load
currents. As the load current increases, the MIC23051
goes into continuous conduction mode (CCM) at a
constant frequency of 4MHz. The equation to calculate the
load when the MIC23051 goes into continuous conduction
mode may be approximated by the following formula:
?
? 2L × f ?
July 2009
10
M9999—070809-F
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