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| 型号： | MIC23050-CYML TR |
| 厂商： | Micrel Inc |
| 文件页数： | 11/15页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC 1V 0.6A 8MLF |
| 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 |
| 输入电压： | 2.7 V ~ 5.5 V |
| PWM 型： | 电流模式，混合 |
| 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） |
| 其它名称： | 576-3649-6 MIC23050-CYML TRDKR MIC23050-CYML TRDKR-ND |
I LOAD = ?
? (V IN ? V OUT ) × D ?
Efficiency Loss = ? 1 ? ? ?
? ? × 100
? V OUT × I OUT + L Pd ? ? ?
? ?
Micrel, Inc.
Figure 1. MIC23050 Efficiency Curve
Figure 1 illustrates an efficiency curve for the MIC23050.
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
MIC23050 is able to maintain high efficiency at low output
currents.
Over 100mA, efficiency loss is dominated by MOSFET
RDSON and inductor losses. Higher input supply voltages
will increase the gate-to-source threshold on the internal
MOSFETs, reducing the internal RDSON. 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.
MIC23050
HyperLight Load Mode?
MIC23050 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 MIC23050 works in pulse frequency
modulation (PFM) to regulate the output. As the output
current increases, the switching frequency increases. This
improves the efficiency of MIC23050 during light load
currents. As the load current increases, the MIC23050
goes into continuous conduction mode (CCM) at a
constant frequency of 4MHz. The equation to calculate the
load when the MIC23050 goes into continuous conduction
mode may be approximated by the following formula:
?
? 2L × f ?
September 2011
11
M9999-092211-E
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MIC23050-GYML | 制造商:Rochester Electronics LLC 功能描述: 制造商:RF Micro Devices Inc 功能描述: |
| MIC23050-GYML TR | 功能描述:直流/直流开关调节器 High Efficiency 600mA Buck Switcher (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 |
| MIC23050-GYML-TR | 功能描述:Buck Switching Regulator IC Positive Fixed 1.8V 1 Output 600mA 8-VFDFN Exposed Pad, 8-MLF? 制造商:microchip technology 系列:HyperLight Load? 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:固定 输出数:1 电压 - 输入（最小值）:2.7V 电压 - 输入（最大值）:5.5V 电压 - 输出（最小值/固定）:1.8V 电压 - 输出（最大值）:- 电流 - 输出:600mA 频率 - 开关:4MHz 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:8-VFDFN 裸露焊盘，8-MLF? 供应商器件封装:8-MLF?（2x2） 标准包装:1 |
| MIC23050-SYML | 制造商:Micrel 功能描述:Sw. Regulator Buck 3.3V 600mA 4MHz MLF8 |
| MIC23050-SYML TR | 功能描述:直流/直流开关调节器 High Efficiency 600mA Buck Switcher (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 |
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