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参数资料
| 型号： | MIC4724YMME |
| 厂商： | Micrel Inc |
| 文件页数： | 10/19页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK ADJ 3A 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 1V |
| 输入电压： | 3 V ~ 6 V |
| 频率 - 开关： | 2MHz |
| 电流 - 输出： | 3A |
| 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）裸露焊盘 |
| 包装： | 管件 |
| 供应商设备封装： | 10-MSOP 裸露焊盘 |
| 产品目录页面： | 1093 (CN2011-ZH PDF) |
| 其它名称： | 576-3120-5 |
( V OUT + V D )
T OFF =
Efficiency = OUT × 100
Micrel, Inc.
?
L
The total off time can be calculated as;
1 ? D
2.0MHz
MIC4724
When the inductor current (IL) has completely
discharged, the voltage on the switch node rings at the
frequency determined by the parasitic capacitance and
the inductor value. In Figure 5, it is drawn as a DC
voltage, but to see actual operation (with ringing) refer to
the functional characteristics.
Discontinuous mode of operation has the advantage
over full PWM in that at light loads, the MIC4724 will skip
pulses as necessary, reducing gate drive losses,
drastically improving light load efficiency.
Efficiency Considerations
Calculating the efficiency is as simple as measuring
power out and dividing it by the power in;
P
P IN
Where input power (P IN ) is;
P IN = V IN × I IN
and output power (P OUT ) is calculated as;
P OUT = V OUT × I OUT
The Efficiency of the MIC4724 is determined by several
Figure 4. Off-Time
factors.
?
Rdson (Internal P-channel Resistance)
Discontinuous Operation
Discontinuous operation is when the inductor current
discharges to zero during the off cycle. Figure 5
demonstrates the switch voltage and inductor currents
during discontinuous operation.
? Diode conduction losses
? Inductor Conduction losses
? Switching losses
Rdson losses are caused by the current flowing through
the high side P-channel MOSFET. The amount of power
loss can be approximated by;
P SW = R DSON × I OUT 2 × D
Where D is the duty cycle.
Since the
MIC4724
uses
an internal P-channel
MOSFET, Rdson losses are inversely proportional to
supply voltage. Higher supply voltage yields a higher
gate to source voltage, reducing the Rdson, reducing the
MOSFET conduction losses. A graph showing typical
Rdson vs input supply voltage can be found in the typical
characteristics section of this datasheet.
Diode conduction losses occur due to the forward
voltage drop (V F ) and the output current. Diode power
losses can be approximated as follows;
P D = V F × I OUT × ( 1 ? D )
Figure 5. Discontinuous Operation
For this reason, the Schottky diode is the rectifier of
choice. Using the lowest forward voltage drop will help
reduce diode conduction losses, and improve efficiency.
Duty cycle, or the ratio of output voltage to input voltage,
determines whether the dominant factor in conduction
losses will be the internal MOSFET or the Schottky
diode. Higher duty cycles place the power losses on the
high side switch, and lower duty cycles place the power
June 2008
10
M9999-062408-A
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| MIC4724YMME TR | 功能描述:直流/直流开关调节器 3A 2MHz Buck Regulator in Epad MSOP-10 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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| MIC47300WD TR | 功能描述:低压差稳压器 - LDO 3A Low Voltage, ADJ. High Bandwidth LDO Regulator with Dual Input Supplies RoHS:否 制造商:Texas Instruments 最大输入电压:36 V 输出电压:1.4 V to 20.5 V 回动电压（最大值）:307 mV 输出电流:1 A 负载调节:0.3 % 输出端数量: 输出类型:Fixed 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:VQFN-20 |
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