参数资料
| 型号： | MIC33030-AYHJ TR |
| 厂商： | Micrel Inc |
| 文件页数： | 12/18页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK ADJ 0.4A 10HMLF |
| 标准包装： | 1 |
| 系列： | HyperLight Load® |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 0.7 V ~ 3.6 V |
| 输入电压： | 2.7 V ~ 5.5 V |
| PWM 型： | 混合物 |
| 频率 - 开关： | 8MHz |
| 电流 - 输出： | 400mA |
| 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-TFQFN 裸露焊盘，10-MLF? |
| 包装： | 标准包装 |
| 供应商设备封装： | 10-MLF?（2.5x2） |
| 其它名称： | 576-3720-6 |
V OUT × I OUT
Efficiency Loss = ? 1 ? ? ? ? × 100
V OUT × I OUT + P DCR
? ?
? ? ?
?
? ?
I LOAD > ? ?
Micrel Inc.
The DCR losses can be calculated as follows:
P DCR = I OUT2 x DCR
From that, the loss in efficiency due to inductor
resistance can be calculated as follows:
? ? ? ?
?
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.
The effect of MOSFET voltage drops and DCR losses in
conjunction with the maximum duty cycle combine to
limit maximum output voltage for a given input voltage.
The following graph shows this relationship based on the
typical resistive losses in the MIC33030:
MIC33030
HyperLight Load? Mode
MIC33030 uses a minimum on and off time proprietary
control loop (patented by Micrel). 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. This increases the output voltage. If
the output voltage is over the regulation threshold, then
the error comparator turns the PMOS off for a minimum-
off-time until the output drops below the threshold. 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, the MIC33030 works
in pulse frequency modulation (PFM) to regulate the
output. As the output current increases, the off-time
decreases, thus provides more energy to the output.
This switching scheme improves the efficiency of
MIC33030 during light load currents by only switching
when it is needed. As the load current increases, the
MIC33030 goes into continuous conduction mode (CCM)
and switches at a frequency centered at 8MHz. The
equation to calculate the load when the MIC33030 goes
into continuous conduction mode may be approximated
by the following formula:
? ( V IN ? V OUT ) × D ?
? 2 L × f ?
As shown in the above equation, the load at which
MIC33030 transitions from HyperLight Load? mode to
PWM mode is a function of the input voltage (V IN ), output
voltage (V OUT ), duty cycle (D), inductance (L) and
frequency (f). Since the inductance of MIC33030 is
0.36 μ H, the device will enter HyperLight Load? mode or
PWM mode at approximately 150mA.
February 2011
12
M9999-020311-C
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MIC33030-GYHJ | 制造商:MICREL 制造商全称:Micrel Semiconductor 功能描述:8MHz 400mA Internal Inductor Buck Regulator with HyperLight Load |
| MIC33030-GYHJ T5 | 功能描述:直流/直流开关调节器 8MHz 400mA Internal Inductor Buck Regulator with HyperLight Load 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 |
| MIC33030-GYHJ TR | 功能描述:直流/直流开关调节器 8MHz 400mA Internal Inductor Buck Regulator with HyperLight Load 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 |
| MIC33030-GYHJ-TR | 功能描述:Buck Switching Regulator IC Positive Fixed 1.8V 1 Output 400mA 10-TFDFN Exposed Pad, 10-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:400mA 频率 - 开关:8MHz 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:10-TFDFN 裸露焊盘，10-MLF? 供应商器件封装:10-MLF?（2.5x2） 标准包装:1 |
| MIC33030-JYHJ | 制造商:MICREL 制造商全称:Micrel Semiconductor 功能描述:8MHz 400mA Internal Inductor Buck Regulator with HyperLight Load |
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