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参数资料
| 型号： | MIC33153-4YHJ TR |
| 厂商： | Micrel Inc |
| 文件页数： | 12/17页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC 1.2V 1.2A 14MLF |
| 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： | 1.2V |
| 输入电压： | 2.7 V ~ 5.5 V |
| PWM 型： | 混合物 |
| 频率 - 开关： | 4MHz |
| 电流 - 输出： | 1.2A |
| 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： | 14-VFDFN 裸露焊盘，14-MLF? |
| 包装： | 标准包装 |
| 供应商设备封装： | 14-MLF?（3x3.5） |
| 其它名称： | 576-3903-6 |
V OUT × I OUT
Efficiency Loss = ? 1 ? ? ? ? × 100
? V OUT × I OUT + P DCR
? ?
? ? ?
I LOAD > ? ?
? ?
Micrel Inc.
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
MOSFETs, thereby 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:
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 MIC33153:
MIC33153
HyperLight Load? Mode
MIC33153 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 MIC33153 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
MIC33153 during light load currents by only switching
when it is needed. As the load current increases, the
MIC33153 goes into continuous conduction mode (CCM)
and switches at a frequency centered at 4MHz. The
equation to calculate the load when the MIC33153 goes
into continuous conduction mode may be approximated
by the following formula:
? (V IN ? V OUT ) × D ?
? 2L × f ?
5
4.5
4
3.5
3
2.5
2
1.5
1
0.5
0
V OUTMAX vs. V IN
100mA
400mA
800mA
1.2A
As shown in the above equation, the load at which
MIC33153 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). For example, if V IN = 3.6V, V OUT =1.8V,
D=0.5, f=4MHz and the internal inductance of MIC33153
is 0.47 μ H, then the device will enter HyperLight Load?
mode or PWM mode at approximately 200mA.
2.5
3
3.5
4
4.5
5
5.5
INPUT VOLTAGE (V)
September 2010
12
M9999-092910-A
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MIC33153YHJ | 制造商:Micrel 功能描述:Regulator 4MHz PWM 1.2A w/Inductor MLF14 |
| MIC33153YHJ TR | 功能描述:直流/直流开关调节器 4MHz PWM 1.2A Internal Inductor Buck Switcher with Soft-Start, Power Good & 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 |
| MIC33153YHJ-EV | 功能描述:MIC33153 HyperLight Load? DC/DC, Step Down 1, Non-Isolated Outputs Evaluation Board 制造商:microchip technology 系列:HyperLight Load? 零件状态:有效 主要用途:DC/DC，步降 输出和类型:1，非隔离 功率 - 输出:- 电压 - 输出:1.8V 电流 - 输出:1.2A 电压 - 输入:2.7 V ~ 5.5 V 稳压器拓扑:降压 频率 - 开关:4MHz 板类型:完全填充 所含物品:板 使用的 IC/零件:MIC33153 标准包装:1 |
| MIC33153YHJ-TR | 功能描述:Buck Switching Regulator IC Positive Adjustable 0.62V 1 Output 1.2A 14-VFDFN Exposed Pad, 14-MLF? 制造商:microchip technology 系列:HyperLight Load? 包装:剪切带（CT） 零件状态:有效 功能:降压 输出配置:正 拓扑:降压 输出类型:可调式 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）:0.62V 电压 - 输出（最大值）:3.6V 电流 - 输出:1.2A 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:14-VFDFN 裸露焊盘，14-MLF? 供应商器件封装:14-MLF?（3x3.5） 标准包装:1 |
| MIC33163YGJ-T5 | 功能描述:Buck Switching Regulator IC Positive Adjustable 0.7V 1 Output 1A 20-PowerTFQFN 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:可调式 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）:0.7V 电压 - 输出（最大值）:5V 电流 - 输出:1A 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:20-PowerTFQFN 供应商器件封装:20-QFN（2.5x3） 标准包装:1 |
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