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| 型号： | MIC23153-GYMT TR |
| 厂商： | Micrel Inc |
| 文件页数： | 12/18页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC 1.8V 2A 10TMLF |
| 特色产品： | MIC23153 Synchronous Buck Regulator |
| 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： | 1.8V |
| 输入电压： | 2.7 V ~ 5.5 V |
| PWM 型： | 混合物 |
| 频率 - 开关： | 4MHz |
| 电流 - 输出： | 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： | 10-UFDFN 裸露焊盘，10-TMLF? |
| 包装： | 标准包装 |
| 供应商设备封装： | 10-TMLF?（2.5x2.5） |
| 其它名称： | 576-3652-6 |
Micrel Inc.
MIC23153
In HLL mode, the inductor is charged with a fixed Ton
pulse on the high side switch (HSD). After this, the LSD
is switched on and current falls at a rate V OUT /L. The
controller remains in HLL mode while the inductor falling
current is detected to cross approximately ? 50mA. When
the LSD (or T OFF ) time reaches its minimum and the
inductor falling current is no longer able to reach this
? 50mA threshold, the part is in CCM mode and
switching at a virtually constant frequency.
1.00
0.90
0.80
0.70
0.60
0.50
0.40
Efficiency v s. Output Current
V OUT = 1.8V @ 25°C
V IN = 3V
V IN = 3.6V
V IN = 5V
Once in CCM mode, the T OFF time will not vary.
Therefore, it is important to note that if L is large enough,
the HLL transition level will not be triggered.
That inductor is:
0.30
0.20
0.10
0.00001
0.001 0.1
OUT PUT CURRENT (A)
10
V OUT × 135ns
L MAX =
2 × 50mA
Compensation
The MIC23153 is designed to be stable with a 0.47μH to
2.2μH inductor with a 4.7μF ceramic (X5R) output
capacitor.
Duty Cycle
The typical maximum duty cycle of the MIC23153 is
80%.
Efficiency Considerations
Efficiency is defined as the amount of useful output
power, divided by the amount of power supplied.
Figure 2. Efficiency Under Load
The figure above shows an efficiency curve. 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
MIC23153 is able to maintain high efficiency at low
output currents.
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:
Efficiency % = ? ? OUT
?
? ? × 100
? V × I OUT
V IN × I IN
?
?
P DCR = I OUT2 x DCR
V OUT × I OUT
Efficiency Loss = ? 1 ? ? ? ? × 100
? V OUT × I OUT + P DCR
? ?
? ? ?
Maintaining high efficiency serves two purposes. It
reduces power dissipation in the power supply, reducing
the need for heat sinks and thermal design
considerations and it reduces consumption of current for
battery-powered applications. Reduced current draw
from a battery increases the devices operating time and
is critical in hand held devices.
There are two types of losses in switching converters;
DC losses and switching losses. DC losses are simply
the power dissipation of I 2 R. Power is dissipated in the
high side switch during the on cycle. Power loss is equal
to the high side MOSFET R DSON multiplied by the Switch
Current squared. During the off cycle, the low side N-
channel MOSFET conducts, also dissipating power.
Device operating current also reduces efficiency. The
product of the quiescent (operating) current and the
supply voltage represents another DC loss. The current
required driving the gates on and off at a constant 4MHz
frequency and the switching transitions make up the
switching losses.
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.
September 2011
12
M9999-092211-B
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MIC23153YMT | 制造商:Micrel 功能描述:DC DC Converter Single-OUT Step Down |
| MIC23153YMT EV | 功能描述:电源管理IC开发工具 4MHz 2A Buck Switcher with Soft Start and Power Good - Evaluation Board RoHS:否 制造商:Maxim Integrated 产品:Evaluation Kits 类型:Battery Management 工具用于评估:MAX17710GB 输入电压: 输出电压:1.8 V |
| MIC23153YMT TR | 功能描述:直流/直流开关调节器 4MHz 2A Buck Switcher with Soft Start and Power Good 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 |
| MIC23153YMTEV | 制造商:Micrel Inc 功能描述:Evaluation Board for MIC23153YMT |
| MIC23153YMT-EV | 功能描述:MIC23153 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: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:MIC23153 标准包装:1 |
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