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参数资料
| 型号： | MIC23155-GYMT TR |
| 厂商： | Micrel Inc |
| 文件页数： | 12/19页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC 1.8V 2A 10TMLF |
| 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： | 3MHz |
| 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： | 576-3970-6 |
Micrel Inc.
Application Information
The MIC23155 is a high performance DC/DC step-down
MIC23155
Peak current can be calculated in Equation 2:
I PEAK = ? I OUT + V OUT ? ?
? 2 × f × L
? ? ?
regulator offering a small solution size. Supporting an
output current up to 2A in a tiny 2.5mm x 2.5mm Thin
DFN package, the IC requires only four external
components while meeting today’s miniature portable
? ? 1 ? V OUT /V IN
?
? ?
? ?
Eq. 2
electronic device needs. Using the HyperLight Load
switching scheme, the MIC23155 is able to maintain
high efficiency throughout the entire load range while
providing ultra fast load transient response. The
following sections provide additional device application
information.
Input Capacitor
A 2.2μF ceramic capacitor or greater should be placed
close to the VIN pin and PGND pin for bypassing. A
Murata GRM188R60J475ME84D, size 0603, 4.7μF
ceramic capacitor is recommended based upon
performance, size and cost. A X5R or X7R temperature
rating is recommended for the input capacitor.
Output Capacitor
The MIC23155 is designed for use with a 2.2μF or
greater ceramic output capacitor. Increasing the output
capacitance will lower output ripple and improve load
transient response but could also increase solution size
or cost. A low equivalent series resistance (ESR)
As shown by the calculation above, the peak inductor
current is inversely proportional to the switching
frequency and the inductance. The lower the switching
frequency or inductance, the higher the peak current. As
input voltage increases, the peak current also increases.
The size of the inductor depends on the requirements of
the application. Refer to the typical application circuit
and Bill of Materials for details.
DC resistance (DCR) is also important. While DCR is
inversely proportional to size, DCR can represent a
significant efficiency loss. Refer to the “Efficiency
Considerations” subsection.
The transition between continuous conduction code
(CCM) to HyperLight Load mode is determined by the
inductor ripple current and the load current.
ceramic output capacitor such as the
Murata
GRM188R60J475ME84D, size 0603, 4.7μF ceramic
capacitor is recommended based upon performance,
size and cost. Both the X7R or X5R temperature rating
capacitors are recommended.
Inductor Selection
When selecting an inductor, it is important to consider
the following factors:
?
?
Inductance
Rated current value
?
?
Size requirements
DC resistance (DCR)
Figure 3. Transition between CCM Mode to HLL Mode
Figure 3 illustrates the signals for high-side switch drive
(HSD) for T ON control, the Inductor current, and the low-
The MIC23155 is designed for use with a 0.47μH to
2.2μH inductor. For faster transient response, a 0.47μH
inductor will yield the best result. For lower output ripple,
a 2.2μH inductor is recommended.
Maximum current ratings of the inductor are generally
given in two methods; permissible DC current, and
saturation current. Permissible DC current can be rated
either for a 40°C temperature rise or a 10% to 20% loss
in inductance. Ensure the inductor selected can handle
the maximum operating current. When saturation current
is specified, make sure that there is enough margin so
that the peak current does not cause the inductor to
saturate.
side switch drive (LSD) for T OFF control.
In HLL mode, the inductor is charged with a fixed Ton
pulse on the high side switch. After this, the low side
switch is turned 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 the
threshold, the part is in CCM mode.
November 2012
12
M9999-110812-A
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MIC23155YMT TR | 功能描述:直流/直流开关调节器 3MHz PWM 2A Buck Switcher with HyperLight Load and Power Good in a 2.5mm x 2.5mm Thin MLF 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 |
| MIC23155YMTTR | 制造商:Micrel 功能描述:DC DC Step Down Adj 1.8V 2A 10 Pin TMLF |
| MIC23155YMT-TR | 功能描述:Buck Switching Regulator IC Positive Adjustable 0.7V 1 Output 2A 10-UFDFN Exposed Pad, 10-TMLF? 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）:4.4V 电流 - 输出:2A 频率 - 开关:3MHz 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-UFDFN 裸露焊盘，10-TMLF? 供应商器件封装:10-TMLF?（2.5x2.5） 标准包装:1 |
| MIC23156-0YCS TR | 制造商:Micrel Inc 功能描述:IC REG BUCK ADJ 1.5A 16WLCSP |
| MIC23156-0YCS-EV | 功能描述:MIC23156 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:0.8V 或 1V 电流 - 输出:1.5A 电压 - 输入:2.7 V ~ 5.5 V 稳压器拓扑:降压 频率 - 开关:3MHz 板类型:完全填充 所含物品:板 使用的 IC/零件:MIC23156 标准包装:1 |
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