参数资料
| 型号： | MIC2169BYMME |
| 厂商： | Micrel Inc |
| 文件页数： | 17/25页 |
| 文件大小： | 0K |
| 描述： | IC REG CTRLR BUCK PWM VM 10-MSOP |
| 特色产品： | MIC2169B Buck Control IC |
| 标准包装： | 100 |
| PWM 型： | 电压模式 |
| 输出数： | 1 |
| 频率 - 最大： | 550kHz |
| 占空比： | 92% |
| 电源电压： | 3 V ~ 14.5 V |
| 降压： | 是 |
| 升压： | 无 |
| 回扫： | 无 |
| 反相： | 无 |
| 倍增器： | 无 |
| 除法器： | 无 |
| Cuk： | 无 |
| 隔离： | 无 |
| 工作温度： | -40°C ~ 85°C |
| 封装/外壳： | 10-TFSOP，10-MSOP（0.118"，3.00mm 宽）裸露焊盘 |
| 包装： | 管件 |
| 产品目录页面： | 1092 (CN2011-ZH PDF) |
| 其它名称： | 576-3545-5 |
Micrel, Inc.
Figure 17. MIC2169B Startup with Pre-Bias Support,
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MIC2169B
Keep both the V IN and power GND connections
short.
Place several vias to the ground plane close to the
V IN input capacitor ground terminal.
Use either X7R or X5R dielectric input capacitors.
Do not use Y5V or Z5U type capacitors.
Do not replace the ceramic input capacitor with any
other type of capacitor. Any type of capacitor can be
placed in parallel with the input capacitor.
If a Tantalum input capacitor is placed in parallel
with the input capacitor, it must be recommended for
switching regulator applications and the operating
voltage must be derated by 50%.
In “Hot-Plug” applications, a Tantalum or Electrolytic
bypass capacitor must be used to limit the over-
voltage spike seen on the input supply with power is
suddenly applied.
An additional Tantalum or Electrolytic bypass input
capacitor of 22uF or higher is required at the input
power connection.
Pre-Bias At 90% of V OUT_FINAL
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Use a 5 ? resistor from the input supply to the V DD
pin on the MIC2169B. Also, place a 1μF ceramic
Figure 17 shows MIC2169B startup with a pre-bias of
2.2V on the output (90% of V OUT ) without the pre-existing
output voltage discharge.
Design and PCB Layout Guideline
WARNING!!! TO MINIMIZE EMI AND OUTPUT NOISE,
capacitor from this pin to GND, preferably not
through a via. The capacitor must be located right at
the IC. The V dd terminal is very noise sensitive and
placement of the capacitor is very critical.
Connections must be made with wide trace.
Inductor
FOLLOW THESE LAYOUT RECOMMENDATIONS:
PCB Layout is critical to achieve reliable, stable and
efficient performance. A ground plane is required to
control EMI and minimize the inductance in power,
signal and return paths.
The following guidelines should be followed to insure
proper operation of the MIC2169B converter.
IC
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Keep the inductor connection to the switch node
(SW) short.
Do not route any digital lines underneath or close to
the inductor.
Keep the switch node (SW) away from the feedback
(FB) pin.
To minimize noise, place a ground plane underneath
the inductor.
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Place the IC and MOSFETs close to the point of
load (POL).
Use fat traces to route the input and output power
lines.
Output Capacitor
? Use a wide trace to connect the output capacitor
ground terminal to the input capacitor ground
terminal.
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Signal and power grounds should be kept separate
and connected at only one location.
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Phase margin will change as the output capacitor
value and ESR changes. Contact the factory if the
Input Capacitor
? Place the V IN input capacitor next.
? Place the V IN input capacitors on the same side of
the board and as close to the MOSFETs as
possible.
April 2010
17
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output capacitor is different from what is shown in
the BOM.
The feedback trace should be separate from the
power trace and connected as close as possible to
the output capacitor. Sensing a long high-current
load trace can degrade the DC load regulation.
M9999-041210-B
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相关代理商/技术参数 |
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| MIC2169BYMME TR | 功能描述:直流/直流开关转换器 Synchronous Step Down Converter RoHS:否 制造商:STMicroelectronics 最大输入电压:4.5 V 开关频率:1.5 MHz 输出电压:4.6 V 输出电流:250 mA 输出端数量:2 最大工作温度:+ 85 C 安装风格:SMD/SMT |
| MIC2169MM | 制造商:MICREL 制造商全称:Micrel Semiconductor 功能描述:500 KHZ PWM SYNCHRONOUS BUCK CONTROL IC |
| MIC2169YMM | 功能描述:直流/直流开关调节器 Replaced by MIC2169AYMM (Lead Free) 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 |
| MIC2169YMM TR | 功能描述:直流/直流开关调节器 Replaced by MIC2169AYMM TR (Lead Free) 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 |
| MIC2171 | 制造商:MICREL 制造商全称:Micrel Semiconductor 功能描述:100kHz 2.5A Switching Regulator Preliminary Information |
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