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参数资料
| 型号： | MIC3172YM TR |
| 厂商： | Micrel Inc |
| 文件页数： | 3/20页 |
| 文件大小： | 0K |
| 描述： | IC REG MULTI CONFIG 1.25A 8SOIC |
| 标准包装： | 2,500 |
| 类型： | 降压（降压），升压（升压），反相，Cuk |
| 输出数： | 1 |
| 输入电压： | 3 V ~ 40 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 100kHz |
| 电流 - 输出： | 1.25A |
| 同步整流器： | 无 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 包装： | 带卷 (TR) |
| 供应商设备封装： | 8-SOIC |
| 其它名称： | MIC3172YMTR MIC3172YMTR-ND |
Micrel
Pin Description
MIC2172/3172
Pin Number
1
2
3
4 (MIC2172)
4 (MIC3172)
5
6
7
8
Pin Name
S GND
COMP
FB
SYNC
EN
VIN
P GND 2
VSW
P GND 1
Pin Function
Signal Ground: Internal analog circuit ground. Connect directly to the input filter
capacitor for proper operation (see applications info). Keep separate from power
grounds.
Frequency Compensation: Output of transconductance type error amplifier.
Primary function is for loop stabilization. Can also be used for output voltage
soft-start and current limit tailoring.
Feedback: Inverting input of error amplifier. Connect to external resistive divider
to set power supply output voltage.
Synchronization/Frequency Adjust: Capacitively coupled input signal greater
than device’s free running frequency (up to 135kHz) will lock device’s oscillator
on falling edge. Oscillator frequency can be trimmed up to 135kHz by adding a
resistor to ground. If unused, pin must float (no connection).
Enable: Apply TTL high or connect to V IN to enable the regulator. Apply TTL low
or connect to ground to disable the regulator. Device draws only leakage current
(<1μA) when disabled.
Supply Voltage: 3.0V to 40V
Power Ground #2: One of two NPN power switch emitters with 0.3 ? current
sense resistor in series. Required. Connect to external inductor or input voltage
ground depending on circuit topology.
Power Switch Collector: Collector of NPN switch. Connect to external inductor or
input voltage depending on circuit topology.
Power Ground #1: One of two NPN power switch emitters with 0.3 ? current
sense resistor in series. Optional. For maximum power capability connect to P
GND 2. Floating pin reduces current limit by a factor of two.
April 2006
3
M9999-041806
(408) 955-1690
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| MIC3172YN | 功能描述:直流/直流开关调节器 1.25A 100kHz Switching Regulator (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 |
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