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| 型号： | MCP1612-ADJI/MS |
| 厂商： | Microchip Technology |
| 文件页数： | 9/22页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ 1A 8MSOP |
| 标准包装： | 100 |
| 类型： | 降压（降压） |
| 输出类型： | 可调式 |
| 输出数： | 1 |
| 输出电压： | 0.8 V ~ 5 V |
| 输入电压： | 2.7 V ~ 5.5 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 1.4MHz |
| 电流 - 输出： | 1A |
| 同步整流器： | 是 |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-TSSOP，8-MSOP（0.118"，3.00mm 宽） |
| 包装： | 管件 |
| 供应商设备封装： | 8-MSOP |
| 产品目录页面： | 669 (CN2011-ZH PDF) |
MCP1612
3.0
MCP1612 PIN DESCRIPTIONS
TABLE 3-1:
PIN FUNCTION TABLE
Pin No.
1
2
3
4
5
6
7
8
Name
V IN
V CC
SHDN
COMP
FB
A GND
P GND
L X
Input Voltage Pin
Analog Input Voltage Pin
Shutdown Control Input Pin
Transconductance Amplifier Output Pin
Feedback Input Pin
Analog Ground Pin
Power Ground Pin
Buck Inductor Output Pin
Function
3.1
Input Voltage Pin (V IN )
3.5
Feedback Pin (FB)
Connect the input voltage source to V IN . For normal
operation, the voltage on V IN should be between +2.7V
and +5.5V. A 10 μF bypass capacitor should be
connected between V IN and P GND .
Connect the output voltage of the buck converter
through an external resistor divider to FB to regulate
the output voltage. The nominal voltage compared to
this input for pulse termination is 0.8V.
3.2
Analog Input Voltage Pin (V CC )
3.6
Analog Ground Pin (A GND )
V CC provides bias for internal analog functions. This
Tie all small-signal ground returns to A GND . Noise on
voltage is derived by filtering the V IN supply.
A GND
can effect the sensitive internal analog
measurements.
3.3
Shutdown Input Pin (SHDN)
Connect SHDN to a logic-level input in order to turn the
3.7
Power Ground Pin (P GND )
regulator on or off. A logic-high (>45% of V IN ) will
enable the regulator. A logic-low (<15% of V IN ) will
force the regulator into Shutdown mode. When in
shutdown, both the P-channel and N-channel switches
are turned off.
Connect all large-signal ground returns to P GND . These
large-signal traces should have a small loop area and
length to prevent coupling of switching noise to
sensitive traces.
3.4
Compensation Pin (COMP)
3.8 Buck Inductor Output Pin (L X )
Connect L X directly to the buck inductor. This pin
COMP is the internal transconductance amplifier
output pin. External compensation is connected to
COMP for control-loop stabilization.
? 2005 Microchip Technology Inc.
carries large signal-level currents; all connections
should be made as short as possible.
DS21921B-page 9
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