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| 型号： | MCP1612T-ADJI/MS |
| 厂商： | Microchip Technology |
| 文件页数： | 11/22页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC ADJ 1A 8MSOP |
| 标准包装： | 2,500 |
| 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： | 带卷 (TR) |
| 供应商设备封装： | 8-MSOP |
MCP1612
5.0
APPLICATION CIRCUITS/INFORMATION
MCP1612 3.3V to 1.2V Synchronous Buck Converter
3.3V IN ±10%
C IN
10 μF
Ceramic
ON
C BYP
0.1 μF
Ceramic
10 Ω
1
2
3
V IN
V CC
SHDN
MCP1612
L x
P GND
A GND
8 L = 3.3 μH
7
6
1.2V V OUT @ 1A
C OUT
10 μF 100 k Ω
Ceramic
200 k Ω
OFF
4
Comp
FB
5
25 k Ω
1000 pF
FIGURE 5-1:
Typical Application Circuit.
5.1
Typical Applications
resistors will make the circuit more susceptible to noise
R 1 = R 2 × ? ------------- – 1 ?
? V FB
The MCP1612 buck controller can be used in several
different applications where a voltage that is lower than
the supply voltage is required. Its small size, low cost
and high efficiency make the MCP1612 a good choice
for densely-packaged applications. The input voltage
range, low-dropout voltage and low shutdown current
make this part perfectly suited for battery-powered
applications.
on the FB pin. Lower-value resistors can be used, if
necessary.
shown below.
EQUATION 5-1:
V OUT
?
5.2
Design Example
Where:
The step-by-step design of a buck converter with the
following parameters is presented to illustrate how
easy the MCP1612 is to use.
Input voltage = 3.3V
Output voltage = 1.2V
Output current = 0A to 1A
Switching frequency = 1.4 MHz
V OUT = desired output voltage
V FB = MCP1612 internal reference
voltage
R 1 = top resistor value
R 2 = bottom resistor value
For this example:
V OUT = 1.2V
5.2.1
SETTING OUTPUT VOLTAGE
V FB = 0.8V
The output voltage of the MCP1612 is set by using an
external resistor-divider network. The voltage present
at FB is internally compared to a 0.8V reference
voltage. A 200 k Ω resistor is recommended for R 2 , the
lower-end of the voltage divider. Using higher-value
? 2005 Microchip Technology Inc.
R 2 = 200 k Ω
R 1 = 100 k Ω
The MCP1612 is capable of a 15% duty cycle.
Instability may result when the duty cycle is below 15%.
If less than 15% duty cycle operation is needed, care
must be taken to ensure stable operation.
DS21921B-page 11
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