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| 型号： | MCP16321T-180E/NG |
| 厂商： | Microchip Technology |
| 文件页数： | 17/34页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC 1.8V 1A 16-VQFN |
| 标准包装： | 1 |
| 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： | 6 V ~ 24 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 1MHz |
| 电流 - 输出： | 1A |
| 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： | 16-VFQFN 裸露焊盘 |
| 包装： | 标准包装 |
| 供应商设备封装： | 16-QFN（3x3） |
| 其它名称： | MCP16321T-180E/NGDKR |
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MCP16321/2
4.2
Functional Description
L
V OUT
4.2.1
STEP-DOWN OR BUCK
CONVERTER
S 1
I L
The MCP16321/2 is a synchronous, step-down or buck
converter capable of stepping input voltages ranging
from 6V to 24V down to 0.9V to 5V.
V IN
S 2
C OUT
The integrated high-side switch is used to chop or
modulate the input voltage using a controlled duty cycle
for output voltage regulation. The integrated low-side
switch is used to freewheel current when the high-side
switch is turned off. High efficiency is achieved by using
low-resistance switches and low equivalent series
resistance (ESR), inductor and capacitors. When the
high-side switch is turned on, a DC voltage is applied to
the inductor (V IN – V OUT ), resulting in a positive linear
ramp of inductor current. When the high-side switch
turns off and the low-side switch turns on, the applied
inductor voltage is equal to –V OUT , resulting in a
negative linear ramp of inductor current. In order to
ensure there is no shoot-through current, a dead time
I L
SW
V IN
I OUT
V OUT
where both switches are off is implemented between
the high-side switch turning off and the low-side switch
turning on, and the low-side switch turning off and the
high-side switch turning on.
For steady-state, continuous inductor current
operation, the positive inductor current ramp must
equal the negative current ramp in magnitude. While
I L
S 1 ON
S 2 ON
Continuous Inductor Current Mode
S 1 ON S 2
operating in steady state, the switch duty cycle must be
equal to the relationship of V OUT /V IN for constant
output voltage regulation, under the condition that the
inductor current is continuous, or never reaches zero.
For discontinuous inductor current operation, the
steady-state duty cycle will be less than V OUT /V IN to
maintain voltage regulation. When the inductor current
reaches zero, the low-side switch is turned off so that
current does not flow in the reverse direction, keeping
SW
V IN
Both
ON OFF
Discontinuous Inductor Current Mode
I OUT
the efficiency high. The average of the chopped input
voltage or SW node voltage is equal to the output
voltage, while the average inductor current is equal to
the output current.
? 2011 Microchip Technology Inc.
FIGURE 4-2:
Converter.
Synchronous Step-Down
DS22285A-page 17
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MCP16321T-180NG | 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:24V Input, 1A/2A Output, High Efficiency Synchronous Buck Regulator with Power Good Indication |
| MCP16321T-250E | 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:24V Input, 1A/2A Output, High Efficiency Synchronous Buck Regulator with Power Good Indication |
| MCP16321T-250E/MG | 制造商:Microchip Technology Inc 功能描述:1A SYNCHROUNS BUCK SWITCHER, 24VIN - Tape and Reel |
| MCP16321T-250E/NG | 功能描述:开关变换器、稳压器与控制器 1A Synchrouns Buck 2.5V Switcher, 24Vin RoHS:否 制造商:Texas Instruments 输出电压:1.2 V to 10 V 输出电流:300 mA 输出功率: 输入电压:3 V to 17 V 开关频率:1 MHz 工作温度范围: 安装风格:SMD/SMT 封装 / 箱体:WSON-8 封装:Reel |
| MCP16321T-250NG | 制造商:MICROCHIP 制造商全称:Microchip Technology 功能描述:24V Input, 1A/2A Output, High Efficiency Synchronous Buck Regulator with Power Good Indication |
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