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| 型号： | MCP16322T-330E/NG |
| 厂商： | Microchip Technology |
| 文件页数： | 19/34页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC 3.3V 2A 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： | 3.3V |
| 输入电压： | 6 V ~ 24 V |
| PWM 型： | 电流模式 |
| 频率 - 开关： | 1MHz |
| 电流 - 输出： | 2A |
| 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： | MCP16322T-330E/NGDKR |
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MCP16321/2
5.0
APPLICATION INFORMATION
5.0.3
GENERAL DESIGN EQUATIONS
5.0.1
TYPICAL APPLICATIONS
The step-down converter duty cycle can be estimated
using Equation 5-2 while operating in Continuous
The MCP16321/2 synchronous step-down converter
operates over a wide input range, up to 24V maximum.
Typical applications include generating a bias or V DD
voltage for PIC ? microcontrollers, digital control system
bias supply for AC-DC converters and 12V industrial
input and similar applications.
Inductor Current Mode. This equation accounts for the
forward drop of two internal N-Channel MOSFETS. As
load current increases, the voltage drop in both internal
switches will increase, requiring a larger PWM duty
cycle to maintain the output voltage regulation. Switch
voltage drop is estimated by multiplying the switch
5.0.2
ADJUSTABLE OUTPUT VOLTAGE
current times the switch resistance or R DSON .
CALCULATIONS
EQUATION 5-2:
CONTINUOUS INDUCTOR
V IN – ( I HSW × R DSONH )
To calculate the resistor divider values for the
R TOP is connected to V OUT , R BOT is connected to
SGND, and both are connected to the V FB input pin.
CURRENT DUTY CYCLE
V OUT + ( I LSW × R DSONL )
D = -------------------------------------------------------------
EQUATION 5-1:
RESISTOR DIVIDER
5.0.4
INPUT CAPACITOR SELECTION
V OUT = V FB × ? ? ? ?
CALCULATION
R TOP
1 + ------------
R BOT
The step-down converter input capacitor must filter the
high-input ripple current, as a result of pulsing or
chopping the input voltage. The MCP16321/2 input
voltage pin is used to supply voltage for the power train
and as a source for internal bias. A low equivalent
EXAMPLE 5-1:
2.0V RESISTOR DIVIDER
series resistance (ESR), preferably a ceramic
capacitor, is recommended. The necessary
V OUT = 2.0V
V FB = 0.9V
R BOT = 10 k Ω
R TOP = 12.2 k Ω (standard value = 12.3 k Ω )
V OUT = 2.007V (using standard values)
capacitance is dependent upon the maximum load
current and source impedance. Three capacitor
parameters to keep in mind are the voltage rating,
equivalent series resistance and the temperature
rating. For wide temperature range applications, a
multilayer X7R dielectric is recommended, while for
applications with limited temperature range, a
EXAMPLE 5-2:
4.2V RESISTOR DIVIDER
multilayer X5R dielectric is acceptable. The input
capacitor voltage rating must be V IN plus margin.
V OUT = 4.2V
V FB = 0.9V
R BOT = 10 k Ω
R TOP = 36.7 k Ω (standard value = 36.5 k Ω )
V OUT = 4.185V (using standard values)
The error amplifier is internally compensated to ensure
loop stability. External resistor dividers, inductance and
output capacitance, all have an impact on the control
system and should be selected carefully and evaluated
for stability. A 10 k ? resistor is recommended as a
good trade-off for quiescent current and noise
immunity.
5.0.5 OUTPUT CAPACITOR SELECTION
The output capacitor provides a stable output voltage
during sudden load transients, and reduces the output
voltage ripple. As with the input capacitor, X5R and
X7R ceramic capacitors are well suited for this applica-
tion.
The MCP16321/2 is internally compensated, so the
put capacitor range.
The amount and type of output capacitance and
equivalent series resistance will have a significant
effect on the output ripple voltage and system stability.
The range of the output capacitance is limited due to
the integrated compensation of the MCP16321/2.
The output voltage capacitor rating should be a
minimum of V OUT plus margin.
TABLE 5-1:
CAPACITOR VALUE RANGE
? 2011 Microchip Technology Inc.
Parameter
C IN
Min
8 μF
Max
None
DS22285A-page 19
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