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参数资料
| 型号： | MCP16322T-150E/NG |
| 厂商： | Microchip Technology |
| 文件页数： | 21/34页 |
| 文件大小： | 0K |
| 描述： | IC REG BUCK SYNC 1.5V 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： | 1.5V |
| 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-150E/NGDKR |
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MCP16321/2
5.0.7
BOOST CAPACITOR
EXAMPLE 5-5:
POWER DISSIPATION –
The boost capacitor is used to supply current for the
MCP16321
internal high-side drive circuitry that is above the input
voltage. The boost capacitor must store enough energy
to completely drive the high-side switch on and off. A
22 nF X5R or X7R capacitor is recommended for all
applications. The boost capacitor maximum voltage is
5.5V, so a 6.3V or 10V rated capacitor is
recommended.
5.0.8 THERMAL CALCULATIONS
V IN =
V OUT =
I OUT =
Efficiency =
Total System Dissipation =
L ESR =
P L =
12V
5.0V
1A
92.5%
405 mW
0.04 Ω
40 mW
The MCP16321/2 is available in a 3x3 QFN-16
MCP16321 internal power dissipation estimate:
package. By calculating the power dissipation and
applying the package thermal resistance ( θ JA ), the
junction temperature is estimated. The maximum
continuous junction temperature rating for the
P DIS – P L =
θ JA =
Estimated Junction =
365 mW
38.5°C/W
+14.052°C
MCP16321/2 is +125°C.
To quickly estimate the internal power dissipation for
the switching step-down regulator, an empirical
calculation using measured efficiency can be used.
Given the measured efficiency, the internal power
dissipation is estimated in Equation 5-4 . This power
Note 1: θ JA = 38.5°C/W for a 4-layer FR4 Printed
Circuit Board with a 13.5 in 2 , 1 oz internal
copper ground plane.
2: A smaller ground plane will result in a
larger θ JA temperature rise.
dissipation includes all internal and external
component losses. For a quick internal estimate,
subtract the estimated inductor ESR loss from the P DIS
EXAMPLE 5-6:
POWER DISSIPATION –
MCP16322
V IN = 12V
P DIS = ------------------------------- – ( V OUT × I OUT )
EQUATION 5-4: TOTAL POWER
DISSIPATION ESTIMATE
V OUT × I OUT
Efficency
V OUT =
I OUT =
Efficiency =
Total System Dissipation =
L ESR =
3.3V
2A
87.5%
943 mW
0.04 Ω
The difference between the first term, input power, and
the second term, power delivered, is the total system
power dissipation. The inductor losses are estimated
by P L = I OUT2 x L ESR .
P L = 160 mW
MCP16322 internal power dissipation estimate:
P DIS – P L = 783 mW
θ JA = 38.5°C/W
? 2011 Microchip Technology Inc.
Estimated Junction
=
+30.14°C
DS22285A-page 21
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