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MIC4685-3.3YR PDF预览

MIC4685-3.3YR

更新时间： 2023-12-18 00:00:00
品牌 Logo 应用领域
美国微芯 - MICROCHIP 开关
页数 文件大小 规格书
15页 2094K
描述
SWITCHING REGULATOR, 225kHz SWITCHING FREQ-MAX, PSSO7

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中文翻译

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MIC4685-3.3YR 技术参数

是否Rohs认证： 符合生命周期：Active
包装说明：,Reach Compliance Code：compliant
ECCN代码：EAR99HTS代码：8542.39.00.01
风险等级：5.6模拟集成电路 - 其他类型：SWITCHING REGULATOR
控制模式：VOLTAGE-MODE控制技术：PULSE WIDTH MODULATION
最大输入电压：30 V最小输入电压：4 V
标称输入电压：12 VJESD-30 代码：R-PSSO-G7
JESD-609代码：e3长度：9.395 mm
湿度敏感等级：3功能数量：1
端子数量：7最高工作温度：125 °C
最低工作温度：-40 °C封装主体材料：PLASTIC/EPOXY
封装形状：RECTANGULAR封装形式：SMALL OUTLINE
峰值回流温度（摄氏度）：260认证状态：Not Qualified
座面最大高度：2.16 mm表面贴装：YES
切换器配置：BUCK最大切换频率：225 kHz
温度等级：AUTOMOTIVE端子面层：Matte Tin (Sn)
端子形式：GULL WING端子节距：1.27 mm
端子位置：SINGLE处于峰值回流温度下的最长时间：40
宽度：8 mmBase Number Matches：1

MIC4685-3.3YR 数据手册

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MIC4685  
Micrel, Inc.  
The efficiency is used to determine how much of the output  
Applications Information  
Adjustable Regulators  
power (P  
) is dissipated in the regulator circuit (P ).  
OUT  
D
P
OUT  
Adjustable regulators require a 1.235V feedback signal.  
Recommended voltage-divider resistor values for common  
output voltages are detailed in Table 1.  
P =  
−
P  
OUT  
D
η
7.5W  
0.84  
P =  
−
7.5W  
For other voltages, the resistor values can be determined  
using the following formulas:  
P = 1.43W  
D
R1  
R2  
V
V
REF  
+
1  
Aworst-case rule of thumb is to assume that 80% of the total  
output power dissipation is in the MIC4685 (P  
is in the diode-inductor-capacitor circuit.  
) and 20%  
D(IC)  
VOUT  
R1
=
R2  
−
1  
P
P
P
= 0.8 P  
D
D(IC)  
D(IC)  
D(IC)  
V
REF  
= 0.8
×
1.43W  
V
1.235V  
= 1.14W  
Calculate the worst-case junction temperature:  
T = P + (T – T ) + T  
Thermal Considerations  
θ
The MIC4685 is capable of high current due to the thermally  
optimized SPAK package.  
J
D(IC) JC  
C
A
A(max)  
where:  
T = MIC4685 junction temperature  
OnelimitationofthemaximumoutputcurrentonanyMIC4685  
design is the junction-to-ambient thermal resistance (θ ) of  
the design (package and ground plane).  
J
JA  
P
= MIC4685 power dissipation  
D(IC)  
θ
= junction-to-case thermal resistance.  
JC  
Examining θ in more detail:  
JA  
θ
= (θ + θ  
)
JA  
JC  
CA  
The θ for the MIC4685’s 7-lead SPAK is approximately  
JC  
where:  
2.2°C/W.  
θ
θ
= junction-to-case thermal resistance  
= case-to-ambient thermal resistance  
T = “pin” temperature measurement taken at the  
JC  
CA  
C
Tab.  
T = ambient temperature  
θ
θ
is a relatively constant 2.2°C/W for a 7-lead SPAK.  
A
JC  
T
= maximum ambient operating temperature  
is dependent upon layout and is primarily governed by  
A(max)  
CA  
for the specific design.  
the connection of pins 4, and Tab to the ground plane. The  
purpose of the ground plane is to function as a heat sink.  
Calculating the maximum junction temperature given a  
maximum ambient temperature of 60°C:  
Checking the Maximum Junction Temperature:  
T = 1.14
×
2.2°C + (46°C – 25°C) + 60°C  
For this example, with an output power (P  
) of 7.5W, (5V  
J
OUT  
output at 1.5A with V = 12V) and 60°C maximum ambient  
temperature, what is the junction temperature?  
T = 83.5°C  
IN  
J
This value is within the allowable maximum operating junc-  
tion temperature of 125°C as listed in “Operating Ratings.”  
Typical thermal shutdown is 160°C and is listed in “Electrical  
Characteristics.” Also refer to the “Typical Safe Operating  
Area (SOA)” graphs in this document.  
Referringtothe“TypicalCharacteristics:5VOutputEfficiency”  
graph, read the efficiency (η) for 1.5A output current at V  
=
IN  
12V or perform you own measurement.  
η = 84%  
M9999-031805  
10  
March 2005  
1...78910111213...15

中文翻译

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