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MIC4685YR

更新时间： 2024-01-26 02:03:40
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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MIC4685YR 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：5.17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

MIC4685YR 数据手册

 浏览型号MIC4685YR的Datasheet PDF文件第6页浏览型号MIC4685YR的Datasheet PDF文件第7页浏览型号MIC4685YR的Datasheet PDF文件第8页浏览型号MIC4685YR的Datasheet PDF文件第10页浏览型号MIC4685YR的Datasheet PDF文件第11页浏览型号MIC4685YR的Datasheet PDF文件第12页 
MIC4685  
Micrel, Inc.  
Block Diagrams  
VIN  
IN  
VIN  
IN  
Bootstrap  
Charger  
Bootstrap  
Charger  
Enable  
Enable  
Internal  
Regulator  
Internal  
Regulator  
R1  
R2  
VOUT VREF  
+1  
1
VOUT  
R1 R2  
VREF  
200kHz  
Oscillator  
Thermal  
Shutdown  
Current  
Limit  
200kHz  
Oscillator  
Thermal  
Shutdown  
Current  
Limit  
V
REF  
1.235V  
Com  
parator  
Com  
parator  
VOUT  
COUT  
VOUT  
COUT  
SW  
FB  
SW  
FB  
Driver  
Driver  
Reset  
Reset  
R1  
R2  
Error  
Amp  
Error  
Amp  
1.235V  
1.235V  
Bandgap  
Bandgap  
Reference  
Reference  
MIC4685  
MIC4685  
Figure 1. Adjustable Regulator  
Figure 2. Fixed Regulator  
waveform to produce a voltage controlled variable duty cycle  
output.  
Functional Description  
The MIC4685 is a variable duty cycle switch-mode regula-  
tor with an internal power switch. Refer to the above block  
diagram.  
Ahigherfeedbackvoltageincreasestheerroramplifieroutput  
voltage. A higher error amplifier voltage (comparator invert-  
ing input) causes the comparator to detect only the peaks  
of the sawtooth, reducing the duty cycle of the comparator  
output. A lower feedback voltage increases the duty cycle.  
The MIC4685 uses a voltage-mode control architecture.  
Supply Voltage  
The MIC4685 operates from a +4V to +30V (34V transient)  
unregulated input. Highest efficiency operation is from a  
supply voltage around +12V. See the efficiency curves in the  
“Typical Characteristics” section on page 5.  
Output Switching  
When the internal switch is ON, an increasing current flows  
Enable/Shutdown  
from the supply V through external storage inductor L1, to  
IN,  
The enable (
EN
) input is TTL compatible. Tie the input high  
if unused. A logic-high enables the regulator. A logic-low  
shuts down the internal regulator which reduces the current  
output capacitor C  
and the load. Energy is stored in the  
OUT  
inductor as the current increases with time.  
When the internal switch is turned OFF, the collapse of the  
magneticfieldinL1forcescurrenttoflowthroughfastrecovery  
to typically 150µA when V = 0V.  
EN  
Feedback  
diode D1, charging C  
OUT  
In the fixed version, the feedback pin is connected directly  
to the output. In the adjustable version, an external resistive  
voltage divider is required from the output voltage to ground,  
center tapped to the FB pin. See Table 1 and Table 2 for  
recommended resistor values.  
Output Capacitor  
External output capacitor C  
reduces ripple.  
provides stabilization and  
OUT  
Return Paths  
During the ON portion of the cycle, the output capacitor and  
load currents return to the supply ground. During the OFF  
portion of the cycle, current is being supplied to the output  
capacitor and load by storage inductor L1, which means that  
D1 is part of the high-current return path.  
Duty Cycle Control  
A fixed-gain error amplifier compares the feedback signal  
with a 1.235V bandgap voltage reference. The resulting error  
amplifier output voltage is compared to a 200kHz sawtooth  
March 2005  
9
M9999-031805  
1...6789101112...15

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