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MIC4685WRTR

更新时间： 2024-02-01 22:18:37
品牌 Logo 应用领域
麦瑞 - MICREL 开关
页数 文件大小 规格书
17页 331K
描述
SWITCHING REGULATOR, 225kHz SWITCHING FREQ-MAX, PSSO7, ROHS COMPLIANT, SPAK-7

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MIC4685WRTR 技术参数

是否无铅： 不含铅是否Rohs认证： 符合
生命周期：Transferred零件包装代码：MODULE
包装说明：,针数：7
Reach Compliance Code：compliantECCN代码：EAR99
HTS代码：8542.39.00.01风险等级：5.15
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 V
JESD-30 代码：R-PSSO-G7JESD-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：2.03 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 mm
Base Number Matches：1

MIC4685WRTR 数据手册

 浏览型号MIC4685WRTR的Datasheet PDF文件第7页浏览型号MIC4685WRTR的Datasheet PDF文件第8页浏览型号MIC4685WRTR的Datasheet PDF文件第9页浏览型号MIC4685WRTR的Datasheet PDF文件第11页浏览型号MIC4685WRTR的Datasheet PDF文件第12页浏览型号MIC4685WRTR的Datasheet PDF文件第13页 
Micrel, Inc.  
MIC4685  
Functional Diagram  
VIN  
IN  
Bootstrap  
Charger  
Enable  
Internal  
Regulator  
R1  
R2  
⎛
⎜
⎝
⎞
⎟
VOUT = VREF  
+1  
⎠
⎛ VOUT  
⎞
R1= R2  
–1  
⎟
200kHz  
Oscillator  
Thermal  
Shutdown  
Current  
Limit  
⎜
V
⎝
⎠
REF  
VREF = 1.235V  
Com-  
parator  
VOUT  
COUT  
SW  
FB  
Driver  
Reset  
R1  
R2  
Error  
Amp  
1.235V  
Bandgap  
Reference  
MIC4685  
Figure 1. Adjustable Regulator  
A higher feedback voltage increases the error amplifier  
output voltage. higher error amplifier voltage  
Functional Description  
The MIC4685 is a variable duty cycle switch-mode  
regulator with an internal power switch. Refer to the  
above block diagram.  
A
(comparator inverting 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 from the supply VIN, through external storage  
inductor L1, to output capacitor COUT and the load.  
Energy is stored in the inductor as the current increases  
with time.  
Enable/Shutdown  
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 to typically 150µA when VEN = 0V.  
When the internal switch is turned OFF, the collapse of  
the magnetic field in L1 forces current to flow through  
fast recovery diode D1, charging COUT  
.
Feedback  
Output Capacitor  
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.  
External output capacitor COUT provides stabilization and  
reduces ripple.  
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 waveform to produce a voltage  
controlled variable duty cycle output.  
M9999-012610  
January 2010  
10  
1...78910111213...17

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