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MP4350

更新时间： 2024-02-02 23:57:48
品牌 Logo 应用领域
芯源 - MPS 转换器
页数 文件大小 规格书
14页 455K
描述
2.5A, 4MHz, 20V Step-Down Converter

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MP4350 技术参数

是否无铅： 含铅是否Rohs认证： 不符合
生命周期：Not Recommended零件包装代码：SON
包装说明：HVSON,针数：10
Reach Compliance Code：compliantECCN代码：EAR99
HTS代码：8542.39.00.01风险等级：5.18
模拟集成电路 - 其他类型：SWITCHING REGULATOR控制模式：CURRENT-MODE
控制技术：PULSE WIDTH MODULATION最大输入电压：20 V
最小输入电压：4.5 V标称输入电压：12 V
JESD-30 代码：S-XDSO-N10长度：3 mm
功能数量：1端子数量：10
最高工作温度：85 °C最低工作温度：-40 °C
最大输出电流：3.5 A封装主体材料：UNSPECIFIED
封装代码：HVSON封装形状：SQUARE
封装形式：SMALL OUTLINE, HEAT SINK/SLUG, VERY THIN PROFILE峰值回流温度（摄氏度）：NOT SPECIFIED
认证状态：Not Qualified座面最大高度：1 mm
表面贴装：YES切换器配置：BUCK
最大切换频率：4800 kHz温度等级：INDUSTRIAL
端子形式：NO LEAD端子节距：0.5 mm
端子位置：DUAL处于峰值回流温度下的最长时间：NOT SPECIFIED
宽度：3 mmBase Number Matches：1

MP4350 数据手册

 浏览型号MP4350的Datasheet PDF文件第4页浏览型号MP4350的Datasheet PDF文件第5页浏览型号MP4350的Datasheet PDF文件第6页浏览型号MP4350的Datasheet PDF文件第8页浏览型号MP4350的Datasheet PDF文件第9页浏览型号MP4350的Datasheet PDF文件第10页 
MP4350 – 2.5A, 4MHz, 20V STEP-DOWN CONVERTER  
The bootstrap capacitor is charged and  
regulated to about 5V by the dedicated internal  
bootstrap regulator. When the voltage between  
the BST and SW nodes is lower than its  
regulation, a PMOS pass transistor connected  
from VIN to BST is turned on. The charging  
current path is from VIN, BST and then to SW.  
External circuit should provide enough voltage  
headroom to facilitate the charging.  
Current Comparator and Current Limit  
The power MOSFET current is accurately  
sensed via a current sense MOSFET. It is then  
fed to the high speed current comparator for the  
current mode control purpose. The current  
comparator takes this sensed current as one of  
its inputs. When the power MOSFET is turned  
on, the comparator is first blanked till the end of  
the turn-on transition to avoid noise issues. The  
comparator then compares the power switch  
current with the COMP voltage. When the  
sensed current is higher than the COMP  
voltage, the comparator output is low, turning  
off the power MOSFET. The cycle-by-cycle  
maximum current of the internal power  
MOSFET is internally limited.  
As long as VIN is sufficiently higher than SW,  
the bootstrap capacitor can be charged. When  
the power MOSFET is ON, VIN is about equal  
to SW so the bootstrap capacitor cannot be  
charged. When the external diode is on, the  
difference between VIN and SW is largest, thus  
making it the best period to charge. When there  
is no current in the inductor, SW equals the  
output voltage VOUT so the difference between  
VIN and VOUT can be used to charge the  
bootstrap capacitor.  
Startup and Shutdown  
If both VIN and EN are higher than their  
appropriate thresholds, the chip starts. The  
reference block starts first, generating stable  
reference voltage and currents, and then the  
internal regulator is enabled. The regulator  
provides stable supply for the remaining  
circuitries.  
At higher duty cycle operation condition, the  
time period available to the bootstrap charging  
is less so the bootstrap capacitor may not be  
sufficiently charged.  
While the internal supply rail is up, an internal  
timer holds the power MOSFET OFF for about  
50µs to blank the startup glitches. When the  
internal soft-start block is enabled, it first holds  
its SS output low to ensure the remaining  
circuitries are ready and then slowly ramps up.  
In case the internal circuit does not have  
sufficient voltage and the bootstrap capacitor is  
not charged, extra external circuitry can be  
used to ensure the bootstrap voltage is in the  
normal operational region. Refer to External  
Bootstrap Diode in Application section.  
Three events can shut down the chip: EN low,  
VIN low and thermal shutdown. In the shutdown  
procedure, the power MOSFET is turned off  
first to avoid any fault triggering. The COMP  
voltage and the internal supply rail are then  
pulled down.  
The DC quiescent current of the floating driver  
is about 20µA. Make sure the bleeding current  
at the SW node is higher than this value, such  
that:  
VO  
IO  
+
> 20µA  
(R1+ R2)  
Programmable Oscillator  
The MP4350 oscillating frequency is set by an  
external resistor, Rfreq from the FREQ pin to  
ground. The value of Rfreq can be calculated  
from:  
180000  
fs(KHz)1.1  
Rfreq(KΩ) =  
MP4350 Rev. 1.0  
5/26/2008  
www.MonolithicPower.com  
MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.  
© 2008 MPS. All Rights Reserved.  
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