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MP4350DQ-Z PDF预览

MP4350DQ-Z

更新时间： 2024-02-24 18:27:42
品牌 Logo 应用领域
芯源 - MPS 开关
页数 文件大小 规格书
14页 449K
描述
Switching Regulator, Current-mode, 3.5A, 4800kHz Switching Freq-Max, 3 X 3 MM, MO-229VEED-5, QFN-10

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MP4350DQ-Z 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

MP4350DQ-Z 数据手册

 浏览型号MP4350DQ-Z的Datasheet PDF文件第3页浏览型号MP4350DQ-Z的Datasheet PDF文件第4页浏览型号MP4350DQ-Z的Datasheet PDF文件第5页浏览型号MP4350DQ-Z的Datasheet PDF文件第7页浏览型号MP4350DQ-Z的Datasheet PDF文件第8页浏览型号MP4350DQ-Z的Datasheet PDF文件第9页 
MP4350 – 2.5A, 4MHz, 20V STEP-DOWN CONVERTER  
Error Amplifier  
Under-Voltage Lockout (UVLO)  
The error amplifier compares the FB pin voltage  
with the internal reference (REF) and outputs a  
current proportional to the difference between  
the two. This output current is then used to  
charge the external compensation network to  
form the COMP voltage, which is used to  
control the power MOSFET current.  
Under-voltage lockout (UVLO) is implemented  
to protect the chip from operating at insufficient  
supply voltage. The UVLO rising threshold is  
about 3.0V while its falling threshold is a  
consistent 2.6V.  
Internal Soft-Start  
The soft-start is implemented to prevent the  
converter output voltage from overshooting  
during startup. When the chip starts, the  
internal circuitry generates a soft-start voltage  
(SS) ramping up from 0V to 2.6V. When it is  
lower than the internal reference (REF), SS  
overrides REF so the error amplifier uses SS as  
the reference. When SS is higher than REF,  
REF regains control.  
During operation, the minimum COMP voltage  
is clamped to 0.9V and its maximum is clamped  
to 2.0V. COMP is internally pulled down to GND  
in shutdown mode. COMP should not be pulled  
up beyond 2.6V.  
Internal Regulator  
Most of the internal circuitries are powered from  
the 2.6V internal regulator. This regulator takes  
the VIN input and operates in the full VIN range.  
When VIN is greater than 3.0V, the output of  
the regulator is in full regulation. When VIN is  
lower than 3.0V, the output decreases.  
Thermal Shutdown  
Thermal shutdown is implemented to prevent  
the chip from operating at exceedingly high  
temperatures. When the silicon die temperature  
is higher than its upper threshold, it shuts down  
the whole chip. When the temperature is lower  
than its lower threshold, the chip is enabled  
again.  
Enable Control  
The MP4350 has a dedicated enable control pin  
(EN). With high enough input voltage, the chip  
can be enabled and disabled by EN, which has  
positive logic. Its falling threshold is a precision  
1.2V, and its rising threshold is 1.5V (300mV  
higher).  
Floating Driver and Bootstrap Charging  
The floating power MOSFET driver is powered  
by an external bootstrap capacitor. This floating  
driver has its own UVLO protection. This  
UVLO’s rising threshold is 2.2V with a threshold  
of 150mV.  
When floating, EN is pulled up to about 3.0V by  
an internal 1µA current source so it is enabled.  
To pull it down, 1µA current capability is needed.  
When EN is pulled down below 1.2V, the chip is  
put into the lowest shutdown current mode.  
When EN is higher than zero but lower than its  
rising threshold, the chip is still in shutdown  
mode but the shutdown current increases  
slightly.  
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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