Datasheet > MPQ4458DQT-Z-LF

MPQ4458DQT-Z-LF

更新时间： 2024-01-13 00:55:16

品牌	Logo	应用领域
芯源 - MPS		开关光电二极管
页数	文件大小	规格书
14页	385K
描述
Switching Regulator, Current-mode, 4900kHz Switching Freq-Max, PDSO10, 3 X 3 MM, ROHS COMPLIANT, MO-229VEED-5, TQFN-10

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MPQ4458DQT-Z-LF 技术参数

是否Rohs认证：	符合	生命周期：	Active
零件包装代码：	SON	包装说明：	3 X 3 MM, ROHS COMPLIANT, MO-229VEED-5, TQFN-10
针数：	10	Reach Compliance Code：	compliant
ECCN代码：	EAR99	HTS代码：	8542.39.00.01
风险等级：	5.73	其他特性：	ALSO OPERATES IN ADJUSTABLE MODE FROM 0.8 TO 36 V
模拟集成电路 - 其他类型：	SWITCHING REGULATOR	控制模式：	CURRENT-MODE
最大输入电压：	36 V	最小输入电压：	4.5 V
标称输入电压：	12 V	JESD-30 代码：	S-PDSO-N10
JESD-609代码：	e3	长度：	3 mm
湿度敏感等级：	1	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	封装主体材料：	PLASTIC/EPOXY
封装代码：	HVSON	封装形状：	SQUARE
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：	0.8 mm
表面贴装：	YES	切换器配置：	BUCK
最大切换频率：	4900 kHz	温度等级：	INDUSTRIAL
端子面层：	MATTE TIN	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：	40	宽度：	3 mm
Base Number Matches：	1

MPQ4458DQT-Z-LF 数据手册

MPQ4458 –INDUSTRIAL GRADE,1A, 4MHz, 36V STEP-DOWN CONVERTER

APPLICATION INFORMATION

Setting the Frequency

Inductor

The MPQ4458 has an externally adjustable

frequency. The switching frequency can be set

using a resistor:

The inductor is required to supply constant

current to the output load while being driven by

the switched input voltage. A larger value

inductor will result in less ripple current that will

result in lower output ripple voltage. However,

the larger value inductor will have a larger

physical size, higher series resistance, and/or

lower saturation current. A good rule for

determining the inductance to use is to allow

the peak-to-peak ripple current in the inductor

to be approximately 30% of the maximum

switch current limit. Also, make sure that the

peak inductor current is below the maximum

switch current limit. The inductance value can

be calculated by:

180000

R_freq(kΩ) =

f_s(kHz)^1.1

Setting the Output Voltage

The output voltage is set using a resistive

voltage divider from the output voltage to FB pin.

The voltage divider divides the output voltage

down to the feedback voltage by the ratio:

V_FB= V

^OUTR1+ R2

Where V_FBis the feedback voltage and V_OUTis

the output voltage.

⎛

⎞

⎟

⎠

V_OUT

⎜

L1=

× 1−

⎜

⎝

f_S× ∆I_L

Thus the output voltage is:

Where V_INis the input voltage, fS is the

switching frequency, and ∆I_Lis the peak-to-

peak inductor ripple current. Choose an

inductor that will not saturate under the

maximum inductor peak current. The peak

inductor current can be calculated by:

(R1+ R2)

V_OUT= V_FB

A few µA of current from the high-side BS

circuitry can be seen at the output when the

MPQ4458 is at no load. In order to absorb this

small amount of current, keep R2 under 40kꢀ.

A typical value for R2 can be 40.2kꢀ. With this

value, R1 can be determined by:

⎛

⎞

⎟

⎠

V_OUT

⎜

I_LP= I_LOAD

× 1−

⎜

⎝

2 × f_S× L1

R1= 50.25 × (V_OUT− 0.8)(kΩ)

Where I_LOADis the load current. Table 1 lists a

number of suitable inductors from various

manufacturers. The choice of which style

inductor to use mainly depends on the price vs.

size requirements and any EMI requirement.

For example, for a 3.3V output voltage, R2 is

40.2kꢀ, and R1 is 127kꢀ.

MPQ4458 Rev. 0.9

12/10/2009

www.MonolithicPower.com

MPS Proprietary Information. Unauthorized Photocopy and Duplication Prohibited.

1...4 5 678 9 10...14

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与MPQ4458DQT-Z-LF相关器件

型号	品牌	描述	获取价格	数据表
MPQ4459	MPS	1.5A, 4MHz, 36V 降压变换器	获取价格
MPQ4459DQT	MPS	Switching Regulator, Current-mode, 4900kHz Switching Freq-Max, PDSO10, 3 X 3 MM, MO-229VEE	获取价格
MPQ4459DQT-LF	MPS	Switching Regulator, Current-mode, 4900kHz Switching Freq-Max, PDSO10, 3 X 3 MM, ROHS COMP	获取价格
MPQ4459DQT-LF-Z	MPS	Switching Regulator, Current-mode, 4000kHz Switching Freq-Max, PDSO10, 3 X 3 MM, ROHS COMP	获取价格
MPQ4459DQT-Z	MPS	Switching Regulator, Current-mode, 4900kHz Switching Freq-Max, PDSO10, 3 X 3 MM, MO-229VEE	获取价格
MPQ4459DQT-Z-LF	MPS	Switching Regulator, Current-mode, 4900kHz Switching Freq-Max, PDSO10, 3 X 3 MM, ROHS COMP	获取价格

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