CXMD3255电压模式固定300kHz开关频率同步降压转换器宽输入电压5~12V上电复位POR电路监测VCC电源电压防止错误的逻辑控制外部补偿的l电压模式PWM控制

CXMD3255是一种电压模式、固定300kHz开关频率、同步降压转换器。CXMD3255允许宽输入电压，可以是单个5~12V，也可以是用于各种应用的两个电源电压。上电复位（POR）电路监测VCC电源电压，以防止错误的逻辑控制。内置软启动电路，防止输出电压过冲，限制输入电流。为了满足低输出电压应用的要求，设计了一种高精度的0.8V温度补偿参考电压源。CXMD3255针对负载电流变化提供了出色的输出电压调节。控制器的过电流保护通过使用低侧MOSFET的RDS（ON）上的电压降来监测输出电流，从而消除了对具有高效率和低成本的电流传感电阻器的需求。此外，CXMD3255还集成了出色的保护功能：过电压保护（OVP）、欠电压保护（UVP）。监视FB电压以防止过电压输出的OVP电路，以及监视FB电压以防止电压过低或短路输出的UVP电路。CXMD3255有SOP-8P和TDFN3x3-10两个软件包。
l宽5V至16V电源电压
l VCC上的上电复位监控
l卓越的输出电压调节0.8V
内部参考温度超过温度范围±1%
l集成软启动
带外部补偿的l电压模式PWM操作
l高达90%的快速瞬态响应占空比
l恒定开关频率300kHz±10%
带自适应死区控制的l驱动双低成本N-mosfet
l 50%欠压保护
l 125%过电压保护
l使用低侧MOSFET的RDS（ON）可调过电流保护阈值
压缩机停机控制
l电源良好监测（仅TDFN-10 3mmx3mm封装）

目录

1.产品概述       2.产品特点     

3.应用范围       4.技术规格书下载（PDF文档）

5.产品封装       6.电路原理图  

7.相关产品

   产品概述 返回TOP

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The CXMD3255 is a voltage mode, fixed 300kHz switching frequency, synchronous buck converter. The CXMD3255 allows wide input voltage that is either a single 5~12V or two supply voltage(s) for various applications. A power-on-reset (POR) circuit monitors the VCC supply voltage to prevent wrong logic controls. A builtin soft-start circuit prevents the output voltages from overshoot as well as limits the input current. An internal 0.8V temperature-compensated reference voltage with high accuracy is designed to meet the requirement of low output voltage applications. The CXMD3255 provides excellent output voltage regulations against load current variation. The controller’s over-current protection monitors the output current by using the voltage drop across the RDS(ON) of low-side MOSFET, eliminating the need for a current sensing resistor that features high efficiency and low cost. In addition, the CXMD3255 also integrates excellent protection functions: The over-voltage protection (OVP) , under- voltage protection (UVP). OVP circuit which monitors the FB voltage to prevent the PWM output from overvoltage,and UVP circuit which monitors the FB voltage to prevent the PWM output from under-voltage or short-circuit.The CXMD3255is available in SOP-8P and TDFN3x3-10 packages.

   产品特点 返回TOP

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l  Wide 5V to 16V Supply Voltage

l  Power-On-Reset Monitoring on VCC

l  Excellent Output Voltage Regulations 0.8V

   Internal Reference ±1% Over-Temperature Range

l  Integrated Soft-Start

l  Voltage Mode PWM Operation with External Compensation

l  Up to 90% Duty Ratio for Fast Transient Response

l  Constant Switching Frequency 300kHz ±10%

l  Drive Dual Low Cost N-MOSFETs with Adaptive Dead-Time Control

l  50% Under-Voltage Protection

l  125% Over-Voltage Protection

l  Adjustable Over-Current Protection Threshold Using the RDS(ON) of Low-Side MOSFET

l  Shutdown Control by COMP

l  Power Good Monitoring (TDFN-10 3mmx3mm Package Only)

l  SOP-8P and TDFN3x3-10 Packages

l  Lead Free and Green Devices Available (RoHS Compliant

   应用范围 返回TOP

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 Graphic Cards 

 DSL, Switch HUB 

 Wireless Lan 

 Notebook Computer 

 Mother Board 

 LCD Monitor/TV

   技术规格书（产品PDF) 返回TOP 

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产品封装图 返回TOP

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电路原理图 返回TOP

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PWM Controller(脉宽调制控制器)
Part No.	Input Voltage	Output  Voltage	Frequency	Efficiency	Package	precision	Over	Over	Short Protection
							Current	Temperature
							Protection	Protection
CXMD3255	16V	ADJ	300KHZ	93%	SOP8/DFN3*3-10DFN3*3-10	2%	Y	Y	Y
CXMD3256	16V	ADJ	200KHz/300KHZ /600KHz	93%	SOP8 DFN3*3-10	2%	Y	Y	Y
CXMD3257	35V	ADJ	290-430KHz	93%	DFN3*3-10	2%	Y	Y	Y
CXMD3258	35V	ADJ	290-430KHz	93%	DFN3*3-10	2%	Y	Y	Y
CXMD3259	35V	ADJ	135-215KHz	93%	DFN3*3-10	2%	Y	Y	Y
CXMD3260	35V	ADJ	135-215KHz	93%	DFN3*3-10	2%	Y	Y	Y
CXMD3261	40V	-	100-300KHz	-	QFN20		Y	Y	Y