CXMD3259 PFM或PWM模式下提供瞬态响应和精确的直流电压输出自举正向P-CH MOSFET可调输出电压0.7V到5.5V电源复位监控 PFM模式提高轻载效率

CXMD3259是一个单相、恒定时间、同步的脉冲宽度调制控制器，驱动N通道mosfet。CXMD3259降低高压，在笔记本电脑中生成低压芯片组或RAM电源。CXMD3259在PFM或PWM模式下提供了出色的瞬态响应和精确的直流电压输出。在脉冲频率模式（PFM）中，CXMD3259在负载调制开关频率的轻到重负载上提供非常高的效率。在PWM模式下，为了达到低噪声的要求，变换器几乎以恒定频率工作。CXMD3259配备了精确的正电流限制、输出欠压和输出过压保护，非常适合NB应用。通电复位功能监控VCC上的电压，以防止通电期间出现错误操作。CXMD3259具有1毫秒数字软启动和内置的软停止输出放电集成方法。内部集成的软启动以可编程的转换率提高输出电压，以降低启动电流。软停止功能利用受控的反向电感电流对输出电容器进行主动放电。CXMD3259提供10针TDFN 3x3产品包。

z可调输出电压从+0.7V到+5.5V
z 0.7V参考电压
z±1%精度超温
z在蓄电池输入电压为+1.8V至+32V的范围内工作
VCC引脚上的z电源开复位监控
z卓越的线和负载瞬态响应z PFM模式可提高轻载效率
z可从4个预设值中选择脉宽调制频率
z集成MOSFET驱动器
z集成自举正向P-CH MOSFET
z可调集成软启动和软停止
z可选强制脉宽调制或自动功率因数调制/脉宽调制模式
z电源良好监控
z 70%欠压保护
z 125%过电压保护
z可调限流保护
z使用感测低侧MOSFET的RDS（开）
z过热保护
z保护模式自动返工
z TDFN‐10 3x3包装
z提供无铅和绿色设备（符合RoHS）

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 CXMD3259 is a single‐phase, constant‐on‐time, synchronous PWM controller, which drives N‐channel MOSFETs. The CXMD3259 steps down high voltage to generate low‐voltage chipset or RAM supplies in notebook computers. The CXMD3259 provides excellent transient response and accurate DC voltage output in either PFM or PWM Mode. In Pulse Frequency Mode (PFM), the CXMD3259 provides very high efficiency over light to heavy loads with loading‐ modulated switching frequencies. In PWM Mode, the converter works nearly at constant frequency for low‐noise requirements. The CXMD3259 is equipped with accurate positive current‐ limit, output under‐voltage, and output over‐voltage protections, perfect for NB applications. The Power‐On‐  Reset function monitors the voltage on VCC to prevent wrong operation during power‐on. The CXMD3259 has a 1ms digital soft‐start and built‐in an integrated output discharge method for soft‐stop. An internal integrated soft‐start ramps up the output voltage with programmable slew rate to reduce the start‐up current. A soft‐stop function actively discharges the output capacitors with controlled reverse inductor current. The CXMD3259 is available in 10pin TDFN 3x3 package.

   产品特点 返回TOP

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z Adjustable Output Voltage from +0.7V to +5.5V 

z 0.7V Reference Voltage 

z ±1% Accuracy Over‐Temperature 

z Operates from an Input Battery Voltage Range of +1.8V to +32V 

z Power‐On‐Reset Monitoring on VCC Pin 

z Excellent Line and Load Transient Responses z PFM Mode for Increased Light Load Efficiency 

z Selectable PWM Frequency from 4 Preset Values 

z Integrated MOSFET Drivers 

z Integrated Bootstrap Forward P‐CH MOSFET 

z Adjustable Integrated Soft‐Start and Soft‐Stop 

z Selectable Forced PWM or Automatic PFM/PWM Mode 

z Power Good Monitoring 

z 70% Under‐Voltage Protection 

z 125% Over‐Voltage Protection 

z Adjustable Current‐Limit Protection 

z Using Sense Low‐Side MOSFET’s RDS(ON) 

z Over‐Temperature Protection 

z Auto Rework from Protection Mode 

z TDFN‐10 3x3 Package 

z Lead Free and Green Devices Available (RoHS Compliant)

   应用范围 返回TOP

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z Notebook 

z Table PC 

z Hand‐Held Portable 

z AIO PC 

z LCD Monitor / TV 

z Battery Charger 

z ADSL Modem 

z Telecom / Networking Equipment

   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