CXMD3258单相恒定时间同步的PWM控制器驱动N通道mosfet功率因数调制PFM或脉宽调制PWM模式下提供出色的瞬态响应和精确的直流电压输出

CXMD3258是一个单相、恒定时间、同步的PWM控制器，它驱动N通道mosfet。CXMD3258降低高压，在笔记本电脑中生成低压芯片组或RAM电源。CXMD3258在功率因数调制（PFM）或脉宽调制（PWM）模式下都能提供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，CXMD3258通过负载调制开关频率在轻到重负载上提供非常高的效率。在PWM模式下，该变换器工作在几乎恒定的频率下，以达到低噪声的要求。CXMD3258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。上电复位功能监视VCC上的电压，以防止上电期间出现错误操作。CXMD3258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。一个内部集成的软启动斜坡输出电压与可编程的转换率，以减少启动电流。软停止功能用受控的反向电感电流对输出电容进行主动放电。CXMD3258提供10针TDFN 3x3产品包。

可调输出电压从+0.7V到+5.5V
0.7V参考电压
超过温度时精度为±1%
在蓄电池输入电压为+1.8V至+32V的范围内工作
VCC引脚上电复位监控
良好的线路和负载瞬态响应
提高轻载效率的PFM模式
从4个预设值中选择脉宽调制频率
集成MOSFET驱动器
集成自举正激P-CH MOSFET
可调集成软启动和软停止
可选择强制脉宽调制或自动功率因数调制/脉宽调制模式
功率良好监测
70%欠压保护
125%过电压保护
可调限流保护
使用感测低边MOSFET的RDS（开）
过温保护
从保护模式自动返工
TDFN-10 3x3包装
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 CXMD3258 is a single-phase, constant-on-time, synchronous PWM controller, which drives N-channel MOSFETs. The CXMD3258 steps down high voltage to generate low-voltage chipset or RAM supplies in notebook computers. The CXMD3258 provides excellent transient response and accurate DC voltage output in either PFM or PWM Mode. In Pulse Frequency Mode (PFM), the CXMD3258 provides very high efficiency over light to heavy loads with loading- modulated switching frequencies. In PWM Mode, the converter works nearly at constant frequency forlow-noise requirements. The CXMD3258 is equipped with accurate positive current- limit, output under-voltage, and output over-voltage protections, perfect for NB applications. The Power-OnReset function monitors the voltage on VCC to prevent wrong operation during power-on. The CXMD3258 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 CXMD3258 is available in 10pin TDFN 3x3 package.

   产品特点 返回TOP

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Adjustable Output Voltage from +0.7V to +5.5V

0.7V Reference Voltage

±1% Accuracy Over-Temperature

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

Power-On-Reset Monitoring on VCC Pin

Excellent Line and Load Transient Responses

PFM Mode for Increased Light Load Efficiency

Selectable PWM Frequency from 4 Preset Values

Integrated MOSFET Drivers

Integrated Bootstrap Forward P-CH MOSFET

Adjustable Integrated Soft-Start and Soft-Stop

Selectable Forced PWM or Automatic PFM/PWM Mode

Power Good Monitoring

70% Under-Voltage Protection

125% Over-Voltage Protection

Adjustable Current-Limit Protection

Using Sense Low-Side MOSFET’s RDS(ON)

Over-Temperature Protection

Auto Rework from Protection Mode

TDFN-10 3x3 Package

Lead Free and Green Devices Available (RoHS Compliant)

   应用范围 返回TOP

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Notebook

Table PC

Hand-Held Portable

AIO PC

LCD Monitor / TV

Battery Charger

ADSL Modem

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