Datasheet > LM2635MX/NOPB

LM2635MX/NOPB

更新时间： 2024-09-08 14:52:27

品牌	Logo	应用领域
德州仪器 - TI		信息通信管理开关光电二极管
页数	文件大小	规格书
13页	731K
描述
SWITCHING CONTROLLER, 350kHz SWITCHING FREQ-MAX, PDSO20, PLASTIC, SO-20

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LM2635MX/NOPB 技术参数

是否Rohs认证：	符合	生命周期：	Obsolete
包装说明：	SOP, SOP20,.4	Reach Compliance Code：	compliant
ECCN代码：	EAR99	HTS代码：	8542.39.00.01
风险等级：	5.83	模拟集成电路 - 其他类型：	SWITCHING CONTROLLER
控制模式：	VOLTAGE-MODE	控制技术：	PULSE WIDTH MODULATION
最大输入电压：	5.5 V	最小输入电压：	4.5 V
标称输入电压：	5 V	JESD-30 代码：	R-PDSO-G20
JESD-609代码：	e3	长度：	12.8 mm
湿度敏感等级：	3	功能数量：	1
端子数量：	20	最高工作温度：	70 °C
最低工作温度：		封装主体材料：	PLASTIC/EPOXY
封装代码：	SOP	封装等效代码：	SOP20,.4
封装形状：	RECTANGULAR	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：	2.65 mm	子类别：	Switching Regulator or Controllers
表面贴装：	YES	切换器配置：	BUCK
最大切换频率：	350 kHz	技术：	BICMOS
温度等级：	COMMERCIAL	端子面层：	Matte Tin (Sn)
端子形式：	GULL WING	端子节距：	1.27 mm
端子位置：	DUAL	处于峰值回流温度下的最长时间：	NOT SPECIFIED
宽度：	7.5 mm	Base Number Matches：	1

LM2635MX/NOPB 数据手册

March 2005

LM2635 5-Bit Programmable

Synchronous Buck Regulator Controller

2% over temperature is available externally for use by other

regulators. Dynamic positioning of load voltage, which helps

cut the number of output capacitors, can also be imple-

mented easily.

General Description

The LM2635 is a high speed controller designed specifically

for use in synchronous DC/DC buck converters for the

™

Pentium II or Deschutes microprocessor. A 5-bit DAC ac-

cepts the VID code directly from the CPU and adjusts the

output voltage from 1.8V to 3.5V. It provides the power good,

over-voltage protection, and output enable features as re-

quired by Intel VRM specifications. Current limiting is

achieved by monitoring the voltage drop across the r_{DS_ON}

of the high side MOSFET, which eliminates an expensive

current sense resistor.

Features

n 1.8V to 3.5V 5-bit programmable output voltage

n Synchronous rectification

n Power Good flag and output enable

n Over-voltage protection

n Initial Output Accuracy: 2% over temperature

n Current limit without external sense resistor

n Adaptive non-overlapping MOSFET gate drives

n Adjustable switching frequency: 50 kHz to 1 MHz

n Dynamic output voltage positioning

n 1.256V reference voltage available externally

n Plastic SO-20 package

The LM2635 employs a fixed-frequency voltage mode PWM

architecture. To provide a faster response to a large and fast

load transient, two ultra-fast comparators are built in to moni-

tor the output voltage and override the primary control loop

when necessary. The PWM frequency is adjustable from 50

kHz to 1 MHz through an external resistor. The wide range of

PWM frequency gives the power supply designer the flexibil-

ity to make trade-offs between load transient response per-

formance, MOSFET cost and the overall efficiency. The

adaptive non-overlapping MOSFET gate drivers help avoid

any potential shoot-through problem while maintaining high

efficiency. BiCMOS gate drivers with rail-to-rail swing ensure

that no spurious turn-on occur. When only 5V is available, a

bootstrap structure can be employed to accommodate an

NMOS high side switch. The precision reference trimmed to

Applications

n Motherboard power supply/VRM for Cyrix Gxm, Cyrix

Gxi, Cyrix MII, Pentium II, Deschutes, Pentium Pro,

6x86 and K6 processors

n 5V to 1.8V–3.5V high current power supplies

Typical Application

10011901

FIGURE 1. 5V to 1.8V–3.5V, 14A Power Supply

™

Pentium is a trademark of Intel Corporation.

DS100119

www.national.com

12 3 4 5 6 7...13

中文翻译

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与LM2635MX/NOPB相关器件

型号	品牌	获取价格	描述	数据表
LM2636	NSC	获取价格	5-Bit Programmable Synchronous Buck Regulator Controller
LM2636M	NSC	获取价格	5-Bit Programmable Synchronous Buck Regulator Controller
LM2636MTC	NSC	获取价格	5-Bit Programmable Synchronous Buck Regulator Controller
LM2636MTC/NOPB	ROCHESTER	获取价格	SWITCHING CONTROLLER, 2000kHz SWITCHING FREQ-MAX, PDSO20, PLASTIC, TSSOP-20
LM2636MTC/NOPB	TI	获取价格	SWITCHING CONTROLLER, 2000kHz SWITCHING FREQ-MAX, PDSO20, PLASTIC, TSSOP-20
LM2636MTCX	ETC	获取价格	Voltage-Mode SMPS Controller
LM2636MTCX/NOPB	ROCHESTER	获取价格	SWITCHING CONTROLLER, 2000kHz SWITCHING FREQ-MAX, PDSO20, PLASTIC, TSSOP-20
LM2636MTCX/NOPB	TI	获取价格	SWITCHING CONTROLLER, 2000kHz SWITCHING FREQ-MAX, PDSO20, PLASTIC, TSSOP-20
LM2636MWC	NSC	获取价格	IC SWITCHING CONTROLLER, 2000 kHz SWITCHING FREQ-MAX, UUC, WAFER, Switching Regulator or C
LM2636MX	ETC	获取价格	Voltage-Mode SMPS Controller

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