Datasheet > LM2635

LM2635

更新时间： 2024-11-26 00:01:07

品牌	Logo	应用领域
美国国家半导体 - NSC		稳压器控制器
页数	文件大小	规格书
14页	277K
描述
5-Bit Programmable Synchronous Buck Regulator Controller

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LM2635 数据手册

May 2000

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

DS100119-1

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...14

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与LM2635相关器件

型号	品牌	获取价格	描述	数据表
LM2635M	NSC	获取价格	5-Bit Programmable Synchronous Buck Regulator Controller
LM2635MX	ETC	获取价格	Voltage-Mode SMPS Controller
LM2635MX/NOPB	TI	获取价格	SWITCHING CONTROLLER, 350kHz SWITCHING FREQ-MAX, PDSO20, PLASTIC, SO-20
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

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