Datasheet > MAX1638

MAX1638

更新时间： 2024-09-13 14:58:15

品牌	Logo	应用领域
亚德诺 - ADI		控制器
页数	文件大小	规格书
16页	416K
描述
高速、同步整流、降压型控制器，用于CPU电源

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数据手册

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MAX1638 数据手册

19-1313; Rev 1; 8/05

High-Speed Step-Down Controller with

Synchronous Rectification for CPU Power

General Description

____________________________Features

♦ Better than ±±1 ꢀOtꢁOt ꢂAAOraAc ꢀꢃer

The MAX1638 is an ultra-high-performance, step-down

DC-DC controller for CPU power in high-end computer

systems. Designed for demanding applications in which

output voltage precision and good transient response are

critical for proper operation, it delivers over 35A from 1.3V

to 3.5V with 1ꢀ total accuracy from a ꢁ5V 1ꢂꢀ supply.

Excellent dynamic response corrects output transients

caused by the latest dynamically clocked CPUs. This

controller achieves over 9ꢂꢀ efficiency by using synchro-

nous rectification. Flying-capacitor bootstrap circuitry

drives inexpensive, external N-channel MOSFETs.

Line and Load

♦ Greater than 901 EffiAienAc Using N-Channel

MꢀSFETs

♦ Pin-SeleAted High SwitAhing FreqOenAc (300kHz,

600kHz, or ±MHz)

♦ ꢀꢃer 35ꢂ ꢀOtꢁOt COrrent

♦ Digitallc Programmable ꢀOtꢁOt from ±.3V to 3.5V

♦ COrrent-Mode Control for Fast Transient

Resꢁonse and CcAle-bc-CcAle COrrent-Limit

ProteAtion

The switching frequency is pin-selectable for 3ꢂꢂkHz,

6ꢂꢂkHz, or 1MHz. High switching frequencies allow the

use of a small surface-mount inductor and decrease out-

put filter capacitor requirements, reducing board area

and system cost.

♦ Short-CirAOit ProteAtion with FoldbaAk COrrent

Limiting

♦ GlitAh-CatAher CirAOit for Fast Load-Transient

Resꢁonse

The MAX1638 is available in 24-pin SSOP and QSOP

(future package) packages, and offers additional fea-

tures such as a digitally programmable output;

adjustable transient response; and selectable ꢂ.5ꢀ, 1ꢀ,

or 2ꢀ AC load regulation. Fast recovery from load tran-

sients is ensured by a GlitchCatcher™ current-boost cir-

cuit that eliminates delays caused by the buck inductor.

Output overvoltage protection is enforced by a crowbar

circuit that turns on the low-side MOSFET with 1ꢂꢂꢀ

duty factor when the output is 2ꢂꢂmV above the normal

regulation point. Other features include internal digital

soft-start, a power-good output, and a 3.5V 1ꢀ refer-

ence output.

♦ Crowbar ꢀꢃerꢃoltage ProteAtion

♦ Power-Good (PWRꢀK) ꢀOtꢁOt

♦ Digital Soft-Start

♦ High-COrrent (2ꢂ) Driꢃe ꢀOtꢁOts

♦ Comꢁlies with Intel VRM 8.2 SꢁeAifiAation

Typical Operating Circuit

INPUT

+5V

AGND

BST

________________________Applications

Pentium Pro™, Pentium II™, PowerPC™, Alpha™,

and K6™ Systems

TO V

MAX1638

Workstations

OUTPUT

1.3V TO 4.5V

Desktop Computers

LAN Servers

GTL Bus Termination

PWROK

PGND

Ordering Information

PꢂRT

MAX1638EAG

TEMP RꢂNGE

-4ꢂ°C to ꢁ85°C

PIN-PꢂCKꢂGE

24 SSOP

REF

CSH

CSL

MAX1638EAGꢁ

24 QSOP

FREQ

CC1

CC2

ꢁDenotes lead-free package.

Pin Configuration appears at end of data sheet.

Pentium Pro and Pentium II are trademarks of Intel Corp.

PowerPC is a trademark of IBM Corp.

Alpha is a trademark of Digital Equipment Corp.

K6 is a trademark of Advanced Micro Devices.

GlitchCatcher is a trademark of Maxim Integrated Products.

________________________________________________________________ Maxim Integrated Products

For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at

1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

12 3 4 5 6 7...16

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与MAX1638相关器件

型号	品牌	获取价格	描述	数据表
MAX1638EAG	MAXIM	获取价格	High-Speed Step-Down Controller with Synchronous Rectification for CPU Power
MAX1638EAG+	MAXIM	获取价格	Switching Controller, Current-mode, 1200kHz Switching Freq-Max, BICMOS, PDSO24, LEAD FREE,
MAX1638EAG+T	MAXIM	获取价格	Switching Controller, Current-mode, 1000kHz Switching Freq-Max, BICMOS, PDSO24, 0.200 INCH
MAX1638EAG-T	MAXIM	获取价格	Switching Controller, Current-mode, 1200kHz Switching Freq-Max, BICMOS, PDSO24, SSOP-24
MAX1638EEG	MAXIM	获取价格
MAX1638EVKIT	MAXIM	获取价格	Isolated Transformer Driver for PCMCIA Applications[MAX845/MAX845C/D/MAX845ESA/MAX845ESA-T
MAX1639	MAXIM	获取价格	High-Speed Step-Down Controller with Synchronous Rectification for CPU Power
MAX1639	ADI	获取价格	高速、同步整流、降压型控制器，用于CPU电源
MAX1639ESE	MAXIM	获取价格	High-Speed Step-Down Controller with Synchronous Rectification for CPU Power
MAX1639ESE+	MAXIM	获取价格	Switching Controller, Current-mode, 1200kHz Switching Freq-Max, BICMOS, PDSO16, LEAD FREE,

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