MAX1638

更新时间： 2024-09-11 22:57:59

品牌	Logo	应用领域
美信 - MAXIM		控制器
页数	文件大小	规格书
16页	151K
描述
High-Speed Step-Down Controller with Synchronous Rectification for CPU Power

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数据手册

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MAX1638 数据手册

19-1313; Rev 0; 11/97

Hig h -S p e e d S t e p -Do w n Co n t ro lle r w it h

S yn c h ro n o u s Re c t ific a t io n fo r CP U P o w e r

MAX1638

_______________Ge n e ra l De s c rip t io n

____________________________Fe a t u re s

♦ Better than ±1% Output Accuracy Over

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 ±1% total accuracy from a +5V ±10% supply.

Excellent dynamic response corrects output transients

caused by the latest dynamically clocked CPUs. This

controller achieves over 90% efficiency by using synchro-

nous rectification. Flying-capacitor bootstrap circuitry

drives inexpensive, external N-channel MOSFETs.

Line and Load

♦ Greater than 90% Efficiency Using N-Channel

MOSFETs

♦ Pin-Selected High Switching Frequency (300kHz,

600kHz, or 1MHz)

♦ Over 35A Output Current

♦ Digitally Programmable Output from 1.3V to 3.5V

♦ Current-Mode Control for Fast Transient

Response and Cycle-by-Cycle Current-Limit

Protection

The switching frequency is pin-selectable for 300kHz,

600kHz, 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-Circuit Protection with Foldback Current

Limiting

♦ Glitch-Catcher Circuit for Fast Load-Transient

Response

The MAX1638 is available in 24-pin SSOP and QSOP

(future package) packages, and offers additional fea-

ture s s uc h a s a d ig ita lly p rog ra mma b le outp ut;

adjustable transient response; and selectable 0.5%, 1%,

or 2% 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 100%

duty factor when the output is 200mV above the normal

regulation point. Other features include internal digital

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

ence output.

♦ Crowbar Overvoltage Protection

♦ Power-Good (PWROK) Output

♦ Digital Soft-Start

♦ High-Current (2A) Drive Outputs

♦ Complies with Intel VRM 8.2 Specification

__________Typ ic a l Op e ra t in g Circ u it

INPUT

+5V

AGND

BST

________________________Ap p lic a t io n s

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

and K6™ Systems

TO V

MAX1638

Workstations

OUTPUT

1.3V TO 4.5V

Desktop Computers

LAN Servers

PWROK

GTL Bus Termination

PGND

______________Ord e rin g In fo rm a t io n

PART

TEMP. RANGE

-40°C to +85°C

PIN-PACKAGE

24 SSOP

REF

CSH

CSL

MAX1638EAG

MAX1638EEG*

24 QSOP

FREQ

CC1

Pin Configuration appears at end of data sheet.

*Future product—contact factory for package availability.

CC2

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 free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.

For small orders, phone 408-737-7600 ext. 3468.

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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