Rainbow-electronics MAX1625 User Manual download pdf

_______________General Description

The MAX1624/MAX1625 are ultra-high-performance,

step-down DC-DC controllers 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, they deliver

over 35A from 1.1V to 3.5V with ±1% total accuracy from

a +5V ±10% supply. Excellent dynamic response cor-

rects output transients caused by the latest dynamically

clocked CPUs. These controllers achieve over 90% effi-

ciency by using synchronous rectification. Flying-capaci-

tor bootstrap circuitry drives inexpensive, external

N-channel MOSFETs.

The switching frequency is resistor programmable from

100kHz to 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.

The MAX1624 is available in a 24-pin SSOP and offers

additional features such as a digitally programmable out-

put in 100mV increments; adjustable transient response;

selectable 0.5%, 1%, or 2% AC load regulation; and gate

drive for a current-boost MOSFET. The MAX1625 is resis-

tor adjustable and comes in a 16-pin narrow SO pack-

age. Other features in both controllers include internal

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

reference output. For a similar controller compatible with

the latest Intel V

specification, see the MAX1638*

data sheet.

________________________Applications

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

and K6™ Systems

Desktop Computers

LAN Servers

Industrial Computers

GTL Bus Termination

____________________________Features

♦ Better than ±1% Output Accuracy Over

Line and Load

♦ 90% Efficiency

♦ Excellent Transient Response

♦ Resistor-Programmable Fixed Switching

Frequency from 100kHz to 1MHz

♦ Over 35A Output Current

♦ Digitally Programmable Output from 1.1V to 3.5V

in 100mV Increments (MAX1624)

♦ Resistor-Adjustable Output down to 1.1V

(MAX1625)

♦ Remote Sensing

♦ Adjustable AC Loop Gain (MAX1624)

♦ GlitchCatcher™ Circuit for Fast Load-Transient

Response (MAX1624)

♦ Power-Good (PWROK) Output

♦ Current-Mode Feedback

♦ Digital Soft-Start

♦ Strong 2A Gate Drivers

♦ Current-Limited Output

MAX1624/MAX1625

High-Speed Step-Down Controllers with

Synchronous Rectification for CPU Power

________________________________________________________________

Maxim Integrated Products

19-1227; Rev 1; 6/97

PART

MAX1624EAG

MAX1625ESE

-40°C to +85°C

TEMP. RANGE PIN-PACKAGE

24 SSOP

16 Narrow SO

______________Ordering Information

__________Typical Operating Circuit

Pin Configurations appear at end of data sheet.

Future product.

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.

EVALUATION KIT

AVAILABLE

FREQ

CC2

CC1

REF

AGND

(SIMPLIFIED)

PWROK

BST

CSL

CSH

TO V

TO AGND

PGND

OUTPUT

1.1V TO 4.5V

INPUT

+5V

MAX1625

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.

1 2 3 4 5 6 ... 23 24

MAX1624/MAX1625 1

Summary of Contents

Page 1 - MAX1624/MAX1625

_______________General DescriptionThe MAX1624/MAX1625 are ultra-high-performance,step-down DC-DC controllers for CPU power in high-endcomputer systems

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kHzMAX1624/MAX1625High-Speed Step-Down Controllers withSynchronous Rectification for CPU Power2 ______________________________________________________

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Page 18

ELECTRICAL CHARACTERISTICS (continued)(VDD= VCC = D4 = +5V, PGND = AGND = D0–D3 = 0V, RFREQ = 33.3kΩ, TA= 0°C to +85°C, unless otherwise noted.) MAX16

Page 19

mAMAX1624/MAX1625High-Speed Step-Down Controllers withSynchronous Rectification for CPU Power4 _______________________________________________________

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MAX1624/MAX1625High-Speed Step-Down Controllers withSynchronous Rectification for CPU Power___________________________________________________________

Page 21

10µs/divMAX1624 LOAD-TRANSIENT RESPONSE (WITH GLITCHCATCHER)(3.5V)CMAX1624/25 TOC16A: VOUT, 100mV/div, AC COUPLEDB: INDUCTOR CURRENT, 10A/divC: LOAD C

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MAX1624/MAX1625High-Speed Step-Down Controllers withSynchronous Rectification for CPU Power___________________________________________________________

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Rainbow-electronics MAX1625 User Manual

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