MAX1638EAG+ Maxim Integrated Products, MAX1638EAG+ Datasheet

MAX1638EAG+

Manufacturer Part Number

MAX1638EAG+

Description

IC STEP-DWN CTRLR HI-SPD 24-SSOP

Manufacturer

Maxim Integrated Products

Datasheet

1.MAX1638EAG.pdf (16 pages)

Specifications of MAX1638EAG+

Applications

Controller, Intel Pentium® II

Voltage - Input

4.5 ~ 5.5 V

Number Of Outputs

Voltage - Output

1.3 ~ 5.5 V

Operating Temperature

-40°C ~ 85°C

Mounting Type

Surface Mount

Package / Case

24-SSOP

Output Voltage

1.3 V to 5.5 V

Output Current

35 A

Input Voltage

4.5 V to 5.5 V

Mounting Style

SMD/SMT

Maximum Operating Temperature

+ 85 C

Minimum Operating Temperature

- 40 C

Lead Free Status / RoHS Status

Lead free / RoHS Compliant

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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.

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.

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 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.

________________________Applications

Pin Configuration appears at end of data sheet.

+Denotes lead-free package.

19-1313; Rev 1; 8/05

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.

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.

MAX1638EAG

MAX1638EAG+

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

and K6™ Systems

Workstations

Desktop Computers

LAN Servers

GTL Bus Termination

PART

Synchronous Rectification for CPU Power

________________________________________________________________ Maxim Integrated Products

-40°C to +85°C

TEMP RANGE

Ordering Information

High-Speed Step-Down Controller with

General Description

24 SSOP

24 QSOP

PIN-PACKAGE

♦ Better than ±1% Output Accuracy Over

♦ Greater than 90% Efficiency Using N-Channel

♦ Pin-Selected High Switching Frequency (300kHz,

♦ Over 35A Output Current

♦ Digitally Programmable Output from 1.3V to 3.5V

♦ Current-Mode Control for Fast Transient

♦ Short-Circuit Protection with Foldback Current

♦ Glitch-Catcher Circuit for Fast Load-Transient

♦ Crowbar Overvoltage Protection

♦ Power-Good (PWROK) Output

♦ Digital Soft-Start

♦ High-Current (2A) Drive Outputs

♦ Complies with Intel VRM 8.2 Specification

____________________________Features

Line and Load

MOSFETs

600kHz, or 1MHz)

Response and Cycle-by-Cycle Current-Limit

Protection

Limiting

Response

TO V

AGND

PWROK

REF

FREQ

CC1

CC2

MAX1638

Typical Operating Circuit

PGND

CSH

CSL

BST

INPUT

+5V

1.3V TO 4.5V

OUTPUT

Related parts for MAX1638EAG+

MAX1638EAG+ Summary of contents

Page 1

... GTL Bus Termination Ordering Information PART TEMP RANGE MAX1638EAG -40°C to +85°C MAX1638EAG+ -40°C to +85°C +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. ...

Page 2

High-Speed Step-Down Controller with Synchronous Rectification for CPU Power ABSOLUTE MAXIMUM RATINGS PWROK to AGND ......................................-0. PGND to AGND ..................................................................±0.3V CSH, CSL to AGND ....................................-0. NDRV, PDRV PGND.........................-0.3V ...

Page 3

High-Speed Step-Down Controller with Synchronous Rectification for CPU Power ELECTRICAL CHARACTERISTICS (continued +5V, PGND = AGND = D0–D3 = 0V, FREQ = REF PARAMETER Maximum Duty Cycle FREQ = V GND ...

Page 4

High-Speed Step-Down Controller with Synchronous Rectification for CPU Power ELECTRICAL CHARACTERISTICS ( +5V, PGND = AGND = D0–D3= 0V, FREQ = REF PARAMETER Input Voltage Range V CC Input Undervoltage Lockout V ...

Page 5

High-Speed Step-Down Controller with Synchronous Rectification for CPU Power __________________________________________Typical Operating Characteristics (T = +25°C, using the MAX1638 evaluation kit, unless otherwise noted.) A LOAD-TRANSIENT RESPONSE WITHOUT GLITCHCATCHER (C = 880μF) OUT A B 10μs/div ...

Page 6

High-Speed Step-Down Controller with Synchronous Rectification for CPU Power ______________________________________________________________Pin Description PIN NAME Boost-Capacitor Bypass for High-Side MOSFET Gate Drive. Connect a 0.1µF capacitor and low-leak- 1 BST age Schottky diode as a bootstrapped charge-pump circuit to derive a 5V ...

Page 7

High-Speed Step-Down Controller with Synchronous Rectification for CPU Power R5 10Ω 0.1μF 10μ 100k PWROK MAX1638 D4 LG FREQ PGND REF C4, 1.0μF CERAMIC CC2 CC2 0.056μF ...

Page 8

High-Speed Step-Down Controller with Synchronous Rectification for CPU Power REF1 REF4 AGND MAX1638 V CC OSCILLATOR FREQ CC1 40k CC2 10k g m REF FB Figure 2. Simplified Block Diagram 8 _______________________________________________________________________________________ REF REF3 REF2 SLOPE COMPENSATION RESET REF SET ...

Page 9

High-Speed Step-Down Controller with Synchronous Rectification for CPU Power Table 1. Component List for Standard Applications COMPONENT 2.0V, 14A (x3) Sanyo OS-CON 10SA220M C1 (220μF) (x4) Sanyo OS-CON 4SP220M C2 (220μF) D1 Nihon NSQ03A02 Schottky (optional) diode or Motorola MBRS340 ...

Page 10

High-Speed Step-Down Controller with Synchronous Rectification for CPU Power Synchronous-Rectifier Driver Synchronous rectification reduces conduction losses in the rectifier by shunting the normal Schottky diode or MOSFET body diode with a low-on-resistance MOSFET switch. The synchronous rectifier also ensures proper ...

Page 11

High-Speed Step-Down Controller with Synchronous Rectification for CPU Power 100 100 V (%) FB Figure 4. Foldback Current Limit High-Side ...

Page 12

High-Speed Step-Down Controller with Synchronous Rectification for CPU Power R6 10Ω 0.1μF 10μ CSH R5 100k PWROK CSL D0 BST MAX1638 D4 REF LG NO FREQ CONNECTION PGND ...

Page 13

High-Speed Step-Down Controller with Synchronous Rectification for CPU Power Table 2. Output Voltage Adjustment Settings OUTPUT VOLTAGE ( 2.050 2.000 ...

Page 14

High-Speed Step-Down Controller with Synchronous Rectification for CPU Power Use I from the equation in the section Specifying PEAK the Inductor SENSE I PEAK The high inductance of standard wire-wound resistors can degrade performance. Low-inductance resistors, ...

Page 15

High-Speed Step-Down Controller with Synchronous Rectification for CPU Power should be less than 200nC to minimize switching losses and reduce power dissipation losses are the greatest heat contributor to MOSFET power dissipation and are distributed between the ...

Page 16

... Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. 16 __________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 (408) 737-7600 © 2005 Maxim Integrated Products C2 ...

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