MAX8632 Datasheet_PDF文件下载_芯片资料查询

19-3623; Rev 0; 3/05

IT

TION K

VALUA

E

BLE

AVAILA

Integrated DDR Power-Supply Solution

for Desktops, Notebooks, and Graphic Cards

General Description

Features

Buck Controller

鈾?/div>

Quick-PWM with 100ns Load-Step Response

鈾?/div>

Up to 95% Efficiency

鈾?/div>

2V to 28V Input Voltage Range

鈾?/div>

1.8V/2.5V Fixed or 0.7V to 5.5V Adjustable Output

鈾?/div>

Up to 600kHz Selectable Switching Frequency

鈾?/div>

Programmable Current Limit with Foldback

Capability

鈾?/div>

1.7ms Digital Soft-Start

鈾?/div>

Independent Shutdown and Standby Controls

鈾?/div>

Overvoltage-/Undervoltage-Protection Option

鈾?/div>

Power-Good Window Comparator

LDO Section

鈾?/div>

Fully Integrated VTT and VTTR Capability

鈾?/div>

VTT Has 卤3A Sourcing/Sinking Capability

鈾?/div>

Only 20碌F Ceramic Capacitance Required for VTT

鈾?/div>

VTT and VTTR Outputs Track V

REFIN

/ 2

鈾?/div>

All-Ceramic Output-Capacitor Designs

鈾?/div>

1.0V to 2.8V Input Voltage Range

鈾?/div>

Power-Good Window Comparator

MAX8632

The MAX8632 integrates a synchronous-buck PWM con-

troller to generate V

DDQ

, a sourcing and sinking LDO lin-

ear regulator to generate V

TT

, and a 10mA reference

output buffer to generate V

TTR

. The buck controller drives

two external n-channel MOSFETs to generate output volt-

ages down to 0.7V from a 2V to 28V input with output cur-

rents up to 15A. The LDO can sink or source up to 1.5A

continuous and 3A peak current. Both the LDO output

and the 10mA reference buffer output can be made to

track the REFIN voltage. These features make the

MAX8632 ideally suited for DDR memory applications in

desktops, notebooks, and graphic cards.

The PWM controller in the MAX8632 utilizes Maxim鈥檚

proprietary Quick-PWM鈩?architecture with programma-

ble switching frequencies of up to 600kHz. This control

scheme handles wide input/output voltage ratios with

ease and provides 100ns response to load transients

while maintaining high efficiency and a relatively con-

stant switching frequency. The MAX8632 offers fully pro-

grammable UVP/OVP and skip-mode options ideal in

portable applications. Skip mode allows for improved

efficiency at lighter loads.

The VTT and VTTR outputs track to within 1% of V

REFIN

/ 2.

The high bandwidth of this LDO regulator allows excel-

lent transient response without the need for bulk capac-

itors, thus reducing cost and size.

The buck controller and LDO regulators are provided with

independent current limits. Adjustable lossless foldback

current limit for the buck regulator is achieved by monitor-

ing the drain-to-source voltage drop of the low-side

MOSFET. Additionally, overvoltage and undervoltage pro-

tection mechanisms are built in. Once the overcurrent

condition is removed, the regulator is allowed to enter

soft-start again. This helps minimize power dissipation

during a short-circuit condition. The MAX8632 allows flex-

ible sequencing and standby power management using

the

SHDN

and

STBY

inputs, which support all DDR

operating states.

The MAX8632 is available in a small 5mm

脳

5mm, 28-

pin thin QFN package.

Ordering Information

PART

MAX8632ETI+

TEMP RANGE PIN-PACKAGE

-40掳C to +85掳C 28 Thin QFN 5mm

脳

5mm

+Denotes

lead-free packaging.

Pin Configuration

OUT

BST

DL

DH

V

IN

TOP VIEW

21

V

DD

PGND1

GND

20

19

LX

18

17

16

15

14

13

12

REFIN

VTTI

VTT

PGND2

VTTR

VTTS

SS

22

23

24

25

26

27

28

1

TON

FB

SKIP

AV

DD

SHDN

TPO

MAX8632

11

10

9

8

Applications

DDR I and DDR II Memory Power Supplies

Desktop Computers

Notebooks and Desknotes

Graphic Cards

Game Consoles

RAID

Networking

2

OVP/UVP

3

REF

4

ILIM

5

POK1

6

POK2

7

STBY

5mm x 5mm THIN QFN

Typical Operating Circuit appears at end of data sheet.

Quick-PWM is a trademark of Maxim Integrated Products, Inc.

1

________________________________________________________________

Maxim Integrated Products

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

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

型号

版本

描述

厂商

下载
MAX800

英文版

Microprocessor Supervisory Circuits

MAX800
MAX801

英文版

8-Pin µP Supervisory Circuits with ±1.5% Re...

MAX801
MAX802

英文版

?P Reset IC with Watchdog and Battery Switchover

MAX802
MAX803

英文版

3-Pin Microprocessor Reset Circuits

MAX803
MAX804

英文版

3.0V/3.3V Microprocessor Supervisory Circuits

Maixm

MAX804
MAX804

英文版

3.0V/3.3V Microprocessor Supervisory Circuits

Maixm

MAX804
MAX804

英文版

3.0V/3.3V Microprocessor Supervisory Circuits

Maixm

MAX804
MAX805

英文版

?P Reset IC with Watchdog and Battery Switchover

MAX805
MAX806

英文版

3.0V/3.3V Microprocessor Supervisory Circuits

MAX806
MAX807

英文版

Full-Featured µP Supervisory Circuit with ±1.5&...

MAX807
MAX808

英文版

8-Pin レP Supervisory Circuits with 【1.5eset Accuracy

MAX808
MAX809

英文版

3-Pin Microprocessor Reset Monitors

ONSEMI

MAX809
MAX809

英文版

3-pin microprocessor resets

Philips

MAX809
MAX809

英文版

PIN CONFIGURATION

MAX809
MAX810

英文版

3-Pin Microprocessor Reset Monitors

ONSEMI

MAX810
MAX810

英文版

3-Pin Microprocessor Reset Monitors

ONSEMI [ON...

MAX810
MAX811

英文版

4-Pin レP Voltage Monitors with Manual Reset Input

MAX811
MAX811

英文版

4-Pin レP Voltage Monitors with Manual Reset Input

MAXIM [Max...

MAX811
MAX812

英文版

4-Pin μP Voltage Monitors with Manual Reset Input

Maixm

MAX812
MAX813

英文版

Low-Cost, uP Supervisory Circuits

MAX813

MAX8632 Datasheet

PDF预览

MAX8632相关型号PDF文件下载

您可能感兴趣的PDF文件资料

热门IC型号推荐

MAX8632 Datasheet

PDF预览

MAX8632相关型号PDF文件下载

您可能感兴趣的PDF文件资料

热门IC型号推荐

建议反馈

PDF纠错X