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MAX1718

Notebook CPU Step-Down Controller for Intel

Mobile Voltage Positioning (IMVP

II)

________________________________________________________________ Maxim Integrated Products 1

19-1960; Rev 3; 8/02

Ordering Information

†

Patent pending.

Quick-PWM is a trademark of Maxim Integrated Products.

IMVP-II is a trademark of Intel Corp.

5V INPUT

BATT 2V TO 28V

POWER-GOOD

OUTPUT

SKP/SDN

ILIM

OUTPUT

0.6V TO 1.75V

SHUTDOWN

V+

BST

GND

NEG

POS

VGATE

OVP

SUS

MUX CONTROL

SUSPEND

INPUT

DECODER

ZMODE

TIME

REF

TON

DUAL MODE VID

MUX INPUTS

MAX1718

Minimal Operating Circuit

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.

General Description

The MAX1718 step-down controller is intended for core

CPU DC-DC converters in notebook computers. It fea-

tures a dynamically adjustable output, ultra-fast transient

response, high DC accuracy, and high efficiency need-

ed for leading-edge CPU core power supplies. Maxim’s

proprietary Quick-PWM™ quick-response, constant-on-

time PWM control scheme handles wide input/output

voltage ratios with ease and provides 100ns “instant-on”

response to load transients while maintaining a relatively

constant switching frequency.

The output voltage can be dynamically adjusted through

the 5-bit digital-to-analog converter (DAC) over a 0.6V to

1.75V range. The MAX1718 has an internal multiplexer

that accepts three unique 5-bit VID DAC codes corre-

sponding to Performance, Battery, and Suspend modes.

Precision slew-rate control

†

provides “just-in-time” arrival

at the new DAC setting, minimizing surge currents to

and from the battery.

The internal DAC of the MAX1718B is synchronized to

the slew-rate clock for improved operation under

aggressive power management of newer chipsets and

operating systems that can make incomplete mode tran-

sitions.

A pair of complementary offset control inputs allows

easy compensation for IR drops in PC board traces or

creation of a voltage-positioned power supply. Voltage-

positioning modifies the load-transient response to

reduce output capacitor requirements and total system

power dissipation.

Single-stage buck conversion allows these devices to

directly step down high-voltage batteries for the highest

possible efficiency. Alternatively, two-stage conversion

(stepping down the 5V system supply instead of the bat-

tery) at a higher switching frequency allows the mini-

mum possible physical size.

The MAX1718 is available in a 28-pin QSOP package.

Applications

IMVP-II™ Notebook Computers

2-Cell to 4-Cell Li+ Battery to CPU Core Supply

Converters

5V to CPU Core Supply Converters

Features

♦ Quick-PWM Architecture

♦ ±1% V

OUT

Accuracy Over Line and Load

♦ 5-Bit On-Board DAC with Input Muxes

♦ Precision-Adjustable V

OUT

Slew Control

♦ 0.6V to 1.75V Output Adjust Range

♦ Precision Offset Control

♦ Supports Voltage-Positioned Applications

♦ 2V to 28V Battery Input Range

♦ Requires a Separate 5V Bias Supply

♦ 200/300/550/1000kHz Switching Frequency

♦ Over/Undervoltage Protection

♦ Drives Large Synchronous-Rectifier FETs

♦ 700µA (typ) I

Supply Current

♦ 2µA (typ) Shutdown Supply Current

♦ 2V ±1% Reference Output

♦ VGATE Blanking During Transition

♦ Small 28-Pin QSOP Package

Pin Configuration appears at end of data sheet.

PART TEMP RANGE PIN-PACKAGE

MAX1718EEI -40°C to +85°C 28 QSOP

MAX1718BEEI -40°C to +85°C 28 QSOP

1 2 3 4 5 6 ... 34 35

Resumo do Conteúdo

Página 1 - Features

MAX1718Notebook CPU Step-Down Controller for IntelMobile Voltage Positioning (IMVP-II)________________________________________________________________

Página 2 - ELECTRICAL CHARACTERISTICS

MAX1718Notebook CPU Step-Down Controller for IntelMobile Voltage Positioning (IMVP-II)10 _____________________________________________________________

Página 3

MAX1718Notebook CPU Step-Down Controller for IntelMobile Voltage Positioning (IMVP-II)________________________________________________________________

Página 4

MAX1718Notebook CPU Step-Down Controller for IntelMobile Voltage Positioning (IMVP-II)12 _____________________________________________________________

Página 5

MAX1718Notebook CPU Step-Down Controller for IntelMobile Voltage Positioning (IMVP-II)________________________________________________________________

Página 6

MAX1718Notebook CPU Step-Down Controller for IntelMobile Voltage Positioning (IMVP-II)14 _____________________________________________________________

Página 7 - MAX1718 toc07

MAX1718Notebook CPU Step-Down Controller for IntelMobile Voltage Positioning (IMVP-II)________________________________________________________________

Página 8 - MAX1718 toc16

MAX1718Notebook CPU Step-Down Controller for IntelMobile Voltage Positioning (IMVP-II)16 _____________________________________________________________

Página 9 - Pin Description

MAX1718Notebook CPU Step-Down Controller for IntelMobile Voltage Positioning (IMVP-II)________________________________________________________________

Página 10 - Pin Description (continued)

MAX1718Notebook CPU Step-Down Controller for IntelMobile Voltage Positioning (IMVP-II)18 _____________________________________________________________

Página 11

MAX1718Notebook CPU Step-Down Controller for IntelMobile Voltage Positioning (IMVP-II)________________________________________________________________

Página 12 - Detailed Description

MAX1718Notebook CPU Step-Down Controller for IntelMobile Voltage Positioning (IMVP-II)2 ______________________________________________________________

Página 13

MAX1718Notebook CPU Step-Down Controller for IntelMobile Voltage Positioning (IMVP-II)20 _____________________________________________________________

Página 14 - Voltage Offsets

MAX1718Notebook CPU Step-Down Controller for IntelMobile Voltage Positioning (IMVP-II)________________________________________________________________

Página 15 - Current-Limit Circuit

MAX1718Notebook CPU Step-Down Controller for IntelMobile Voltage Positioning (IMVP-II)22 _____________________________________________________________

Página 16 - MOSFET Gate Drivers (DH, DL)

MAX1718Notebook CPU Step-Down Controller for IntelMobile Voltage Positioning (IMVP-II)________________________________________________________________

Página 17 - DAC Inputs D0–D4

MAX1718Notebook CPU Step-Down Controller for IntelMobile Voltage Positioning (IMVP-II)24 _____________________________________________________________

Página 18

MAX1718Notebook CPU Step-Down Controller for IntelMobile Voltage Positioning (IMVP-II)________________________________________________________________

Página 19 - Using the ZMODE Mux

MAX1718Notebook CPU Step-Down Controller for IntelMobile Voltage Positioning (IMVP-II)26 _____________________________________________________________

Página 20

MAX1718Notebook CPU Step-Down Controller for IntelMobile Voltage Positioning (IMVP-II)________________________________________________________________

Página 21 - Table 5. DAC Mux Operation

MAX1718Notebook CPU Step-Down Controller for IntelMobile Voltage Positioning (IMVP-II)28 _____________________________________________________________

Página 22 - Output Overvoltage Protection

MAX1718Notebook CPU Step-Down Controller for IntelMobile Voltage Positioning (IMVP-II)________________________________________________________________

Página 23 - Output Undervoltage Shutdown

MAX1718Notebook CPU Step-Down Controller for IntelMobile Voltage Positioning (IMVP-II)________________________________________________________________

Página 24 - Design Procedure

MAX1718Notebook CPU Step-Down Controller for IntelMobile Voltage Positioning (IMVP-II)30 _____________________________________________________________

Página 25 - Output Capacitor Selection

MAX1718Notebook CPU Step-Down Controller for IntelMobile Voltage Positioning (IMVP-II)________________________________________________________________

Página 26 - MOSFET Power Dissipation

MAX1718Notebook CPU Step-Down Controller for IntelMobile Voltage Positioning (IMVP-II)32 _____________________________________________________________

Página 27 - Applications Information

MAX1718Notebook CPU Step-Down Controller for IntelMobile Voltage Positioning (IMVP-II)________________________________________________________________

Página 28 - High-Accuracy Current Limit

MAX1718Notebook CPU Step-Down Controller for IntelMobile Voltage Positioning (IMVP-II)34 _____________________________________________________________

Página 29

Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses arei

Página 30 - (5V Input) Applications

MAX1718Notebook CPU Step-Down Controller for IntelMobile Voltage Positioning (IMVP-II)4 ______________________________________________________________

Página 31 - PC Board Layout Guidelines

MAX1718Notebook CPU Step-Down Controller for IntelMobile Voltage Positioning (IMVP-II)________________________________________________________________

Página 32 - Chip Information

MAX1718Notebook CPU Step-Down Controller for IntelMobile Voltage Positioning (IMVP-II)6 ______________________________________________________________

Página 33

MAX1718Notebook CPU Step-Down Controller for IntelMobile Voltage Positioning (IMVP-II)________________________________________________________________

Página 34 - Pin Configuration

MAX1718Notebook CPU Step-Down Controller for IntelMobile Voltage Positioning (IMVP-II)8 ______________________________________________________________

Página 35 - Package Information

MAX1718Notebook CPU Step-Down Controller for IntelMobile Voltage Positioning (IMVP-II)________________________________________________________________

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