Rainbow-electronics MAX1717 Manual do Utilizador descarregar pdf (Página 1)

General Description

The MAX1717 step-down controller is intended for core

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

tures a dynamically adjustable output, ultra-fast tran-

sient response, high DC accuracy, and high efficiency

needed 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)

inputs over a 0.925V to 2V range. A unique feature of

the MAX1717 is an internal multiplexer (mux) that

accepts two 5-bit DAC settings with only five digital

input pins. Output voltage transitions are accomplished

with a proprietary precision slew-rate control

†

that mini-

mizes surge currents to and from the battery while

guaranteeing “just-in-time” arrival at the new DAC setting.

High DC precision is enhanced by a two-wire remote-

sensing scheme that compensates for voltage drops in

the ground bus and output voltage rail. Alternatively,

the remote-sensing inputs can be used together with

the MAX1717’s high DC accuracy to implement a volt-

age-positioned circuit that modifies the load-transient

response to reduce output capacitor requirements and

full-load 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

battery) at a higher switching frequency allows the mini-

mum possible physical size.

The MAX1717 is available in a 24-pin QSOP package.

Applications

Notebook Computers with SpeedStep™ or

Other Dynamically Adjustable Processors

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 Mux

♦ Precision-Adjustable V

OUT

Slew Control

♦ 0.925V to 2V Output Adjust Range

♦ 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 Transition-Complete Indicator

♦ Small 24-Pin QSOP Package

MAX1717

Dynamically Adjustable, Synchronous

Step-Down Controller for Notebook CPUs

________________________________________________________________ Maxim Integrated Products 1

19-1636; Rev 2; 2/02

PART

MAX1717EEG -40°C to +85°C

TEMP RANGE PIN-PACKAGE

24 QSOP

Ordering Information

Pin Configuration appears at end of data sheet.

†

Patent pending.

Quick-PWM is a trademark of Maxim Integrated Products.

SpeedStep is a trademark of Intel Corp.

TIME

VGATE

BST

+5V INPUT

ILIM

GNDS

FBS

REF

TON

GND

MAX1717

V+

SKP/SDN

OUTPUT

0.925V TO 2V

DAC

INPUTS

BATTERY

2.5V TO 28V

A/B

Minimal Operating Circuit

EVALUATION KIT

AVAILABLE

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.

1 2 3 4 5 6 ... 32 33

Resumo do Conteúdo

Página 1 - Minimal Operating Circuit

General DescriptionThe MAX1717 step-down controller is intended for coreCPU DC-DC converters in notebook computers. It fea-tures a dynamically adjusta

Página 2 - ELECTRICAL CHARACTERISTICS

MAX1717Dynamically Adjustable, Synchronous Step-Down Controller for Notebook CPUs10 __________________________________________________________________

Página 3

MAX1717Dynamically Adjustable, Synchronous Step-Down Controller for Notebook CPUs_____________________________________________________________________

Página 4

MAX1717Dynamically Adjustable, SynchronousStep-Down Controller for Notebook CPUs12 ___________________________________________________________________

Página 5

MAX1717Dynamically Adjustable, Synchronous Step-Down Controller for Notebook CPUs_____________________________________________________________________

Página 6

MAX1717Dynamically Adjustable, Synchronous Step-Down Controller for Notebook CPUs14 __________________________________________________________________

Página 7

MAX1717Dynamically Adjustable, Synchronous Step-Down Controller for Notebook CPUs_____________________________________________________________________

Página 8

MAX1717Dynamically Adjustable, Synchronous Step-Down Controller for Notebook CPUs16 __________________________________________________________________

Página 9

MAX1717Dynamically Adjustable, Synchronous Step-Down Controller for Notebook CPUs_____________________________________________________________________

Página 10 - Pin Description

MAX1717Dynamically Adjustable, Synchronous Step-Down Controller for Notebook CPUs18 __________________________________________________________________

Página 11 - Pin Description (continued)

MAX1717Dynamically Adjustable, Synchronous Step-Down Controller for Notebook CPUs_____________________________________________________________________

Página 12

MAX1717Dynamically Adjustable, Synchronous Step-Down Controller for Notebook CPUs2 ___________________________________________________________________

Página 13 - International

MAX1717Dynamically Adjustable, Synchronous Step-Down Controller for Notebook CPUs20 __________________________________________________________________

Página 14 - Detailed Description

MAX1717Dynamically Adjustable, Synchronous Step-Down Controller for Notebook CPUs_____________________________________________________________________

Página 15 - Figure 2. Functional Diagram

MAX1717Dynamically Adjustable, Synchronous Step-Down Controller for Notebook CPUs22 __________________________________________________________________

Página 16 - Integrator Amplifiers

MAX1717Dynamically Adjustable, Synchronous Step-Down Controller for Notebook CPUs_____________________________________________________________________

Página 17

MAX1717Dynamically Adjustable, Synchronous Step-Down Controller for Notebook CPUs24 __________________________________________________________________

Página 18 - MOSFET Gate Drivers (DH, DL)

MAX1717Dynamically Adjustable, Synchronous Step-Down Controller for Notebook CPUs_____________________________________________________________________

Página 19 - DAC Inputs D0–D4

MAX1717Dynamically Adjustable, Synchronous Step-Down Controller for Notebook CPUs26 __________________________________________________________________

Página 20 - Internal Mux

MAX1717Dynamically Adjustable, Synchronous Step-Down Controller for Notebook CPUs_____________________________________________________________________

Página 21 - B-Mode DAC Codes

MAX1717Dynamically Adjustable, Synchronous Step-Down Controller for Notebook CPUs28 __________________________________________________________________

Página 22

MAX1717Dynamically Adjustable, Synchronous Step-Down Controller for Notebook CPUs_____________________________________________________________________

Página 23 - Output Undervoltage Shutdown

MAX1717Dynamically Adjustable, Synchronous Step-Down Controller for Notebook CPUs_____________________________________________________________________

Página 24 - Design Procedure

MAX1717Dynamically Adjustable, Synchronous Step-Down Controller for Notebook CPUs30 __________________________________________________________________

Página 25 - Output Capacitor Selection

MAX1717Dynamically Adjustable, Synchronous Step-Down Controller for Notebook CPUs_____________________________________________________________________

Página 26 - Input Capacitor Selection

MAX1717Dynamically Adjustable, Synchronous Step-Down Controller for Notebook CPUs32 __________________________________________________________________

Página 27 - MOSFET Power Dissipation

MAX1717Dynamically Adjustable, Synchronous Step-Down Controller for Notebook CPUsMaxim cannot assume responsibility for use of any circuitry other tha

Página 28 - Application Issues

MAX1717Dynamically Adjustable, Synchronous Step-Down Controller for Notebook CPUs4 ___________________________________________________________________

Página 29 - Above 2V

MAX1717Dynamically Adjustable, Synchronous Step-Down Controller for Notebook CPUs_____________________________________________________________________

Página 30 - PC Board Layout Guidelines

MAX1717Dynamically Adjustable, Synchronous Step-Down Controller for Notebook CPUs6 ___________________________________________________________________

Página 31 - Layout Procedure

MAX1717Dynamically Adjustable, Synchronous Step-Down Controller for Notebook CPUs_____________________________________________________________________

Página 32 - Chip Information

MAX1717Dynamically Adjustable, Synchronous Step-Down Controller for Notebook CPUs8 ___________________________________________________________________

Página 33 - Package Information

MAX1717Dynamically Adjustable, Synchronous Step-Down Controller for Notebook CPUs_____________________________________________________________________

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