Rainbow-electronics MAX1712 Uživatelský manuál stáhnout pdf

General Description

The MAX1710/MAX1711 step-down controllers are

intended for core CPU DC-DC converters in notebook

computers. They feature a triple-threat combination of

ultra-fast transient 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 fre-

quency.

High DC precision is ensured by a 2-wire remote-sens-

ing scheme that compensates for voltage drops in both

the ground bus and supply rail. An on-board, digital-to-

analog converter (DAC) sets the output voltage in com-

pliance with Mobile Pentium II

CPU specifications.

The MAX1710 achieves high efficiency at a reduced

cost by eliminating the current-sense resistor found in

traditional current-mode PWMs. Efficiency is further

enhanced by an ability to drive very large synchronous-

rectifier MOSFETs.

Single-stage buck conversion allows these devices to

directly step down high-voltage batteries for the highest

possible efficiency. Alternatively, 2-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 MAX1710/MAX1711 are identical except that the

MAX1711 have 5-bit DACs and the MAX1710 has a 4-

bit DAC. Also, the MAX1711 has a fixed overvoltage

protection threshold at V

OUT

= 2.25V and undervoltage

protection at V

OUT

= 0.8V whereas the MAX1710 has

variable thresholds that track V

OUT

. The MAX1711 is

intended for applications where the DAC code may

change dynamically.

Applications

Notebook Computers

Docking Stations

CPU Core DC-DC Converters

Single-Stage (BATT to V

CORE)

Converters

Two-Stage (+5V to V

CORE

) Converters

Features

♦ Ultra-High Efficiency

♦ No Current-Sense Resistor (Lossless I

LIMIT

)

♦ Quick-PWM with 100ns Load-Step Response

♦ ±1% V

OUT

Accuracy over Line and Load

♦ 4-Bit On-Board DAC (MAX1710)

♦ 5-Bit On-Board DAC (MAX1711/MAX1712)

♦ 0.925V to 2V Output Adjust Range

(MAX1711/MAX1712)

♦ 2V to 28V Battery Input Range

♦ 200/300/400/550kHz Switching Frequency

♦ Remote GND and V

OUT

Sensing

♦ Over/Undervoltage Protection

♦ 1.7ms Digital Soft-Start

♦ Drive Large Synchronous-Rectifier FETs

♦ 2V ±1% Reference Output

♦ Power-Good Indicator

♦ Small 24-Pin QSOP Package

MAX1710/MAX1711/MAX1712

High-Speed, Digitally Adjusted

Step-Down Controllers for Notebook CPUs

________________________________________________________________ Maxim Integrated Products 1

19-4781; Rev 1; 7/00

Pin Configurations appear at end of data sheet.

Quick-PWM is a trademark of Maxim Integrated Products.

Mobile Pentium II is a registered trademark of Intel Corp.

-40°C to +85°C

PART

MAX1710EEG

TEMP. RANGE PIN-PACKAGE

24 QSOP

Ordering Information

MAX1711EEG

-40°C to +85°C 24 QSOP

SKIP

GND

BST

+5V INPUT

ILIM

GNDS

FBS

D4**

*MAX1710 ONLY

**MAX1711/MAX1712 ONLY

REF

PGND

MAX1710

MAX1711

MAX1712

V+

OVP* V

SHDN

OUTPUT

0.925V TO 2V

(MAX1711/MAX1712)

D/A

INPUTS

BATTERY

4.5V TO 28V

Minimal Operating Circuit

VALU

TIO

VAILA

BLE

For price, delivery, and to place orders, please contact Maxim Distribution at 1-888-629-4642,

or visit Maxim’s website at www.maxim-ic.com.

1 2 3 4 5 6 ... 27 28

MAX1710/MAX1711/MAX1712 1
MAX1710/MAX1711 14

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General DescriptionThe MAX1710/MAX1711 step-down controllers areintended for core CPU DC-DC converters in notebookcomputers. They feature a triple-thr

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MAX1710/MAX1711/MAX1712rent-mode PWMs while also avoiding the problemscaused by widely varying switching frequencies in con-ventional constant-on-time

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IBIAS= ICC+ f ✕(QG1+ QG2) = 15mA to 30mA (typ)where ICCis 600µA (typ), f is the switching frequency,and QG1and QG2are the MOSFET data sheet totalgate-

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MAX1710/MAX1711/MAX1712High-Speed, Digitally AdjustedStep-Down Controllers for Notebook CPUs12 _______________________________________________________

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MAX1710/MAX1711/MAX1712High-Speed, Digitally AdjustedStep-Down Controllers for Notebook CPUs__________________________________________________________

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MAX1710/MAX1711High-Speed, Digitally AdjustedStep-Down Controllers for Notebook CPUs14 _______________________________________________________________

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MAX1710/MAX1711/MAX1712High-Speed, Digitally AdjustedStep-Down Controllers for Notebook CPUs__________________________________________________________

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MAX1710/MAX1711/MAX1712______________________________________________________________________________________ 17High-Speed, Digitally AdjustedStep-Dow

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MAX1710/MAX1711/MAX1712High-Speed, Digitally AdjustedStep-Down Controllers for Notebook CPUs__________________________________________________________

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MAX1710/MAX1711/MAX1712High-Speed, Digitally AdjustedStep-Down Controllers for Notebook CPUs2 ________________________________________________________

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input voltage don’t exceed the package ratings or violatethe overall thermal budget. Choose a low-side MOSFET (Q2) that has the lowestpossible RDS(ON)

Strany 14 - MAX1710/MAX1711

fy factors that influence the turn-on and turn-off times.These factors include the internal gate resistance, gatecharge, threshold voltage, source ind

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MAX1710/MAX1711/MAX1712High-Speed, Digitally AdjustedStep-Down Controllers for Notebook CPUsminimize the energy transferred from inductor to capaci-to

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MAX1710/MAX1711/MAX1712High-Speed, Digitally AdjustedStep-Down Controllers for Notebook CPUs__________________________________________________________

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MAX1710/MAX1711/MAX1712High-Speed, Digitally AdjustedStep-Down Controllers for Notebook CPUsIRF7805OUTPUT+1.5V AT 15A10x220µF4VOS-CON2 x IRF7805CMPSH3

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MAX1710/MAX1711/MAX1712High-Speed, Digitally AdjustedStep-Down Controllers for Notebook CPUs__________________________________________________________

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• Keep the high-current paths short, especially at theground terminals. This practice is essential for stable,jitter-free operation.• Connect GND and

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MAX1710/MAX1711/MAX1712High-Speed, Digitally AdjustedStep-Down Controllers for Notebook CPUs__________________________________________________________

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MAX1710/MAX1711/MAX1712High-Speed, Digitally AdjustedStep-Down Controllers for Notebook CPUsMaxim cannot assume responsibility for use of any circuitr

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With respect to unloaded output voltageMAX1710/MAX1711/MAX1712High-Speed, Digitally AdjustedStep-Down Controllers for Notebook CPUs___________________

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MAX1710/MAX1711/MAX1712High-Speed, Digitally AdjustedStep-Down Controllers for Notebook CPUs4 ________________________________________________________

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MAX1710/MAX1711/MAX1712High-Speed, Digitally AdjustedStep-Down Controllers for Notebook CPUs__________________________________________________________

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MAX1710/MAX1711/MAX1712High-Speed, Digitally AdjustedStep-Down Controllers for Notebook CPUs6 ________________________________________________________

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10µs/divLOAD-TRANSIENT RESPONSE(WITH INTEGRATOR)VIN = 15V, VO = 1.6V, IO = 0A TO 7AA = VOUT, AC-COUPLED, 50mV/divB = INDUCTOR CURRENT, 5A/divABMAX1710

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MAX1710/MAX1711/MAX1712High-Speed, Digitally AdjustedStep-Down Controllers for Notebook CPUs8 ________________________________________________________

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MAX1710/MAX1711/MAX1712High-Speed, Digitally AdjustedStep-Down Controllers for Notebook CPUs__________________________________________________________

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Procházejte online nebo si stáhněte Uživatelský manuál pro Senzory Rainbow-electronics MAX1712. Rainbow Electronics MAX1712 User Manual Uživatelská příručka

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