Rainbow-electronics MAX1775 Bedienungsanleitung PDF herunterladen

General Description

The MAX1775 is a dual, step-down DC-DC converter

that generates both the main (+3.3V at over 2A) and

core (+1.8V at up to 1.5A) supplies for a complete

power solution for PDAs, subnotebooks, and other

hand-held devices. The main output is adjustable from

+1.25V to +5.5V. The core output is adjustable from 1V

to 5V. Both switching converters operate at up to

1.25MHz for small external components and use syn-

chronous rectifiers to achieve efficiencies up to 95%.

Operation with up to 100% duty cycle provides the low-

est possible dropout voltage to extend useful battery

life.

The MAX1775 accepts inputs from +2.7V up to +28V,

allowing use with many popular battery configurations as

well as AC-DC wall adapters. Digital soft-start reduces

battery current surges at power-up. Both the main and

core converters have separate shutdown inputs. The

MAX1775 comes in a small 16-pin QSOP package.

The MAX1775 evaluation kit is available to help reduce

design time.

________________________Applications

Hand-Held Computers

PDAs

Internet Access Tablets

POS Terminals

Subnotebooks

Features

♦ Dual, High-Efficiency, Synchronous Rectified

Step-Down Converter

♦ Main Power

Adjustable from +1.25V to +5.5V

Over 2A Load Current

Up to 95% Efficiency

♦ Core Power

Adjustable from 1V to 5V

Internal Switches

Up to 1.5A Load Current

Up to 92% Efficiency

♦ 100% (max) Duty Cycle

♦ Up to 1.25MHz Switching Frequency

♦ Input Voltage Range from +2.7V to +28V

♦ 170µA Quiescent Current

♦ 5µA Shutdown Current

♦ Digital Soft-Start

♦ Independent Shutdown Inputs

MAX1775

Dual-Output Step-Down

DC-DC Converter for PDA/Palmtop Computers

________________________________________________________________ Maxim Integrated Products 1

SHDNM LXC

INC

GND

FBC

CS-

CS+

FBM

REF

TOP VIEW

MAX1775

16 QSOP

SHDNC

PGND

NDRV

CVL

PDRV

CVH

Pin Configuration

19-1811; Rev 1; 8/01

EVA

LUA

TIO

KIT

AVA

ILA

Ordering Information

PART TEMP. RANGE PIN-PACKAGE

MAX1775EEE -40°C to +85°C 16 QSOP

SHDNM

IN 2.7V TO 5.5V (28V IN CASCADE)

CVH

CORE

1.8V

1.5A

MAIN

3.3V

OVER 2A

SHDNC

OFF

NDRV

CS+

CS-

INC

FBM

LXC

FBC

CVL

REF

PGND

GND

PDRV

MAX1775

Typical 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.

1 2 3 4 5 6 ... 14 15

Dual-Output Step-Down 1
QSOP.EPS 15

Inhaltsverzeichnis

Seite 1 - Dual-Output Step-Down

General DescriptionThe MAX1775 is a dual, step-down DC-DC converterthat generates both the main (+3.3V at over 2A) andcore (+1.8V at up to 1.5A) suppl

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MAX1775Dual-Output Step-Down DC-DC Converter for PDA/Palmtop Computers10 _____________________________________________________________________________

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MAX1775Dual-Output Step-Down DC-DC Converter for PDA/Palmtop Computers________________________________________________________________________________

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MAX1775Dual-Output Step-Down DC-DC Converter for PDA/Palmtop Computers________________________________________________________________________________

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MAX1775Dual-Output Step-Down DC-DC Converter for PDA/Palmtop Computers14 _____________________________________________________________________________

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Dual-Output Step-Down DC-DC Converter for PDA/Palmtop ComputersMaxim cannot assume responsibility for use of any circuitry other than circuitry entire

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MAX1775Dual-Output Step-Down DC-DC Converter for PDA/Palmtop Computers2 ______________________________________________________________________________

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MAX1775Dual-Output Step-Down DC-DC Converter for PDA/Palmtop Computers________________________________________________________________________________

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MAX1775Dual-Output Step-Down DC-DC Converter for PDA/Palmtop Computers4 ______________________________________________________________________________

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MAX1775Dual-Output Step-Down DC-DC Converter for PDA/Palmtop Computers________________________________________________________________________________

Seite 12

10001 10 100 1000 10,000MAIN OUTPUT EFFICIENCY vs. LOAD20MAX1775 toc01LOAD (mA)EFFICIENCY (%)4060807050301090VIN = +12VVIN = +15VVIN = +18V VIN = +5V

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MAX1775Dual-Output Step-Down DC-DC Converter for PDA/Palmtop Computers________________________________________________________________________________

Seite 14

MAX1775Dual-Output Step-Down DC-DC Converter for PDA/Palmtop Computers8 ______________________________________________________________________________

Seite 15 - QSOP.EPS

MAX1775Dual-Output Step-Down DC-DC Converter for PDA/Palmtop Computers________________________________________________________________________________

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Rainbow-electronics MAX1775 Bedienungsanleitung

Stöbern Sie online oder laden Sie Bedienungsanleitung nach Sensoren Rainbow-electronics MAX1775 herunter. Rainbow Electronics MAX1775 User Manual Benutzerhandbuch

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