Rainbow-electronics MAX769 Manual do Utilizador descarregar pdf

________________General Description

The MAX769 is a complete buck/boost power supply

and monitoring system for two-way pagers or other low-

power digital communications devices. Few external

components are required. Included on-chip are:

• An 80mA output, synchronous-rectified, buck/boost

DC-DC converter with a digitally controlled +1.8V to

+4.9V output. The DC-DC converter is unique, since

it provides a regulated output for battery inputs that

are both less than and greater than the output volt-

age, without using transformers.

• Three low-noise linear-regulator outputs

• Three DAC-controlled comparators for software-

driven, 3-channel A/D conversion

• SPI™-compatible serial interface

• Reset and low-battery (LBO) warning outputs

• Charger for NiCd/NiMH, lithium battery, or storage

capacitor for RF PA power or system backup

• Two 1.8Ω (typical), serial-controlled, open-drain

MOSFET switches for beeper or vibrator drive

An evaluation kit for the MAX769 (MAX769EVKIT) is

available to aid in design and prototyping.

____________________________Features

♦ Regulated Step-Up/Step-Down Operation

♦ 80mA Output from 3 Cells

♦ 85% Efficiency

♦ 13µA Idle Mode™ (coast) Current

♦ Selectable Low-Noise PWM or Low-Current PFM

Operation

♦ PWM Operating Frequency Synchronized to

Seven Times an External Clock Source

♦ Operates at 270kHz with No External Clock

♦ Automatic Backup-Battery Switchover

________________________Applications

Two-Way Pagers

GPS Receivers

2 or 3-Cell Powered, Hand-Held Equipment

MAX769

2 or 3-Cell, Step-Up/Down,

Two-Way Pager System IC

________________________________________________________________

Maxim Integrated Products

MAX769

INPUT

2 OR 3 AA ALKALINE BATTERIES

1.5V TO 5.5V

BATT

LX2

OUT

PGND

REG2IN

OFS

REG2

OUTPUT 2

2.85V ANALOG

LOW-BATTERY

IN/OUT

REJECT

IN/OUT

SERIAL

I/O

1.8Ω

DRIVERS

A/D

INPUT

OPTIONAL

OUTPUT 1

3V LOGIC

OUTPUT 3

1V RECEIVER

TO RF PA

NiCd

BATTERY OR

STACK

REG1

REG3

NICD

AGNDREFFILT

LBI

LBO

RSIN

RSO

SCL

SD1

SD03

DR1

DR2

DR2IN

DRGND

CH0

SYNC

LX1

STORAGE

CAPACITOR

___________________________________________________Typical Operating Circuit

19-4771; Rev 1; 10/98

PART

MAX769EEI -40°C to +85°C

TEMP. RANGE PIN-PACKAGE

28 QSOP

Ordering Information

Idle Mode is a trademark of Maxim Integrated Products. SPI is a trademark of Motorola, Inc.

Pin Configuration appears at end of data sheet.

For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.

For small orders, phone 1-800-835-8769.

EVALUATION KIT MANUAL

FOLLOWS DATA SHEET

1 2 3 4 5 6 ... 15 16

Resumo do Conteúdo

Página 1 - Two-Way Pager System IC

________________General DescriptionThe MAX769 is a complete buck/boost power supplyand monitoring system for two-way pagers or other low-power digital

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MAX7692 or 3-Cell, Step-Up/Down, Two-Way Pager System IC10 ______________________________________________________________________________________7-Bit

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MAX7692 or 3-Cell, Step-Up/Down, Two-Way Pager System IC______________________________________________________________________________________ 11A fas

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MAX7692 or 3-Cell, Step-Up/Down, Two-Way Pager System IC12 ______________________________________________________________________________________Table

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MAX7692 or 3-Cell, Step-Up/Down, Two-Way Pager System IC______________________________________________________________________________________ 13All D

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MAX7692 or 3-Cell, Step-Up/Down, Two-Way Pager System IC14 ______________________________________________________________________________________Seria

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MAX7692 or 3-Cell, Step-Up/Down, Two-Way Pager System IC______________________________________________________________________________________ 15Appli

Página 8

MAX7692 or 3-Cell, Step-Up/Down, Two-Way Pager System IC16 ______________________________________________________________________________________Pin C

Página 9

MAX7692 or 3-Cell, Step-Up/Down, Two-Way Pager System IC2 _______________________________________________________________________________________ABSOL

Página 10

MAX7692 or 3-Cell, Step-Up/Down, Two-Way Pager System IC_______________________________________________________________________________________ 3ELECT

Página 11

VMAX7692 or 3-Cell, Step-Up/Down, Two-Way Pager System IC4 _______________________________________________________________________________________ELEC

Página 12

MAX7692 or 3-Cell, Step-Up/Down, Two-Way Pager System IC_______________________________________________________________________________________ 5ELECT

Página 13

MAX7692 or 3-Cell, Step-Up/Down, Two-Way Pager System IC6 _______________________________________________________________________________________Typic

Página 14

MAX7692 or 3-Cell, Step-Up/Down, Two-Way Pager System IC_______________________________________________________________________________________ 7Pin D

Página 15

MAX7692 or 3-Cell, Step-Up/Down, Two-Way Pager System IC8 _______________________________________________________________________________________LB0TO

Página 16

MAX7692 or 3-Cell, Step-Up/Down, Two-Way Pager System IC_______________________________________________________________________________________ 9_____

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Rainbow-electronics MAX769 Manual do Utilizador

Consulte online ou descarregue Manual do Utilizador para Sensores Rainbow-electronics MAX769. Rainbow Electronics MAX769 User Manual Manual do Utilizador

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