Datasheet > MAX847

MAX847

更新时间： 2024-11-19 22:55:11

品牌	Logo	应用领域
美信 - MAXIM		/
页数	文件大小	规格书
18页	168K
描述
1-Cell, Step-Up Two-Way Pager System IC

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数据手册

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MAX847 数据手册

19-1349; Rev 1a; 10/98

1 -Ce ll, S t e p -Up

Tw o -Wa y P a g e r S ys t e m IC

MAX847

________________Ge n e ra l De s c rip t io n

____________________________Fe a t u re s

♦ 80mA Output from 1 Cell at 90% Efficiency

♦ 13µA Idle Mode™ (coast) Current

The MAX847 is a complete power-supply and monitor-

ing system for two-way pagers or other low-power digi-

tal communications devices. It requires few external

components. Included on-chip are:

♦ Selectable Low-Noise PWM or Low-Current

•

A 1-cell input, 80mA output, synchronous-rectified

boost DC-DC regulator with a digitally controlled

+1.8V to +4.9V output

Operation

♦ PWM Operating Frequency Synchronized to

Seven Times an External Clock Source

•

Three low-noise linear-regulator outputs

♦ Operates at 270kHz with No External Clock

♦ Automatic Backup-Battery Switchover

Thre e DAC-c ontrolle d c omp a ra tors for s oftwa re -

driven 3-channel A/D conversion

•

SPI™-compatible serial interface

Ord e rin g In fo rm a t io n

Reset and low-battery (LBO) warning outputs

PART

TEMP. RANGE

PIN-PACKAGE

Charger for NiCd, NiMH, lithium battery, or storage

capacitor for RF PA power or system backup

MAX847EEI

-40°C to +85°C

28 QSOP

•

Two 1.8Ω (typ ic a l) s e ria l-c ontrolle d op e n-d ra in

MOSFET switches

________________________Ap p lic a t io n s

Two-Way Pagers

An evaluation kit for the MAX847 (MAX847EVKIT) is

available to aid in design and prototyping.

GPS Receivers

1-Cell Powered Hand-Held Equipment

Pin Configuration appears at end of data sheet.

____________________________________________________Typ ic a l Op e ra t in g Circ u it

INPUT

SINGLE AA

ALKALINE BATTERY

0.8V TO 1.8V

BATT

LOW-BATTERY

LBI

LBO

LX1

OUT

IN/OUT

RSIN

RSO

RESET

IN/OUT

PGND

REG2IN

SERIAL

I/O

SCL

SDI

SDO

MAX847

OFS

DR1

DR2

DR2IN

1.8Ω

DRIVERS

OUTPUT 2

2.85V ANALOG

REG2

REG1

DRGND

OUTPUT 1

3V LOGIC

RUN

CH0

COAST

OUTPUT 3

1V RECEIVER

REG3

NICD

A/D INPUT

OPTIONAL

TO RF PA

SYNC

FILT

REF

AGND

NiCd BATTERY STACK

STORAGE CAPACITOR

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

________________________________________________________________ Maxim Integrated Products

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.

12 3 4 5 6 7...18

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与MAX847相关器件

型号	品牌	获取价格	描述	数据表
MAX847EEI	MAXIM	获取价格	1-Cell, Step-Up Two-Way Pager System IC
MAX847EEI+T	MAXIM	获取价格	Power Supply 28-Pin QSOP T/R
MAX847EEI-T	MAXIM	获取价格	Power Supply Management Circuit, Adjustable, 1 Channel, PDSO28, 0.150 INCH, 0.025 INCH PIT
MAX847EVKIT	MAXIM	获取价格	Evaluation Kit for the MAX847
MAX848	MAXIM	获取价格	1-Cell to 3-Cell, High-Power, Low-Noise, Step-Up DC-DC Converters
MAX848	ADI	获取价格	1节至3节电池、大功率、低噪声、升压型DC-DC转换器
MAX848C/D	MAXIM	获取价格	Switching Regulator, Voltage-mode, 0.5A, 300kHz Switching Freq-Max, CMOS, DIE
MAX848CSE	MAXIM	获取价格	Analog IC
MAX848ESE	MAXIM	获取价格	1-Cell to 3-Cell, High-Power, Low-Noise, Step-Up DC-DC Converters
MAX848ESE+	MAXIM	获取价格	暂无描述

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