MAX847 Maxim, MAX847 Datasheet
MAX847
Manufacturer Part Number
MAX847
Description
1-Cell / Step-Up Two-Way Pager System IC
Manufacturer
Maxim
Datasheet
1.MAX847.pdf
(18 pages)
Available stocks
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Price
Part Number:
MAX847EEI
Manufacturer:
MAXIM/美信
Quantity:
20 000
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:
• A 1-cell input, 80mA output, synchronous-rectified
• Three low-noise linear-regulator outputs
• Three DAC-controlled comparators for software-
• SPI™-compatible serial interface
• Reset and low-battery (LBO) warning outputs
• Charger for NiCd, NiMH, lithium battery, or storage
• Two 1.8
An evaluation kit for the MAX847 (MAX847EVKIT) is
available to aid in design and prototyping.
Pin Configuration appears at end of data sheet.
____________________________________________________Typical Operating Circuit
________________General Description
Idle Mode is a trademark of Maxim Integrated Products. SPI is a trademark of Motorola, Inc.
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.
19-1349; Rev 1a; 10/98
boost DC-DC regulator with a digitally controlled
+1.8V to +4.9V output
driven 3-channel A/D conversion
capacitor for RF PA power or system backup
MOSFET switches
(typical) serial-controlled open-drain
________________________________________________________________ Maxim Integrated Products
RUN
LOW-BATTERY
ALKALINE BATTERY
A/D INPUT
OPTIONAL
DRIVERS
0.8V TO 1.8V
IN/OUT
IN/OUT
SERIAL
RESET
SINGLE AA
1.8
COAST
I/O
INPUT
LBI
LBO
RSIN
RSO
CS
SCL
SDI
SDO
DR1
DR2
DR2IN
DRGND
RUN
CH0
SYNC
FILT
Two-Way Pager System IC
MAX847
BATT
REF
____________________________Features
________________________Applications
80mA Output from 1 Cell at 90% Efficiency
13µA Idle Mode™ (coast) Current
Selectable Low-Noise PWM or Low-Current
Operation
PWM Operating Frequency Synchronized to
Seven Times an External Clock Source
Operates at 270kHz with No External Clock
Automatic Backup-Battery Switchover
MAX847EEI
AGND
PART
REG2IN
Two-Way Pagers
GPS Receivers
1-Cell Powered Hand-Held Equipment
PGND
REG2
REG1
REG3
NICD
OUT
OFS
LX1
NiCd BATTERY STACK
STORAGE CAPACITOR
1-Cell, Step-Up
TEMP. RANGE
-40°C to +85°C
Ordering Information
OR
OUTPUT 2
2.85V ANALOG
OUTPUT 1
3V LOGIC
OUTPUT 3
1V RECEIVER
TO RF PA
28 QSOP
PIN-PACKAGE
1
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