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Maxim Integrated Semiconductor Electronic Components Datasheet

MAX847 Datasheet

1-Cell / Step-Up Two-Way Pager System IC

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


Maxim Integrated Semiconductor Electronic Components Datasheet

MAX847 Datasheet

1-Cell / Step-Up Two-Way Pager System IC

No Preview Available !

1-Cell, Step-Up
Two-Way Pager System IC
ABSOLUTE MAXIMUM RATINGS
BATT, OUT, NICD, LBO, RSO to AGND...................-0.3V to +6V
REG1, OFS, REG2, REF, R2IN to AGND ...-0.3V to (OUT + 0.3V)
SCL, SDO, SDI, CS , SYNC, FILT, DR2IN,
CH0, LBI, RSIN, RUN to AGND ...................-0.3V to (REG1 + 0.3V)
REG3 .......................................................-0.3V to (REG2 + 0.3V)
DR1, DR2 to DRGND ...............................-0.3V to (BATT + 0.3V)
PGND, DRGND to AGND ......................................-0.3V to +0.3V
LX1 to PGND .............................................-0.3V to (OUT + 0.3V)
Continuous Power Dissipation (TA = +70°C)
28-Pin QSOP (derate 8mW/°C above +70°C) .............640mW
Operating Temperature Range ...........................-40°C to +85°C
Junction Temperature ......................................................+150°C
Storage Temperature Range .............................-65°C to +165°C
Lead Temperature (soldering, 10sec) .............................+300°C
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
(OUT = 3.0V, BATT = 1.2V, NICD = 3.6V, TA = -40°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C.) (Note 1)
PARAMETER
CONDITIONS
MIN TYP MAX UNITS
GENERAL PERFORMANCE
BATT Typical Operating Range
(Note 2)
Run or Coast Mode
0.8
OUT x
0.8
V
BATT Minimum Start-Up Voltage
(Note 3)
TA = +25°C
0.9 1.1
V
Coast Mode Supply Current (Note 4) REG2, REG3 and CH DAC off, VOUT = 2.8V
Run Mode Supply Current (Note 4) REG2, REG3 and CH DAC on
13 25 µA
875 1350 µA
BATT Supply Current (Note 5)
Coast mode
0.5 2 µA
NICD Input Current, Standby
(Note 6)
Charger and Backup Modes off, NICD = 3.6V
1.2 3 µA
NICD Input Supply Current, Backup
(Note 7)
Backup mode, NICD = 3.6V, OUT = 3V
20 40 µA
NICD Input Current, Power Fail
(Note 8)
Charger and Backup Modes off,
BATT = 0V and OUT = 0V
1.2 3 µA
REG2 Supply Current (Note 4)
Incremental supply current when on
50 µA
REG3 Supply Current (Note 4)
Incremental supply current when on
20 µA
CH DAC Supply Current (Note 4)
Incremental supply current when on
30 µA
Reference Voltage
DR1, DR2 On-Resistance
DR1, DR2 Leakage Current
SDO Output Low
SDO Output High
Logic Input Level Low
IREF = 0 to 20µA, OUT = 1.8V to 4.9V
IDR = 120mA
TA = +25°C
TA = -40°C to +85°C
VDR = 5V
ISDO = 100µA
ISDO = -100µA, from REG1
Includes CS, SDI, SCL, DR2IN, SYNC, and RUN
-1.5%
1.28
1.8
1
VREG1
- 0.2
0.4
1.5%
2.8
3.6
250
200
V
nA
mV
V
V
Logic Input Level High
Includes CS, SDI, SCL, DR2IN, SYNC, and RUN
VREG1
- 0.4
V
Logic Input Current
Logic Input = 0 to 3.3V; includes CS, SDI, SCL,
DR2IN, SYNC, and RUN
-1
1 µA
SERIAL-INTERFACE TIMING SPECIFICATIONS (Note 9)
SCL Maximum Clock Rate
50% duty cycle
5 MHz
SDI Setup Time, tDS
SDI Hold Time, tDH
100 ns
50 ns
2 _______________________________________________________________________________________


Part Number MAX847
Description 1-Cell / Step-Up Two-Way Pager System IC
Maker Maxim
Total Page 18 Pages
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