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MAX471ESA

P1-P3P4-P6P7-P9P10-P12P13-P13
Not Recommended for New Designs
This product was manufactured for Maxim by an outside wafer foundry
using a process that is no longer available. It is not recommended for
new designs. The data sheet remains available for existing users.
A Maxim replacement or an industry second-source may be available.
Please see the QuickView data sheet for this part or contact technical
support for assistance.
For further information,
contact Maxim’s Applications Tech Support.
_______________General Description
The MAX471/MAX472 are complete, bidirectional, high-
side current-sense amplifiers for portable PCs, tele-
phones, and other systems where battery/DC
power-line monitoring is critical. High-side power-line
monitoring is especially useful in battery-powered sys-
tems, since it does not interfere with the ground paths
of the battery chargers or monitors often found in
“smart” batteries.
The MAX471 has an internal 35mΩ current-sense resis-
tor and measures battery currents up to ±3A. For appli-
cations requiring higher current or increased flexibility,
the MAX472 functions with external sense and gain-set-
ting resistors. Both devices have a current output that
can be converted to a ground-referred voltage with a
single resistor, allowing a wide range of battery volt-
ages and currents.
An open-collector SIGN output indicates current-flow
direction, so the user can monitor whether a battery is
being charged or discharged. Both devices operate
from 3V to 36V, draw less than 100µA over tempera-
ture, and include a 18µA max shutdown mode.
________________________Applications
Portable PCs:
Notebooks/Subnotebooks/Palmtops
Smart Battery Packs
Cellular Phones
Portable Phones
Portable Test/Measurement Systems
Battery-Operated Systems
Energy Management Systems
____________________________Features
♦ Complete High-Side Current Sensing
♦ Precision Internal Sense Resistor (MAX471)
♦ 2% Accuracy Over Temperature
♦ Monitors Both Charge and Discharge
♦ 3A Sense Capability with Internal Sense Resistor
(MAX471)
♦ Higher Current-Sense Capability with External
Sense Resistor (MAX472)
♦ 100µA Max Supply Current
♦ 18µA Max Shutdown Mode
♦ 3V to 36V Supply Operation
♦ 8-Pin DIP/SO Packages
______________Ordering Information
MAX471/MAX472
Precision, High-Side
Current-Sense Amplifiers
________________________________________________________________
Maxim Integrated Products
1
1
2
3
4
8
7
6
5
OUT
RS-
RS-
SIGNGND
RS+
RS+
SHDN
MAX471
DIP/SO
TOP VIEW
_________________Pin Configurations
MAX471
RS+
RS+ RS-
RS-
SIGN
OUT
GNDSHDN
3V
TO
36V
100k
I
LOAD
2000
2k
I
LOAD
TO
LOAD or CHARGER
LOGIC
SUPPLY
DISCHARGE/CHARGE
V
OUT
(1V/A)
__________Typical Operating Circuit
19-0335; Rev 2; 12/96
PART
MAX471CPA
MAX471CSA
MAX471EPA -40°C to +85°C
0°C to +70°C
0°C to +70°C
TEMP. RANGE PIN-PACKAGE
8 Plastic DIP
8 SO
8 Plastic DIP
MAX471ESA -40°C to +85°C 8 SO
MAX472CPA
0°C to +70°C 8 Plastic DIP
MAX472CSA 0°C to +70°C 8 SO
MAX472EPA -40°C to +85°C 8 Plastic DIP
MAX472ESA -40°C to +85°C 8 SO
MAX472 Pin Configuration continued on last page.
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800
MAX471/MAX472
Precision, High-Side
Current-Sense Amplifiers
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS—MAX471
(RS+ = +3V to +36V, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at T
A
= +25°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.
Supply Voltage, RS+, RS-, V
CC
to GND....................-0.3V, +40V
RMS Current, RS+ to RS- (MAX471 only)..........................±3.3A
Peak Current, (RS+ to RS-) ......................................see Figure 5
Differential Input Voltage, RG1 to RG2 (MAX472 only) .....±0.3V
Voltage at Any Pin Except SIGN
MAX471 only...........................................-0.3V to (RS+ - 0.3V)
MAX472 only ..........................................-0.3V to (V
CC
+ 0.3V)
Voltage at SIGN......................................................-0.3V to +40V
Current into SHDN, GND, OUT, RG1, RG2, V
CC
................±50mA
Current into SIGN.................................................+10mA, -50mA
Continuous Power Dissipation (T
A
= +70°C)
MAX471 (Note 1):
Plastic DIP (derate 17.5mW/°C above +70°C) ..................1.4W
SO (derate 9.9mW/°C above +70°C).............................791mW
MAX472 :
Plastic DIP (derate 9.09mW/°C above +70°C) ..............727mW
SO (derate 5.88mW/°C above +70°C)...........................471mW
Operating Temperature Ranges
MAX47_C_A........................................................0°C to +70°C
MAX47_E_A.....................................................-40°C to +85°C
Junction Temperature Range............................-60°C to +150°C
Storage Temperature Range.............................-60°C to +160°C
Lead Temperature (soldering, 10sec).............................+300°C
V
SHDN
= 2.4V
I
LOAD
= 0A, excludes I
SIGN
V
SHDN
= 0V
V
SHDN
= 2.4V; V
CC
= 3V to 20V
V
SIGN
= 0.3V
V
SIGN =
36V
I
LOAD
= 30mA,
RS+ = 10V
MAX471E
MAX471C
I
LOAD
= 0A,
RS+ = 10V
I
LOAD
= 1A,
RS+ = 10V
3V ≤ RS+ ≤ 36V, I
LOAD
= 1A
CONDITIONS
V0V
RS+
- 1.5V
OUT
OUT Output Voltage Range
µA1.0I
IH
SHDN Input High Current
V2.4V
IH
SHDN Input High Voltage
µA1.0I
IL
SHDN Input Low Current
V0.3V
IL
SHDN Input Low Voltage
µA1.5 18.0I
RS+(SHDN)
Shutdown Supply Current
mA0.1I
OL
SIGN Sink Current
µA1.0SIGN Output Leakage Current
mA
±4.0 ±6.0
SIGN Threshold (I
LOAD
required
to switch SIGN)
%/V0.1PSRRPower-Supply Rejection Ratio
A
RMS
±3I
LOAD
Sense Current
V
50 113I
RS+
336V
RS+
Supply Voltage
Supply Current
µA
±3.0
Low-Level OUT Error
±2.5
µA
3.0
No-Load OUT Error
mΩ35 70R
SENSE
Sense Resistor
0.490 0.500 0.510
mA/A
0.4875 0.500 0.5125
I
OUT
/
I
LOAD
Current-Sense Ratio
2.5
UNITSMIN TYP MAXSYMBOLPARAMETER
OUT Output Resistance R
OUT
I
LOAD
= 3.0A, V
OUT
= 0V to (V
RS+
- 1.5V) 13 MΩ
OUT Rise, Fall Time t
R
, t
F
I
LOAD
= 50mA to 3.0A, R
OUT
= 2kΩ,
C
OUT
= 50pF, 10% to 90%
4 µs
OUT Settling Time to 1%
of Final Value
t
s
I
LOAD
= 100mA to 3.0A, R
OUT
= 2kΩ,
C
OUT
= 50pF
15 µs
MAX471C
MAX471C
MAX471C
MAX471E
MAX471E
MAX471E
±7.0
µA
Note 1: Due to special packaging considerations, MAX471 (DIP, SO) has a higher power dissipation rating than the MAX472. RS+
and RS- must be soldered to large copper traces to achieve this dissipation rating.
P1-P3P4-P6P7-P9P10-P12P13-P13

MAX471ESA

Mfr. #:
Buy MAX471ESA
Manufacturer:
Maxim Integrated
Description:
Current Sense Amplifiers
Lifecycle:
New from this manufacturer.
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