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19-3285; Rev 1; 5/05
EVAALVUAAITLIAOBNLKEITS
High-Side Power and
Current Monitors
General Description
The MAX4210/MAX4211 low-cost, low-power, high-side
power/current monitors provide an analog output volt-
age proportional to the power consumed by a load by
multiplying load current and source voltage. The
MAX4210/MAX4211 measure load current by using a
high-side current-sense amplifier, making them espe-
cially useful in battery-powered systems by not interfer-
ing with the ground path of the load.
The MAX4210 is a small, simple 6-pin power monitor
intended for limited board space applications. The
MAX4210A/B/C integrate an internal 25:1 resistor-divider
network to reduce component count. The MAX4210D/E/F
use an external resistor-divider network for greater design
flexibility.
The MAX4211 is a full-featured current and power mon-
itor. The device combines a high-side current-sense
amplifier, 1.21V bandgap reference, and two compara-
tors with open-drain outputs to make detector circuits
for overpower, overcurrent, and/or overvoltage condi-
tions. The open-drain outputs can be connected to
potentials as high as 28V, suitable for driving high-side
switches for circuit-breaker applications.
Both the MAX4210/MAX4211 feature three different cur-
rent-sense amplifier gain options: 16.67V/V, 25.00V/V, and
40.96V/V. The MAX4210 is available in 3mm x 3mm, 6-pin
TDFN and 8-pin µMAX® packages and the MAX4211 is
available in 4mm x 4mm, 16-pin thin QFN and 16-pin
TSSOP packages. Both parts are specified for the -40°C
to +85°C extended operating temperature range.
Applications
Overpower Circuit Breakers
Smart Battery Packs/Chargers
Smart Peripheral Control
Short-Circuit Protection
Power-Supply Displays
Measurement Instrumentation
Baseband Analog Multipliers
VGA Circuits
Power-Level Detectors
µMAX is a registered trademark of Maxim Integrated Products, Inc.
Pin Configurations and Selector Guide appear at end of data
sheet.
Features
o Real-Time Current and Power Monitoring
o ±1.5% (max) Current-Sense Accuracy
o ±1.5% (max) Power-Sense Accuracy
o Two Uncommitted Comparators (MAX4211)
o 1.21V Reference Output (MAX4211)
o Three Current/Power Gain Options
o 100mV/150mV Current-Sense Full-Scale Voltage
o +4V to +28V Input Source Voltage Range
o +2.7V to +5.5V Power-Supply Voltage Range
o Low Supply Current: 380µA (MAX4210)
o 220kHz Bandwidth
o Small 6-Pin TDFN and 8-Pin µMAX Packages
(MAX4210)
Ordering Information
PART
MAX4210AETT-T
TEMP RANGE PIN-PACKAGE
-40°C to +85°C
6 TDFN-6-EP*
(3mm x 3mm)
TOP
MARK
AHF
MAX4210AEUA -40°C to +85°C 8 µMAX
*EP = Exposed paddle.
Ordering Information continued at end of data sheet.
Functional Diagrams
4V TO +
28V -
2.7V TO +
5.5V -
VCC
+ VSENSE -
RSENSE
RS+ RS-
LOAD
25:1 IOUT
POUT
1.21V
REFERENCE
REF
INHIBIT
COUT1
LE
CIN1+
CIN1-
COUT2
MAX4211A
MAX4211B
MAX4211C
GND
CIN2+
CIN2-
Functional Diagrams continued at end of data sheet.
________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.

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High-Side Power and
Current Monitors
ABSOLUTE MAXIMUM RATINGS
VCC, IN, CIN1, CIN2 to GND ....................................-0.3V to +6V
RS+, RS-, INHIBIT, LE, COUT1, COUT2 to GND ...-0.3V to +30V
IOUT, POUT, REF to GND ..........................-0.3V to (VCC + 0.3V)
Differential Input Voltage (VRS+ - VRS-) .................................±5V
Maximum Current into Any Pin..........................................±10mA
Output Short-Circuit Duration to VCC or GND ........................10s
Continuous Power Dissipation (TA = +70°C)
6-Pin TDFN (derate 24.4mW/°C above +70°C) ..........1951mW
8-Pin µMAX (derate 4.5mW/°C above +70°C) .............362mW
16-Pin TSSOP (derate 9.4mW/°C above +70°C) ..........754mW
16-Pin Thin QFN (derate 25mW/°C above +70°C) .....2000mW
Operating Temperature Range ...........................-40°C to +85°C
Junction Temperature ......................................................+150°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+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
(VCC = 5.0V, VRS+ = 25V, VSENSE = 5mV, VIN = 1.0V, VLE = 0V, RIOUT = RPOUT = 1M, VCIN1+ = VCIN2+ = VREF, VCIN1- = VCIN2- =
GND, VINHIBIT = 0V, RCOUT1 = RCOUT2 = 5kconnected to VCC, TA = -40°C to +85°C, unless otherwise noted. Typical values are at
TA = +25°C, unless otherwise noted.) (Note 1)
PARAMETER
Operating Voltage Range
(Note 2)
SYMBOL
VCC
CONDITIONS
MIN TYP MAX UNITS
2.7 5.5 V
Common-Mode Input Range
(Note 3)
Supply Current
Input Bias Current
IN Input Bias Current
Leakage Current
VSENSE Full-Scale Voltage
(Note 4)
IN Full-Scale Voltage
(Note 4)
VCMR
ICC
IRS+
IRS-
IIN
IRS+, IRS-
VSENSE_FS
VIN_FS
Measured at RS+
TA = +25°C,
VCC = +5.5V
MAX4210
MAX4211
VCC = +5.5V
MAX4210
MAX4211
VSENSE = 0mV
MAX421_A/B/C
MAX421_D/E/F
VSENSE = 0mV
MAX421_D/E/F
VCC = 0V
MAX421_A/B/D/E
MAX421_C/F
MAX421_D/E/F, VSENSE = 10mV to
100mV
4 28 V
380 570
670 960
670
µA
1100
14 25
3 8 µA
38
-0.1 -1
µA
0.1 1
µA
150
mV
100
1V
IN Input Voltage Range
(Note 5)
VIN
MAX421_D/E/F, VSENSE = 10mV to
100mV
0.16
1.10 V
VRS+ Full-Scale Voltage
(Note 4)
MAX421_A/B/C, VSENSE = 10mV to
100mV
25
V
VRS+ Input Voltage Range
(Note 5)
Minimum IOUT/POUT Voltage
Maximum IOUT/POUT Voltage
(Note 6)
VRS+
VOUT_MIN
VOUT_MAX
MAX421_A/B/C, VSENSE = 10mV to
100mV
VSENSE =
0V, VRS+ =
25V
Current into IOUT = 10µA
Current into IOUT = 100µA
Current into POUT = 10µA
Current into POUT = 100µA
VSENSE =
300mV,
VRS+ = 25V
Current out of
IOUT = 500µA
Current out of
POUT = 500µA
4
28
1.5
2.5 80
1.5
2.5 80
VCC -
0.25
VCC -
0.25
V
mV
V
2 _______________________________________________________________________________________

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High-Side Power and
Current Monitors
ELECTRICAL CHARACTERISTICS (continued)
(VCC = 5.0V, VRS+ = 25V, VSENSE = 5mV, VIN = 1.0V, VLE = 0V, RIOUT = RPOUT = 1M, VCIN1+ = VCIN2+ = VREF, VCIN1- = VCIN2- =
GND, VINHIBIT = 0V, RCOUT1 = RCOUT2 = 5kconnected to VCC, TA = -40°C to +85°C, unless otherwise noted. Typical values are at
TA = +25°C, unless otherwise noted.) (Note 1)
PARAMETER
Current-Sense Amplifier Gain
Power-Sense Amplifier Gain
IOUT Common-Mode Rejection
POUT Common-Mode Rejection
IOUT Power-Supply Rejection
POUT Power-Supply Rejection
Output Resistance for POUT,
IOUT, REF
SYMBOL
CONDITIONS
VIOUT/
VSENSE
MAX4211A/D
MAX4211B/E
MAX4211C/F
VPOUT/
(VSENSE x
VRS+)
MAX421_A
MAX421_B
MAX421_C
VPOUT/
(VSENSE x VIN)
MAX421_D
MAX421_E
MAX421_F
CMRI
CMRP
MAX4211, VRS+ = 4V to 28V
MAX421_D/E/F, VRS+ = 4V to 28V
PSRI
PSRP
VCC = 2.7V to 5.5V
VCC = 2.7V to 5.5V
ROUT
MIN TYP MAX UNITS
16.67
25.00
V/V
40.96
0.667
1.00
1.64
16.67
1/V
25.00
40.96
60 80
dB
60 80
dB
52 80
dB
52 70
dB
0.5
IOUT -3dB Bandwidth
POUT -3dB Bandwidth
BWIOUT/SENSE VSENSE = 100mV, VSENSE AC source
BWPOUT/SENSE VSENSE = 100mV, VSENSE AC source
BWPOUT/VIN
VSENSE = 100mV, VIN AC source,
MAX421_D/E/F
220 kHz
220
500
kHz
BWPOUT/RS+
VSENSE = 100mV, VRS+ AC source,
MAX421_A/B/C
250
Capacitive-Load Stability
(POUT, IOUT, REF)
CLOAD
No sustained oscillations
450 pF
Current Output (IOUT) Settling
Time to 1% of Final Value
MAX4211
MAX421_A/B/C
VSENSE = 10mV to 100mV
VSENSE = 100mV to 10mV
VSENSE = 10mV to 100mV
VSENSE = 100mV to 10mV
VRS+ = 4V to 25V,
VSENSE = 100mV
15
15
10
10
15
µs
Power Output (POUT) Settling
Time to 1% of Final Value
MAX421_D/E/F
VRS+ = 25V to 4V,
VSENSE = 100mV
VSENSE = 10mV to 100mV
VSENSE = 100mV to 10mV
VIN = 160mV to 1V,
VSENSE = 100mV
15
10
10
10
µs
VIN = 1V to 160mV,
VSENSE = 100mV
10
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High-Side Power and
Current Monitors
ELECTRICAL CHARACTERISTICS (continued)
(VCC = 5.0V, VRS+ = 25V, VSENSE = 5mV, VIN = 1.0V, VLE = 0V, RIOUT = RPOUT = 1M, VCIN1+ = VCIN2+ = VREF, VCIN1- = VCIN2- =
GND, VINHIBIT = 0V, RCOUT1 = RCOUT2 = 5kconnected to VCC, TA = -40°C to +85°C, unless otherwise noted. Typical values are at
TA = +25°C, unless otherwise noted.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
Power-Up Time to 1% of
Current Output Final Value
VSENSE = 100mV, CLOAD = 10pF,
MAX4211
100 µs
Power-Up Time to 1% of Power
Output Final Value
VSENSE = 100mV, CLOAD = 10pF
100 µs
Saturation Recovery Time for
Current Out (Note 7)
Saturation Recovery Time for
Power Out (Note 7)
Reference Voltage
Comparator Input Offset
Comparator Hysteresis
Comparator Common-Mode
Low
VREF
CLOAD = 10pF, VSENSE = -100mV to
+100mV
CLOAD = 10pF, VSENSE = 1.5V to 100mV
VCC = 5V, VRS+ = 10V, CLOAD = 10pF,
VSENSE = -100mV to +100mV
VCC = 5V, VRS+ = 10V, CLOAD = 10pF,
VSENSE = 1.5V to 100mV
IREF = 0 to 100µA, TA = +25°C
IREF = 0 to 100µA, TA = -40°C to +85°C
Common-mode voltage = REF
Functional test
1.20
1.19
35
35
25
25
1.21
±0.5
5
0.1
1.22
1.23
±5
µs
µs
V
mV
mV
V
Comparator Common-Mode
High
Comparator Input Bias Current
Comparator Output Low
Voltage
IBIAS
VOL
Functional test
ISINK = 1mA
VCC -
1.15
-2
0.2
0.6
V
nA
V
Comparator Output-High
Leakage Current (Note 8)
VPULLUP = 28V
1 µA
LE Logic Input-High Voltage
Threshold
LE Logic Input-Low Voltage
Threshold
VIH
VIL
0.67 x
VCC
0.33 x
VCC
V
V
LE Logic Input Internal
Pulldown Current
0.68 1 2.20 µA
INHIBIT Logic Input-High
Voltage Threshold
1.3 V
INHIBIT Logic Input-Low
Voltage Threshold
INHIBIT Logic Input Hysteresis
0.5
0.6
V
V
INHIBIT Logic Input Internal
Pulldown Current
0.68 1 2.20 µA
4 _______________________________________________________________________________________

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High-Side Power and
Current Monitors
ELECTRICAL CHARACTERISTICS (continued)
(VCC = 5.0V, VRS+ = 25V, VSENSE = 5mV, VIN = 1.0V, VLE = 0V, RIOUT = RPOUT = 1M, VCIN1+ = VCIN2+ = VREF, VCIN1- = VCIN2- =
GND, VINHIBIT = 0V, RCOUT1 = RCOUT2 = 5kconnected to VCC, TA = -40°C to +85°C, unless otherwise noted. Typical values are at
TA = +25°C, unless otherwise noted.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
Comparator Propagation
Delay
Minimum INHIBIT Pulse
Width
Minimum LE Pulse Width
tPD+, tPD-
CLOAD = 10pF, RLOAD = 10kpullup to
VCC, 5mV overdrive
4 µs
1 µs
1 µs
Comparator Power-Up
Blanking Time From VCC
tON
LATCH Setup Time
tSETUP
MAX4210A/MAX4211A (power gain = 0.667)
VCC from 0 to (2.7V to 5.5V)
300 µs
3 µs
POUT Gain Accuracy
(Note 9)
VPOUT/
VSENSE
VPOUT/
VRS+
VSENSE = 10mV to
100mV, VRS+ = 25V
VSENSE = 100mV,
VRS+ = 5V to 25V
TA = +25°C
TA = TMIN to TMAX
TA = +25°C
TA = TMIN to TMAX
±0.5 ±1.5
±3.0
±0.5 ±1.5
±3.0
%
Total POUT Output Error
(Note 10)
VPOUT_MAX/
FSO
VPOUT_MAX/
VPOUT
POUT Output Offset Voltage
(Note 11)
MAX4210B/MAX4211B (power gain = 1.00)
VSENSE = 5mV to
100mV, VRS+ = 5V to
25V
TA = +25°C
TA = TMIN to TMAX
VSENSE = 150mV,
VRS+ 15V
TA = +25°C
TA = TMIN to TMAX
VSENSE = 100mV, VRS+ 4V
VSENSE = 100mV, VRS+ 9V
VSENSE = 50mV, VRS+ 6V
VSENSE = 25mV, VRS+ 15V
VSENSE = 0V,
VRS+ = 25V
TA = +25°C
TA = TMIN to TMAX
±0.15
±0.2
±2.5
±1.2
±1.8
±1.8
1.5
±1.5
% FSO*
±3.0
±1.5
±3.0
%
5
mV
15
POUT Gain Accuracy
(Note 9)
VPOUT/
VSENSE
VPOUT/
VRS+
VSENSE = 10mV to
100mV, VRS+ = 25V
VSENSE = 100mV,
VRS+ = 5V to 25V
TA = +25°C
TA = TMIN to TMAX
TA = +25°C
TA = TMIN to TMAX
±0.5 ±1.5
±3.0
±0.5 ±1.5
±3.0
%
*FSO refers to full-scale output under the conditions: VSENSE = 100mV, VRS+ = +25V, or VIN = 1V.
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