MAX44298 Datasheet PDF - Maxim Integrated

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MAX44298
Maxim Integrated

Part Number MAX44298
Description Current and Voltage Sense
Page 16 Pages


MAX44298 datasheet pdf
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MAX44298
Current and Voltage Sense with
Power Measurement
General Description
The MAX44298 is a low-side current, voltage, and power
monitoring circuit that provides an analog output current
proportional to the measured current, voltage, and the
internally calculated instantaneous power.
Instantaneous power is calculated internally by multiply-
ing the load current and a fraction of the load voltage
set by an external resistive divider. All three outputs are
scaled to a full-scale current of either 100µA or 50µA.
This full-scale current option is set with a simple pin-strap,
ISET. An additional output current of either 100µA or 50µA
is available at the reference (REF) output; this current can
be used to create a reference voltage for the ADC that is
being used to measure the power, voltage, and current
signals.
By providing the ADC with both the measured signals and
the input reference voltage, the ADC can make a ratio-
metric measurement, allowing improved accuracy. The
use of currents, rather than voltage, to convey the mea-
sured signals to the ADC eliminates any errors caused
by voltage drops across the parasitic resistance of PCB,
which can be significant for high-current systems. To allow
full-system calibration, the CAL bump provides a way to
calibrate gain and offset for the ADC.
The MAX44298 measures load current by using a preci-
sion, auto-zeroed current-sense amplifier (CSA), which
due to its ultra-low offset voltage allows precise measure-
ment of full-scale voltages of 5mV, 10mV, and 20mV. The
load voltage is measured via a user-selectable resistive
network, dividing the input voltage down to a full scale of
1.00V.
The wide supply voltage range of 3V to 5.5V allows the
simple sharing of supplies with either the ADC or a micro-
controller. The MAX44298 can be powered down and the
outputs will then go high impedance. The device is avail-
able in a 2.4mm x 2.4mm, 16-bump WLP package and is
specified for the 0°C to +85°C temperature range.
Benefits and Features
● High Accuracy Improves Measurement Quality
• Accurate Power Measurement: < 1.1% of Reading
Total Error
• Zero Thermal Drift Current-Sense Input
● High Integration Saves Cost and Space
• Power, Current, and Voltage Monitoring Plus
Reference
• 5mV, 10mV, and 20mV Programmable Current-
Sensing Full-Scale Voltage
• Calibration Point at 10µA upon Command
● Single-Supply Range and Low Power Simplify
Power-Supply Design
• Current Output Signals Overcome Trace Output
Voltage Drops and Noise
• 3V to 5.5V Single Supply
• Power-Down Mode with High-Impedance Output
• 0°C to +85°C Temperature Range
• Tiny 16-Bump, 2.4mm x 2.4mm WLP Package
Applications
● Power Monitoring and Management Data Center
and Telecom
● Renewable Energy System
● Smart Battery Packs and Chargers
Ordering Information appears at end of data sheet.
19-7754; Rev 0; 10/15



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MAX44298
Current and Voltage Sense with
Power Measurement
Absolute Maximum Ratings
VDD1 to GND1 ........................................................-0.3V to +6V
VDD2 to GND2 ........................................................-0.3V to +6V
VDD1 to VDD2 .....................................................-0.3V to +0.3V
GND1 to GND2 ....................................................-0.3V to +0.3V
RS+, RS- to GND2 ..................................................-0.3V to +2V
RS+ to RS- ............................................................................±2V
VIN, CAL, G1, G0, ISET, IOUT, VOUT, REF,
POUT to GND1................................... - 0.3V to (+VDD + 0.3V)
Output Short-Circuit Duration.....................................Continuous
CAL, G1, G0, ISET, CF Continuous Current.....................±10mA
VOUT, IOUT, POUT, REF Continuous Current.................±10mA
Continuous Power Dissipation (TA = +70°C)
WLP (derate 20.4mW/°C above +70°C).....................1632mW
Operating Temperature Range................................0ºC to +85°C
Junction Temperature.......................................................+150°C
Storage Temperature Range..............................-65ºC to +150°C
Lead Temperature (soldering, 10s).................................. +300°C
Soldering Temperature (reflow)........................................+260°C
Package Thermal Characteristics (Note 1)
WLP
Junction-to-Ambient Thermal Resistance (θJA)...........49°C/W
Note 1: Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a four-layer
board. For detailed information on package thermal considerations, refer to www.maximintegrated.com/thermal-tutorial.
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
(VDD = VDD1 = VDD2 = 3.3V, VISET = 0V, VSENSE = VFS/2, RSENSE = 1mΩ, VIN = 0.54V, RL = 30.1kΩ to GND, CL = 100pF, TA = 0°C
to +85°C, unless otherwise noted. Typical values are at TA = +25°C.) (Note 2)
PARAMETER
CURRENT SENSE (RS+, RS-)
Input Common-Mode Voltage
Range
VSENSE Input Full-Scale Range
IOUT Output Full-Scale Range
Compliance Output Voltage
IOUT Output Referred Noise
Total Error (100µA Range)
Total Error (50µA Range)
Settling Time to 1% (Note 3)
SYMBOL
CONDITIONS
FSR_I
FSR_O
(VRS+ + VRS-)/2
VRS+ -
VRS-
G1 = 1, G0 = 1
G1 = 1, G0 = 0
G1 = 0, G0 = 1
All three VSENSE ranges, ISET = 0
All three VSENSE ranges, ISET = 1
VDD - VIOUT (1% accuracy)
5mV range, Noise BW = 10kHz
Between 30% and 90% of FSR
Between 30% and 90% of FSR
VSENSE steps from 25% to 75%
MIN
-0.1
300
TYP
MAX
UNITS
+0.1
V
20
10 mV
5
100
µA
50
mV
600 µVRMS
1.1 3.5 % RDG
1.3 4 % RDG
50 µs
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MAX44298
Current and Voltage Sense with
Power Measurement
Electrical Characteristics (continued)
(VDD = VDD1 = VDD2 = 3.3V, VISET = 0V, VSENSE = VFS/2, RSENSE = 1mΩ, VIN = 0.54V, RL = 30.1kΩ to GND, CL = 100pF, TA = 0°C
to +85°C, unless otherwise noted. Typical values are at TA = +25°C.) (Note 2)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
LOAD VOLTAGE SENSE (VIN)
Input Voltage Range
VOUT Output Full-Scale Current
Range
VIN
ISET = 0
ISET = 1
0.45
0.75 1.005
100
50
V
µA
Compliance Output Voltage
VOUT Output-Referred Noise
Total Error (100µA Range)
Total Error (50µA Range)
VDD - VVOUT (0.1% accuracy)
300
mV
Noise BW = 10kHz
40 µVRMS
Voltage between 50% and 90% of
FSR
0.5 2.5 % RDG
Voltage between 50% and 90% of
FSR
0.5 3 % RDG
Settling Time to 1%
VIN steps from 0.6V to 0.8V
POWER SENSE (POUT), OUTPUT FS = 100µA (Note 3)
20 µs
Output Full-Scale Current
Compliance Output Voltage
POUT TUE
(Current Input between 30% and
95% of FSR)
POUT TUE
(Current Input = 15% of FSR)
All three VSENSE ranges, ISET = 0
100
µA
VDD - VPOUT (1% accuracy)
300
mV
20mV VSENSE range,
+25°C < TA < +85°C
1.1 3.9
20mV VSENSE range,
0°C < TA < +85°C
4.5
10mV VSENSE range,
+25°C < TA < +85°C
10mV VSENSE range,
0°C < TA < +85°C
1.1 4
% RDG
4.5
5mV VSENSE range,
+25°C < TA < +85°C
1.1 4.5
5mV VSENSE range,
0°C < TA < +85°C
4.5
20mV VSENSE range,
+25°C < TA < +85°C
2.2 4.5
20mV VSENSE range,
0°C < TA < +85°C
7
10mV VSENSE range,
+25°C < TA < +85°C
10mV VSENSE range,
0°C < TA < +85°C
2.2 4.5
% RDG
7
5mV VSENSE range,
+25°C < TA < +85°C
2.2 4.5
5mV VSENSE range,
0°C < TA < +85°C
7
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MAX44298
Current and Voltage Sense with
Power Measurement
Electrical Characteristics (continued)
(VDD = VDD1 = VDD2 = 3.3V, VISET = 0V, VSENSE = VFS/2, RSENSE = 1mΩ, VIN = 0.54V, RL = 30.1kΩ to GND, CL = 100pF, TA = 0°C
to +85°C, unless otherwise noted. Typical values are at TA = +25°C.) (Note 2)
PARAMETER
SYMBOL
CONDITIONS
POUT TUE
(Current Input = 5% of FSR)
POUT TUE
(Current Input = 1% of FSR)
20mV VSENSE range,
+25°C < TA < +85°C
20mV VSENSE range,
0°C < TA < +85°C
10mV VSENSE range,
+25°C < TA < +85°C
10mV VSENSE range,
0°C < TA < +85°C
5mV VSENSE range,
+25°C < TA < +85°C
5mV VSENSE range,
0°C < TA < +85°C
20mV VSENSE range,
+25°C < TA < +85°C
20mV VSENSE range,
0°C < TA < +85°C
10mV VSENSE range,
+25°C < TA < +85°C
10mV VSENSE range,
0°C < TA < +85°C
5mV VSENSE range,
+25°C < TA < +85°C
5mV VSENSE range,
0°C < TA < +85°C
POWER SENSE (POUT), OUTPUT FS = 50µA (Note 3)
MIN
TYP
MAX
UNITS
3.5 8.5
12
3.5 8.5
% RDG
12
3.5 8.5
12
6.1 20
22
6.1 20
% RDG
22
6.1 20
22
Output Full-Scale Current
Compliance Output Voltage
POUT TUE
(Current Input between 30% and
95% of FSR)
All three VSENSE ranges, ISET = 1
50
µA
VDD – VPOUT (1% accuracy)
300
mV
20mV VSENSE range,
+25°C < TA < +85°C
1.5 4.5
20mV VSENSE range,
0°C < TA < +85°C
6.5
10mV VSENSE range,
+25°C < TA < +85°C
10mV VSENSE range,
0°C < TA < +85°C
1.5 4.5
% RDG
6.5
5mV VSENSE range,
+25°C < TA < +85°C
1.5 4.5
5mV VSENSE range,
0°C < TA < +85°C
6.5
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