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PDF MAX44298 Data sheet ( Hoja de datos )
| Número de pieza | MAX44298 | |
| Descripción | Current and Voltage Sense | |
| Fabricantes | Maxim Integrated | |
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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
1 page  
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
POUT TUE
(Current Input = 15% of FSR)
POUT TUE
(Current Input = 5% of FSR)
POUT TUE
(Current Input = 1% of FSR)
PSRR
Output-Referred Noise
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
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
3V < VDD < 5.5V
5mV VSENSE range,
Noise BW = 10kHz
3.8 5.8
9
3.8 5.8
% RDG
9
3.8 5.8
9
4.9 9.5
13.5
4.9 9.5
% RDG
13.5
4.9 9.5
13.5
10.1 23
25
10.1 23
% RDG
25
10.1 23
25
15 nA/V
400 µVRMS
www.maximintegrated.com
Maxim Integrated │ 5
5 Page 
MAX44298
Current and Voltage Sense with
Power Measurement
Pin Description (continued)
BUMP
C1
C2
C3
NAME
VDD2
VDD1
G0
FUNCTION
Power Supply for Current-Sense Amplifier
Main Power-Supply Voltage Input. Bypass VDD with a 0.1µF capacitor to GND.
CSA VSENSE FS Range Select Input. G0, together with G1, selects the CSA VSENSE FS Range
(see Table 1). When both G1 and G0 are low, the device is powered down. G0 has an internal
weak pullup.
C4
POUT
Current-Source Output. POUT represents the measured power, scaled by the different current-
sense ranges, the external current-sense resistor and the voltage-divider.
D1
VIN
Load Voltage Input. This voltage input is connected with external scaling resistors to set full scale
to be 1.00V
D2
REF
Reference Current Source Output. REF outputs 100µA/50µA FS output current range and is
intended to be used with a resistor to provide the reference voltage for an external ADC.
D3
VOUT
VOUT Current Source Output. VOUT FS output current represents 1.00V on the VIN bump.
D4
GND1
Ground. Main power supply and digital signal return.
Detailed Description
The MAX44298 low-side current, voltage, and power
monitoring circuit provides scaled analog output currents
proportional to the measured current, voltage, and the
instantaneous power. The device provides instantaneous
power monitoring by internally multiplying the scaled load
current and a scaled fraction of the load voltage. All three
measured current/voltage/power outputs (IOUT, VOUT,
POUT) are scaled to a full-scale current of either 100µA
or 50µA. An additional full-scale output current of either
100µA or 50µA is available at the reference (REF) output.
Use the REF output to create a reference voltage for
the ADC that is being used to measure the power, volt-
age, and current signals. To set full-scale output current
for all four outputs, connect ISET to ground or leave it
unconnected to select the 100µA full-scale output current.
Connect ISET to VDD to select the 50µA full-scale current.
The MAX44298 measures the load current by using a
precision, auto-zeroed, 5µV - VOS CSA allowing accu-
rate full-scale VSENSE ranges of 5mV, 10mV, and 20mV
and provides scaled output at IOUT. The load voltage is
measured via a user-selectable resistive divider (dividing the
load input voltage down to a full-scale VIN of 1.00V) and an
integrated high input impedance buffer that provide scaled
output at VOUT. The device monitors the instantaneous
input power by internally multiplying the scaled load current
and a scaled fraction of the load voltage and provides scaled
output at POUT.
Calibration
The reference output (REF) always outputs full-scale current
and the other three outputs (IOUT, VOUT, POUT) track this
full-scale value. The device provides a logic-input signal (CAL)
to allow full-system calibration. When CAL is at a logic low,
100% of FS output current (100µA/50µA depending on the
ISET input state) is available at all four IOUT, VOUT, POUT
and REF outputs. When CAL is pulled high, the device forces
three IOUT, VOUT, and POUT outputs to source a typically
fixed 10µA (regardless of the state of the state of the ISET
input). This, together with the REF always outputs 100% FS,
allows two-point (gain and offset) calculated. Zero is not used
since the device cannot output a negative current but could
have a negative offset. This calibration is more for the ADC
and scaling resistors, the MAX44298 is internally trimmed
over temperature.
www.maximintegrated.com
Maxim Integrated │ 11
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet MAX44298.PDF ] | |
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