MAX44298 Current and Voltage Sense with Power Measurement
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Catalog excerpts

MAX44298 Current and Voltage Sense with Power Measurement - 1

Current and Voltage Sense with Power Measurement General Description Instantaneous power is calculated internally by multiplying 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. ●● High Integration Saves Cost and Space • Power, Current, and Voltage Monitoring Plus Reference • 5mV, 10mV, and 20mV Programmable CurrentSensing Full-Scale Voltage • Calibration Point at 10µA upon Command 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. By providing the ADC with both the measured signals and the input reference voltage, the ADC can make a ratiometric measurement, allowing improved accuracy. The use of currents, rather than voltage, to convey the measured 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 precision, auto-zeroed current-sense amplifier (CSA), which due to its ultra-low offset voltage allows precise measurement 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 microcontroller. The MAX44298 can be powered down and the outputs will then go high impedance. The device is available in a 2.4mm x 2.4mm, 16-bump WLP package and is specified for the 0°C to +85°C temperature range. ●● High Accuracy Improves Measurement Quality • Accurate Power Measurement: < 1.1% of Reading Total Error • Zero Thermal Drift Current-Sense Input ●● 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 ●● Power Monitoring and Management Data Center and Telecom ●● Renewable Energy System ●● Smart Battery Packs and Chargers

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MAX44298 Current and Voltage Sense with Power Measurement - 2

Current and Voltage Sense with Power Measurement 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 All three VSENSE ranges, ISET = 0 All three VSENSE ranges, ISET = 1 Compliance Output Voltage IOUT Output Referred Noise Total Error (100µA Range) Total Error (50µA Range) Settling Time to 1%...

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MAX44298 Current and Voltage Sense with Power Measurement - 3

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 LOAD VOLTAGE SENSE (VIN) Input Voltage Range VOUT Output Full-Scale Current Range Compliance Output Voltage VOUT Output-Referred Noise Total Error (100µA Range) Total Error (50µA Range) POWER SENSE (POUT), OUTPUT FS = 100µA (Note 3) Output Full-Scale Current All three VSENSE ranges, ISET = 0...

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MAX44298 Current and Voltage Sense with Power Measurement - 4

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 20mV VSENSE range, 0°C < TA < +85°C POUT TUE (Current Input = 5% of FSR) 20mV VSENSE range, 0°C < TA < +85°C POUT TUE (Current Input = 1% of FSR) POWER SENSE (POUT), OUTPUT FS = 50µA (Note 3) Output Full-Scale Current All three VSENSE ranges, ISET = 1 Compliance Output Voltage VDD – VPOUT (1%...

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MAX44298 Current and Voltage Sense with Power Measurement - 5

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 CONDITIONS 20mV VSENSE range, +25°C < TA < +85°C 20mV VSENSE range, 0°C < TA < +85°C POUT TUE (Current Input = 15% of FSR) 5mV VSENSE range, 0°C < TA < +85°C 20mV VSENSE range, +25°C < TA < +85°C 10mV VSENSE range, 0°C < TA < +85°C 5mV VSENSE range, +25°C < TA < +85°C 20mV VSENSE range, 0°C < TA <...

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MAX44298 Current and Voltage Sense with Power Measurement - 6

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 Output Settling Time to 1% (VIN steps from 60% to 80% or VSENSE steps from 60% to 80%) REFERENCE OUTPUT (REF) REF Output Full-Scale Current Range Compliance Output Voltage Reference Output Current Temperature Coefficient Output-Referred Noise CALIBRATION CURRENT (CAL = 1) Nominal Current Current...

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