MAX44298 Current and Voltage Sense with Power Measurement General Description Benefits and Features The MAX44298 is a low-side current, voltage, and power High Accuracy Improves Measurement Quality monitoring circuit that provides an analog output current Accurate Power Measurement: < 1.1% of Reading proportional to the measured current, voltage, and the Total Error internally calculated instantaneous power. Zero Thermal Drift Current-Sense Input Instantaneous power is calculated internally by multiply- High Integration Saves Cost and Space ing the load current and a fraction of the load voltage Power, Current, and Voltage Monitoring Plus set by an external resistive divider. All three outputs are Reference scaled to a full-scale current of either 100A or 50A. 5mV, 10mV, and 20mV Programmable Current- This full-scale current option is set with a simple pin-strap, Sensing Full-Scale Voltage ISET. An additional output current of either 100A or 50A Calibration Point at 10A upon Command is available at the reference (REF) output this current can Single-Supply Range and Low Power Simplify be used to create a reference voltage for the ADC that is Power-Supply Design being used to measure the power, voltage, and current Current Output Signals Overcome Trace Output signals. Voltage Drops and Noise By providing the ADC with both the measured signals and 3V to 5.5V Single Supply the input reference voltage, the ADC can make a ratio- Power-Down Mode with High-Impedance Output metric measurement, allowing improved accuracy. The 0C to +85C Temperature Range use of currents, rather than voltage, to convey the mea- Tiny 16-Bump, 2.4mm x 2.4mm WLP Package sured signals to the ADC eliminates any errors caused by voltage drops across the parasitic resistance of PCB, Applications which can be significant for high-current systems. To allow Power Monitoring and Management Data Center full-system calibration, the CAL bump provides a way to and Telecom calibrate gain and offset for the ADC. Renewable Energy System Smart Battery Packs and Chargers 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- Ordering Information appears at end of data sheet. 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 0C to +85C temperature range. 19-7754 Rev 1 5/18MAX44298 Current and Voltage Sense with Power Measurement Absolute Maximum Ratings VDD1 to GND1 .......................................................-0.3V to +6V CAL, G1, G0, ISET, CF Continuous Current ....................10mA VDD2 to GND2 .......................................................-0.3V to +6V VOUT, IOUT, POUT, REF Continuous Current ................10mA VDD1 to VDD2 ....................................................-0.3V to +0.3V Continuous Power Dissipation (T = +70C) A GND1 to GND2 ...................................................-0.3V to +0.3V WLP (derate 20.4mW/C above +70C) ....................1632mW RS+, RS- to GND2 .................................................-0.3V to +2V Operating Temperature Range ...............................0C to +85C RS+ to RS- ...........................................................................2V Junction Temperature ......................................................+150C V , CAL, G1, G0, ISET, IOUT, VOUT, REF, Storage Temperature Range .............................-65C to +150C IN POUT to GND1 ..................................- 0.3V to (+V + 0.3V) Lead Temperature (soldering, 10s) .................................+300C DD Output Short-Circuit Duration ....................................Continuous Soldering Temperature (reflow) .......................................+260C Package Thermal Characteristics (Note 1) WLP Junction-to-Ambient Thermal Resistance ( ) ..........49C/W JA 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 (V = V = V = 3.3V, V = 0V, V = V /2, R = 1m, V = 0.54V, R = 30.1k to GND, C = 100pF, T = 0C DD DD1 DD2 ISET SENSE FS SENSE IN L L A to +85C, unless otherwise noted. Typical values are at T = +25C.) (Note 2) A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS CURRENT SENSE (RS+, RS-) Input Common-Mode Voltage (V + V )/2 -0.1 +0.1 V RS+ RS- Range G1 = 1, G0 = 1 20 V - RS+ V Input Full-Scale Range FSR I G1 = 1, G0 = 0 10 mV SENSE V RS- G1 = 0, G0 = 1 5 All three V ranges, ISET = 0 100 SENSE I Output Full-Scale Range FSR O A OUT All three V ranges, ISET = 1 50 SENSE Compliance Output Voltage V - V (1% accuracy) 300 mV DD IOUT I Output Referred Noise 5mV range, Noise BW = 10kHz 600 V OUT RMS 1.1 Total Error (100A Range) Between 30% and 90% of FSR 3.5 % RDG Total Error (50A Range) Between 30% and 90% of FSR 1.3 4 % RDG 50 Settling Time to 1% (Note 3) V steps from 25% to 75% s SENSE Maxim Integrated 2 www.maximintegrated.com