Active production, wide supply range for high-side sensing
The MAX4080SAUA+T is an active-production current sense amplifier from Analog Devices, confirmed as current lifecycle stage and ROHS3 compliant.
250 kHz bandwidth, 75 µA supply — measurement speed vs power budget
The -3 dB bandwidth of 250 kHz sets the upper frequency for accurate current measurement — above this, the output amplitude rolls off. For a switching power supply running at 200 kHz, the amplifier can track the average current but will attenuate ripple components above the corner frequency. Supply current is 75 µA typical, which keeps the thermal contribution negligible in the 8-uMAX package and allows the part to remain powered in always-on monitoring nodes without draining the bias rail.
100 µV offset, 5 µA bias — the accuracy floor for shunt selection
For a 10 mΩ shunt carrying 1 A, the sense voltage is 10 mV — the offset contributes a 1% error before any temperature drift. The bias current flows through the shunt and adds a small voltage drop; with a 10 mΩ shunt this is 50 µV, or 0.5% of the sense signal. These two parameters set the practical lower bound on shunt resistance for a given accuracy target.
The offset and bias current drift over this range are not specified in the brief listing, so a bench verification at the temperature extremes is advisable for designs that push the accuracy budget at high temperature.
8-uMAX surface-mount package, tape and reel
Supplied in an 8-TSSOP or 8-MSOP package (0.118-inch, 3.00 mm width) with the supplier device package designated as 8-uMAX/uSOP. Mounting type is surface mount, available in tape and reel or cut tape options.