Precision, Fast Sample-Rate, Digital Current-Sense Amplifier

The MAX40080 is a high-precision, fast-response, bi-directional current-sense amplifier with digital output and a very wide input common-mode range from -0.1V (ground sensing) to 36V.

The device features an ultra-low 5μV input offset voltage and a very low 0.2% gain error. The low input offset voltage is especially important because it allows using a small sense resistor, thus saving power dissipation, but at the same time not compromising the measurement accuracy. The device also features a programmable input sensing range between ±10mV and ±50mV (or programmable input gain between 125V/V and 25V/V) which is very useful to enhance accuracy at low current.

The device includes an analog-to-digital converter with a programmable sample rate and 12-bit resolution (13-bit including sign bit for current measurement) and features an I2C compliant and SMBus compatible interface.

The device features a wake-up current threshold and auto-shutdown mode when the I2C is inactive. Both these features are designed to minimize power consumption.

The device is available in a small 12-pin WLP (and also a 12-pin TDFN) and is specified over the -40°C to +125°C extended operating temperature range.

Applications

* Base-Station PA Control * Battery Operated Devices * Industrial Control and Automation * Server Backplanes * Telecom Equipment

* Programmable Sample Rate up to 1Msps

* Wide Input Common-Mode range from -0.1V (ground sensing) to 36V

* Programmable Input Sense Range (±10mV and ±50mV)

* Very low 5μV Input Offset Voltage allows using a small sense resistor

* I2C compliant and SMBus compatible interface with smart modes to save power:

* Wake-up current threshold

* Low 4 measurements/s rate

* Auto-shutdown when I2C is inactive

* Bi-directional current sensing

* Common-Mode Voltage monitoring up to 36V

* Space-saving 12-bump WLP (0.4mm pitch) and 12-pin TDFN

* Peak current Log

* Programmable over-current/voltage thresholds and under-voltage threshold

* Alert output with programmable response time

* 64-cell deep FIFO