General Description

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

● Server Backplanes

● Base-Station PA Control

● Telecom Equipment

● Battery Operated Devices

● Industrial Control and Automation

Benefits and Features

● 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