The LTC4151 is a high-side power monitor that measures current and input voltages from 7 to 80V. It utilises an internal 12-bit ADC to continuously measure both high-side current and input voltage to yield an accurate power reading. The monitor's simple, single-chip solution is suited for 48V telecom equipment, AMCs (advanced mezzanine cards), and blade servers used for measuring input power over a wide input range. The device is also appropriate for power monitoring in industrial applications running at 12 or 24V. The maximum TUE (total unadjusted error) for the high-side-current and voltage measurements is ±1.25% over the -40 to +85°C industrial temperature range. A two-wire I²C-compatible interface reports the input-power data, as well as a third low-voltage input, which can be used to measure a voltage from a thermistor or a fuse. Data can be reported continuously or in a no-latency single snapshot mode, for applications that only need to measure input power occasionally. The device features a dedicated shutdown pin to reduce power dissipation by a factor of 10, while its counterpart, the LTC4151-1, features split I²C data pins with an inverted output to drive optoisolators.
