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Power monitor measures current, voltage up to 8V

Posted: 10 Mar 2008 ?? ?Print Version ?Bookmark and Share

Keywords:power monitor? ADC? controller?

Linear Technology Corp. has introduced the LTC4151, a high-side power monitor that measures current and input voltages from 7V to 80V. The device uses an internal 12bit ADC to continuously measure both high-side current and input voltage to give a true power reading. It replaces prior solutions that use costly current sense amplifiers with a separate ADC, a hot-swap controller with an ADC, or an ADC with a floating ground. These older implementations are in many cases limited by the ADC's input voltage range (typically 5V or 10V), are much more expensive, require more board space and are not reliable. The LTC4151's simple, single-chip solution is suitable for 48V telecom equipment, advanced mezzanine cards (AMC) 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 12V or 24V.

The maximum total unadjusted error (TUE) for the high-side current and voltage measurements is 1.25 percent over the -40C to 85C industrial temperature range. A 2-wire I?C-compatible interface reports the LTC4151's 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 LTC4151 features a dedicated shutdown pin to reduce power dissipation by 10x, while its counterpart, the LTC4151-1, features split I?C data pins with an inverted output to drive optoisolators.

The LTC4151 and LTC4151-1 are both available in tiny MSOP-10 and 3mm x 3mm DFN-10 packages, with pricing beginning at $2.60 in 1,000-piece quantities.

Linear Technology is one of the exhibitors in the IIC-China 2008.

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