Measures up High voltage I2C current and voltage monitor


The LTC4151 is a high side power monitor that operates over a wide voltage range of 7V to 80V. In default operation mode, the onboard 12-bit ADC continuously measures high side current, input voltage and an external voltage. Data is reported through the I2C interface when polled by a host. The LTC4151 can also perform on-demand measurement in a snapshot mode. The LTC4151 features a dedicated shutdown pin to reduce power consumption. The LTC4151-1/LTC4151-2 feature split I2C data pins to drive opto-isolators. The data out on the LTC4151-1 is inverted while that on the LTC4151-2 is not.


  • Wide Operating Voltage Range: 7V to 80V
  • 12-Bit Resolution for Both Current and Voltages
  • I2C Interface
  • Additional ADC Input Monitors an External Voltage Continuous Scan and Snapshot Modes
  • Shutdown Mode (LTC4151) Reduces Quiescent Current to 120μA
  • Split SDA for Opto-isolation (LTC4151-1/LTC4151-2)
  • Available in 10-Lead MSOP, 10-Lead 3mm × 3mm DFN and 16-Lead SO Packages


  • Telecom Infrastructure
  • Automotive
  • Industrial
  • Consumer

Because of the wide operating range, the LTC4151 is useful in systems ranging from telecom to automotive.  By integrating all of the necessary functional blocks in a single-chip solution, power monitoring is made practical in applications where a discrete solution is out of the question due to space or cost.

Simple, Sophisticated
The LTC4151 finds its way into many complex, space-constrained, low voltage applications including RAID systems, telecoms and industrial control systems.  Fortunately, only a few simple connections need to be made to this device, available in a small MS10 or tiny 3mm x 3mm DFN package.  Depending on the system, the monitoring IC could be located on the backplane or on a removable card; Figure 2 is an example of the latter, which shows the LTC4151 monitoring the input current and voltage to a 12V DC/DC converter.  Here, the low voltage input, ADIN, is used to measure the 5V output of the converter, while a direct I2C connection is made to the microprocessor.  The only required external components are a sense resistor, two bus pull-up resistors and a resistive divider for 5V measurement on ADIN.

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