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LTC2970/LTC2970-1 - Dual I2C Power Supply Monitor and Margining Controller

The LTC®2970 is a dual power supply monitor and margining controller with an SMBus compatible I2C bus interface. A low-drift, on-chip reference and 14-bit ΔΣ A/D converter allow precise measurements of supply voltages, load currents or internal die temperature. Fault management allows ALERT to be asserted for configurable overvoltage and undervoltage fault conditions. Two voltage buffered, 8-bit IDACs allow highly accurate programming of DC/DC converter output voltages. The IDACs can be configured to automatically servo the power supplies to the desired voltages using the ADC. The LTC2970-1 adds a tracking feature that can be used to turn multiple power supplies on or off in a controlled manner.

The bus address is set to 1 of 9 possible combinations by pin strapping the ASEL0 and ASEL1 pins. The LTC2970/ LTC2970-1 are packaged in the 24-lead, 4mm × 5mm QFN package.

Features Less Than ±0.5% Total Unadjusted Error 14-Bit DS ADC with On-Chip Reference Dual, 8-Bit IDACs with 1x Voltage Buffers Linear, Voltage Servo Adjusts Supply Voltages by Ramping IDAC Outputs Up/Down I2C Bus Interface (SMBus Compatible) Extensive, User Configurable Fault Monitoring On-Chip Temperature Sensor Available in 24-Lead 4mm × 5mm QFN Package Typical Application

Applications Dual Power Supply Voltage Servo Monitoring Supply Voltage and Current Programmable Power Supplies Programmable Reference Packaging

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