DESCRIPTION
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 ⎯A⎯L⎯E⎯R⎯T to be asserted for confi gurable over and under voltage fault conditions. Two voltage buffered, 8-bit IDACs allow highly accurate programming of DC/DC converter output voltages. The IDACs can be confi gured 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.

FEATURES
■ Less Than ±0.5% Total Unadjusted Error 14-Bit ΔΣ 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 Confi gurable Fault Monitoring
■ On-Chip Temperature Sensor
■ Available in 24-Lead 4mm × 5mm QFN Package

APPLICATIONS
■ Dual Power Supply Voltage Servo
■ Monitoring Supply Voltage and Current
■ Programmable Power Supplies
■ Programmable Reference