Quad Power System Manager Unrivaled ±0.25% Measurement Accuracy Increases System Efficiency The LTC®2974 PMBus power system manager with EEPROM provides complete digital power management of power supply systems with four or more rails. The LTC2974 utilizes an I2C interface and PMBus command set to monitor, supervise, sequence, margin, fault manage and fault log positive or negative supplies. This provides rapid troubleshooting and debug capabilities during power system design, development, production and failure analysis. Power supply channels can be sequenced on or off using event or programmable time delays, while dedicated voltage and current supervisors on each channel provide precise thresholds and fast response times to protect loads from electrical overstress. All of the LTC2974’s functions perform with uncompromised accuracy, including better than ±0.25% of total unadjusted error on ADC telemetry, and 0.25% margining and trimming accuracy on each supply. Users can harness the powerful LTpowerPlay™ GUI to configure and interrogate the LTC2974’s registers, user settings and fault log. Once configured, the LTC2974 provides the essential system management functions without host intervention and does not require writing a single line of code. Features n n n n n n n n n n Margin/Trim Four Supplies to ±0.25% Accuracy EEPROM for Configuration, Black Box Fault Logging I2C/SMBus Interface, PMBus Compliant Supported by LTpowerPlay GUI Operates Autonomously Without Additional Software Four-Supply Sequencer, Time Based or Tracking Monitor and Supervise: −− Input and Four Output Voltages −− Four Currents −− Four Temperature Sensors −− Die Temperature (Monitor Only) Watchdog Timer Powered from 3.3V, or 4.5V to 15V 64-Pin 9mm × 9mm QFN Package 4.5V < VIBUS < 15V VIN I– LTC2974* 0V I+ VIN_SNS VPWR ISENSEP0 AUXFAULTB TG VSENSEM0 VDD33** SW VDAC0 SDA PMBus Interface DC/DC CONVERTER VSENSEP0 BG SCL LOAD ALERTB VFB CONTROL0 To/From Other LTC2974s FAULT0 ISENSEM0 SGND FAULT1 V0UT_EN0 RUN/SS SHARE_CLK TSENSE0 ASEL0 ASEL1 WP PWRGD WDI/RESETB GND L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and LTpowerPlay is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. GND To µP RESETB Input Watchdog Timer Interrupt * Some details have been omitted for clarity. Only one of four channels is shown. ** LTC2974 can also be powered directly from the external 3.3V supply. Complete Development Platform with LTpowerPlay GUI USB DC1613 USB to PMBus Controller DC2031 Socketed Programming Board DC1978 LTC2974 Demo Board Demonstration Kit or Socketed Programming Customer Board with LTC2974 or In-Circuit Serial Programming www.linear.com/LTC2974 n 1-800-4-LINEAR 0313f