PMBus Power System Managers VIN LTC2975 Buck* EEPROM Boost* LDO* LDO* STATUS LTC2974 2-Phase DC/DC* EEPROM 4-Phase DC/DC* DC/DC* DC/DC* STATUS DC/DC* LTC2977 DC/DC* DC/DC* EEPROM rPlay LTpowe DC/DC* DC/DC* For Prototyping and Debug FREE Download www.linear.com/LTpowerPlay DC/DC* DC/DC* DC/DC* STATUS *Any power supply. Specific types shown as example USB DC1613 PMBus Controller Features Power Supply Channels Managed PMBus To other PMBus Power System Managers and DC/DC Converters LTC®2977* LTC2974 LTC2975 8 4 4 Sequence, Trim, Margin and Supervise ü ü ü Monitor Telemetry ü ü ü Manage Faults and Create Fault Logs ü ü ü ü LTpowerPlay™ GUI Support ü ü Differential Output Voltage Sense Channels 8 4 4 Output Current Sense Channels 4† 4 4 External Temperature Channels – 4 4 Input Voltage Sense ü ü ü Input Current, Power and Energy Time Based Sequencing ü ü Cascade Sequencing Interfaces to Tracking DC/DC Converters Trim and Margin Accuracy ü ü ü ü ü ü ü 0.25% 0.25% 0.25% Fault Logging to Internal EEPROM ü ü ü Autonomous Operation — “Set and Forget” ü ü ü PMBus Compliant Command Set ü ü ü † Not temperature compensated. Available on odd channels only. All other channel features are disabled. * Note the LTC2977 is a 100% pin-compatible upgrade to the LTC2978/LTC2978A and is recommended for new designs. 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. Complete Power System Management Family DC/DC Converters with Power System Management Power System Managers Power Supply Channels LTC2977 LTC2978(A) LTC2974 LTC2975 LTC3880 LTC3883 2 8 8 4 4 2 1 2 ü ü ü ü ü ü ü Overview Sequence Trim and Margin ü ü ü ü ü ü ü ü Supervise ü ü ü ü ü ü ü ü Monitor Telemetry ü ü ü ü ü ü ü ü Manage Faults ü ü ü ü ü ü ü ü ü ü ü ü ü ü ü ü ü ü ü Create Fault Logs Point-of-Load Buck Controller Power LTpowerPlay GUI Support Sequencing ü ü ü ü ü ü Output Channels – – – – – 2 1 2 Output Voltage Range – – – – – 0.5V to 5.4V 0.5V to 5.4V 0.5V to 5.4V PWM Control Mode – – – – – Current Current Current 15V 15V 15V 15V 15V 24V 24V 26.5V Time Based Sequencing ü ü ü ü ü ü ü Shared Timebase (SHARE_CLK) ü ü ü ü ü ü ü ü ü ü ü 0.25% 0.25% Integrated Power Stage Maximum Input Voltage ü Cascade Sequencing Interfaces to Tracking DC/DC Converters ü Servo Programmable Output Ramp Rate Trim Accuracy* Supervision 0.25% 0.25% ü ü ü 0.5% 0.5% 1% ü ü ü ü ü ü ü ü Margin Accuracy* 0.5% 0.25% 0.25% 0.25% 0.25% 0.5% 0.5% 1% Worst Case Voltage Supervisor Accuracy* ü ü ü ü ü ü ü ü 0.5% 1.5% 1.5% 1.5% 1.5% 2.0% 2.0% 2.0% Typical Analog OV Response Time* – – – – – 100ns 100ns 100ns Typical OV Fault Off-Time* – 12µs 12µs 12µs 12µs 30µs 30µs 30µs Input Voltage Comparator ü ü ü ü ü ü ü ü Output Current Supervision ü ü ü ü ü ü 1 Internal 4 External 4 External 1 Int + 2 Ext 1 Int + 1 2 Int + 1 Ext 2 Temperature Supervision Monitoring 0.5% Margin High/Low Output Voltage Supervision 1 Internal 1 Internal Differential Output Voltage Sense Channels 2 8 8 4 4 2 1 Output Current Sense Channels 2 4† 4† 4 4 2 1 2 External Temperature Channels – – – 4 4 2 1 1 Opt Input Voltage Sense ü ü ü ü ü ü ü ü Input Current Sense – – – – Direct Inferred Direct Inferred ü ü ü ü Factory Trimmed Input Power and Energy ü Output Power ü ü Current Sense Calibration Faults Duty Cycle ü ü ü Fault Logging to Internal EEPROM ü ü ü ü ü ü ü Fault Sharing ü ü ü ü ü ü ü Autonomous Retry on Fault ü ü ü ü ü ü ü ü ü ü ü ü ü ü ü ü ü ü ü Disable DC/DC Converter on Fault ü Disable Intermediate Bus Converter on Fault Autonomous Operation — “Set and Forget” Miscellaneous LTM®4676 LTC2970 ü ü ü ü ü ü ü ü ü ü ü ü ü ü 400kHz 400kHz 400kHz 400kHz 400kHz 100kHz 100kHz 100kHz PMBus Compliant Command Set ü ü ü ü ü ü ü Command Plus Command Set ü 6mm × 6mm QFN 5mm × 5mm QFN 16mm × 16mm BGA Power Good Support Max I2C w/o Clock Stretching Package 4mm × 5mm QFN 9mm × 9mm QFN ü 9mm × 9mm QFN 9mm × 9mm QFN 9mm × 9mm QFN For the latest information, see http://www.linear.com/products/Power_System_Management * Consult data sheet(s) for detailed specifications. † Not temperature compensated. Available on odd channels only. All other channel features are disabled. www.linear.com/pmbusmanagers n 1-800-4-LINEAR 0914A